Running this virus simulator makes different effect on MS-DOS 6.22 and DOSBox 0.73. In MS-DOS 6.22 it only scrambles letters without coloring and it's usually slow while in DOSBox 0.73 it's fast and colors are changing with additional effect.
Danooct1's vid demonstrating this virus: http://www.youtube.com/watch?v=wlW3nV0J30E
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Virus.DOS.Zohra is a memory resident parasitic encrypted DOS virus, written by Wintermute in...