This is a complicated stealth virus, which infects files when they are accessed. Occasionally the virus displays this message:
ALPHA STRIKE Advanced Tactical Viral Implant by NEUROBASHER'93 / Germany
See: Tremor, Nightfall, Neuroquila.
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.