Virus Database

Polonaise Family

Description Polonaise Family

These are not dangerous memory resident parasitic viruses. They hook INT 21h and write themselves to the end of EXE files that are executed or closed. When an infected file is opened, the virus disinfect it. Depending on the system time they play a music.
"Polonaise.812" infects COM and EXE files that are executed, it does not manifest itself in any way.
"Polonaise.812,2502" contain the strings:
WIZARD
!C

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Selectron Family

Description Selectron Family

These are not dangerous memory resident parasitic viruses. They hooks INT 21h and writes themselves to the end of COM ("Selectron.1800") or EXE files that are executed or opened. They contain the text strings:
"Selectron.1112": (C) Selectronics Software
"Selectron.1258": Digouter"01/15/88"
(C) Selectronics Software
"Selectron.1800": (C) Selectronics Software
Virus has been disabled.
Countdown to Extinctionall

"Selectron.1112" also hooks INT 8, 9. On Sunday when Alt-Ctrl-Del keys are pressed, it manifests itself with the video and sound effects.
"Selectron.1258" hooks INT 9, 10h, 1Ch. Under debugger is beeps with PC speaker and reboots the computer. When Alt-Ctrl-Del keys are pressed, it slowly turns the screen off by using VGA card features.
"Selectron.1800" is the encrypted virus. On Friday, 13th or depending on the host file name the virus displays:
Countdown to Extinction...

and manifests itself with the sound and video effects.

Semtex Family

Description Semtex Family

These are memory resident not dangerous viruses. They hook INT 8, 21h and write themselves to the end of .COM files that are opened or executed. Sometimes they fill the screen with random data. They contain the texts:
"Semtex.515,619,1000.a":
S E M T E X by Dusan Toman, CZECHOSLOVAKIA (7)213-040 or (804)212-23

"Semtex.686":
!!! explosive !!! S E M T E X !!! explosive !!!
Written by Dusan Toman, CZECHOSLOVAKIA Pyrotechnician Lilo Hedera
(7)213-040 or (804)212-23

"Semtex.1000.b":
S E M T E X by Dusan Toman, CZECHOSLOVAKIA *** Have a nice day ***

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