Form
aka Form 18
- discovered
- 1990
- origin
- Switzerland
- reported by
- various
- author
- unknown
- family
- Form
- size
- 512 bytes
- platform
- DOS boot sector
- vector
- Floppy and hard disk boot sectors
- payload
- boot sector, audio
- trigger
- 18th day of the month
Payload
On the 18th of any month, produces a soft click from the PC speaker on every keystroke. Otherwise dormant. Was the most reported virus of the early 1990s.
~ writeup coming soon ~
Related specimens
Sources
- Internet Archive Malware Museum: Form :: Mikko Hypponen, Internet Archive Malware Museum
last updated: 2026-04-12 :: curated by the_curator