AntiCMOS.B is a boot virus. It was isolated in mid-1995. Like AntiCMOS.A, AntiCMOS.B became common worldwide. However, this variant never reached the success level of the original, and is now considered obsolete. Infected floppy disks contain the following text:
Additionally, AntiCMOS.B attempts to play a tune, but this fails due to coding errors [1]. AntiCMOS.B is otherwise a typical boot virus, much like its predecessor.
AntiCMOS.C is a boot virus and very minor variant of the AntiCMOS family. Unlike AntiCMOS and AntiCMOS.B, AntiCMOS.C remained in the field for a very short period of time, and is now considered entirely obsolete.
"Seen in the wild in 2020". https://twitter.com/SwiftOnSecurity/status/1296600869564186624 ↩