This is a very dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM files.
It is a stealth virus. It hooks INT 13h, 21h and writes itself to the end of COM files. It works on DOS 3.30 only because it inserts itself into the DOS data area. In cause of the another DOS the virus displays the message in Russian and erases the MBR. From the midnight till 4 o'clock it prints the screen. Sometimes it displays the long message in Russian and then erases the disk sectors.
