KbrBug.895
Description KbrBug.895
These are harmless memory resident encrypted parasitic viruses. They hook INT 1, 3, 1Ch, ACh and write themselves to the end of COM (except COMMAND.COM), EXE and OVL files. The viruses make a patch of original INT 21h handler - they insert interrupt call ACh into original INT 21h code, and set INT ACh vector to the address of the virus body.
These viruses do not infect the files for a few days after infection of the system. Periodically they call the trigger routine that jokes with the keyboard by changing the keyboard buffer address and filling the buffer with a "dust".
"KbrBug.895" is not such complex: it hooks only INT 1Ch, 21h and does not infect EXE files. Sometimes this virus exchanges the digits '0' to '9' on the screen.
"KbrBug.2662" also hooks INT 8, 10h and manifests itself with some video effects.
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Macro.Word97.Box
Description Macro.Word97.Box
This stealth virus contains one module "SLOT" which contains seven macros: autoclose, autonew, autoopen, box1, SK, toolsmacro, killer.
The virus replicates itself on opening and closing documents. Depending on the current date and the random counter it displays MessageBoxes (non-English).
Macro.Word97.Bptk
Description Macro.Word97.Bptk
This is a rather humerous Word macro-virus. The virus macro Document_Open only infects the system macros area and current document upon opening. The virus manifests itself with the Russian text "ÁÏÒÊ".
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