Lapiddan.45
Details
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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