Yanush.1467
Description Yanush.1467
This is a harmless non memory-resident encrypted parasitic virus. It searches for COM and EXE files in current and parent directories, then writes itself to the end of the file.
The virus contains a text string in Russian.
The virus does not manifest itself in any way.
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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.
Laplata.1809
Description Laplata.1809
It is not a dangerous memory resident stealth parasitic virus. It hooks INT 21h and writes itself to the end of COM and EXE files that are accessed. The virus also infects files that are being searched. It deletes anti-virus file ANTI-VIR.DAT, if it exists.
On 18 November the virus several times displays a text message.
The virus contains the text strings:
Virus La Plata v 2.1 (c) 9/97 Mean Mr. Mustard
> 19 de Noviembre - Viva La Plata <
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