This is not a virus, but a very simple trojan written with Word macro language. As soon as you open an infected document, it attempts to format your hard drive.
FormatC is not common at all and it does not spread. It is not a problem and will probably never be.
F-Secure anti-virus products do not attempt to detect this trojan and we have no plans to add detection of 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.
Description Details: Mikko Hypponen, F-Secure