The number of email viruses and attacks skyrocketed in 2001, causing security experts and vendors to dub it "the year of the virus" (IDG News Service, Jan. 02; silicon.com, Dec. 01). One new factor to emerge in 2001 was that virus-writers are using increasingly complex and sophisticated techniques in their bid to circumvent anti-virus software and disseminate their viruses. A case in point was the notorious Nimda virus that used multiple methods to spread itself and was based on an exploit rather than on the virus/Trojan behavior that anti-virus products typically search for. Email security tools must become more sophisticated if such threats are to be blocked before they can cause harm. Anti-virus software, though essential, cannot combat such threats; an email exploit detection tool is also necessary.
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