Jd Family
Description Jd Family
These are memory resident parasitic viruses. They copy themselves to the system memory at the address 0043:0100, hook INT 21h and write themselves to the end of COM files that are executed or opened.
Some of these viruses detect their already installed TSR copy with "Are you here?" call (INT 21h, AX=3FFFh), the TSR part returns 4A44h ('JD') in AX register.
Sometimes "Jd.448,460" delete the files instead of opening them.
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FOG.AirRaid.330
Description FOG.AirRaid.330
This is a harmless memory resident parasitic virus that uses FOG engine. It hooks INT 21h and writes itself to the end of COM files that are executed. It contains the text string:
Air Raid
Folko.512
Description Folko.512
It is a harmless nonmemory resident parasitic virus. It searches for .COM files, then writes itself to the end of the file. While infecting a file the virus uses undocumented System File Tables. The virus does not manifest itself in any way, it contains the string:
Folko
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