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Regsvr32.exe (.sct) Application Whitelisting Bypass Server

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Regsvr32.exe (.sct) Application Whitelisting Bypass Server

Disclosed
04/19/2016
Created
05/30/2018

Description

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.

Author(s)

  • Casey Smith
  • Trenton Ivey

Platform

Windows

Architectures

x86, x64

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use exploit/windows/misc/regsvr32_applocker_bypass_server
msf exploit(regsvr32_applocker_bypass_server) > show targets
    ...targets...
msf exploit(regsvr32_applocker_bypass_server) > set TARGET < target-id >
msf exploit(regsvr32_applocker_bypass_server) > show options
    ...show and set options...
msf exploit(regsvr32_applocker_bypass_server) > exploit

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security

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