Virus Database

Windmill

Description Windmill

It's a memory resident not dangerous virus. It hooks INT 13h, 1Ch and infects Boot-sectors of the floppies. The original Boot-sector is stored at the last sector of the 360K floppy disk. This virus contains the internal text string: "WINDMILL Strain 2 Windmills in your mind..LLCPHP". Sometimes it manifests itself by the video effect: it scrolls the part of the screen and rolls the '-' character.
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Oddessy.602

Description Oddessy.602

It is a very dangerous memory resident overwriting virus. It hooks INT 21h and stays memory resident. On file executing the virus searches for .COM files in the current, parent directories and in "C:WINDOWSCOMMAND", and overwrites them.
On the 65th infection the virus erased the CMOS memory. The virus also manifests itself with a video effect and displays the message:
2001 ~ A viral Oddessy

Odehnal

Description Odehnal

These are very dangerous memory resident parasitic polymorphic and stealth viruses. They trace and hook INT 21h, stay memory resident and then write themselves to the end of COM and EXE files that are accessed. The viruses do not infect the anti-virus programs and several utilities:
AVG SYS SCAN CLEAN WIN TBAV PROT GUARD VS 286 386 DSK

When CHKDSK is run, the viruses disable their stealth routines. In some cases when listed above programs are executed, the viruses display the message and disable executing:
I don't like this program !

The viruses use anti-debug tricks. Under debugger they display the message and halt the computer:
BE CAREFUL !

Depending on their internal counters the viruses hook INT 9 (keyboard), corrupt the CMOS, display the message:
GRISOFT(c) SOFTWARE 1989,96

and manifest themselves with a video effect. If Ctrl-Alt-Del keys are pressed during effect, the viruses call disk formatting BIOS routine.
In some cases the viruses call the same effect routine, then they overwrite the MBR of the hard drive with a program that displays on booting:
CMOS-DEAD: DATA DESTROYED !

The viruses also contain the text string:
Hello Mr. Odehnal !

as well as:
"Odehnal.4792": EXECOM12/19/91
"Odehnal.5154": EXECOM06/12/95

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