This virus stays resident in memory and infects EXE files when they are executed.
Uddy activates when an infected program is executed after the first of January, 1998. At this time the virus overwrites part of the hard drive with text "UDDY UDDY UDDY", then displays "UDDY" on screen and hangs the machine.
Uddy.2617 was reported to be in the wild in USA in April 1996.
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 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.