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要实现线程的远程注入必须使用Windows提供的CreateRemoteThread函数来创建一个远程线程该函数的原型如下：

至此创建远程线程的工作全部结束，下面就给出完整的代码：

#pragma once
#include "stdafx.h"
#include <windows.h>
#include <TlHelp32.h>
#include <iostream>

//线程参数结构体定义
typedef struct _RemoteParam {
     char szMsg[12];     //MessageBox函数中显示的字符提示
     DWORD dwMessageBox;//MessageBox函数的入口地址
} RemoteParam, * PRemoteParam;

//定义MessageBox类型的函数指针
typedef int (__stdcall * PFN_MESSAGEBOX)(HWND, LPCTSTR, LPCTSTR, DWORD);


//线程函数定义
DWORD __stdcall threadProc(LPVOID lParam)
{
     RemoteParam* pRP = (RemoteParam*)lParam;

     PFN_MESSAGEBOX pfnMessageBox;
     pfnMessageBox = (PFN_MESSAGEBOX)pRP->dwMessageBox;
     pfnMessageBox(NULL, pRP->szMsg, pRP->szMsg, 0);

     return 0;
}

//提升进程访问权限
bool enableDebugPriv()
{
     HANDLE hToken;
     LUID sedebugnameValue;
     TOKEN_PRIVILEGES tkp;
  
     if (!OpenProcessToken(GetCurrentProcess(), 
         TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken)) {
         return false;
     }

     if (!LookupPrivilegeValue(NULL, SE_DEBUG_NAME, &sedebugnameValue)) {
         CloseHandle(hToken);
         return false;
     }

     tkp.PrivilegeCount = 1;
     tkp.Privileges[0].Luid = sedebugnameValue;
     tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;

     if (!AdjustTokenPrivileges(hToken, FALSE, &tkp, sizeof(tkp), NULL, NULL)) {
         CloseHandle(hToken);
         return false;
     }

     return true;
}


//根据进程名称得到进程ID,如果有多个运行实例的话，返回第一个枚举到的进程的ID
DWORD processNameToId(LPCTSTR lpszProcessName)
{
     HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
     PROCESSENTRY32 pe;
     pe.dwSize = sizeof(PROCESSENTRY32);

     if (!Process32First(hSnapshot, &pe)) {
         MessageBox(NULL, 
             "The frist entry of the process list has not been copyied to the buffer", 
            "Notice", MB_ICONINFORMATION | MB_OK);
         return 0;
     }

     while (Process32Next(hSnapshot, &pe)) {
         if (!strcmp(lpszProcessName, pe.szExeFile)) {
             return pe.th32ProcessID;
         }
     }

     return 0;
}

int main(int argc, char* argv[])
{
     //定义线程体的大小
     const DWORD dwThreadSize = 4096;
     DWORD dwWriteBytes;
     //提升进程访问权限
     enableDebugPriv();

     //等待输入进程名称，注意大小写匹配
     std::cout << "Please input the name of target process !" << std::endl;
     char szExeName[MAX_PATH] = { 0 };
     std::cin >> szExeName;

     DWORD dwProcessId = processNameToId(szExeName);

     if (dwProcessId == 0) {
         MessageBox(NULL, "The target process have not been found !",
             "Notice", MB_ICONINFORMATION | MB_OK);
         return -1;
     }

     //根据进程ID得到进程句柄
     HANDLE hTargetProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwProcessId);

     if (!hTargetProcess) {
         MessageBox(NULL, "Open target process failed !", 
             "Notice", MB_ICONINFORMATION | MB_OK);
         return 0;
     }

     //在宿主进程中为线程体开辟一块存储区域
     //在这里需要注意MEM_COMMIT | MEM_RESERVE内存非配类型以及PAGE_EXECUTE_READWRITE内存保护类型
     //其具体含义请参考MSDN中关于VirtualAllocEx函数的说明。
     void* pRemoteThread = VirtualAllocEx(hTargetProcess, 0, 
         dwThreadSize, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);

     if (!pRemoteThread) {
         MessageBox(NULL, "Alloc memory in target process failed !", 
             "notice", MB_ICONINFORMATION | MB_OK);
         return 0;
     }

     //将线程体拷贝到宿主进程中
     if (!WriteProcessMemory(hTargetProcess, 
             pRemoteThread, &threadProc, dwThreadSize, 0)) {
         MessageBox(NULL, "Write data to target process failed !", 
             "Notice", MB_ICONINFORMATION | MB_OK);
         return 0;
     }
     //定义线程参数结构体变量
     RemoteParam remoteData;
     ZeroMemory(&remoteData, sizeof(RemoteParam));

     //填充结构体变量中的成员
     HINSTANCE hUser32 = LoadLibrary("User32.dll");
     remoteData.dwMessageBox = (DWORD)GetProcAddress(hUser32, "MessageBoxA");
     strcat(remoteData.szMsg, "Hello\0");

     //为线程参数在宿主进程中开辟存储区域
     RemoteParam* pRemoteParam = (RemoteParam*)VirtualAllocEx(
     hTargetProcess , 0, sizeof(RemoteParam), MEM_COMMIT, PAGE_READWRITE);

     if (!pRemoteParam) {
         MessageBox(NULL, "Alloc memory failed !", 
             "Notice", MB_ICONINFORMATION | MB_OK);
         return 0;
     }

     //将线程参数拷贝到宿主进程地址空间中
     if (!WriteProcessMemory(hTargetProcess ,
             pRemoteParam, &remoteData, sizeof(remoteData), 0)) {
         MessageBox(NULL, "Write data to target process failed !", 
             "Notice", MB_ICONINFORMATION | MB_OK);
         return 0;
     }

     //在宿主进程中创建线程
     HANDLE hRemoteThread = CreateRemoteThread(
         hTargetProcess, NULL, 0, (DWORD (__stdcall *)(void *))pRemoteThread, 
         pRemoteParam, 0, &dwWriteBytes);

     if (!hRemoteThread) {
         MessageBox(NULL, "Create remote thread failed !", "Notice",   MB_ICONINFORMATION | MB_OK);
         return 0;
     }

     CloseHandle(hRemoteThread);

     return 0;
}

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vc++教程之CreateRemoteThread