mirror of
https://github.com/monoxgas/sRDI
synced 2026-06-06 16:14:36 +00:00
Nick Landers
425 lines
28 KiB
C++
425 lines
28 KiB
C++
// RDIShellcodeCLoader.cpp : Defines the entry point for the console application.
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//
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#include "stdafx.h"
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#include <windows.h>
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#include <string>
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#define DEREF_64( name )*(DWORD64 *)(name)
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#define DEREF_32( name )*(DWORD *)(name)
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#define DEREF_16( name )*(WORD *)(name)
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#define DEREF_8( name )*(BYTE *)(name)
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#define ROTR32(value, shift) (((DWORD) value >> (BYTE) shift) | ((DWORD) value << (32 - (BYTE) shift)))
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#define SRDI_CLEARHEADER 0x1
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FARPROC GetProcAddressR(UINT_PTR uiLibraryAddress, LPCSTR lpProcName)
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{
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FARPROC fpResult = NULL;
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if (uiLibraryAddress == NULL)
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return NULL;
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UINT_PTR uiAddressArray = 0;
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UINT_PTR uiNameArray = 0;
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UINT_PTR uiNameOrdinals = 0;
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PIMAGE_NT_HEADERS pNtHeaders = NULL;
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PIMAGE_DATA_DIRECTORY pDataDirectory = NULL;
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PIMAGE_EXPORT_DIRECTORY pExportDirectory = NULL;
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// get the VA of the modules NT Header
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pNtHeaders = (PIMAGE_NT_HEADERS)(uiLibraryAddress + ((PIMAGE_DOS_HEADER)uiLibraryAddress)->e_lfanew);
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pDataDirectory = (PIMAGE_DATA_DIRECTORY)&pNtHeaders->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT];
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// get the VA of the export directory
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pExportDirectory = (PIMAGE_EXPORT_DIRECTORY)(uiLibraryAddress + pDataDirectory->VirtualAddress);
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// get the VA for the array of addresses
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uiAddressArray = (uiLibraryAddress + pExportDirectory->AddressOfFunctions);
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// get the VA for the array of name pointers
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uiNameArray = (uiLibraryAddress + pExportDirectory->AddressOfNames);
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// get the VA for the array of name ordinals
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uiNameOrdinals = (uiLibraryAddress + pExportDirectory->AddressOfNameOrdinals);
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// test if we are importing by name or by ordinal...
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if (((DWORD)lpProcName & 0xFFFF0000) == 0x00000000)
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{
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// import by ordinal...
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// use the import ordinal (- export ordinal base) as an index into the array of addresses
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uiAddressArray += ((IMAGE_ORDINAL((DWORD)lpProcName) - pExportDirectory->Base) * sizeof(DWORD));
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// resolve the address for this imported function
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fpResult = (FARPROC)(uiLibraryAddress + DEREF_32(uiAddressArray));
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}
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else
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{
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// import by name...
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DWORD dwCounter = pExportDirectory->NumberOfNames;
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while (dwCounter--)
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{
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char * cpExportedFunctionName = (char *)(uiLibraryAddress + DEREF_32(uiNameArray));
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// test if we have a match...
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if (strcmp(cpExportedFunctionName, lpProcName) == 0)
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{
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// use the functions name ordinal as an index into the array of name pointers
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uiAddressArray += (DEREF_16(uiNameOrdinals) * sizeof(DWORD));
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// calculate the virtual address for the function
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fpResult = (FARPROC)(uiLibraryAddress + DEREF_32(uiAddressArray));
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// finish...
