This virus infects EXE files when they are executed.
Enjoy activates on the 31st of October. At this time it displays this encrypted message:
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.
Disinfection & Removal
Description Created: Mikko Hypponen, F-Secure