This is a nondangerous virus. It infects in a “Brain” way
Boot-sectors of floppy disks during an access and MBR of the hard disk on a
reboot from an infected floppy disk. The virus produces the “falling
letters” effect (the code is copied from the “Cascade” virus). The virus hooks INT 13h and contains the text “(c) Copyright 1990 Keydrop inc.”.