Infected programs will either grow by 1090 or 1134 bytes, depending on their previous size. The virus activates on October 23rd of any year, displaying the message "Karin hat GEBURTSTAG".
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.