Virus.DOS.Ha1 [Ha1 DOS Virus]

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Ha! Version A

Details :
Ha1 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 executed.

The virus contains the text string:
ha! version A

On 8th of any month, it also hooks INT 16h (Keyboard) and exchanges the symbols '!' and Space when they are entered.

On 16th of any month, this virus hooks INT 9 (Keyboard) and when Alt-Ctrl-Del keys are pressed, the virus displays its payload

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