Computer Worm
What is Computer Worm?
Computer WormSelf-replicating malware that propagates across networks autonomously, without requiring a host file or user interaction.
A computer worm is malware that spreads by exploiting network services, open shares, or unpatched vulnerabilities, copying itself from system to system without needing to attach to a host program. Worms can saturate links, degrade services, deliver secondary payloads like ransomware or backdoors, and reach internal systems that are not directly exposed to the internet. Famous outbreaks include Morris (1988), SQL Slammer (2003), Conficker (2008), and WannaCry (2017). Defences include rapid patching of network-facing services, disabling legacy protocols (SMBv1, weak RDP), network segmentation, egress filtering, and detection of unusual lateral traffic patterns.
● Examples
- 01
WannaCry, a ransomware worm exploiting EternalBlue in SMBv1.
- 02
Stuxnet, a worm that targeted Iranian centrifuges via USB and network paths.
● Frequently asked questions
What is Computer Worm?
Self-replicating malware that propagates across networks autonomously, without requiring a host file or user interaction. It belongs to the Malware category of cybersecurity.
What does Computer Worm mean?
Self-replicating malware that propagates across networks autonomously, without requiring a host file or user interaction.
How do you defend against Computer Worm?
Defences for Computer Worm typically combine technical controls and operational practices, as detailed in the full definition above.
What are other names for Computer Worm?
Common alternative names include: Network worm, Internet worm.