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But the main danger lies in the polymorphic viruses which is very difficult to spot a polymorphic virus which spreads and morphs easily over the internet and through USB sticks," said Nemec.
Polymorphic virus A virus that can change its byte pattern when it replicates, thereby avoiding detection by simple string-scanning techniques.
In order to obtain the ICSA On-Demand/On-Access Anti-Virus Product Certification on Windows 2000 systems, AntiVirus Expert needed to detect 100% of the viruses currently known to exist "in-the-wild", as well as, detect 100% of the ICSA Lab's test suites, which included a polymorphic virus test set and those viruses known to be common infectors and have yet to be named to the WildList.

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