远程控制电脑的木马程序是一种恶意软件，它隐藏在系统内部，可以从远程服务器接收指令并执行。这种木马程序可以被黑客用来偷取敏感信息，攻击其他系统或者控制受害者的计算机。在本文中，我们将使用C++编写一个简单的远程控制电脑的木马程序。

第一步是编写客户端程序，客户端程序负责连接远程服务器，接收指令并传递给受害者的计算机。以下是客户端程序的代码：

#include <iostream>
#include <WinSock2.h>
#pragma comment (lib,"ws2_32.lib")
#define DEFAULT_BUFLEN 1024
#define SERVER_ADDR "192.168.1.100"
#define SERVER_PORT 8888
using namespace std;
int main()
{
  WSADATA wsaData;
  SOCKET ConnectSocket = INVALID_SOCKET;
  struct addrinfo* result = NULL,
    * ptr = NULL,
    hints;
  char sendbuf[DEFAULT_BUFLEN];
  char recvbuf[DEFAULT_BUFLEN];
  int iResult;
  int recvbuflen = DEFAULT_BUFLEN;
  // Initialize Winsock
  iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
  if (iResult != 0)
    cout << "WSAStartup failed: " << iResult << endl;
    return 1;
  
  ZeroMemory(&hints, sizeof(hints));
  hints.ai_family = AF_UNSPEC;
  hints.ai_socktype = SOCK_STREAM;
  hints.ai_protocol = IPPROTO_TCP;
  // Resolve the server address and port
  iResult = getaddrinfo(SERVER_ADDR, "8888", &hints, &result);
  if (iResult != 0) {
    cout << "getaddrinfo failed: " << iResult << endl;
    WSACleanup();
    return 1;
  }
  // Attempt to connect to the first address returned by
  ptr = result;
  ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype, ptr->ai_protocol);
  if (ConnectSocket == INVALID_SOCKET) {
    cout << "Error at socket(): " << WSAGetLastError() << endl;
    freeaddrinfo(result);
    WSACleanup();
    return 1;
  }
  // Connect to server.
  iResult = connect(ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
  if (iResult == SOCKET_ERROR) {
    closesocket(ConnectSocket);
    ConnectSocket = INVALID_SOCKET;
  }
  // Free address info
  freeaddrinfo(result);
  if (ConnectSocket == INVALID_SOCKET) {
    cout << "Unable to connect to server!" << endl;
    WSACleanup();
    return 1;
  }
  // Receive until the peer closes the connection
  do {
    iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
    if (iResult > 0) {
      cout << "Received: " << recvbuf << endl;
      strcpy(sendbuf, "I received the message!");
      send(ConnectSocket, sendbuf, iResult, 0);
    }
    else if (iResult == 0)
      cout << "Connection closing" << endl;
    else
      cout << "recv failed: " << WSAGetLastError() << endl;
  } while (iResult > 0);
  // shutdown the connection since we're done
  iResult = shutdown(ConnectSocket, SD_SEND);
  closesocket(ConnectSocket);
  WSACleanup();
  return 0;
}

代码主要是使用Winsock2库来建立连接和发送接收数据，程序运行后会连接到指定IP地址的服务器，并等待接收指令。当接收到指令时，客户端程序将打印出接收到的消息，并通过连接发送一个确认信息。

第二步是编写服务器端程序，服务器端程序负责向客户端发送指令并接收客户端的响应。以下是服务器端程序的代码：

#include <iostream>
#include <WinSock2.h>
#pragma comment (lib,"ws2_32.lib")
#define DEFAULT_BUFLEN 1024
#define PORT "8888"
using namespace std;
int main()
{
  WSADATA wsaData;
  SOCKET ListenSocket = INVALID_SOCKET;
  SOCKET ClientSocket = INVALID_SOCKET;
  struct addrinfo* result = NULL;
  struct addrinfo hints;
  char recvbuf[DEFAULT_BUFLEN];
  int recvbuflen = DEFAULT_BUFLEN;
  int iResult;
  // Initialize Winsock
  iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
  if (iResult != 0)
    cout << "WSAStartup failed: " << iResult << endl;
    return 1;
  
  // Setup hints for getaddrinfo
  ZeroMemory(&hints, sizeof(hints));
  hints.ai_family = AF_INET;
  hints.ai_socktype = SOCK_STREAM;
  hints.ai_protocol = IPPROTO_TCP;
  hints.ai_flags = AI_PASSIVE;
  // Resolve the server address and port
  iResult = getaddrinfo(NULL, PORT, &hints, &result);
  if (iResult != 0) {
    cout << "getaddrinfo failed: " << iResult << endl;
    WSACleanup();
    return 1;
  }
  // Create a SOCKET for the server to listen for client connections
  ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);
  if (ListenSocket == INVALID_SOCKET) {
    cout << "Error at socket(): " << WSAGetLastError() << endl;
    freeaddrinfo(result);
    WSACleanup();
    return 1;
  }
  // Set up the TCP listening socket
  iResult = bind(ListenSocket, result->ai_addr, (int)result->ai_addrlen);
  if (iResult == SOCKET_ERROR) {
    cout << "bind failed: " << WSAGetLastError() << endl;
    freeaddrinfo(result);
    closesocket(ListenSocket);
    WSACleanup();
    return 1;
  }
  // Free address info
  freeaddrinfo(result);
  // Listen on the socket
  iResult = listen(ListenSocket, SOMAXCONN);
  if (iResult == SOCKET_ERROR) {
    cout << "listen failed: " << WSAGetLastError() << endl;
    closesocket(ListenSocket);
    WSACleanup();
    return 1;
  }
  // Accept a client socket
  ClientSocket = accept(ListenSocket, NULL, NULL);
  if (ClientSocket == INVALID_SOCKET) {
    cout << "accept failed: " << WSAGetLastError() << endl;
    closesocket(ListenSocket);
    WSACleanup();
    return 1;
  }
  // Send an initial message to client
  iResult = send(ClientSocket, "Hello, I'm the server!", 23, 0);
  if (iResult == SOCKET_ERROR) {
    cout << "send failed: " << WSAGetLastError() << endl;
    closesocket(ClientSocket);
    WSACleanup();
    return 1;
  }
  // Receive until the peer closes the connection
  do {
    iResult = recv(ClientSocket, recvbuf, recvbuflen, 0);
    if (iResult > 0)
      cout << "Received: " << recvbuf << endl;
    
    else if (iResult == 0)
      cout << "Connection closing" << endl;
    else
      cout << "recv failed: " << WSAGetLastError() << endl;
  } while (iResult > 0);
  // shutdown the connection since we're done
  iResult = shutdown(ClientSocket, SD_SEND);
  closesocket(ClientSocket);
  WSACleanup();
  return 0;
}

代码主要是使用Winsock2库来建立连接和发送接收数据，程序运行后会绑定本地IP地址和指定端口，等待客户端的连接。当客户端连接成功后，服务器端程序将向客户端发送一条消息，并等待接收客户端的响应。

这是一个简单的远程控制电脑的木马程序示例，程序只是为了演示如何建立连接和发送接收数据，实际上，木马程序可能会更加复杂和深入。因此，我们应该时刻注意计算机安全，保护好自己的系统和个人信息。

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