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RanSim by KnowBe4


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Greetings,

Thanks for the info.  I'm not sure what methods are being used by the testing tool or how Malwarebytes' Devs and Researchers would expect MBARW to deal with simulations like this, however I will be sure to pass your findings on to the Product team for analysis.

Thanks

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The latest version of RanSim is completely unrealistic and does not simulate the behaviour that real-world ransomware typically exhibits.

More concretely, the latest version of RanSim only encrypts files in a non-standard working directory inside %LocalAppData% (i.e. C:\Users\XYZ\AppData\Local\RSimulator\TestFolder\Tests\XX-Tests) and does not encrypt files in directories where real-world users’ files are typically found (e.g. Desktop, Downloads, Documents, etc.). Therefore, RanSim does not simulate real ransomware behaviour and therefore does not trigger our behaviour-based Anti-Ransomware detection engine. See the attached image.

We have tested Malwarebytes Anti-Ransomware against all ransomware families that RanSim attempts to simulate, and we can confirm that we do detect and block (relying on behaviour, not signatures) the encryption activity of those ransomware families. The only exception is RigSimulator (which simulates a Monero mining rig) which is not ransomware. However, we detect the RigSimulator malware family with our rule-based anti-malware engine.

RanSim.png

Edited by LiquidTension
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Time not wasted.  If you had not asked the question and showed concern, someone else would have.  We got a chance to respond and everyone is a bit wiser now.  Thank YOU!

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