Nik.442
Description Nik.442
These are memory resident parasitic viruses. They hook INT 1Ch, 21h and write themselves to the beginning of COM files that are executed. The viruses contain the text:
NIK
"Nik.442" is a dangerous virus, depending on its counter it corrupts the CMOS. "Nik.546" slowly turns off the screen by using the VGA features.
Check other viruses! Be aware! Use Antiviral Software
DoomMbr.406
Description DoomMbr.406
It is not a dangerous memory resident multipartite virus. It contains the text: "DOOM". It infects the MBR of the hard drive, boot sector on floppy disks, COM and EXE files. When an infected file is executed the virus infects the MBR of the hard drive and returns to the host program. While loading from infected disk the virus hooks INT 13h, waits for DOS loading process and hooks INT 21h. The virus then overwrites boot sector on floppy disks that are accessed. It also writes itself to the end of COM and EXE files when data&time stamp for these files is set (while copying to new files, for example).
Doomsday.715
Description Doomsday.715
These are not memory resident dangerous encrypted parasitic viruses which search for a .COM-files of a current directory and infect them by a standard manner. They contain the texts:
*.com
A scion to none
Certainly no fun
Total destruction when done
Introducing DOOMSDAY ONE
Written in Orlando, FL on 05/13/91
Sometimes they encrypt the contents of the logical sectors of the current disk and type:
Your disk is dead!
Long live DOOMSDAY 1.0
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