Virus Database

EnolaGay.1183.a

Description EnolaGay.1183.a

It is a harmless memory resident parasitic virus. It hooks INT 21h, 27h, 2Fh and writes itself to the end of COM- and EXE-files that are closed, if they have been opened for writing (while copying, for example). Being installed into the system memory the virus can move its TSR copy and append it to the code of programs that stays TSR by using DOS call Keep (INT 21h, AH=31h, or INT 27h).
The virus contains the internal text strings:
Enola Gay ver.2.01 (C) 1994 by HPR Lab.
Accidents newer happenall

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Mr_Gu Family

Description 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.

Mr_Twister

Description Mr_Twister

It is a harmless nonmemory resident parasitic virus. It searches for .COM files and writes itself to the end of the file. It contains the text string:
Mr. Twister 1994,1

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