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[转载图文] 反射式DLL注入实现（ManualMap，手动解析PE并映射到目标进程...

发表于 2022-5-9 00:56:48 | 查看: 3476| 回复: 1

一般而言要注入DLL到一个目标进程最简单的方法就是先获取DLL文件路径，然后在目标进程分配内存空间将路径写入到目标进程，写入到目标进程后再调用CreateRemoteThread()/NtCreateThread()/RtlCreateUserThread()函数来运行LoadLibraryA/W函数调用自己的DLL，这种方法的缺陷也很明显那就是容易被游戏检测到，很容易被游戏拦截，比如CSGO最新版就已经有这个限制了。

想要突破CSGO的限制注入DLL进去，我们可以采用反射式注入的方法（也可以先恢复CSGOhook的api进行远程线程注入），那么什么是反射式注入呢？又有什么有点呢？
反射式dll注入与常规dll注入类似，而不同的地方在于反射式dll注入技术自己实现了一个reflective loader()函数来代替LoadLibaryA()函数去加载dll，示意图如下图所示。蓝色的线表示与用常规dll注入相同的步骤，红框中的是reflective loader()函数行为，也是下面重点描述的地方。

Reflective loader实现思路如下：

1.获得被注入进程未解析的dll的基地址。
2.获得必要的dll句柄和函数为修复导入表做准备。
3.分配一块新内存去取解析dll，并把pe头复制到新内存中和将各节复制到新内存中。
4.修复导入表和重定向表。
5.执行DllMain()函数。

反射式DLL注入实现（ManualMap，手动解析PE并映射到目标进程...

核心代码如下：
ManualMapInject.h

#pragma once
#include "Injector.h"

using f_LoadLibraryA = HINSTANCE(WINAPI*)(const char* lpLibFilename);
using f_GetProcAddress = FARPROC(WINAPI*)(HMODULE hModule, LPCSTR lpProcName);
using f_DLL_ENTRY_POINT = BOOL(WINAPI*)(void* hDll, DWORD dwReason, void* pReserved);

#ifdef _WIN64
using f_RtlAddFunctionTable = BOOL(WINAPIV*)(PRUNTIME_FUNCTION FunctionTable, DWORD EntryCount, DWORD64 BaseAddress);
#endif

struct MANUAL_MAPPING_DATA
{
f_LoadLibraryA pLoadLibraryA;
f_GetProcAddress pGetProcAddress;
#ifdef _WIN64
f_RtlAddFunctionTable pRtlAddFunctionTable;
#endif
BYTE* pbase;
HINSTANCE hMod;
DWORD fdwReasonParam;
LPVOID reservedParam;
BOOL SEHSupport;
};

//Note: Exception support only x64 with build params /EHa or /EHc
bool ManualMapDll(HANDLE hProc, BYTE* pSrcData, SIZE_T FileSize, bool ClearHeader = true, bool ClearNonNeededSections = true, bool AdjustProtections = true, bool SEHExceptionSupport = true, DWORD fdwReason = DLL_PROCESS_ATTACH, LPVOID lpReserved = 0);
void __stdcall Shellcode(MANUAL_MAPPING_DATA* pData);

class CManualMapInject :public CInjector
{
public:
CManualMapInject();
virtual ~CManualMapInject();
virtual bool InjectorDLL(TCHAR* szPath,DWORD dwPid);
};

ManualMapInject.cpp

#include "pch.h"
#include "ManualMapInject.h"

#ifdef _WIN64
#define CURRENT_ARCH IMAGE_FILE_MACHINE_AMD64
#else
#define CURRENT_ARCH IMAGE_FILE_MACHINE_I386
#endif
#define RELOC_FLAG32(RelInfo) ((RelInfo >> 0x0C) == IMAGE_REL_BASED_HIGHLOW)
#define RELOC_FLAG64(RelInfo) ((RelInfo >> 0x0C) == IMAGE_REL_BASED_DIR64)

#ifdef _WIN64
#define RELOC_FLAG RELOC_FLAG64
#else
#define RELOC_FLAG RELOC_FLAG32
#endif

CManualMapInject::CManualMapInject()
{
}

CManualMapInject::~CManualMapInject()
{
}

bool CManualMapInject::InjectorDLL(TCHAR* szPath, DWORD dwPid)
{
HANDLE hProc = GetProcessHandle(dwPid);
if (!hProc || !IsCorrectTargetArchitecture(hProc) || GetFileAttributes(szPath) == INVALID_FILE_ATTRIBUTES)
{
      return false;
}

