299 lines
8.5 KiB
C
299 lines
8.5 KiB
C
/*
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Inject the DLL into the target process by modifying its import descriptor
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table. The target process must have been created suspended. However, for a
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64-bit system with a .NET AnyCPU process, inject via LdrLoadDll in ntdll.dll
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and CreateRemoteThread (since AnyCPU is stored as i386, but loads as AMD64,
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preventing imports from working).
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*/
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#include "ansicon.h"
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// Search for a suitable free area after the main image (32-bit code could
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// really go anywhere, but let's keep it relatively local.)
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static PVOID FindMem( HANDLE hProcess, PBYTE base, DWORD len )
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{
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MEMORY_BASIC_INFORMATION minfo;
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PBYTE ptr;
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PVOID mem;
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for (ptr = base;
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VirtualQueryEx( hProcess, ptr, &minfo, sizeof(minfo) );
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ptr += minfo.RegionSize)
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{
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if ((minfo.State & MEM_FREE) && minfo.RegionSize >= len)
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{
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#ifdef _WIN64
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if ((PBYTE)minfo.BaseAddress - base > 0xFfFfFfFf - len)
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return NULL;
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#endif
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mem = VirtualAllocEx( hProcess, (PVOID)
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(((DWORD_PTR)minfo.BaseAddress + 0xFFFF) & ~0xFFFF),
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len, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE );
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if (mem != NULL)
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return mem;
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}
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}
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return NULL;
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}
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void InjectDLL( LPPROCESS_INFORMATION ppi, PBYTE pBase )
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{
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DWORD rva;
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PVOID pMem;
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DWORD len;
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DWORD pr;
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IMAGE_DOS_HEADER DosHeader;
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IMAGE_NT_HEADERS NTHeader, *pNTHeader;
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PIMAGE_IMPORT_DESCRIPTOR pImports;
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IMAGE_COR20_HEADER ComHeader, *pComHeader;
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union
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{
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PBYTE pB;
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PLONG_PTR pL;
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PIMAGE_IMPORT_DESCRIPTOR pI;
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} ip;
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ReadProcVar( pBase, &DosHeader );
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pNTHeader = (PIMAGE_NT_HEADERS)(pBase + DosHeader.e_lfanew);
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ReadProcVar( pNTHeader, &NTHeader );
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len = 4 * PTRSZ + ansi_len + sizeof(*pImports) + NTHeader.IMPORTDIR.Size;
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pImports = malloc( len );
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if (pImports == NULL)
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{
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DEBUGSTR( 1, L" Failed to allocate memory." );
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return;
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}
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pMem = FindMem( ppi->hProcess, pBase, len );
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if (pMem == NULL)
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{
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DEBUGSTR( 1, L" Failed to allocate virtual memory." );
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free( pImports );
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return;
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}
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rva = (DWORD)((PBYTE)pMem - pBase);
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ip.pL = (PLONG_PTR)pImports;
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*ip.pL++ = IMAGE_ORDINAL_FLAG + 1;
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*ip.pL++ = 0;
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*ip.pL++ = IMAGE_ORDINAL_FLAG + 1;
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*ip.pL++ = 0;
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memcpy( ip.pB, ansi_dll, ansi_len );
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ip.pB += ansi_len;
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ip.pI->OriginalFirstThunk = rva + 2 * PTRSZ;
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ip.pI->TimeDateStamp = 0;
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ip.pI->ForwarderChain = 0;
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ip.pI->Name = rva + 4 * PTRSZ;
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ip.pI->FirstThunk = rva;
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ReadProcMem( pBase + NTHeader.IMPORTDIR.VirtualAddress,
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ip.pI + 1, NTHeader.IMPORTDIR.Size );
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WriteProcMem( pMem, pImports, len );
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free( pImports );
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// If there's no IAT, copy the original IDT (to allow writable ".idata").
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if (NTHeader.IATDIR.VirtualAddress == 0)
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NTHeader.IATDIR = NTHeader.IMPORTDIR;
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NTHeader.IMPORTDIR.VirtualAddress = rva + 4 * PTRSZ + ansi_len;
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NTHeader.IMPORTDIR.Size += sizeof(*pImports);
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// Remove bound imports, so the updated import table is used.
