
Computer viruses are a nuisance in our lives. They have caused a lot of troubles and making our lives difficult. Now let's find out which are top 10 computers viruses ever, as complied by news.com.au.
1. Jerusalem (1987)
Known as one of the most successful and earliest viruses ever, this virus dubbed as Jerusalem, activated each year on Friday the 13th. It displayed a message or deleted any programs that ran on the day. The virus installed itself in the target computer's memory when an infected file was opened.
2. Stoned (1987)
The Stoned or Marijuana virus became widespread in the early 1990s. It was the most successful virus in terms of number of infections, infiltrating hard drives and the boot sector of floppy disks. The most common effect was to display a message that read: "Your PC is now stoned. Legalise marijuana." There are more than 90 variants of the virus, which miraculously resurfaced last year.
3. Tequila (1991)
Tequila uses stealth techniques in order to avoid detection. It is said that Tequila is extremely dangerous as it couldn't be removed from the computer's memory. What Tequila does is that it infects computers by writing an unencrypted copy of itself to sectors of the system’s hard disk and modifying the master boot record.
4. Michelangelo (1991)
Michelangelo was a sleeper. Discovered in 1991, it spread quietly for months - the virus finally activated and became lethal. It started to destroy data on tens of thousands of computers by overwriting parts of the hard disk with random data.
5. ILOVEYOU (2000)
Dubbed as the most lethal worm of all time, ILOVEYOU disguised itself as a romantic message to the recipient that, if opened, it would send itself to everyone in the user's address book. ILOVEYOU reached up to 45 million people in one day, causing more than $5 billion in damage and clogging email systems from the Pentagon to British Parliament.
6. Monopoly (2001)
Similar to ILOVEYOU, the Monopoly worm sent itself by email boasting "proof" that Microsoft boss Bill Gates was guilty of monopoly. The worm was delivered through an attachment called "Monopoly.vbs" that, when opened, displayed an humorous image of Bill Gates on a Monopoly game board. It then attempted to mass-mail itself to all of the user's Outlook contacts.
7. AnnaKournikova (2001)
This worm leveraged on the popularity of tennis star AnnaKournikova. AnnaKournikova was short-lived and spread via Outlook email with the subject line "Here you have, ;o)", with an attachment called AnnaKournikova.jpg.vbs. Once opened, the worm copied itself to the Windows directory and sent the file to all contacts in the user's Outlook address book.
8. Nimda (2001)
Nimba uses a new method to spread its worm - via server-to-server web traffic, infecting shared network hard drives and downloading itself to users who were browsing websites hosted on infected servers.
9. Sasser (2004)
The Sasser worm is amazingly created by a German teenager, boasting that his worm could spread without user intervention. Well this has caused much disruption worldwide because of this worm - halting Australia's Railcorp trains as operators couldn't communicate with signalmen and forcing the cancellation of 40 Delta Air Lines trans-Atlantic flights. In Taiwan, over 400 post office branches were forced to revert to using pen and paper.
10. Storm (2007)
Classed as "superworm", this virus constantly morphs into new forms and finds ways to exploit people's weaknesses. In 2007 it infected thousands of computers by masquerading as an email about a weather disaster, and then mutated and spread with another fake attachment infecting 10 million computers.
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