//    std::ifstream File(szPath, std::ios::binary | std::ios::ate);
//
//    if (File.fail())
//    {
//       printf("Opening the file failed: %X", (DWORD)File.rdstate());
//       File.close();
//       CloseHandle(hProc);
//       system("PAUSE");
//       return -5;
//    }
//
//    auto FileSize = File.tellg();
//    if (FileSize < 0x1000)
//    {
//       printf("Filesize invalid.");
//       File.close();
//       CloseHandle(hProc);
//       system("PAUSE");
//       return -6;
//    }
//
//    BYTE* pSrcData = new BYTE[(UINT_PTR)FileSize];
//    if (!pSrcData)
//    {
//       printf("Can't allocate dll file.");
//       File.close();
//       CloseHandle(hProc);
//       system("PAUSE");
//       return -7;
//    }
//
//    File.seekg(0, std::ios::beg);
//    File.read((char*)(pSrcData), FileSize);
//    File.close();
CFile file;
file.Open(szPath, CFile::modeRead);
ULONGLONG nFileSize = file.GetLength();
BYTE* pSrcData = new BYTE[nFileSize];
ZeroMemory(pSrcData,nFileSize);
file.SeekToBegin();
file.Read(pSrcData,nFileSize);
file.Close();

if (!ManualMapDll(hProc, pSrcData, nFileSize))
{
      delete[] pSrcData;
      CloseHandle(hProc);
      return false;
}
delete[] pSrcData;

CloseHandle(hProc);
return false;
}

bool ManualMapDll(HANDLE hProc, BYTE* pSrcData, SIZE_T FileSize, bool ClearHeader,
bool ClearNonNeededSections, bool AdjustProtections,
bool SEHExceptionSupport, DWORD fdwReason, LPVOID lpReserved)
{
IMAGE_NT_HEADERS* pOldNtHeader = nullptr;
IMAGE_OPTIONAL_HEADER* pOldOptHeader = nullptr;
IMAGE_FILE_HEADER* pOldFileHeader = nullptr;
BYTE* pTargetBase = nullptr;

if (reinterpret_cast(pSrcData)->e_magic != 0x5A4D)//"MZ"
{
      return false;
}

pOldNtHeader = reinterpret_cast(pSrcData + reinterpret_cast(pSrcData)->e_lfanew);
pOldOptHeader = &pOldNtHeader->OptionalHeader;
pOldFileHeader = &pOldNtHeader->FileHeader;

if (pOldFileHeader->Machine != CURRENT_ARCH)
{
      return false;
}

pTargetBase = reinterpret_cast(VirtualAllocEx(hProc, nullptr, pOldOptHeader->SizeOfImage, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE));
if (!pTargetBase)
{
      return false;
}

DWORD oldp = 0;
VirtualProtectEx(hProc, pTargetBase, pOldOptHeader->SizeOfImage, PAGE_EXECUTE_READWRITE, &oldp);

MANUAL_MAPPING_DATA data{ 0 };
data.pLoadLibraryA = LoadLibraryA;
data.pGetProcAddress = GetProcAddress;
#ifdef _WIN64
data.pRtlAddFunctionTable = (f_RtlAddFunctionTable)RtlAddFunctionTable;
#else
SEHExceptionSupport = false;
#endif
data.pbase = pTargetBase;
data.fdwReasonParam = fdwReason;
data.reservedParam = lpReserved;
data.SEHSupport = SEHExceptionSupport;

//PE header
if (!WriteProcessMemory(hProc, pTargetBase, pSrcData, 0x1000, nullptr)) //only first 0x1000 bytes for the header
{
      VirtualFreeEx(hProc, pTargetBase, 0, MEM_RELEASE);
      return false;
}

IMAGE_SECTION_HEADER* pSectionHeader = IMAGE_FIRST_SECTION(pOldNtHeader);
for (UINT i = 0; i != pOldFileHeader->NumberOfSections; ++i, ++pSectionHeader)
{
      if (pSectionHeader->SizeOfRawData)
      {
         if (!WriteProcessMemory(hProc, pTargetBase + pSectionHeader->VirtualAddress, pSrcData + pSectionHeader->PointerToRawData, pSectionHeader->SizeOfRawData, nullptr))
         {
            VirtualFreeEx(hProc, pTargetBase, 0, MEM_RELEASE);
            return false;
         }
      }
}

//Mapping params
BYTE* MappingDataAlloc = reinterpret_cast(VirtualAllocEx(hProc, nullptr, sizeof(MANUAL_MAPPING_DATA), MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE));
if (!MappingDataAlloc)
{
      VirtualFreeEx(hProc, pTargetBase, 0, MEM_RELEASE);
      return false;
}

if (!WriteProcessMemory(hProc, MappingDataAlloc, &data, sizeof(MANUAL_MAPPING_DATA), nullptr))
{
      VirtualFreeEx(hProc, pTargetBase, 0, MEM_RELEASE);
      VirtualFreeEx(hProc, MappingDataAlloc, 0, MEM_RELEASE);
      return false;
}

