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Hard is a memoey residenr parasitic virus. It hooks INT 21h, and writes itself to the end of .COM files that are executed. On Monday, at 6 p.m., it displays the text “It’s hard days night!” and then erases the 50 first sectors of all logical drives.

Virus.DOS.Hard_-Hard_DOS_Virus-

Virus.DOS.Hard -Hard DOS Virus-

Video of Hard (DOS Virus) in action


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