What is a Worm

Definition of a Computer Worm

A computer worm is a type of malicious software program (malware) designed to replicate itself and spread across computers and networks without needing to attach itself to an existing program. Worms are often used by attackers to exploit vulnerabilities, causing harm such as stealing data, consuming system resources, or creating backdoors for further attacks.

How Do Worms Work?

Worms typically spread by exploiting security vulnerabilities in operating systems, applications, or network protocols. Once a worm infects a computer, it uses that system to seek out other vulnerable systems and replicate itself, continuing the cycle.

Common Examples of Worms

• Morris Worm: One of the first worms to gain widespread attention in 1988, it caused significant damage to early internet systems.
• ILOVEYOU: A worm that spread through email attachments, causing billions of dollars in damage worldwide in 2000.
• Conficker: A worm that infected millions of computers in 2008, exploiting vulnerabilities in Windows systems.

Protecting Your System from Worms

To protect your system from worms, consider the following measures:

• Keep your operating system and software updated with the latest patches.
• Use reliable antivirus and anti-malware software.
• Avoid clicking on suspicious links or downloading unknown files.
• Implement a firewall to block unauthorized access to your network.
• Educate yourself and others about common cyber threats.