Caz Family
Description Caz Family
These are dangerous memory resident viruses which hook INT 8, 21h, 2Fh and infect by standard way COM- and EXE-files which are started. If the file CLEAN.* is executed then these viruses decrypt and type the message "Virus anti-McAfee v1.0 (C) SEPTEMBER 1991 Made in SPAIN", then they erase the MBR of the hard drive and reboot the computer. Sometimes "Caz.1024" outputs to EGA/CGA video ports. These viruses contain the internal strings:
EXECOMC:COMMAND.COM CLEAN.
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Jobi
Description Jobi
This is a dangerous memory-resident boot virus. It hooks INT 13h, and writes itself to the boot sector of the C: drive and to boot sectors of floppy disks. It saves the original boot sector to one of the last sectors on the disk. On July 27th, it reboots the computer. It contains the text string:
Ugly Jo's birthday
Jocker.1371
Description Jocker.1371
It is a very dangerous memory resident parasitic virus. It traces and hooks INT 21h, then it writes itself to the end of COM and EXE files that are executed. The virus corrupts .BAS files, it writes the string "JOCKER" to the beginning of these files. The code of this virus to great extent repeats the code of the "Yankee" virus. The virus contains either "COMJOCKER" or "EXEJOCKER" text string depending on the format of infected file (COM or EXE).
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