This is a simple virus with an uncommon activation routine: on some machines, it turns the the BIOS boot-up password on and changes the password to 'monica'.
Do not confuse this virus with Monika.686, which is a totally different virus.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.
You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.
Description Details: Mikko Hypponen, F-Secure