Расширение крайней секции PE файла

Пример техники расширения крайней секции исполняемого файла. Демонстрируются следующие фитчи:
- Растягивание последней секции и внесение в неё данных из файла
- Пересчёт PE checksum (IMAGE_OPTIONAL_HEADER.Checksum)
- Сдвиг оверлея
- Поддержка PE и PE+(x64)

TODO:
- Выравнивание согласно  IMAGE_OPTIONAL_HEADER.FileAligment

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// -------------------------------------------------------------- // This is example, how to inject data to the last PE section, // supported PE and PE+(x64) // by JKornev <c> http://k0rnev.blogspot.com // -------------------------------------------------------------- #include <stdio.h> #include <Windows.h> #include <ImageHlp.h> #pragma comment(lib, "ImageHlp") UINT Aligment(UINT size, UINT aligm_base) { UINT new_size = size; if (size % aligm_base != 0) { new_size += aligm_base - (size % aligm_base); } return new_size; } void OutputSection(PIMAGE_SECTION_HEADER psect) { char name[IMAGE_SIZEOF_SHORT_NAME + 1] = {0}; memcpy(name, psect->Name, IMAGE_SIZEOF_SHORT_NAME); printf(" Name:%s\n" " Virual adress: 0x%08X\n" " Virual size: 0x%08X\n" " Raw adress: 0x%08X\n" " Raw size: 0x%08X\n" " Characteristics: 0x%08X\n", name, psect->VirtualAddress, psect->Misc.VirtualSize, psect->PointerToRawData, psect->SizeOfRawData, psect->Characteristics); } int main(int argc, char *argv[]) { enum { PE_DEFAULT_HEADER_SIZE = 0x400 };//usually PE header raw size is 0x400 char *phead, *pdata, *poverl; HANDLE hfile, hfile2, hmap; DWORD readed, written, offset, pe_size, data_size, overl_size, roffset, old_checksum, new_checksum; PIMAGE_DOS_HEADER pdos; PIMAGE_FILE_HEADER pimg; PIMAGE_SECTION_HEADER psect; PIMAGE_OPTIONAL_HEADER32 popt32; PIMAGE_OPTIONAL_HEADER64 popt64; PIMAGE_NT_HEADERS32 pnt32; PIMAGE_NT_HEADERS64 pnt64; BOOL is_x64, have_checksum; PVOID pview; if (argc < 3) { printf("Error, incorrect arguments!\n" "Format: inject.exe \"pe file name\" \"data file name\"\n"); return 1; } // Read PE header phead = (char *)malloc(PE_DEFAULT_HEADER_SIZE); if (!phead) { printf("Error, can't allocate buffer!\n"); return 1; } hfile = CreateFileA(argv[1], GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL); if (hfile == INVALID_HANDLE_VALUE) { printf("Error, can't open PE file '%s'!\n", argv[1]); return 1; } pe_size = GetFileSize(hfile, NULL); if (!ReadFile(hfile, phead, PE_DEFAULT_HEADER_SIZE, &readed, NULL)) { printf("Error, reading PE file failed!\n"); return 1; } // Check DOS header offset = 0; pdos = (PIMAGE_DOS_HEADER)phead; if (pdos->e_magic != IMAGE_DOS_SIGNATURE) { printf("Error, '%s' isn't PE file!\n", argv[1]); return 1; } offset = pdos->e_lfanew + sizeof(DWORD)/*PE signature*/; pimg = (PIMAGE_FILE_HEADER)(phead + offset); offset += sizeof(IMAGE_FILE_HEADER); // Check architecture if (pimg->Machine == IMAGE_FILE_MACHINE_I386) { is_x64 = FALSE; popt32 = (PIMAGE_OPTIONAL_HEADER32)(phead + offset); offset += sizeof(IMAGE_OPTIONAL_HEADER32); } else if (pimg->Machine == IMAGE_FILE_MACHINE_AMD64) { is_x64 = TRUE; popt64 = (PIMAGE_OPTIONAL_HEADER64)(phead + offset); offset += sizeof(IMAGE_OPTIONAL_HEADER64); } else { printf("Error, architecture not supported!\n"); return 1; } // Get pointer to the last section psect = (PIMAGE_SECTION_HEADER)(phead + offset); psect = &psect[pimg->NumberOfSections - 1]; if (!psect->SizeOfRawData) { //maybe this section contains uninitialized data printf("Error, can't resize last section!