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RanSim by KnowBe4


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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.


Edited by LiquidTension
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