Spyware worm is a term used to describe malware that has the ability to self-replicate without a host program and send information from a computer to a third party without the user's permission or knowledge.

Spyware worms spread using Windows networking APIs (Application Programming Interfaces), email, or by exploting vulnerabilities of the operating system or another application. They have identical spreading capabilities to Win32 worms but they also exhibit behaviour attributed to spyware.