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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Piter.708
Description Piter.708
It is a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of EXE files that are opened. The virus has a bug and corrupts the majority of files while infecting them. The virus contains the text:
Piter
Pivrnec.795
Description Pivrnec.795
It is a very dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of .COM files that are executed. On 10th of October the virus erases the disk sectors, decrypts and displays the message:
Mé jméno je Pivrnec a cht+l bych
Vám pod+kovat za poskytnutí
podmínek pot²ebn_ch pro moji
inkubaci a zdárn_ v_voj mé
osobnosti all!?...
Pivrnec `95
PS: Doufám, ºe Vás nep²e_la
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