OM ("OfficeMacro") is a family name for all Microsoft Office Macro viruses. These are viruses which infect not only one Office application but several - for example, Word and Excel.
For example, if you're looking for the description of "O97M/Jerk", "OfficeMacro.Jerk" or "Macro.Office.Jerk" virus, see the description of "Jerk".
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.