This is a simple boot sector virus. Note that unlike most other boot
viruses, Chance infects the DOS boot record (not the MBR) on the
hard drive.
Chance activates on the anniversary of John Lennon's death (December
8th), plays a part of the Lennon-McCartney song 'Give Peace a Chance' and
displays this text:
All we are saying is give peace a chance (J. Lennon)
Chance was reported in the wild in USA and Canada in December 1995.