Hijacking .NET to Defend PowerShell

Presented at BSidesSF 2017, Feb. 13, 2017, 2:50 p.m. (30 minutes).

You need to have the mind of a hacker to know how to defend. With the rise of attacks implementing PowerShell in the recent months, there hasn't been a solid solution for monitoring or prevention. Currently Microsoft released the AMSI solution for PowerShell v5 however this can also be bypassed. This talk will focus on utilizing various stealthy runtime .NET hijacking techniques implemented for blue teamer defenses for PowerShell attacks. The presentation will start with a light intro into .NET and PowerShell, then a deeper look into various attacker techniques which will be explained in the perspective of the blue teamer. Techniques include assembly modification, class & method injection, compiler profiling, and C based function hooking.

Presenters:

• Amanda Rousseau - Malware Research Unicorn - Endgame
  Amanda absolutely loves malware. She works as a Malware Researcher at Endgame who focuses on attacker technique application to dynamic behavior detection both on Windows and OSX platforms.

Links:

• https://bsidessf2017.sched.com/event/9ILe/hijacking-net-to-defend-powershell

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• BSidesDC 2016 / PowerShell Security: Defending the Enterprise from the Latest Attack Platform
• DeepSec 2015 „DeepSec No. 9“ / PowerShell for Penetration Testers
• PancakesCon 1 (2020) Virtual / PowerShell and Pickling