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break;
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}
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// get the next exported function name
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uiNameArray += sizeof(DWORD);
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// get the next exported function name ordinal
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uiNameOrdinals += sizeof(WORD);
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}
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}
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return fpResult;
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}
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BOOL Is64BitDLL(UINT_PTR uiLibraryAddress)
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{
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PIMAGE_NT_HEADERS pNtHeaders = (PIMAGE_NT_HEADERS)(uiLibraryAddress + ((PIMAGE_DOS_HEADER)uiLibraryAddress)->e_lfanew);
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if (pNtHeaders->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) return true;
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else return false;
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}
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DWORD GetFileContents(LPCSTR filename, LPSTR *data, DWORD &size)
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{
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std::FILE *fp = std::fopen(filename, "rb");
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if (fp)
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{
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fseek(fp, 0, SEEK_END);
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size = ftell(fp);
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fseek(fp, 0, SEEK_SET);
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*data = (LPSTR)malloc(size + 1);
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fread(*data, size, 1, fp);
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fclose(fp);
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return true;
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}
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return false;
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}
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DWORD HashFunctionName(LPSTR name) {
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DWORD hash = 0;
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do
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{
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hash = ROTR32(hash, 13);
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hash += *name;
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name++;
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} while (*(name - 1) != 0);
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return hash;
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}
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BOOL ConvertToShellcode(LPVOID inBytes, DWORD length, DWORD userFunction, LPVOID userData, DWORD userLength, DWORD flags, LPSTR &outBytes, DWORD &outLength)
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{
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LPSTR rdiShellcode = NULL;
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DWORD rdiShellcodeLength, dllOffset, userDataLocation;
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#ifdef _DEBUG
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LPSTR rdiShellcode64 = NULL, rdiShellcode32 = NULL;
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DWORD rdiShellcode64Length = 0, rdiShellcode32Length = 0;
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GetFileContents("../bin/ShellcodeRDI_x64.bin", &rdiShellcode64, rdiShellcode64Length);
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GetFileContents("../bin/ShellcodeRDI_x86.bin", &rdiShellcode32, rdiShellcode32Length);
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#else
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//MARKER:S
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LPSTR rdiShellcode32 = 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|
|