//Shell code
void* pShellcode = VirtualAllocEx(hProc, nullptr, 0x1000, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
if (!pShellcode)
{
      VirtualFreeEx(hProc, pTargetBase, 0, MEM_RELEASE);
      VirtualFreeEx(hProc, MappingDataAlloc, 0, MEM_RELEASE);
      return false;
}

if (!WriteProcessMemory(hProc, pShellcode, Shellcode, 0x1000, nullptr))
{
      VirtualFreeEx(hProc, pTargetBase, 0, MEM_RELEASE);
      VirtualFreeEx(hProc, MappingDataAlloc, 0, MEM_RELEASE);
      VirtualFreeEx(hProc, pShellcode, 0, MEM_RELEASE);
      return false;
}

HANDLE hThread = CreateRemoteThread(hProc, nullptr, 0, reinterpret_cast(pShellcode), MappingDataAlloc, 0, nullptr);
if (!hThread)
{
      VirtualFreeEx(hProc, pTargetBase, 0, MEM_RELEASE);
      VirtualFreeEx(hProc, MappingDataAlloc, 0, MEM_RELEASE);
      VirtualFreeEx(hProc, pShellcode, 0, MEM_RELEASE);
      return false;
}
WaitForSingleObject(hThread, INFINITE);
CloseHandle(hThread);

HINSTANCE hCheck = NULL;
while (!hCheck)
{
      DWORD exitcode = 0;
      GetExitCodeProcess(hProc, &exitcode);
      if (exitcode != STILL_ACTIVE)
      {
         return false;
      }

      MANUAL_MAPPING_DATA data_checked{ 0 };
      ReadProcessMemory(hProc, MappingDataAlloc, &data_checked, sizeof(data_checked), nullptr);
      hCheck = data_checked.hMod;

      if (hCheck == (HINSTANCE)0x404040)
      {
         VirtualFreeEx(hProc, pTargetBase, 0, MEM_RELEASE);
         VirtualFreeEx(hProc, MappingDataAlloc, 0, MEM_RELEASE);
         VirtualFreeEx(hProc, pShellcode, 0, MEM_RELEASE);
         return false;
      }
      else if (hCheck == (HINSTANCE)0x505050)
      {
         //Exception support failed!
      }

      Sleep(10);
}

BYTE* emptyBuffer = (BYTE*)malloc(1024 * 1024 * 20);
if (emptyBuffer == nullptr)
{
      return false;
}
memset(emptyBuffer, 0, 1024 * 1024 * 20);

//CLEAR PE HEAD
if (ClearHeader)
{
      WriteProcessMemory(hProc, pTargetBase, emptyBuffer, 0x1000, nullptr);
}
//END CLEAR PE HEAD

if (ClearNonNeededSections)
{
      pSectionHeader = IMAGE_FIRST_SECTION(pOldNtHeader);
      for (UINT i = 0; i != pOldFileHeader->NumberOfSections; ++i, ++pSectionHeader)
      {
         if (pSectionHeader->Misc.VirtualSize)
         {
            if ((SEHExceptionSupport ? 0 : strcmp((char*)pSectionHeader->Name, ".pdata") == 0) ||
                  strcmp((char*)pSectionHeader->Name, ".rsrc") == 0 ||
                  strcmp((char*)pSectionHeader->Name, ".reloc") == 0)
            {
                  WriteProcessMemory(hProc, pTargetBase + pSectionHeader->VirtualAddress, emptyBuffer, pSectionHeader->Misc.VirtualSize, nullptr);
            }
         }
      }
}

if (AdjustProtections)
{
      pSectionHeader = IMAGE_FIRST_SECTION(pOldNtHeader);
      for (UINT i = 0; i != pOldFileHeader->NumberOfSections; ++i, ++pSectionHeader)
      {
         if (pSectionHeader->Misc.VirtualSize)
         {
            DWORD old = 0;
            DWORD newP = PAGE_READONLY;

            if ((pSectionHeader->Characteristics & IMAGE_SCN_MEM_WRITE) > 0)
            {
                  newP = PAGE_READWRITE;
            }
            else if ((pSectionHeader->Characteristics & IMAGE_SCN_MEM_EXECUTE) > 0)
            {
                  newP = PAGE_EXECUTE_READ;
            }
            VirtualProtectEx(hProc, pTargetBase + pSectionHeader->VirtualAddress, pSectionHeader->Misc.VirtualSize, newP, &old);
         }
      }
      DWORD old = 0;
      VirtualProtectEx(hProc, pTargetBase, IMAGE_FIRST_SECTION(pOldNtHeader)->VirtualAddress, PAGE_READONLY, &old);
}

