F-Secure anti-virus products don't detect any virus by this name. However, the FS 'virus' is a special marker built in to VIRSTOP. Basically, if VIRSTOP reports FS virus, it means that VIRSTOP is not working correctly. Contact F-Secure anti-virus support for more information.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
More information on 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.