Virus Database

Strategy.486

Description Strategy.486

It is a harmless nonmemory resident parasitic virus. It infects the system drivers (SYS files) only. The virus receives the control only when DOS is loading the system drivers that are listed in the CONFIG.SYS file, and only if an infected file is in the list of the system drivers. The virus gets the control, opens the CONFIG.SYS file, searches for "DEVICE=" string there (any-cased), and infects the file that is pointed by this string. Being executed the virus infects all drivers that are listed in the CONFIG.SYS.
While infecting a file the virus checks the file internal format and does not infect EXE drivers. Then the virus stores and modifies the address of Strategy routine and writes itself to the end of the file.
The virus does not manifest itself in any way. It contains the string
CONFIG.SYS

and the name of the host file.

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NightFreddy.938

Description NightFreddy.938

This is a very dangerous memory resident parasitic virus. It hooks INT 21h, and writes itself to the end of .COM files that are executed or opened. In August, it erases the MBR of the hard drive and corrupts the CMOS. The virus code contains a branch that is never summoned, and this code decrypts and displays the following message:
I'm Freddy, your nightmare

NightKing.1568

Description NightKing.1568

It is a very dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM and EXE files (except AVG.EXE) that are executed or opened. While infecting a computer the virus stores the current time in the MBR of the hard drive, and one month after infecting the virus reads to the memory the FAT of the C: drive, then corrupts the FAT, displays the message:
+-----------------------------------------------+
¦ Hello dear friend, your computer is attacking ¦
¦ by NIGHT KING I. virus. If do you like your ¦
¦ data very much, don't reset your computer ¦
¦ before midnight ! ¦
+-----------------------------------------------+

then the virus waits till midnight and restores the corrupted data. If the computer is rebooted before midnight the FAT is lost.

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