Virus Database

Loz Family

Description Loz Family

These are dangerous memory resident encrypted parasitic viruses. Some of them use the polymorphic technology. They hook INT 21h and write themselves to the end of COM and EXE files that are accessed (the earlier versions infect COM files only). These viruses alter the first 4 bytes of COM files (JMP Loc_Virus, DB '+'). While creating a resident copy they decrease the value of system memory (the word at 0000:0413).
"Loz.1018,1023" viruses modify system information in boot sectors of floppies (set to zero the word corresponding to the number of disk drive heads). When the AIDSTEST.EXE (soviet antiviral program) is run the viruses display: "Welcom to demo version (C) Zherkov", (thereafter in Russian) "Lozinsky - STUPID, AIDSTEST-RUBBISH" (D.Lozinsky - author of a popular Russian anti-virus program). The "Loz.1018" virus deletes the AIDSTEST.EXE program. The "Loz.1882,1915" viruses delete the AIDSTEST.EXE file as it is run and display the following message (in Russian):
+-----------------------+
¦"INVARIATRON" JV ¦
¦Antiscientific centre ¦
¦Version 5 of 11.12.90 ¦
¦Lozinsky - STUPID ¦
¦Moscow, tel. 03 ¦
+-----------------------+
The full explanation see in the next AIDSREAD.ME.

"Loz.2968" sometimes displays the following picture:
________ ___ ___ ___ ___
¦¦¦ ¦¦¦ ¦¦¦ ____ ¦¦¦ _________¦¦¦___________________¦¦¦__
¦¦¦ ¦¦¦ ___ _____¦¦¦ ________ ¦¦¦ ________ ________ ¦¦¦
¦¦¦__¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¯¯¯ ¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¯¯¯ ¦¦¦
¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¯¯¯¯¯¦¦¦ ¦¦¦ ¦¦¦__¦¦¦ ¯¯¯¯¯¦¦¦ ¦¦¦
¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ___ ¦¦¦ ¦¦¦ ¦¦¦
¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦__¦¦¦ ¦¦¦__¦¦¦ ¦¦¦ ¦¦¦__¦¦¦ ¦¦¦__¦¦¦ ¦¦¦
¦¦¦¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¦¦¯¯¯¯¯¯¯¯¯
¦¦¦ ¦¦¦¯¦¦¦ ¦¦¦¯¦¦¦ ¦¦¦¯¯¯¯ ¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¦¦ ¦¦¦¯¦¦¦
¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦¯¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¦ ¦¦¦ ¦¦¦¯¦¦¦ ¦¦¦_¦¦¦
¦¦¦ ¦¦¦_¦¦¦ ¦¦¦_¦¦¦ ¦¦¦_¦¦¦ ¦¦¦_¦¦¦ ¦¦¦_¦_¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦ ¦¦¦
___________ ¦¦¦ ________________¦¦¦ _________________________

"Loz.2435" detects the virtual mode which is used by debuggers on 80x86 computers and disables debugging.
Loz.724
It is a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM files (except COMMAND.COM) that are executed. The virus creates a counter in the MBR of the hard drive and increases it on installing into the system memory. On 100th installing the virus hooks INT 9, then it depending on pressed keys writes some data to a hard drive port. The virus contains the text string:
by ShADow Al

Check other viruses! Be aware! Use Antiviral Software

Chance.a

Description Chance.a

This is a benign memory resident stealth boot virus that hooks INT 13h, and writes into floppy disk boot sectors and the C: drive. On 8 December, it decrypts and displays the message:
"All we are saying is give peace a chance" (J. Lennon)

It also contains the internal encrypted text string:
The John Lennon virus wishes love and peace to everyone
who's got the chance to read this! All my loving to INO!!

Chang.1759

Description Chang.1759

Chang.1759 is a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM- and EXE-files that are executed. If the file's hard drive is write protected, the virus overwrites the MBR by the string:
TOO MANY WRITE PROTECT!!!

It also contains the internal text strings:
12345678
YOU CAN CHANG SOMETHING OF THE PROGRAM.
I HAVE GIVEN UP MY COPYWRITE, AND I HAVELEFT SOME SPACE FOR YOU.
THANKS!

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