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Details
Mr_Gu Family
These are memory resident parasitic viruses. They hook INT 21h and on ChDir DOS call (INT 21h, AH=3Bh) they search for COM files and write themselves at the end of the file. They contain the text strings:
*.com
Mr.Gu
Mr_Gu.545
It is not a dangerous virus, while infecting it changes the color of the screen border.
Mr_Gu.635
It is a harmless encrypted virus. It also infects COM files that are executed. It infects the COMMAND.COM file of only DOS version, the virus inserts itself into middle of that file, and file length does not grow. |
