Screen.600
Description Screen.600
It is not a dangerous memory resident parasitic virus. It hooks INT 9, 21h and writes itself to the end of COM files that are executed or opened. When Alt-Ctrl-Del keys are pressed, the virus "shakes" the screen.
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DogPaw.720
Description DogPaw.720
It is a dangerous memory resident parasitic stealth virus. It hooks INT 21h and writes itself to the beginning of .EXE files that are closed. On opening an infected file the virus disinfects it, and then infects on closing. The virus has a bug and in some cases halts the computer. The virus contains the encrypted text:
DogPaw JxQ/29A
Donbass.444
Description Donbass.444
This is a harmless non memory-resident encrypted parasitic virus. It searches for the COMMAND.COM file, then for COM files of the current directory, then writes itself to the end of the file. The virus contains the text string:
Donbass3 COMSPEC= *.COM
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