Threat Description

IRCBot.et

Details

Category: Malware
Platform: W32
Aliases: Backdoor.Win32.IRCBot.et, W32.Zotob.D, W32/Dogbot-A

Summary


A new variant of a bot spreading the Plug and Play service (MS05-039) vulnerability has been found on August, 16th 2005.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more assistance.

Network Disinfection

For general instructions on disinfecting a local network infection, please see Eliminating A Local Network Outbreak.



Technical Details


The worm is a packed PE executable file 51326 bytes long.

Installation to system

When run, the worm copies under %SYSTEM% directory using the name 'windrg32.exe'. Then it adds the following registry entries to ensure that it is started when a user logs on or the system is restarted:

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]  "winDrg32" = "windrg32.exe"  
Spreading using Plug and Play service vulnerability

The worm scans for systems vulnerable to Microsoft Windows Plug and Play service (MS05-039) through TCP/445.

Here's the summary of the ports used in attack:

  • Port 445- The worm scans for systems vulnerable to PnP exploit through this port
  • Port 29463- FTP server port on infected systems
  • Port 6667- The command shell port opened by the exploit code

Please see the following page for detailed information on the vulnerability: https://www.microsoft.com/technet/security/Bulletin/MS05-039.mspx

Bot functionality

The worm tries to connect to IRC channel at predefined address.

The attacker who knows channel password can instruct the bot to execute the following actions:

Disconnect/reconnect from the IRC channel  Request system information  Download and execute files  Remove worm from the system  Manipulate system security settings  
Other details

IRCBot.et tries to uninstall some other malware and adware by deleting files and folders and removing registry keys.

The worm tries to terminates the following processes:

botzor.exe		(Net-Worm.Win32.Mytob.cd / Zotob.A)  
CMESys.ex  csm.exe		(Net-Worm.Win32.Mytob.cf / Zotob.B)  
CxtPls.exe  
NHUpdater.exe  
pnpsrv.exe		(Backdoor.Win32.Rbot.yk)
qttask.exe  
realsched.exe  
ViewMgr.exe  
winpnp.exe		(Backdoor.Win32.Rbot.ym)  

It tries to delete the following registry values:

[HKCU\Software\Microsoft\Windows\Run]  
"180"  "180ax"  "Apropos"  "AutoUpdater"  "CMESys"  "csm Win Updates"  "Ebates"  "EbatesMoeMoneyMaker"  "eZmmod"  "eZula"  "Gator"  "GatorDownloader"  "Hotbar"  "IBIS TB"  "lgbibsn"  "msbb"  "MyWay"  "MyWebSearch"  "NavExcel"  "QuickTime"  "QuickTime Task"  "Real"  "saie"  "sais"  "TBPS"  "TkBellExe"  "Toolbar"  "tov"  "Trickler"  "ViewMgr"  "Viewpoint"  "WeatherOnTray"  "Windows PNP"  "Windows PNP Server"  "WINDOWS SYSTEM"  "WinTools"  "Zotob"  

The worm also tries to delete the following files and folders:

%ProgramFiles%\180Solutions  
%ProgramFiles%\180Solutions\*.exe  
%ProgramFiles%\AutoUpdate  
%ProgramFiles%\AutoUpdate\AutoUpdate.exe  
%ProgramFiles%\Common Files\CMEII  
%ProgramFiles%\Common Files\GMT  
%ProgramFiles%\Common Files\GMT\GMT.exe  
%ProgramFiles%\Common Files\WinTools  
%ProgramFiles%\Common Files\WinTools\*.exe  
%ProgramFiles%\CxtPls  
%ProgramFiles%\EbatesMoeMoneyMaker  
%ProgramFiles%\eZula  
%ProgramFiles%\eZula\mmod.exe  
%ProgramFiles%\Hotbar  
%ProgramFiles%\Hotbar\*.exe  
%ProgramFiles%\MyWay  
%ProgramFiles%\MyWay\*.exe  
%ProgramFiles%\MyWebSearch  
%ProgramFiles%\MyWebSearch\*.exe  
%ProgramFiles%\NavExcel  
%ProgramFiles%\Toolbar  
%ProgramFiles%\Toolbar\*.exe  
%System%\botzor.exe  
%System%\csm.exe  
%System%\pnpsrv.exe  
%System%\winpnp.exe  





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