Russian Virus 666
There is no virus by this name.
However, it is mentioned in a US Army academic journal:
"...computer virus capable of affecting a person's psyche is Russian Virus 666. It manifests itself in every 25th frame of a visual display, where it produces a combination of colors that allegedly put computer users into a trance. The subconscious perception of the new pattern eventually results in arrhythmia of the heart."
This is nonsense, ignore it.
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.