Class Virus
Platform DOS

Technical Details

It is a dangerous memory resident parasitic stealth virus. It
hooks INT 20h, 21h, 27h, 28h, 2Ah, 2Fh and writes itself to the end of COM
and EXE files that are accessed. Depending on the system date it deletes
the files instead of infecting them. It contains the text string:

Night Knight!

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