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.
Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.
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See the manual for your F-Secure product on the Help Center.
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