Hiding .NET IL code from DnSpy with R2R Stomping

[@MalwareAnalysisForHedgehogs]

We create a .NET executable that hides code from decompilation and debugging with DnSpy by using a technique called R2R Stomping. Afterwards we explore how to analyse such samples and what effect it has on antivirus detection.
Malware course: www.udemy.com/course/windows-...
Checkpoint article: research.checkpoint.com/2023/...
Twitter: twitter.com/struppigel

[@npawan888]

Will work on this tonight thanks for the demo

[@tacrom]

Exellent, thank you, very informative, subscribed.

[@donaldduck6198]

A few years ago Didier Stevens wrote about "VBA Stomping", the concept is similar to your video

[@ledlou2177]

Is there way modifying the prioritisation of the execution of native vs. IL code?

[@MalwareAnalysisForHedgehogs]

Hi. I am not sure I understand your question. Why and when would you modify it?

[@ledlou2177]

@@MalwareAnalysisForHedgehogs Just to check the vulnerability of stomping, e.g. bypassing the native code run to the favour of the IL code, etc.

[@MalwareAnalysisForHedgehogs]

@@ledlou2177 I am not aware of a way to do that.

[@user-xg8sd9fl3e]

one plus to making the binary bigger, might be too large to be analyzed by dynamic scanners

[@una-az]

Thank you for the great video. Are there other .NET techniques that hides the code from DnSpy?

[@MalwareAnalysisForHedgehogs]

Thank you.
Yes, there are, albeit not that impressive. E.g. encrypting the code and decrypting the code in .cctor (see the video before that one about what executes before main)

[@Options_99]

nice video, edit and background

[@_zproxy]

ILONLY used to be cool