This is a small and tricky boot sector virus.It spreads like a typical boot virus: if only infects a hard drive if you boot with an infected floppy in drive A:. After that it will infect all floppies that are accessed in the machine.The code of the virus contains several little tricks, and it seems to be written by an experienced programmer.
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.
On floppy disks, the virus formats an extra track and stores the original boot sector there. On hard drive, the original MBR is stored on sector 8.The end of the virus contains this unencrypted text which is never displayed:
SPIRIT (c) MW
Spirit does nothing besides replicating.Spirit was reported to be in the wild in the Netherlands in March 1996 and in the USA and Finland in April 1996.
Technical Details: Peter Szor, F-Secure, 1996