Virus Database

Lapiddan.457

Description Lapiddan.457

These viruses infect SYS files, and write themselves to the end of the file. The viruses stay memory resident as device drivers that are loaded into the system memory during DOS installation. To infect the files the viruses hook INT 21h.
The viruses do not change driver's Strategy and Interrupt addresses, but correct the NextDevice field - they save the offset of the virus code into there. As a result DOS loads any infected file as two different device drivers.
"Lapiddan.457" is a harmless memory resident parasitic virus, it does not manifest itself in any way. This virus contains the text string:
lapiddan

"Lapiddan.649,1137" on September 13th halt the computer and blink the screen and Num/Caps/Scroll Lock keys. They contain the texts:
"Lapiddan.649": [ESQUILO] by Xavirus Hacker * Programmed in Paraguay
"Lapiddan.1137": [XAVIER!] by Xavirus Hacker

"Lapiddan.1137" also drops the "Xav.Xavier.367" COM parasitic virus.

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Destructor.1150

Description Destructor.1150

These are not dangerous memory resident parasitic viruses. They hook INT 21h and write themselves to the end of COM- and EXE-files that are accessed. They contain the text strings:
"Destructor.1150": DESTRUCTOR V4.00 (c) 1990 by ATA
The Time is my!
"Destructor.2082": (C)'91 ATA

Depending on the system timer "Destructor.2082" manifests itself with a video and sound effects.

Detic.1514

Description Detic.1514

This is a relatively harmless, memory resident encrypted parasitic virus. It hooks INT 21h, and writes itself to the end of .COM- and .EXE-files that are executed, renamed or opened. After successful infecting of any file, the virus creates a C:(_FREE_D.) subdirectory, and tries to set the system date to March 23, 1977.
From the 13th until the 15th of any month, the virus also hooks INT 13h, and disables writing to the hard drive. On the 1st of any month, the virus outputs the word "zero" to the 9Bh port.
The virus contains the internal text strings:
[Friends] Virus V1.00
Virus Deticadet To My ExFriends.
Virus Written By [_Free_D.]
Made In ALBANIA.
C:COMMAND.COM
C:(_Free_D.)
IO

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