This is a destructive virus which was reported to be heavily in the wild in Israel in early 1996. It was also found in the wild in Finland in December 1996.
The virus activates on random dates. When this happens, it will display this text and overwrites drive C:
Alfons ! Synchronizing drive C: (Do not interrupt this operation !): 100% Done.
A later, 1536 byte variant is also known.
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.