reformat the hard drive and reload the operating system. then restore from a backup date previous to the date of infection. all data stored between the backup date and the reformat date will be lost.
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polymorphic
To change and restructure in multiple ways, so as to show a different signature and thus avoid detection. For instance, if you link-edit a large group of object modules, their order is not 100% critical as long as they're accessed at the proper entry point. So malware that changes the hash and the signature of the executable this way as part of its operation can be said to be polymorphic.
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It is a virus that stops your computer at startup. They are very effective because you cant turn on your computer to get rid of it.
Viruses. Dark Avenger created a Polymorphic (mutation) Engine which allowed viruses to duplicate themselves, each time modifying itself (mutating itself). This made it incredibly difficult for anti virus softwares to detect the virus, so much so that they needed to create a new technique in order to detect these Polymorphic (mutating) viruses.