Computer Virus

A computer virus is a type of malicious software program ('malware') that, when executed, replicates by inserting copies of itself into other computer programs, data files, or the boot sector of the hard drive. The term 'virus' is also commonly, but erroneously, used to refer to other types of malware, including adware and spyware programs that do not have a reproductive ability.
On this page

Definition

A computer virus is a malicious program designed to cause damage, disrupt operations, steal data, or otherwise negatively impact the computer or device it infects. Unlike other types of malware, a virus requires user intervention to initiate its spread by executing the infected file or software.

Examples

  1. ILOVEYOU Virus: One of the most destructive viruses ever, spread through email as a love letter and affected millions of computers worldwide.
  2. Melissa Virus: A macro virus that targeted Word documents, it spread through email attachments and caused considerable damage by disrupting email services.
  3. Conficker: This virus targeted Microsoft Windows operating systems and created a botnet of infected computers, which was then used to steal data and execute further cyberattacks.

Frequently Asked Questions (FAQs)

What is the difference between a virus and other malware?

A virus is a specific type of malware that replicates by inserting copies of itself into other programs. Other types of malware include worms, which can spread without user action, and trojans, which disguise themselves as legitimate software.

How do viruses spread?

Viruses can spread through infected email attachments, downloading infected files from the internet, or using infected USB devices. They often rely on user action to activate and propagate.

What are the common signs of a virus infection?

Common signs include a slow computer, frequent crashes, unexpected pop-up messages, and programs opening or closing on their own.

How can I protect my computer from viruses?

Use reputable antivirus software, keep your operating system updated, avoid opening suspicious email attachments, and download software only from trusted sources.

What should I do if my computer is infected?

If infected, disconnect from the network to prevent the virus from spreading, run a full system scan using antivirus software, and follow the recommended steps to clean the infection.

  • Malware: Any software intentionally designed to cause damage to a computer, server, client, or computer network. It includes viruses, worms, trojans, ransomware, and spyware.
  • Worm: A standalone malware that replicates itself to spread to other computers, typically without any human intervention.
  • Trojan Horse: A type of malware that disguises itself as a legitimate file or application to trick users into downloading and executing it.

Online References

Suggested Books for Further Studies

  • “The Art of Computer Virus Research and Defense” by Peter Szor
  • “Viruses Revealed” by David Harley, Christopher C. Warren, and Robert Slade
  • “Malware Analyst’s Cookbook and DVD: Tools and Techniques for Fighting Malicious Code” by Michael Ligh, Steven Adair, Blake Hartstein, and Matthew Richard

Fundamentals of Computer Virus: Cybersecurity Basics Quiz

Loading quiz…

Thank you for exploring the intricate world of computer viruses through this comprehensive article and engaging with our challenging quiz. Keep pushing forward in your cybersecurity journey!

Department of Veterans Affairs (VA)