This virus infects the same file over and over until it become too large to fit in memory. It traps INT 9 (the keyboard interrupt) and when CTRL-ALT-DEL is pressed it will display the message:
DID YOU EVER DANCE WITH THE DEVIL IN THE WEAK MOONLIGHT ? PRAY FOR YOUR DISKS!! The Joker
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
More scanning & removal options
More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.
You may also refer to the Knowledge Base on the F-Secure Community site for more information.
The virus also monitors any keystrokes, activating when 2000 are reached. It will then change the colors of any text displayed on the screen. When 5000 keystrokes are reached the virus will trash the first copy of the FAT.