A computer worm is a standalone malicious program that replicates and spreads automatically across networks, without needing to attach to a host file or require user interaction.
Characteristics:
- Self-replicating and autonomous.
- Spreads rapidly through network vulnerabilities, email, or messaging services.
- Can consume bandwidth, slow systems, or install backdoors for further attacks.
Example:
The WannaCry worm (2017) exploited a Windows vulnerability and spread globally, encrypting data and demanding ransom.