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:
http://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
[FSAV_Database_Version]
Version=2005-08-16_1
Technical Details:
Jarkko Turkulainen & Ero Carrera; Aug 16th, 2005;
Updated:
Jarkko Turkulainen; Aug 17th, 2005;
Updated:
Jarkko Turkulainen; Aug 18th, 2005;
F-Secure Corporation
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