WM/Sig is a simple macro virus which contains a macro called "signature". This virus is not widespread.
Sig activates by adding a single line saying "WIN" to the end of AUTOEXEC.BAT file.
[Katrin Tocheva, F-Secure]
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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