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computer virus & antivirus

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                                virus

• an computer virus  is infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.
• The first IBM PC virus in the wild was a boot sector virus dubbed (c)Brain, created in 1986 by the Farooq Alvi Brothers in Lahore, Pakistan, reportedly to deter piracy of the software they had written.

     the worst computer virus are 

• 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.

• 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.This was another virus that exploited a user’s Microsoft Outlook mail contacts. The email subject read: "Hi: Check This!", with what appeared to be a picture file labeled "AnnaKournikova.jpg.vbs". Clearly, the attachment was not a JPG, but it was a good bit of social engineering and was an effective transmission mechanism.

• 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.

The reason that MyDoom was effective was that the recipient would receive an email warning of delivery failure – a message we have all seen at one time or another. The message prompted the recipient to investigate thus triggering the worm.

Once the attached file was executed, the worm would send itself to email addresses found in the local address book and also put a copy in a shared folder (KaZaA). Like Klez, MyDoom could spoof email but also had the ability to generate traffic through web searches, which placed a significant load on search engines like Yahoo and Google.

MyDoom was also significant for the second payload that it carried, which was a DDoS attack on the SCO group; albeit not the coordinated sort of attack we would now expect to see with modern bot-nets. The origination of the virus is attributed or suggested to be someone in Russia, but no one was ever able to confirm

• 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.

Netsky sticks in my mind because it was the first time that a virus insulted other virus authors. Here the authors of both the Bagle and Mydoom worm families were dissed and, in some cases, Netsky included code that removed versions of the competing viruses.

The other reason this one sticks with me was that the author was turned in to authorities by a friend who wanted to collect the $250,000 bounty that Microsoft put up for information about the outbreak. Though obviously, not a really good friend!

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