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.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
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