【windows核心编程】使用远程线程注入DLL

前言

该技术是指通过在【目标进程】中创建一个【远程线程】来达到注入的目的。

创建的【远程线程】函数为LoadLibrary， 线程函数的参数为DLL名字， 想要做的工作在DLL中编写。

 示意图如下:

 相关API

1、创建远程线程

//该函数除了第一个参数为目标进程句柄外
//其他参数均和CreateThread一样
HANDLE hThread = CreateRemoteThread(
                __in HANDLE  hProcess,  //目标进程句柄
                __in_opt LPSECURITY_ATTRIBUTES lpThreadAttributes,
                __in SIZE_T dwStackSize,     //线程栈初始预定空间=Max(/STACK, dwStackSize, 初始调拨大小=(dwStackSize == 0?  /STACK, dwStackSize)
                __in LPTHREAD_START_ROUTINE lpStartAddress, //线程函数
                __in_opt LPVOID lpParameter,    //线程函数参数
                __in DWORD dwCreationFlags,     //标志
                __out_opt LPDWORD lpThreadId    //线程ID
               )

 失败返回NULL

2、根据进程ID获取进程句柄，并且传入相应权限标志，自定义函数

//根据进程ID获取进程句柄
HANDLE GetProcessHandle(DWORD deProcessID)
{
    HANDLE hProcess = OpenProcess(
        PROCESS_QUERY_INFORMATION  //查询进程句柄
        | PROCESS_VM_OPERATION     //PROCESS_VM_WRITE + PROCESS_VM_READ + x
        | PROCESS_CREATE_THREAD    //创建线程
        | PROCESS_VM_WRITE,        //WriteProcessMemory
        FALSE,                     //不继承
        deProcessID                //进程句柄
        ); 

    return hProcess;
}

3、获得LoadLibrary函数地址

由于LoadLibrary是个宏，而非实际的函数，因此需要使用GetProcAddress并传入LoadLibraryW 或 LoadLibraryA来获取真实地址

 4、从目标进程申请内存

当把Dll名字作为线程函数LoadLibraryW(A)的参数传给他时，由于此时的线程是运行在其他进程地址空间中的，因此当把本地进程中的字符串指针传给CreateRemoteThread函数时会引起访问违例，因此需要从目标进程地址空间中申请内存，并将本地Dll名字符串写入远程进程，然后使用远程进程中的地址作为CreateRemoteThread函数的参数。

//该函数除了第一个参数为进程句柄外
//其他参数和VirtualAlloc一样
LPVOID WINAPI VirtualAllocEx(
  __in      HANDLE hProcess,       //进程句柄
  __in_opt  LPVOID lpAddress,   //地址，为NULL自动找一个合适的地址
  __in      SIZE_T dwSize,           //内存块大小，单位为字节
  __in      DWORD flAllocationType, //分配类型，预定或调拨
  __in      DWORD flProtect             //保护属性
);

5、往远程进程中写输入， 即把本地DLL名字字符串 写入 远程进程地址空间中

BOOL WINAPI WriteProcessMemory(
  __in   HANDLE hProcess,         //进程句柄
  __in   LPVOID lpBaseAddress, //写入地址
  __in   LPCVOID lpBuffer,          //源缓冲区
  __in   SIZE_T nSize,                 //缓冲区大小，单位为字节
  __out  SIZE_T *lpNumberOfBytesWritten  //实际写入的字节数
);

No code you say a XX

本demo的作用是将一个DLL注入一个窗口标题为"Endl"的目标进程，该DLL的作用是在DLL_PROCESS_ATTACH中ExitProcess，即强制退出目标进程。

开发进程代码

//根据进程ID获取进程句柄
HANDLE GetProcessHandle(DWORD deProcessID)
{
    HANDLE hProcess = OpenProcess(
        PROCESS_QUERY_INFORMATION  //查询进程句柄
        | PROCESS_VM_OPERATION     //PROCESS_VM_WRITE + PROCESS_VM_READ + x
        | PROCESS_CREATE_THREAD    //创建线程
        | PROCESS_VM_WRITE,        //WriteProcessMemory
        FALSE,                     //不继承
        deProcessID                //进程句柄
        ); 

    return hProcess;
}

int _tmain(int argc, _TCHAR* argv[])
{
    DWORD dwErrCode = ;

    //获取进程ID
    //HWND hWnd = FindWindow(NULL, _T("计算器"));
    HWND hWnd = FindWindow(NULL, _T("Endl"));

    DWORD dwProcessID = ;
    GetWindowThreadProcessId(hWnd, &dwProcessID);
    HANDLE hDestProcess = GetProcessHandle(dwProcessID);
    if(NULL == hDestProcess)
    {
        cerr<<"打开进程句柄失败"<<endl;
        return ;
    }

    //获取KERNER32.DLL 模块句柄
    HMODULE hModule = GetModuleHandle(_T("kernel32.dll"));
    if(NULL == hModule)
    {
        cerr<<"获取kernel32.dll句柄失败"<<endl;
        return -;
    }

    //线程函数，kernerl32.dll被映射到所有进程内相同的地址
    LPTHREAD_START_ROUTINE lpThreadStartRoutine = 
                         (LPTHREAD_START_ROUTINE)GetProcAddress(hModule, "LoadLibraryW");
    if(NULL == lpThreadStartRoutine)
    {
        cerr<<"获取LoadLibraryW地址失败"<<endl;
        return -;
    }

    //从目标进程内申请堆内存
    LPVOID lpMemory = VirtualAllocEx(
                     hDestProcess, NULL, MAX_PATH, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
    if(NULL == lpMemory)
    {
        cerr<<"申请目标进程内存失败"<<endl;
        return -;
    }

    //注入DLL
    LPCTSTR lpDLLName = _T("DLLForRemoteThread.dll");

    //把DLL名字写入目标进程
    BOOL bWriteMemory = WriteProcessMemory(
        hDestProcess, lpMemory, lpDLLName, (_tcslen(lpDLLName) + ) * sizeof(lpDLLName[]), NULL);

    if(FALSE == bWriteMemory)
    {
        cerr<<"WriteProcessMemory失败"<<endl;
        dwErrCode = GetLastError();
        VirtualFreeEx(hModule, lpMemory, , MEM_RELEASE | MEM_DECOMMIT);
        return -;
    }

    //创建远程线程
    HANDLE hThread = CreateRemoteThread(
        hDestProcess,
        NULL,
        ,
        lpThreadStartRoutine,
        lpMemory,
        ,
        NULL);
    if (NULL == hThread || INVALID_HANDLE_VALUE == hThread)
    {
        cerr<<"创建远程线程CreateRomoteThread失败"<<endl;
        VirtualFreeEx(hModule, lpMemory, , MEM_RELEASE | MEM_DECOMMIT);
        return -;
    }

    VirtualFreeEx(hModule, lpMemory, , MEM_RELEASE | MEM_DECOMMIT);  

    return ;
}

 待注入DLL代码

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch(ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
#if defined _DEBUG
        OutputDebugString(TEXT("\r\n*************DLL_PROCESS_ATTACH*************"));
#endif
        ExitProcess();
        break;
    case DLL_THREAD_ATTACH:
        break;
    case DLL_THREAD_DETACH:
        break;
    case DLL_PROCESS_DETACH:
        break;
    }

    return TRUE;
}