WM/Munch is a simple Word macro virus.
Beside replication, the virus has a payload that activates either in every month's 9th day or every day in September depending on the date format settings selected in the Control Panel. It is also possible that the payload does not activate at all in some configurations.
However, when the payload activates, the virus shows only the following text in the status line:
Whose turn is it to get the munchies in?
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
More information on the 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.