Jerusalem
aka 1813 / Friday the 13th / Israeli / Hebrew University
- discovered
- 1987-10
- origin
- Jerusalem, Israel
- reported by
- Hebrew University of Jerusalem
- author
- unknown
- family
- Jerusalem
- size
- 1813 bytes
- platform
- DOS
- vector
- COM and EXE files
- payload
- destructive, visual
- trigger
- Friday the 13th
Payload
On any Friday the 13th, deletes every executable file the user runs. Also slows the system noticeably and produces a black box on screen.
~ writeup coming soon ~
Related specimens
Sources
- Internet Archive Malware Museum: Jerusalem :: Mikko Hypponen, Internet Archive Malware Museum
last updated: 2026-04-12 :: curated by the_curator