Virus.DOS.Pizelun [Pizelun DOS Virus]

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Pizelun is a memory resident parasitic encrypted virus.

It hooks INT 21h (DOS Function Dispatcher) and writes itself to the end of .COM and .EXE files that are accessed. On DOS it calls the GetDir function and searches for files and infects them.

In May of 1995 it hooks INT 8 (System Timer), 10h (Video BIOS Services), and 15h (System BIOS Services) and manifests itself in different ways
1. Makes the Num/Caps/ScrollLock indicators blink
2. Changes the label of the hard drive to "Pizelun"
3. Inverts the color palette
4. Lower-cases all text that is displayed
5. Intercepts Ctrl+Alt+Delete to run a video effect

It displays the message :
PIZELUN attivato, attivatissimo!
Premere un tasto per continuare . . .

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