It's a harmless memory resident boot virus. It hooks INT 13h and writes itself to MBRs of hard drives and boot sectors of floppy disks. It contains text strings:
THIS PROGRAM WAS WRITTEN IN INDIA.(c)1993 FAT AVENGER PS. this program is not meant to be destructive
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 scanning & removal options
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.