Top 10 Computer Viruses

Top 10 Computer Viruses

Living viruses like the flu are difficult enough to deal with, but now in the computer age we also have to deal with computer viruses on a regular basis. Here are 10 notable computer viruses.

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1. Storm Virus

Early in 2007 there was a mass e-mail sent with the subject line, “230 dead as storm batters Europe.” The link included in the e-mail took users to an infected site where the virus was downloaded with nearly a million computers being infected. The virus is dangerous and still a huge security risk to users today with sneaky “tech-support” or online porn and celebrity photo links. Even some E-cards!

2. Sasser Virus

What could take down the British Coast Guard, Agence France-Presse, Delta Airlines, and a smattering of universities, hospitals, and large corporations? You know, the typical German 17-year-old teenager. Sven Jaschan didn’t serve any jail time for his global take down, but he was sentenced to 21 months of probation and community service. Nothing like a little slap on the wrist to fix a global catastrophe!

3. Nimda Virus

The top virus in 2001, Nimda, or “admin” spelled backwards, became the most widespread virus on Earth in 22 minutes. Spread through emails, websites, and server vulnerabilities, the virus had a special sense of fear since it hit only a little after the September 11 attacks.

4. Melissa Virus

A new virus for the e-mail age, the Melissa virus took advantage of email attachments and took viruses to a new level by introducing using your address book to send itself to all your other contacts. The viruses creator, hacker David Smith, said he wrote the virus for a stripper he met in Florida.

5. Code Red I and II

Making its move in 2001, the Code Red viruses attacked more than 200,000 servers. The virus was a particularly sneaky and dangerous because all it required to infect and enslave your computer was an active Internet connection and a flaw in the Windows operating system. The virus attempted to overload the White House computers with its new drone computers, but was barely unsuccessful.

6. Morris Computer Virus

An “experiment” at the start, the Morris worm was distributed by Robert Tappan Morris to gauge how big the new born internet was in 1988. Just like living viruses though, the Morris worm took on a life of its own and got way out of control. It spread to 6,000 university and government computers and slowed them down and crash. Morris was convicted and fined, but didn’t serve any time.


The ILOVEYOU virus sent users an e-mail with an attachment labeled as a love letter. If you were excited or even just curious and opened the attachment, the virus would replicate itself on the computer’s hard drive and downloading a password-stealing application from the Internet. Billions of dollars in damage have been estimated worldwide.

8. Brain Computer Virus

A fairly simplistic virus, the Brain targeted PCs in 1986 with Microsoft’s DOS operating system. The virus used up large chunks of memory causing computers to display a warning message about the infection, and even giving you a number to have it disinfected. The number was for two brothers in Pakistan who had developed the virus code, meant to act as copy protection for their medical software, but the code was stolen and used for less innocent means.

9. Conficker

Nobody was sure what the Conficker virus would do in late 2008, because it didn’t seem to be doing anything at all. Conficker was collecting an army of computers, or a botnet. The virus began having infected computers contact specific sites on certain days, but why nobody really knows.

10. Elk Cloner

In 1982, ninth-grader Richard Skrenta wrote a virus that targeted Apple II personal computers. What did the virus do? Every 50th time the computers booted up they displayed a poem. While rather innocent it was groundbreaking in its time – and all started by a high-schooler.

A relatively new problem, many of us have a difficult time remembering when we didn’t have to deal with computer viruses. From humble high school beginnings to dangerous security risks, computer viruses are likely to stay and only get more sophisticated.