>> If your altered virus sample ?> still executes correctly, you have simply created a new virus ?> variant. > >Not exactly, please look at this virustotal.com log >http://www.securityelf.org/updmagic.html > >The altered (120 bytes prepended) TXT_* variant is STILL detected by your >product (CA), but when I change the first byte from "Z" to "M" - your >product >fails (MZ_* variant). The virus scanner determined the type of the file by the header and it failed. That's bad news. I am wondering however, when I execute that file, how does the OS process the file? I guess my question is, if I have a modified version of a virus, with whatever header, if I try to execute that file, will the virus code get executed? Cosmin Stejerean
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