30 Examples of Computer Viruses

A computer virus is a type of malicious software program that spreads by inserting copies of itself into other programs or files. Viruses can self-replicate, damage hardware, software, or data, and interfere with computer operation.

ILOVEYOU Virus, Melissa Virus, Mydoom, Code Red, Blaster (MSBlast), Conficker, and Sasser are the most common examples of computer viruses.

Examples of Computer Viruses

Here are some common examples of computer viruses:

image showing Examples of Computer Viruses


The ILOVEYOU virus spread through emails. It was one of the first major phishing attacks. This virus tricked people with a fake love letter. It caused a lot of damage in 2000 by making computers lose important information and money.

2. Melissa Virus

Melissa was a macro virus that targeted Microsoft Word documents. It spreads through email attachments. It replicated itself by sending infected documents to the first 50 contacts in the victim’s address book.

3. Mydoom

Mydoom is a worm that spreads through emails. This virus attacked specific websites. It also opened a secret door, letting hackers control infected computers for planned attacks.

4. Code Red

Code Red was a worm that took advantage of problems in Microsoft Internet Information Services (IIS). It changed websites to say “Hacked by Chinese!” and made a group of infected servers.

5. Slammer (SQL Slammer)

Slammer used a problem in Microsoft SQL Server. It spreads very fast. It causes big problems on the internet in just a few minutes and stops important services.

6. Blaster (MSBlast)

Blaster took advantage of a problem in Windows. It made infected computers restart over and over and tried to stop people from updating their Windows.

7. Conficker

Conficker spread through problems in computer networks. This virus makes a big group of infected computers. It was hard to stop and stayed a danger for a long time.

8. Sasser

Sasser used a problem in Windows LSASS (Local Security Authority Subsystem Service). It causes infected systems to reboot continuously. It moved through the internet without needing people to do anything.

9. CryptoLocker

CryptoLocker was a virus that locked up files on people’s computers. It asked for money to unlock them. It shows how some viruses want to get money from people.

10. WannaCry

WannaCry took advantage of a problem in Windows and spread fast through networks. It asked for money in Bitcoin. It causing problems for organizations worldwide, like the NHS in the UK.

11. Nimda

Nimda, which spells “admin” backward. It was a virus that spread through emails, computer networks, and websites. It caused big problems by attacking many things at once.

12. Zeus (Zeus Trojan)

Zeus was a trick that stole important information, like passwords and bank details. It made a big group of infected computers to do financial crimes.

13. Stuxnet

Stuxnet was a very smart worm that aimed to break Iran’s nuclear program. It was a big deal because it showed that countries could use viruses in wars.

14. Storm Worm

Storm Worm was a trick sent through emails. It made a big group of infected computers for many bad things, including sending spam and launching DDoS attacks.

15. Sobig.F

Sobig.F spread through emails, causing a lot of problems. It took email addresses from infected computers to spread even more.

16. Bagle

Bagle was a family of worms that spread through email attachments. It established a backdoor on infected systems. It allows remote control and facilitates additional malware downloads.

17. Mimikatz

Mimikatz was a tool that stole passwords from Windows. It was a big danger because it could get important information.

18. Netsky

Netsky was a family of viruses spread through email. It often looked like an antivirus update, fooling people into opening the bad part.

19. IcedID

IcedID is a virus that steals bank information. It usually targets online banking. This virus is a big risk to people’s money and personal details.

20. Mirai Botnet

Mirai targeted Internet of Things (IoT) devices. It creates a powerful botnet for launching distributed denial-of-service attacks. It caused major disruptions in 2016.

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