\n"); return 1; } printf("Resizable section, before:\n"); OutputSection(psect); // Unset 'discardable' flag if (psect->Characteristics & IMAGE_SCN_MEM_DISCARDABLE) { psect->Characteristics ^= IMAGE_SCN_MEM_DISCARDABLE; } // Read data hfile2 = CreateFileA(argv[2], GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL); if (hfile2 == INVALID_HANDLE_VALUE) { printf("Error, can't open data file '%s'!\n", argv[2]); return 1; } data_size = GetFileSize(hfile2, NULL); if (!data_size) { printf("Error, file '%s' is empty!\n", argv[2]); return 1; } pdata = (char *)malloc(data_size); if (!pdata) { printf("Error, can't allocate data buffer!\n"); return 1; } if (!ReadFile(hfile2, pdata, data_size, &readed, NULL)) { printf("Error, reading data file failed!\n"); return 1; } // Shift overlay roffset = psect->PointerToRawData + psect->SizeOfRawData;//raw(in file) offset to the end of last section data overl_size = pe_size - roffset;//calculate overlay size if (overl_size > 0) { poverl = (char *)malloc(overl_size); if (!poverl) { printf("Error, can't allocate temp buffer!\n"); return 1; } SetFilePointer(hfile, roffset, 0, FILE_BEGIN); if (!ReadFile(hfile, poverl, overl_size, &readed, NULL)) { printf("Error, reading overlay failed!\n"); return 1; } SetFilePointer(hfile, roffset + data_size, 0, FILE_BEGIN); if (!WriteFile(hfile, poverl, overl_size, &written, NULL)) { printf("Error, can't save overlay!\n"); return 1; } free(poverl); } // Put data SetFilePointer(hfile, roffset, 0, FILE_BEGIN); if (!WriteFile(hfile, pdata, data_size, &written, NULL)) { printf("Error, can't save new data!\n"); return 1; } // Change header info psect->SizeOfRawData += data_size; if (psect->SizeOfRawData > psect->Misc.VirtualSize) { if (is_x64) { //change size of image popt64->SizeOfImage += Aligment(psect->SizeOfRawData, popt64->SectionAlignment) - Aligment(psect->Misc.VirtualSize, popt64->SectionAlignment); //change section virtual size psect->Misc.VirtualSize = Aligment(psect->SizeOfRawData, popt64->SectionAlignment); } else { popt32->SizeOfImage += Aligment(psect->SizeOfRawData, popt32->SectionAlignment) - Aligment(psect->Misc.VirtualSize, popt32->SectionAlignment); psect->Misc.VirtualSize = Aligment(psect->SizeOfRawData, popt32->SectionAlignment); } } // Save header SetFilePointer(hfile, 0, 0, FILE_BEGIN); if (!WriteFile(hfile, phead, PE_DEFAULT_HEADER_SIZE, &written, NULL)) { printf("Error, can't save new header!\n"); return 1; } FlushFileBuffers(hfile); // Recalculate checksum (optional feature) if (is_x64) { have_checksum = (popt64->CheckSum ? TRUE : FALSE); } else { have_checksum = (popt32->CheckSum ? TRUE : FALSE); } if (have_checksum) { hmap = CreateFileMapping(hfile, NULL, PAGE_READWRITE, 0, 0, NULL); pview = MapViewOfFile(hmap, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0); if (pview) { if (is_x64) { if (pnt64 = (PIMAGE_NT_HEADERS64)CheckSumMappedFile(pview, pe_size + data_size, &old_checksum, &new_checksum)) { pnt64->OptionalHeader.CheckSum = new_checksum; } else { printf("Warning, can't recalc header checksum!\n"); } } else { if (pnt32 = (PIMAGE_NT_HEADERS32)CheckSumMappedFile(pview, pe_size + data_size, &old_checksum, &new_checksum)) { pnt32->OptionalHeader.CheckSum = new_checksum; } else { printf("Warning, can't recalc header checksum!\n"); } } UnmapViewOfFile(pview); } else { printf("Warning, can't recalc header checksum!\n"); } if (hmap) { CloseHandle(hmap); } } printf("\nResizable section, after:\n"); OutputSection(psect); printf("Operation successful\n"); free(pdata); free(phead); CloseHandle(hfile); CloseHandle(hfile2); return 0; }