FFFF.440
Description FFFF.440
This is a dangerous memory resident parasitic virus. It copies itself into the Interrupt Vectors Table, hooks INT 21h and writes itself to the end of COM files that are executed. It contains the hexadecimal word FFFFh at its beginning.
Depending on the system date the virus manifests itself with some video effect.
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Bobas.754
Description Bobas.754
These are dangerous memory resident parasitic viruses. They hook INT 9, 21h and write themselves to the end of EXE files that are executed or opened. Depending on their internal counters the viruses display the messages and corrupt the CMOS:
"Bobas.754": VIRUS :BOBAS v1.1
"Bobas.814": VIRUS :BOBAS v1.2
Bobby.513
Description Bobby.513
This is a somewhat-dangerous, non-memory resident parasitic virus. It searches for .COM files, then writes itself to the end of the file. Because of a bug, the virus corrupts files with lengths that are divisible by 100h (256). On Fridays, the virus displays a message in Russian. It also contains the text:
Bobby Friday.
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