LPSTR rdiShellcode64 = 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|
|
DWORD rdiShellcode32Length = 2049, rdiShellcode64Length = 2128;
|
|
//MARKER:E
|
|
#endif
|
|
|
|
if (Is64BitDLL((UINT_PTR)inBytes))
|
|
{
|
|
|
|
rdiShellcode = rdiShellcode64;
|
|
rdiShellcodeLength = rdiShellcode64Length;
|
|
|
|
if (rdiShellcode == NULL || rdiShellcodeLength == 0) return 0;
|
|
|
|
BYTE bootstrap[64] = { 0 };
|
|
DWORD i = 0;
|
|
|
|
// call next instruction (Pushes next instruction address to stack)
|
|
bootstrap[i++] = 0xe8;
|
|
bootstrap[i++] = 0x00;
|
|
bootstrap[i++] = 0x00;
|
|
bootstrap[i++] = 0x00;
|
|
bootstrap[i++] = 0x00;
|
|
|
|
// Set the offset to our DLL from pop result
|
|
dllOffset = sizeof(bootstrap) - i + rdiShellcodeLength;
|
|
|
|
// pop rcx - Capture our current location in memory
|
|
bootstrap[i++] = 0x59;
|
|
|
|
// mov r8, rcx - copy our location in memory to r8 before we start modifying RCX
|
|
bootstrap[i++] = 0x49;
|
|
bootstrap[i++] = 0x89;
|
|
bootstrap[i++] = 0xc8;
|
|
|
|
// add rcx, <Offset of the DLL>
|
|
bootstrap[i++] = 0x48;
|
|
bootstrap[i++] = 0x81;
|
|
bootstrap[i++] = 0xc1;
|
|
MoveMemory(bootstrap + i, &dllOffset, sizeof(dllOffset));
|
|
i += sizeof(dllOffset);
|
|
|
|
// mov edx, <hash of function>
|
|
bootstrap[i++] = 0xba;
|
|
MoveMemory(bootstrap + i, &userFunction, sizeof(userFunction));
|
|
i += sizeof(userFunction);
|
|
|
|
// Setup the location of our user data
|
|
// add r8, <Offset of the DLL> + <Length of DLL>
|
|
bootstrap[i++] = 0x49;
|
|
bootstrap[i++] = 0x81;
|
|
bootstrap[i++] = 0xc0;
|
|
userDataLocation = dllOffset + length;
|
|
MoveMemory(bootstrap + i, &userDataLocation, sizeof(userDataLocation));
|
|
i += sizeof(userDataLocation);
|
|
|
|
// mov r9d, <Length of User Data>
|
|
bootstrap[i++] = 0x41;
|
|
bootstrap[i++] = 0xb9;
|
|
MoveMemory(bootstrap + i, &userLength, sizeof(userLength));
|
|
i += sizeof(userLength);
|
|
|
|
// push rsi - save original value
|
|
bootstrap[i++] = 0x56;
|
|
|
|
// mov rsi, rsp - store our current stack pointer for later
|
|
bootstrap[i++] = 0x48;
|
|
bootstrap[i++] = 0x89;
|
|
bootstrap[i++] = 0xe6;
|
|
|
|
// and rsp, 0x0FFFFFFFFFFFFFFF0 - Align the stack to 16 bytes
|
|
bootstrap[i++] = 0x48;
|
|
bootstrap[i++] = 0x83;
|
|
bootstrap[i++] = 0xe4;
|
|
bootstrap[i++] = 0xf0;
|
|
|
|
// sub rsp, 0x30 - Create some breathing room on the stack
|
|
bootstrap[i++] = 0x48;
|
|
bootstrap[i++] = 0x83;
|
|
bootstrap[i++] = 0xec;
|
|
bootstrap[i++] = 6 * 8; // 32 bytes for shadow space + 8 bytes for last arg + 8 bytes for stack alignment
|
|
|
|
// mov dword ptr [rsp + 0x20], <Flags> - Push arg 5 just above shadow space
|
|
bootstrap[i++] = 0xC7;
|
|
bootstrap[i++] = 0x44;
|
|
bootstrap[i++] = 0x24;
|
|
bootstrap[i++] = 4 * 8;
|
|
MoveMemory(bootstrap + i, &flags, sizeof(flags));
|
|
i += sizeof(flags);
|
|
|
|
// call - Transfer execution to the RDI
|
|
bootstrap[i++] = 0xe8;
|
|
bootstrap[i++] = sizeof(bootstrap) - i - 4; // Skip over the remainder of instructions
|
|
bootstrap[i++] = 0x00;
|
|
bootstrap[i++] = 0x00;
|
|
bootstrap[i++] = 0x00;
|
|
|
|
// mov rsp, rsi - Reset our original stack pointer
|
|
bootstrap[i++] = 0x48;
|
|
bootstrap[i++] = 0x89;
|
|
bootstrap[i++] = 0xf4;
|
|
|
|
// pop rsi - Put things back where we left them
|
|
bootstrap[i++] = 0x5e;
|
|
|
|
// ret - return to caller
|
|
bootstrap[i++] = 0xc3;
|
|
|
|
// Ends up looking like this in memory:
|
|
// Bootstrap shellcode
|
|
// RDI shellcode
|
|
// DLL bytes
|
|
// User data
|
|
outLength = length + userLength + rdiShellcodeLength + sizeof(bootstrap);
|
|
outBytes = (LPSTR)malloc(outLength);
|
|
MoveMemory(outBytes, bootstrap, sizeof(bootstrap));
|
|
MoveMemory(outBytes + sizeof(bootstrap), rdiShellcode, rdiShellcodeLength);
|
|
MoveMemory(outBytes + sizeof(bootstrap) + rdiShellcodeLength, inBytes, length);
|
|
MoveMemory(outBytes + sizeof(bootstrap) + rdiShellcodeLength + length, userData, userLength);
|
|
|
|
}
|
|
else { // 32 bit
|
|
|
|
rdiShellcode = rdiShellcode32;
|
|
rdiShellcodeLength = rdiShellcode32Length;
|
|
|
|
if (rdiShellcode == NULL || rdiShellcodeLength == 0) return 0;
|
|
|
|
BYTE bootstrap[46] = { 0 };
|
|
DWORD i = 0;
|
|
|
|
// call next instruction (Pushes next instruction address to stack)
|
|
bootstrap[i++] = 0xe8;
|
|
bootstrap[i++] = 0x00;
|
|
bootstrap[i++] = 0x00;
|
|
bootstrap[i++] = 0x00;
|
|