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NTHeader.BOUNDDIR.VirtualAddress = 0;
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NTHeader.BOUNDDIR.Size = 0;
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VirtProtVar( pNTHeader, PAGE_READWRITE );
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WriteProcVar( pNTHeader, &NTHeader );
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VirtProtVar( pNTHeader, pr );
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// Remove the IL-only flag on a managed process.
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if (NTHeader.COMDIR.VirtualAddress != 0 && NTHeader.COMDIR.Size != 0)
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{
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pComHeader = (PIMAGE_COR20_HEADER)(pBase + NTHeader.COMDIR.VirtualAddress);
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ReadProcVar( pComHeader, &ComHeader );
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if (ComHeader.Flags & COMIMAGE_FLAGS_ILONLY)
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{
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ComHeader.Flags &= ~COMIMAGE_FLAGS_ILONLY;
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VirtProtVar( pComHeader, PAGE_READWRITE );
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WriteProcVar( pComHeader, &ComHeader );
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VirtProtVar( pComHeader, pr );
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}
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}
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}
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#ifdef _WIN64
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void InjectDLL32( LPPROCESS_INFORMATION ppi, PBYTE pBase )
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{
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DWORD rva;
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PVOID pMem;
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DWORD len;
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DWORD pr;
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IMAGE_DOS_HEADER DosHeader;
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IMAGE_NT_HEADERS32 NTHeader, *pNTHeader;
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PIMAGE_IMPORT_DESCRIPTOR pImports;
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IMAGE_COR20_HEADER ComHeader, *pComHeader;
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union
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{
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PBYTE pB;
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PLONG pL;
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PIMAGE_IMPORT_DESCRIPTOR pI;
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} ip;
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ReadProcVar( pBase, &DosHeader );
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pNTHeader = (PIMAGE_NT_HEADERS32)(pBase + DosHeader.e_lfanew);
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ReadProcVar( pNTHeader, &NTHeader );
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len = 16 + ansi_len + sizeof(*pImports) + NTHeader.IMPORTDIR.Size;
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pImports = malloc( len );
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if (pImports == NULL)
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{
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DEBUGSTR( 1, L" Failed to allocate memory." );
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return;
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}
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pMem = FindMem( ppi->hProcess, pBase, len );
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if (pMem == NULL)
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{
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DEBUGSTR( 1, L" Failed to allocate virtual memory." );
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free( pImports );
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return;
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}
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rva = (DWORD)((PBYTE)pMem - pBase);
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ip.pL = (PLONG)pImports;
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*ip.pL++ = IMAGE_ORDINAL_FLAG32 + 1;
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*ip.pL++ = 0;
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*ip.pL++ = IMAGE_ORDINAL_FLAG32 + 1;
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*ip.pL++ = 0;
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memcpy( ip.pB, ansi_dll, ansi_len );
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ip.pB += ansi_len;
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ip.pI->OriginalFirstThunk = rva + 8;
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ip.pI->TimeDateStamp = 0;
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ip.pI->ForwarderChain = 0;
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ip.pI->Name = rva + 16;
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ip.pI->FirstThunk = rva;
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ReadProcMem( pBase + NTHeader.IMPORTDIR.VirtualAddress,
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ip.pI + 1, NTHeader.IMPORTDIR.Size );
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WriteProcMem( pMem, pImports, len );
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free( pImports );
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if (NTHeader.IATDIR.VirtualAddress == 0)
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NTHeader.IATDIR = NTHeader.IMPORTDIR;
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NTHeader.IMPORTDIR.VirtualAddress = rva + 16 + ansi_len;
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NTHeader.IMPORTDIR.Size += sizeof(*pImports);
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NTHeader.BOUNDDIR.VirtualAddress = 0;
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NTHeader.BOUNDDIR.Size = 0;
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VirtProtVar( pNTHeader, PAGE_READWRITE );
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WriteProcVar( pNTHeader, &NTHeader );
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VirtProtVar( pNTHeader, pr );
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if (NTHeader.COMDIR.VirtualAddress != 0 && NTHeader.COMDIR.Size != 0)
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{
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pComHeader = (PIMAGE_COR20_HEADER)(pBase + NTHeader.COMDIR.VirtualAddress);
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ReadProcVar( pComHeader, &ComHeader );
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if (ComHeader.Flags & COMIMAGE_FLAGS_ILONLY)
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{
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ComHeader.Flags &= ~COMIMAGE_FLAGS_ILONLY;
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VirtProtVar( pComHeader, PAGE_READWRITE );
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WriteProcVar( pComHeader, &ComHeader );
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VirtProtVar( pComHeader, pr );
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}
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}
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}
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/*
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Locate the base address of 64-bit ntdll.dll. This is supposedly really at
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the same address for every process, but let's find it anyway. A newly-
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created suspended 64-bit process has two images in memory: the process itself
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and ntdll.dll - the one that is a DLL must be ntdll.dll. (A 32-bit WOW64
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process has three images - the process and both 64- & 32-bit ntdll.dll).
