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Video Reviews - Security and Privacy
My own "ransomware" vs Windows Defender
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<blockquote data-quote="struppigel" data-source="post: 876446" data-attributes="member: 86910"><p>Heuristics have the issue that ransomware behaviour is not distinguishable from e.g. backup software that saves space by compressing files. Compression looks just like encryption, it raises the entropy. Renaming lots of files at once is not malicious, nor is encryption or compression. These actions only become malicious in context. So most of the time there needs to be something additional like anti-AV features, UAC bypass features, shadow copy deletion, certain ransom note keywords, code injection.</p><p></p><p>If you create a bare ransomware from scratch just using the encryption portion and no additional features, there is no way to detect it with heuristics without also flagging legitimate software.</p></blockquote><p></p>
[QUOTE="struppigel, post: 876446, member: 86910"] Heuristics have the issue that ransomware behaviour is not distinguishable from e.g. backup software that saves space by compressing files. Compression looks just like encryption, it raises the entropy. Renaming lots of files at once is not malicious, nor is encryption or compression. These actions only become malicious in context. So most of the time there needs to be something additional like anti-AV features, UAC bypass features, shadow copy deletion, certain ransom note keywords, code injection. If you create a bare ransomware from scratch just using the encryption portion and no additional features, there is no way to detect it with heuristics without also flagging legitimate software. [/QUOTE]
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