MS-DOS

Polyboot.B is a boot virus that does not have any destructive effects, which infects the boot sector of hard disks (Master Boot Record or MBR) and floppy disks (Boot).

Polyboot.B goes memory resident in order to infect the MBR of the hard disks in the infected computer and the Boot of the floppy disks used.

Once the computer is infected, Polyboot.B infects all floppy disks used in the computer, provided that they are not write-protected.

The only indication that Polyboot.B has infected a computer is that it has problems starting.