This is an encrypted resident infector of EXE files. It infects files when run and also stays resident and infects when other files are accessed. Amount of free memory is not decreased.
Virus contains this text:
CLAWS (C)1994-95 WereWolf
Virus is encrypted with a variable 32-bit key. It deletes checksum databases belonging to several different antivirus packages.
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.