B infects the boot records of diskettes and the Master Boot Records of hard disks.
B can infect hard disks only during a diskette boot.
B uses stealth techniques, so the changes the virus has made cannot be detected while it is active in memory. After this, the virus crashes the computer, simulating a genuine error situation due to faulty memory circuits. B virus have lately popped up in several parts of the world. The virus seems to be especially common in Germany, probably because the virus infected a cover-disk distributed by one of the biggest German computer magazines in late 1994.