Seacat is a very badly written virus full of bugs.
When an infected file is executed, the virus will infect the first COM file in the current directory. Virus will not check whether the file is already infected, so it will infect the same file over and over again. The virus will sometimes corrupt the infected file so that it can not be repaired. There is a text string inside the virus which says 'SeaCat'.
Virus will not preserve file attributes or the time and date stamp.
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.