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General Security Discussions
STOP/DJVU Ransomware Vaccine
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<blockquote data-quote="struppigel" data-source="post: 967846" data-attributes="member: 86910"><p>I am not sure why and can only guess.</p><p></p><p>As a malware author you might prefer to create a 32 bit file to cover a wider range of susceptible systems that includes all the outdated ones (32 bit also works on 64 bit machines, so this is the better option in regards to mass targetting malware). Also 32 bit malware has been around far longer in general. So for many malware families the AV systems only see 32 bit versions.</p><p></p><p>For performance reasons almost all signature based detections are tied to file types. 32 bit PE files are handled differently than 64 bit (they need slightly different parsing). So the signatures that were created for 32 bit malware only work on 32 bit files, thus can only have false positives on 32 bit files.</p></blockquote><p></p>
[QUOTE="struppigel, post: 967846, member: 86910"] I am not sure why and can only guess. As a malware author you might prefer to create a 32 bit file to cover a wider range of susceptible systems that includes all the outdated ones (32 bit also works on 64 bit machines, so this is the better option in regards to mass targetting malware). Also 32 bit malware has been around far longer in general. So for many malware families the AV systems only see 32 bit versions. For performance reasons almost all signature based detections are tied to file types. 32 bit PE files are handled differently than 64 bit (they need slightly different parsing). So the signatures that were created for 32 bit malware only work on 32 bit files, thus can only have false positives on 32 bit files. [/QUOTE]
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