1. Melissa
A macro virus named after a Miami stripper, was so effective in 1999 that the tidal wave of email traffic it generated caused the likes of Intel and Microsoft to shut down their email servers. The virus contained a Word document labeled List.DOC as an attachment to an email allowing access to porn sites.
2. The Anna Kournikova Virus
This computer virus was attributed to a Dutch programmer Jan de Wit on February 11, 2001. The virus was designed to trick a recipient into opening a message by suggesting that it contained a picture of the lovely Anna Kournikova, instead the recipient triggered a malicious program.
3. MyDoom
MyDoom began appearing in inboxes in 2004 and soon became the fastest spreading worm ever to hit the web, exceeding previous records set by the Sobig worm and ILOVEYOU. A side note, though I knew people affected by Sobig and ILOVEYOU, I did not see either of these in the wild.
4. Sasser & Netsky
Easily one of the most famous and prolific variants of computer worms, famous for effectiveness and the fact that it was authored by an 18 year-old German, Sven Jaschan, who confessed to having written these and other worms.
5. 2007 Storm Worm
Though I did consider the 1988 Morris worm, regarded as the first worm, I had to go with the 2007 Storm worm as the 5th to include. Known by many names the Storm Worm is a backdoor Trojan that affects Microsoft based computers.
=> It's very hard to advice you any antiviruses because none of us use a licensed one but if you can afford it...fine go for it.
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