YZ Family
Description YZ Family
These are very dangerous memory resident parasitic viruses, "YZ.1339" is an encrypted virus. They hook INT 21h ("YZ.1230" also hooks INT 1Ch) and write themselves to the end of COM and EXE files that are executed. On March 8th they erase the disk sectors and display the message:
It is my birthday!!!
"YZ.1230" does that at 15:00, "YZ.1339,1434" - while infecting a file. "YZ.1339,1434" also beeps by PC speaker.
The viruses contain the ID word:
YZ
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Junkie.1308
Description Junkie.1308
This is a memory resident multipartite encrypted very dangerous virus. It hooks INT 13h, 1Ch, 21h and writes itself to the end of COM files that are executed or opened, and floppy boot sectors while reading from floppy and MBR of hard drive while executing of infected file.
Depending on the system date it formats the disk sectors, and displays the message:
Disk Death
The virus contains the internal text strings:
Bad Junky
I want a job
Justice
Description Justice
It is a very dangerous memory resident parasitic virus. It hooks INT 13h, 21h and writes itself to the end of accessed COM files. The COMMAND.COM file is infected according to the "Lehigh" algorithm, and its length does not grow. Periodically the virus redirects to the wrong address information that is writing, as a result that information might be lost. This infector contains the text:
AND JUSTICE FOR ALL
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