WriteProcessMemory(hProc, pShellcode, emptyBuffer, 0x1000, nullptr);
VirtualFreeEx(hProc, pShellcode, 0, MEM_RELEASE);
VirtualFreeEx(hProc, MappingDataAlloc, 0, MEM_RELEASE);

return true;
}

//#pragma runtime_checks( "", off )
//#pragma optimize( "", off )
void __stdcall Shellcode(MANUAL_MAPPING_DATA* pData)
{
if (!pData)
{
      pData->hMod = (HINSTANCE)0x404040;
      return;
}

BYTE* pBase = pData->pbase;
auto* pOpt = &reinterpret_cast(pBase + reinterpret_cast((uintptr_t)pBase)->e_lfanew)->OptionalHeader;

auto _LoadLibraryA = pData->pLoadLibraryA;
auto _GetProcAddress = pData->pGetProcAddress;
#ifdef _WIN64
auto _RtlAddFunctionTable = pData->pRtlAddFunctionTable;
#endif
auto _DllMain = reinterpret_cast(pBase + pOpt->AddressOfEntryPoint);

BYTE* LocationDelta = pBase - pOpt->ImageBase;
if (LocationDelta) {
      if (pOpt->DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size)
      {
         auto* pRelocData = reinterpret_cast(pBase + pOpt->DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress);
         const auto* pRelocEnd = reinterpret_cast(reinterpret_cast(pRelocData) + pOpt->DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size);
         while (pRelocData < pRelocEnd && pRelocData->SizeOfBlock)
         {
            UINT AmountOfEntries = (pRelocData->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION)) / sizeof(WORD);
            WORD* pRelativeInfo = reinterpret_cast(pRelocData + 1);

            for (UINT i = 0; i != AmountOfEntries; ++i, ++pRelativeInfo)
            {
                  if (RELOC_FLAG(*pRelativeInfo))
                  {
                     UINT_PTR* pPatch = reinterpret_cast(pBase + pRelocData->VirtualAddress + ((*pRelativeInfo) & 0xFFF));
                     *pPatch += reinterpret_cast(LocationDelta);
                  }
            }
            pRelocData = reinterpret_cast(reinterpret_cast(pRelocData) + pRelocData->SizeOfBlock);
         }
      }
}

if (pOpt->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].Size)
{
      auto* pImportDescr = reinterpret_cast(pBase + pOpt->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);
      while (pImportDescr->Name)
      {
         char* szMod = reinterpret_cast(pBase + pImportDescr->Name);
         HINSTANCE hDll = _LoadLibraryA(szMod);

         ULONG_PTR* pThunkRef = reinterpret_cast(pBase + pImportDescr->OriginalFirstThunk);
         ULONG_PTR* pFuncRef = reinterpret_cast(pBase + pImportDescr->FirstThunk);

         if (!pThunkRef)
            pThunkRef = pFuncRef;

         for (; *pThunkRef; ++pThunkRef, ++pFuncRef)
         {
            if (IMAGE_SNAP_BY_ORDINAL(*pThunkRef))
            {
                  *pFuncRef = (ULONG_PTR)_GetProcAddress(hDll, reinterpret_cast(*pThunkRef & 0xFFFF));
            }
            else
            {
                  auto* pImport = reinterpret_cast(pBase + (*pThunkRef));
                  *pFuncRef = (ULONG_PTR)_GetProcAddress(hDll, pImport->Name);
            }
         }
         ++pImportDescr;
      }
}

if (pOpt->DataDirectory[IMAGE_DIRECTORY_ENTRY_TLS].Size)
{
      auto* pTLS = reinterpret_cast(pBase + pOpt->DataDirectory[IMAGE_DIRECTORY_ENTRY_TLS].VirtualAddress);
      auto* pCallback = reinterpret_cast(pTLS->AddressOfCallBacks);
      for (; pCallback && *pCallback; ++pCallback)
         (*pCallback)(pBase, DLL_PROCESS_ATTACH, nullptr);
}

bool ExceptionSupportFailed = false;

#ifdef _WIN64

if (pData->SEHSupport)
{
      auto excep = pOpt->DataDirectory[IMAGE_DIRECTORY_ENTRY_EXCEPTION];
      if (excep.Size) {
         if (!_RtlAddFunctionTable(
            reinterpret_cast(pBase + excep.VirtualAddress),
            excep.Size / sizeof(IMAGE_RUNTIME_FUNCTION_ENTRY), (DWORD64)pBase))
         {
            ExceptionSupportFailed = true;
         }
      }
}

#endif

_DllMain(pBase, pData->fdwReasonParam, pData->reservedParam);

if (ExceptionSupportFailed)
      pData->hMod = reinterpret_cast(0x505050);
else
      pData->hMod = reinterpret_cast(pBase);
}

运行效果如下：

反射式DLL注入实现（ManualMap，手动解析PE并映射到目标进程...

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