Virus Database

Win16.CyberTech

Description Win16.CyberTech

It is a very dangerous memory resident parasitic virus. When an infected program is executed, the virus infects the Windows KERNEL file. When an infected KERNEL is executed, the virus hooks the WinExec function and writes itself to the end of NewEXE files that are executed.
To infect the KERNEL the virus gets the access to that file by using documented function GetModuleHandle, then the virus writes its code to the KERNEL file (KRNL286.EXE or KRNL386.EXE), and patches the system data in that file so, that the address of WinExec routine in the infected KERNEL points to the virus code. Then the virus returns the control to the host NewEXE file. So, when the infected file is executed, the virus infects only the KERNEL file.
When the system with infected KERNEL is loading, the virus stays memory resident as a part of KERNEL code, and patched WinExec address points to the virus handler. When an NewEXE file is executed, the virus infects it.
The virus separates the infected and not infected files by using the ID-label "LROY" that the virus writes to the checksum field in NewEXE header while infecting a file.
Depending on the system date and the day number the virus displays the message box bearing the title:
Chicago 7: Cyber riot

and the messages inside. The virus displays different messages, in April starting from 29th and on May 1st:
Happy anniversary, Los Angeles!
Anarchists of the world, unite!

On any Friday before the 13th of a month:
When the levee breaks, I have no place to stayall
(Crying won't help you. Praying won't do you no good.)

On March 6 and in December from 1st to 26th:
Save the Whale, harpoon a fat cat.

After displaying the message, the virus erases disk sectors.
The virus also contains the text strings:
USER KERNEL Chicago-7 CyberRiot, 15.1.1993 Klash (Werner L.)
Sommer 1993: 15 Windowscomputerviren
Coming soon: Diet riot. Same great aftertaste--fewer bytes.
Source code avaiable for $15,000,000. Serious inquiries only.
Why does IBM need to lay me off? Oh well, their loss.
McAfee's FUD equation: !!!!!!+??????=$$$$$$
Convict the pigs
This program was written in the cities of Hamburg, Chicago, Seattle and
Berkeley. Copyright (C) 1993 Klash/Skism/George J/Phalcon/Henry Buscombe
and 2 ex-Softies, collectively known as the Chicago 7.

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Ryazan.512

Description Ryazan.512

This is a harmless memory resident encrypted parasitic virus. It copies itself to the Interrupt Vectors Table at the address 0000:0200, hooks INT 21h and then writes itself to the end of the EXE files that are executed or opened. It contains the text:
Ryazan

Rycho Family

Description Rycho Family

These are not dangerous parasitic viruses. They search for EXE files and writes themselves to the end of the file.
"Rycho.1024.a" and "Rycho.1536.a" are nonmemory resident viruses. "Rycho.1024.b" and "Rycho.1536.b" are memory resident ones, they hook INT 1Ch, 21h and search for .EXE files when any program is executed.
"Rycho.1024.b" changes the video fonts so that the characters stays invisible. "Rycho.1536.a,b" display the messages:
"Rycho.1536.a": A.N.F. WalczyallPunx not dead...!!! #VIR v1.41
"Rycho.1536.b":
+----> UWAGA - wirus `ASIULA` <---+
¦ Marry Christmas and Happy New ¦
¦ Year. Ha,Ha my friends. RYCHO G.¦
+---------------------------------+
Rycho.Babol.2048
It is a harmless memory resident parasitic virus. It hooks INT 13h, 21h.
While selecting new disk the virus searches for EXE files, and writes
itself to the end of the file. The virus contains several routines that are
never called. The virus contains the text strings:
(C) Dj.Babol
*Made in Poland *Greetings to M.Sell
*Beda z ciebie ludzie ..sie smiali!*.COM Äis safe!
You are death*Pozdrowienia dla w.wirusowcow!
*.EXE

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