Timer.2370
Description Timer.2370
It is not a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM and EXE files that are executed or accessed by DOS function FindFirst/Next FCB (the DIR command). On the 28st of any month the virus also hooks INT 1Ch and displays to the top right screen corner the current state of system timer (hours:minutes:seconds).
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Attack.3584
Description Attack.3584
It is a very dangerous nonmemory resident parasitic virus. It searches for .COM and .EXE files, as well as for C:DNDN.COM, C:MOUSE.COM, C:MOUSEMOUSE.COM, C:NCNC.EXE files, then writes itself to the end of the file. Depending on the system conditions the virus creates the C:DOSMBS.TXT file, erases the CMOS and disk sectors, displays the message:
mAsSiVe AtTaCk
Attention.394
Description Attention.394
It is a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of .COM files that are executed. While infecting, the virus writes 16 bytes of code and data to the file beginning :
+-----------------------------------------------------
¦JMP Loc_Virus¦A T T E N T I O N !¦1Ah¦ file
+-----------------------------------------------------
3 bytes 12 bytes 1 byte
While infecting, the virus hooks INT 24h, but does not restore its original value - this might hang the system.
The virus manifests itself upon infecting files on a write-protected disk in the A: drive: the motor is switched on (regardless what disk is being accessed). In infected files starting from the 4th byte you can find the string
ATTENTION !
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