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November 10, 2012 01:01
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -3,6 +3,8 @@ #include <cstring> #include <windows.h> using namespace std; char image[0x800]; int main() -
7shi created this gist
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,111 @@ #include <cstdio> #include <cstdlib> #include <cstring> #include <windows.h> char image[0x800]; int main() { auto dosh = reinterpret_cast<IMAGE_DOS_HEADER*>(&image[0]); dosh->e_magic = *(WORD*)"MZ"; dosh->e_cblp = 0x90; dosh->e_cp = 3; dosh->e_cparhdr = 4; dosh->e_maxalloc = 0xffff; dosh->e_sp = 0xb8; dosh->e_lfarlc = 0x40; dosh->e_lfanew = 0x80; BYTE stub[] = { 0xb8, 0x01, 0x4c, 0xcd, 0x21 }; memcpy(&image[0x40], stub, sizeof(stub)); auto peh = reinterpret_cast<IMAGE_NT_HEADERS32*>(&image[0x80]); peh->Signature = *(DWORD*)"PE\0\0"; auto fh = &peh->FileHeader; fh->Machine = 0x14c; fh->NumberOfSections = 3; fh->SizeOfOptionalHeader = 0xe0; fh->Characteristics = 0x102; auto oph = &peh->OptionalHeader; oph->Magic = 0x10b; oph->MajorLinkerVersion = 10; oph->SizeOfCode = 0x200; oph->AddressOfEntryPoint = 0x1000; oph->BaseOfCode = 0x1000; oph->BaseOfData = 0x2000; oph->ImageBase = 0x400000; oph->SectionAlignment = 0x1000; oph->FileAlignment = 0x200; oph->MajorOperatingSystemVersion = 5; oph->MinorOperatingSystemVersion = 1; oph->MajorSubsystemVersion = 5; oph->MinorSubsystemVersion = 1; oph->SizeOfImage = 0x4000; oph->SizeOfHeaders = 0x200; oph->Subsystem = 3; oph->SizeOfStackReserve = 0x100000; oph->SizeOfStackCommit = 0x1000; oph->SizeOfHeapReserve = 0x100000; oph->SizeOfHeapCommit = 0x1000; oph->NumberOfRvaAndSizes = 16; oph->DataDirectory[1].VirtualAddress = 0x00002000; oph->DataDirectory[1].Size = 0x00001000; auto scth = reinterpret_cast<IMAGE_SECTION_HEADER*>(&image[0x178]); memcpy(scth[0].Name, ".text", 5); scth[0].Misc.VirtualSize = 15; scth[0].VirtualAddress = 0x1000; scth[0].SizeOfRawData = 0x200; scth[0].PointerToRawData = 0x200; scth[0].Characteristics = 0x60000020; memcpy(scth[1].Name, ".idata", 6); scth[1].Misc.VirtualSize = 0x54; scth[1].VirtualAddress = 0x2000; scth[1].SizeOfRawData = 0x200; scth[1].PointerToRawData = 0x400; scth[1].Characteristics = 0xc0300040; memcpy(scth[2].Name, ".data", 5); scth[2].Misc.VirtualSize = 7; scth[2].VirtualAddress = 0x3000; scth[2].SizeOfRawData = 0x200; scth[2].PointerToRawData = 0x600; scth[2].Characteristics = 0xc0000040; // .idata auto ilt = reinterpret_cast<IMAGE_IMPORT_DESCRIPTOR*>(&image[0x400]); ilt[0].OriginalFirstThunk = 0x2028; ilt[0].Name = 0x2048; ilt[0].FirstThunk = 0x2030; *(DWORD*)&image[0x428] = 0x2038; *(DWORD*)&image[0x430] = 0x2038; strcpy(&image[0x43a], "printf"); strcpy(&image[0x448], "msvcrt.dll"); // .text // push 0x00403000 image[0x200] = 0x68; *(DWORD*)&image[0x201] = 0x00403000; // call [0x00402030] image[0x205] = 0xff; image[0x206] = 0x15; *(DWORD*)&image[0x207] = 0x00402030; // add esp, 4 image[0x20b] = 0x83; image[0x20c] = 0xc4; image[0x20d] = 4; // ret image[0x20e] = 0xc3; // .data strcpy(&image[0x600], "hello\n"); auto f = fopen("output.exe", "wb"); if (!f) return 1; fwrite(image, 1, sizeof(image), f); fclose(f); }