bootstrap[i++] = 0x00;
|
|
|
|
// Set the offset to our DLL from pop result
|
|
dllOffset = sizeof(bootstrap) - i + rdiShellcodeLength;
|
|
|
|
// pop eax - Capture our current location in memory
|
|
bootstrap[i++] = 0x58;
|
|
|
|
// push ebp
|
|
bootstrap[i++] = 0x55;
|
|
|
|
// move ebp, esp
|
|
bootstrap[i++] = 0x89;
|
|
bootstrap[i++] = 0xe5;
|
|
|
|
// mov ebx, eax - copy our location in memory to ebx before we start modifying eax
|
|
bootstrap[i++] = 0x89;
|
|
bootstrap[i++] = 0xc3;
|
|
|
|
// add eax, <Offset to the DLL>
|
|
bootstrap[i++] = 0x05;
|
|
MoveMemory(bootstrap + i, &dllOffset, sizeof(dllOffset));
|
|
i += sizeof(dllOffset);
|
|
|
|
// add ebx, <Offset to the DLL> + <Size of DLL>
|
|
bootstrap[i++] = 0x81;
|
|
bootstrap[i++] = 0xc3;
|
|
userDataLocation = dllOffset + length;
|
|
MoveMemory(bootstrap + i, &userDataLocation, sizeof(userDataLocation));
|
|
i += sizeof(userDataLocation);
|
|
|
|
// push <Flags>
|
|
bootstrap[i++] = 0x68;
|
|
MoveMemory(bootstrap + i, &flags, sizeof(flags));
|
|
i += sizeof(flags);
|
|
|
|
// push <Length of User Data>
|
|
bootstrap[i++] = 0x68;
|
|
MoveMemory(bootstrap + i, &userLength, sizeof(userLength));
|
|
i += sizeof(userLength);
|
|
|
|
// push ebx
|
|
bootstrap[i++] = 0x53;
|
|
|
|
// push <hash of function>
|
|
bootstrap[i++] = 0x68;
|
|
MoveMemory(bootstrap + i, &userFunction, sizeof(userFunction));
|
|
i += sizeof(userFunction);
|
|
|
|
// push eax
|
|
bootstrap[i++] = 0x50;
|
|
|
|
// call - Transfer execution to the RDI
|
|
bootstrap[i++] = 0xe8;
|
|
bootstrap[i++] = sizeof(bootstrap) - i - 4; // Skip the remainder of instructions
|
|
bootstrap[i++] = 0x00;
|
|
bootstrap[i++] = 0x00;
|
|
bootstrap[i++] = 0x00;
|
|
|
|
// add esp, 0x14 - correct the stack pointer
|
|
//bootstrap[i++] = 0x83;
|
|
//bootstrap[i++] = 0xc4;
|
|
//bootstrap[i++] = 0x14;
|
|
|
|
// leave
|
|
bootstrap[i++] = 0xc9;
|
|
|
|
// ret - return to caller
|
|
bootstrap[i++] = 0xc3;
|
|
|
|
// Ends up looking like this in memory:
|
|
// Bootstrap shellcode
|
|
// RDI shellcode
|
|
// DLL bytes
|
|
// User data
|
|
outLength = length + userLength + rdiShellcodeLength + sizeof(bootstrap);
|
|
outBytes = (LPSTR)malloc(outLength);
|
|
MoveMemory(outBytes, bootstrap, sizeof(bootstrap));
|
|
MoveMemory(outBytes + sizeof(bootstrap), rdiShellcode, rdiShellcodeLength);
|
|
MoveMemory(outBytes + sizeof(bootstrap) + rdiShellcodeLength, inBytes, length);
|
|
MoveMemory(outBytes + sizeof(bootstrap) + rdiShellcodeLength + length, userData, userLength);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
typedef UINT_PTR(WINAPI * RDI)();
|
|
typedef void(WINAPI * Function)();
|
|
typedef BOOL(__cdecl * EXPORTEDFUNCTION)(LPVOID, DWORD);
|
|
|
|
int main(int argc, char *argv[], char *envp[])
|
|
{
|
|
LPSTR finalShellcode = NULL, data = NULL;
|
|
DWORD finalSize, dataSize;
|
|
DWORD dwOldProtect1 = 0;
|
|
SYSTEM_INFO sysInfo;
|
|
|
|
// For any MessageBox testing in the blob
|
|
HMODULE test = LoadLibraryA("User32.dll");
|
|
|
|
if (argc < 2) {
|
|
printf("\n[!] Usage:\n\n\tNativeLoader.exe <DLL File>\n\tNativeLoader.exe <Shellcode Bin>\n");
|
|
return 0;
|
|
}
|
|
if (!GetFileContents(argv[1], &data, dataSize)) {
|
|
printf("\n[!] Failed to load file\n");
|
|
return 0;
|
|
}
|
|
|
|
if (data[0] == 'M' && data[1] == 'Z') {
|
|
printf("[+] File is a DLL, attempting to convert\n");
|
|
|
|
if (!ConvertToShellcode(data, dataSize, HashFunctionName("SayHello"), "dave", 5, SRDI_CLEARHEADER, finalShellcode, finalSize)) {
|
|
printf("[!] Failed to convert DLL\n");
|
|
return 0;
|
|
}
|
|
|
|
printf("[+] Successfully Converted\n");
|
|
}
|
|
else {
|
|
finalShellcode = data;
|
|
finalSize = dataSize;
|
|
}
|
|
|
|
GetNativeSystemInfo(&sysInfo);
|
|
|
|
// Only set the first page to RWX
|
|
// This is should sufficiently cover the sRDI shellcode up top
|
|
if (VirtualProtect(finalShellcode, sysInfo.dwPageSize, PAGE_EXECUTE_READWRITE, &dwOldProtect1)) {
|
|
RDI rdi = (RDI)(finalShellcode);
|
|
|
|
printf("[+] Executing RDI\n");
|
|
UINT_PTR hLoadedDLL = rdi(); // Excute DLL
|
|
|
|
free(finalShellcode); // Free the RDI blob. We no longer need it.
|
|
|
|
Function exportedFunction = (Function)GetProcAddressR(hLoadedDLL, "SayGoodbye");
|
|
if (exportedFunction) {
|
|
printf("[+] Calling exported functon\n");
|
|
exportedFunction();
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|