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Antiviruses easily defeated by CTPH?


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#1 access2godzila

access2godzila

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Posted 27 March 2012 - 10:20 AM

I was just experimenting with ssdeep for a few days. It is a program that generates CTPH (context triggered piecewise hashes) from files, and can be used to recognize similar files easily along with a similarity score. And then something came to my mind I wrote a very small program, modified the first slightly and produced a second one, and compared the hashes for two files :

$ ssdeep -dl foo.exe bar.exe
def.exe matches abc.exe (99)

Thus it seems that we can recognize similar executables.

If that's the case, then can't malware also take its advantage, and kill/delete the processes antivirus/antimalware programs? Does any present form of malware already do this? Its already giving me the creeps.

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