OK Retro, thanks for this link.
Anyway: You can't fool me. THIS IS NOT A VIRUS but it does absolutely no harm. Info file says that SystemZ can detect SCA and ByteBandit viruses, which means that it just writes a clean boot block if ByteBandit or the like is in the boot block.
Can this do any harm?
Methinks not. During my active Amiga period, I've seen SystemZ on AmigaDOS disks ONLY. This means that NO CUSTOM LOADER is destroyed if SystemZ detects a ByteBandit or similar virus.