
1) Exploit-based worm
Found on
https://www.crosswordclues.com/clue/nimda

Nimda is a computer worm, also a file infector. It quickly spread, surpassing the economic damage caused by previous outbreaks such as Code Red. Nimda utilized several types of propagation techniques and this caused it to become the Internet’s most widespread virus/worm within 22 minutes. The worm was released on September 18, 2001. Due to the r...
Found on
http://en.wikipedia.org/wiki/Nimda

The Nimda worm is a worm that spreads itself through various means, including email, and infects local files and files on network share on Windows 95, Windows 98, Windows ME, Windows NT and Windows 2000 platforms. Nimda attacks IIS http servers and also seeks backdoors left by Trojans such as Sadmind and Code Red.
Found on
http://www.probertencyclopaedia.com/L51.HTM
No exact match found.