DLL远程注入与卸载

以下提供两个函数，分别用于向其它进程注入和卸载指定DLL模块。
支持Unicode编码。

#include <windows.h>
#include <tchar.h>
#include <tlhelp32.h>

/************************************************************************************************************
* 函数名：InjectDll

* 参数：[in] const TCHAR* pszDllFile // Dll 文件名及路径
[in] DWORD dwProcessId // 目标进程 ID

* 返回值：bool - 注入成功返回 true，注入失败则返回 false

* 实现功能：向目标进程中注入一个指定 Dll 模块文件。
************************************************************************************************************/
bool InjectDll(const TCHAR* pszDllFile, DWORD dwProcessId)
{
// 参数无效
if (NULL == pszDllFile || 0 == ::_tcslen(pszDllFile))
{
return false;
}

// 指定 Dll 文件不存在
if (-1 == _taccess(pszDllFile, 0))
{
return false;
}

HANDLE hProcess = NULL;
HANDLE hThread = NULL;
DWORD dwSize = 0;
TCHAR* pszRemoteBuf = NULL;
LPTHREAD_START_ROUTINE lpThreadFun = NULL;

// 获取目标进程句柄
hProcess = ::OpenProcess(PROCESS_CREATE_THREAD | PROCESS_VM_OPERATION | PROCESS_VM_WRITE, FALSE, dwProcessId);
if (NULL == hProcess)
{
return false;
}

// 在目标进程中分配内存空间
dwSize = (DWORD)::_tcslen(pszDllFile) + 1;
pszRemoteBuf = (TCHAR*)::VirtualAllocEx(hProcess, NULL, dwSize * sizeof(TCHAR), MEM_COMMIT, PAGE_READWRITE);
if (NULL == pszRemoteBuf)
{
::CloseHandle(hProcess);
return false;
}

// 在目标进程的内存空间中写入所需参数(模块名)
if (FALSE == ::WriteProcessMemory(hProcess, pszRemoteBuf, (LPVOID)pszDllFile, dwSize * sizeof(TCHAR), NULL))
{
::VirtualFreeEx(hProcess, pszRemoteBuf, dwSize, MEM_DECOMMIT);
::CloseHandle(hProcess);
return false;
}

// 从 Kernel32.dll 中获取 LoadLibrary 函数地址
#ifdef _UNICODE
lpThreadFun = (PTHREAD_START_ROUTINE)::GetProcAddress(::GetModuleHandle(_T("Kernel32")), "LoadLibraryW");
#else
lpThreadFun = (PTHREAD_START_ROUTINE)::GetProcAddress(::GetModuleHandle(_T("Kernel32")), "LoadLibraryA");
#endif
if (NULL == lpThreadFun)
{
::VirtualFreeEx(hProcess, pszRemoteBuf, dwSize, MEM_DECOMMIT);
::CloseHandle(hProcess);
return false;
}

// 创建远程线程调用 LoadLibrary
hThread = ::CreateRemoteThread(hProcess, NULL, 0, lpThreadFun, pszRemoteBuf, 0, NULL);
if (NULL == hThread)
{
::VirtualFreeEx(hProcess, pszRemoteBuf, dwSize, MEM_DECOMMIT);
::CloseHandle(hProcess);
return false;
}

// 等待远程线程结束
::WaitForSingleObject(hThread, INFINITE);

// 清理
::VirtualFreeEx(hProcess, pszRemoteBuf, dwSize, MEM_DECOMMIT);
::CloseHandle(hThread);
::CloseHandle(hProcess);

return true;
}

/************************************************************************************************************
* 函数名：UnInjectDll

* 参数：[in] const TCHAR* pszDllFile // Dll 文件名及路径
[in] DWORD dwProcessId // 目标进程 ID

* 返回值：bool - 卸载成功返回 true，卸载失败则返回 false

* 实现功能：从目标进程中卸载一个指定 Dll 模块文件。
************************************************************************************************************/
bool UnInjectDll(const TCHAR* pszDllFile, DWORD dwProcessId)
{
// 参数无效
if (NULL == pszDllFile || 0 == ::_tcslen(pszDllFile))
{
return false;
}

HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
HANDLE hProcess = NULL;
HANDLE hThread = NULL;

// 获取模块快照
hModuleSnap = ::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, dwProcessId);
if (INVALID_HANDLE_VALUE == hModuleSnap)
{
return false;
}

MODULEENTRY32 me32;
memset(&me32, 0, sizeof(MODULEENTRY32));
me32.dwSize = sizeof(MODULEENTRY32);

// 开始遍历
if(FALSE == ::Module32First(hModuleSnap, &me32))
{
::CloseHandle(hModuleSnap);
return false;
}

// 遍历查找指定模块
bool isFound = false;
do
{
isFound = (0 == ::_tcsicmp(me32.szModule, pszDllFile) || 0 == ::_tcsicmp(me32.szExePath, pszDllFile));
if (isFound) // 找到指定模块
{
break;
}
} while (TRUE == ::Module32Next(hModuleSnap, &me32));

::CloseHandle(hModuleSnap);

if (false == isFound)
{
return false;
}

// 获取目标进程句柄
hProcess = ::OpenProcess(PROCESS_CREATE_THREAD | PROCESS_VM_OPERATION, FALSE, dwProcessId);
if (NULL == hProcess)
{
return false;
}

// 从 Kernel32.dll 中获取 FreeLibrary 函数地址
LPTHREAD_START_ROUTINE lpThreadFun = (PTHREAD_START_ROUTINE)::GetProcAddress(::GetModuleHandle(_T("Kernel32")), "FreeLibrary");
if (NULL == lpThreadFun)
{
::CloseHandle(hProcess);
return false;
}

// 创建远程线程调用 FreeLibrary
hThread = ::CreateRemoteThread(hProcess, NULL, 0, lpThreadFun, me32.modBaseAddr /* 模块地址 */, 0, NULL);
if (NULL == hThread)
{
::CloseHandle(hProcess);
return false;
}

// 等待远程线程结束
::WaitForSingleObject(hThread, INFINITE);

// 清理
::CloseHandle(hThread);
::CloseHandle(hProcess);

return true;
}

DLL远程注入与卸载

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