Simbiot family
Description Simbiot family
These are memory resident parasitic viruses. They hook INT 21h and write themselves to the end of COM and EXE files that are accessed. The viruses have bugs and corrupt some COM files while infecting them, as a result these files halt the system.
"Simbiot.875,881" contain the strings:
>SimbioT<
[SLAM]
"Simbiot.878" displays the text:
HELLOS!
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Puf.581
Description Puf.581
It is a dangerous nonmemory resident parasitic virus. It searches for COM files except COMMAND.COM, then writes itself to the end of the file. On December, 30th it overwrites the AUTOEXEC.BAT with the instructions:
@echo off
echo PUFessional Anti-Windows Virus v1.2
PUFAWV12.COM
Then the virus creates the PUFAWV12.COM file and writes to there a program that halts the computer. The virus then reboots the computer.
Puke.393
Description Puke.393
It is not 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 and EXE files that are executed. It contains the text string:
[PuKE]
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