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Using Metasm To Avoid Antivirus Detection (Ghost Writing ASM)

Using Metasm To Avoid Antivirus Detection (Ghost Writing ASM)

It seems that more and more these days I find myself battling head to head against my client’s Antivirus Detection capabilities. Payloads I encoded to successfully bypass one solution get picked up by another. An executable that walked effortlessly past one AV this week gets stopped dead in its tracks by the very same software build at a different client the week later. This is a frustrating and constant problem for myself and many other Penetration Testers I am sure.

The topic of Antivirus Detection bypass is not a new one by any means. Currently there exist several methodologies that work well and I don’t think anyone (at least no one I know) can respectfully make a claim for a particular method being the De facto standard that works every time.

This article aims to provide some insight into one such method that I have become fond of and has proven quite successful in many of my recent Information Security Assessments. I first became aware of the technique by reading This Great Writeup from exploit-db. I’m not sure if the author is responsible for coining the term or not but they refer to this ancient wisdom and all of its magical powers under the alias “Ghost Writing” which I think sounds super cool!
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