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
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
More information on 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.