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*/
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static PBYTE get_ntdll( LPPROCESS_INFORMATION ppi )
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{
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PBYTE ptr;
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MEMORY_BASIC_INFORMATION minfo;
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IMAGE_DOS_HEADER dos_header;
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IMAGE_NT_HEADERS nt_header;
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for (ptr = NULL;
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VirtualQueryEx( ppi->hProcess, ptr, &minfo, sizeof(minfo) );
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ptr += minfo.RegionSize)
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{
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if (minfo.BaseAddress == minfo.AllocationBase
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&& ReadProcVar( minfo.BaseAddress, &dos_header )
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&& dos_header.e_magic == IMAGE_DOS_SIGNATURE
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&& ReadProcVar( (PBYTE)minfo.BaseAddress + dos_header.e_lfanew,
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&nt_header )
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&& nt_header.Signature == IMAGE_NT_SIGNATURE
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&& (nt_header.FileHeader.Characteristics & IMAGE_FILE_DLL))
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{
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return minfo.BaseAddress;
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}
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}
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DEBUGSTR( 1, L" Failed to find ntdll.dll!" );
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return NULL;
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}
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void InjectDLL64( LPPROCESS_INFORMATION ppi )
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{
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PBYTE ntdll;
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DWORD rLdrLoadDll;
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PBYTE pMem;
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DWORD len;
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HANDLE thread;
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BYTE code[64];
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union
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{
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PBYTE pB;
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PUSHORT pS;
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PDWORD pD;
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PBYTE* pL;
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} ip;
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ntdll = get_ntdll( ppi );
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if (ntdll == NULL)
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return;
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rLdrLoadDll = GetProcRVA( L"ntdll.dll", "LdrLoadDll", 64 );
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if (rLdrLoadDll == 0)
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return;
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pMem = VirtualAllocEx( ppi->hProcess, NULL, 4096, MEM_COMMIT,
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PAGE_EXECUTE_READ );
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if (pMem == NULL)
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{
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DEBUGSTR( 1, L" Failed to allocate virtual memory (%lu)", GetLastError() );
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return;
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}
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len = (DWORD)TSIZE(wcslen( DllName ) + 1);
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ip.pB = code;
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*ip.pL++ = ntdll + rLdrLoadDll; // address of LdrLoadDll
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*ip.pD++ = 0x38ec8348; // sub rsp, 0x38
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*ip.pD++ = 0x244c8d4c; // lea r9, [rsp+0x20]
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*ip.pD++ = 0x058d4c20; // lea r8, L"path\to\ANSI64.dll"
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*ip.pD++ = 16; // xor edx, edx
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*ip.pD++ = 0xc933d233; // xor ecx, ecx
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*ip.pS++ = 0x15ff; // call LdrLoadDll
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*ip.pD++ = -34; // add rsp, 0x38
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*ip.pD++ = 0x38c48348; // ret
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*ip.pS++ = 0x00c3; // alignment for the name
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*ip.pS++ = (USHORT)(len - TSIZE(1)); // UNICODE_STRING.Length
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*ip.pS++ = (USHORT)len; // UNICODE_STRING.MaximumLength
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*ip.pD++ = 0; // padding
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*ip.pL++ = pMem + 56; // UNICODE_STRING.Buffer
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WriteProcMem( pMem, code, ip.pB - code );
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WriteProcMem( pMem + (ip.pB - code), DllName, len );
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thread = CreateRemoteThread( ppi->hProcess, NULL, 4096,
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(LPTHREAD_START_ROUTINE)(pMem + 8), NULL, 0, NULL );
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WaitForSingleObject( thread, INFINITE );
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CloseHandle( thread );
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VirtualFreeEx( ppi->hProcess, pMem, 0, MEM_RELEASE );
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}
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#endif
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