This virus infects EXE files when they are executed.
Enjoy activates on the 31st of October. At this time it displays this
Welcome to the ultimate computer virus! This program is not
destructive so I hope you'll enjoy it. But don't think this
was it now... The evolution goes on!
Otherwise, Enjoy does nothing but replicates.
Enjoy was found in the wild in Netherlands in June 1996.
[Analysis: Mikko Hypponen, F-Secure]