Botconf Author Listing

Jonas Wagner

Last known affiliation: Threatray
Bio: Jonas Wagner is the co-founder and CTO of Threatray and has built the technological foundation of its code search engine based on years of research and development. He holds a Masters Degree in Cybersecurity from the Bern University of Applied Sciences. He has previously spoken at FIRST, BSides Zürich, DFRWS and many private events.
Date: 2023-04-11
Using systematic code reuse analysis to create robust YARA rules
Jonas Wagner 🗣 | Carlos Rubio Ricote 🗣 | David Pastor Sanz 🗣

Abstract (click to view)

YARA is a commonly used tool to detect and identify malware. There are roughly two types of YARA rules used on binary files: 1) based on metadata and strings and 2) based on code.
There are certain benefits by basing YARA rules on code. Since code reuse is frequent amongst binaries of a malware family, it offers plenty of options to base a YARA rule on. If the chosen code is heavily reused amongst the binaries, then it can result in very robust rules.
This approach comes with certain challenges. A key aspect is being able to find heavily reused code amongst many binaries of a malware family. Unless some sort of automation is at play, this quickly becomes difficult and time-consuming. Once suitable reused code is identified, it needs to be turned into a YARA rule, so that it works even when compiler differences, optimizations or instruction set changes are involved.
In this workshop we will create robust YARA rules for a handful of malware families based on automatically identifying shared code between many binaries of a family.

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