When an infected program is run, it will search the whole directory structure of the disk and infect almost every COM-program on disk. This takes time, so Omega is easy to find because programs take much more time to load.
Omega won't infect a file if it is marked read-only.
Omega will activate on every Friday the 13th. It then displays an omega-character ('O') and overwrites the beginning of the first two hard disks in the system, destroying the partition records.
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.