W32.HLLW.Zule

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Discovered: December 26, 2002
Updated: February 13, 2007 11:41:50 AM
Type: Worm
Systems Affected: Windows


W32.HLLW.Zule is a worm that spreads across the KaZaA file-sharing network by tricking KaZaA users into downloading and opening the program. It also uses IRC to distribute itself. It attempts to delete files and folders belonging to various security software products.

Antivirus Protection Dates

  • Initial Rapid Release version December 26, 2002
  • Latest Rapid Release version December 26, 2002
  • Initial Daily Certified version December 26, 2002
  • Latest Daily Certified version December 26, 2002
  • Initial Weekly Certified release date December 30, 2002

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.


Technical Description


When W32.HLLW.Zule runs, it does following:

It copies itself as one or more of these files:

  • C:\Boot.exe
  • C:\JuZZle.bak
  • C:\Windows\script.~ni
  • C:\Windows\Command\format.com
  • D:\BattlefieldMPpatch.exe
  • E:\XXX.exe
  • F:\X-mas.exe
  • G:\Stoned.exe
  • H:\Scheisse.exe
  • C:\Programme\ficken.exe
  • D:\Lustig.exe
  • E:\Funny.exe
  • F:\SimpsonsGame.exe
  • G:\Hidden.exe
  • H:\Microsoft.exe
  • C:\Windows\Mirakulix.exe
  • A:\Simpsons.exe
  • A:\Bloody.exe
  • C:\Dokumente und Einstellungen\All users\Startmen\Programme\Autostart\bootWin.bat
  • C:\Windows\Startmen\Programme\Autostart\bootWin.bat
  • C:\Windows\Start menu\Programs\startup\bootWin.bat
  • C:\Windows\Erotica.exe

It creates a subfolder named \Certified in the same folder as the one from which the worm was executed. It then copies itself to the \Certified folder as these files:
  • Battlefield Bloodpatch.exe
  • Gta3 Crack NoCD.exe
  • Battlefield MP Update to 1.4 (new!!!).exe
  • Sex in Office (xxx game).exe
  • Warcraft3 More Blood! (Patch).exe
  • How to get doom 3 demo!!!.exe
  • Unreal Tournament 2003 Deutsch BloodPatch!.exe
  • Doom3 Preview!!!.exe
  • Mafia Extreme BloodPatch!.exe
  • How to Crack all gamez.exe
  • Pantera Music Game (brutal).exe
  • Catch Bill Gates! (small game).exe
  • Sarah Connor - Hidden Song (zipped in exe).exe
  • Unreal Tournament 2003 Demo - Trainer!!!.exe
  • juZZle.exe
  • XXX -the hardcore game-.exe
  • Mafia Trainer!!!.exe
  • Warcraft 3 Trainer (for Cheaters).exe
  • Gta3 NoCD +++ most blood.exe
  • Crackz for many games (Gta3,Ut2003,Warcraft3,Mafia,...).exe
  • Der Super Guru downloader!.exe
  • Spiderman fast downloader.exe

It also copies itself as C:\Programme\Kazaa\My shared folder\Erotica XXX Game.exe. Then the worm can spread using the KaZaA file-sharing network.

W32.HLLW.Zule also creates the file C:\Windows\Script.~ni and modifies all ini files in the following folders to spreading itself across IRC channels:
  • C:\Programme\Mirc
  • C:\Mirc
  • D:\Programme\Mirc
  • D:\Mirc
  • E:\Programme\Mirc
  • E:\Mirc
  • F:\Programme\Mirc
  • F:\Mirc
  • G:\Programme\Mirc
  • G:\Mirc

These ini files are detected as IRC.Family.Gen by Symantec antivirus products.

The worm creates the following files. They are not malicious and are not detected as such by Symantec antivirus products. You should delete them manually.
  • C:\Windows\juZZle.txt
  • C:\Jdate.mp3
  • C:\Jinf.mp3
  • C:\<computer name>.mp3

It attempts to delete these files and folders:
  • C:\Programme\Norton\*.exe
  • C:\Programme\Norton\*.dll
  • C:\Programme\Norton\*.dat
  • C:\Programme\Norton\*.vxd
  • C:\Norton\*.exe
  • C:\Norton\*.dll
  • C:\Norton\*.dat
  • C:\Norton\*.vxd
  • C:\Programme\Antivir\*.avc
  • C:\Programme\Antivir\*.set
  • C:\Programme\Antivir\*.dll
  • C:\Programme\Antivir\*.vxd
  • C:\Programme\Antivir\*.exe
  • C:\Antivir\*.Avc
  • C:\Antivir\*.Set
  • C:\Antivir\*.dll
  • C:\Antivir\*.vxd
  • C:\Antivir\*.exe
  • C:\Programme\Mcafee\*.dat
  • C:\Programme\Mcafee\*.dll
  • C:\Programme\Mcafee\*.exe
  • C:\Programme\Mcafee\*.vsc
  • C:\Programme\Mcafee\*.dat
  • C:\Programme\Mcafee\*.dll
  • C:\Programme\Mcafee\*.exe
  • C:\Programme\Mcafee\*.vsc
  • C:\Mcafee\*.dat
  • C:\Mcafee\*.dll
  • C:\Mcafee\*.exe
  • C:\Mcafee\*.vsc
  • C:\Mcafee\*.dat
  • C:\Mcafee\*.dll
  • C:\Mcafee\*.exe
  • C:\Mcafee\*.Vsc
  • C:\Programme\Fsi\F-Prot\*.exe
  • C:\Programme\Fsi\F-Prot\*.dll
  • C:\Programme\Fsi\F-Prot\*.vxd
  • C:\Programme\Fsi\F-Prot\*.rep
  • C:\Programme\F-Prot\*.exe
  • C:\Programme\F-Prot\*.dll
  • C:\Programme\F-Prot\*.vxd
  • C:\Programme\F-Prot\*.rep
  • C:\F-Prot\*.exe
  • C:\F-Prot\*.dll
  • C:\F-Prot\*.vxd
  • C:\F-Prot\*.rep
  • C:\Fsi
  • C:\Windows\Command\Format.com
  • C:\Windows\System\Format.com
  • C:\Windows\System32\Format.com


Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.


Removal


These instructions are for all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

  1. Update the virus definitions.
  2. Run a full system scan, and delete all files that are detected as W32.HLLW.Zule.

For details on how to do this, read the following instructions.

Updating the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Running LiveUpdate, which is the easiest way to obtain the virus definitions. These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to the Virus Definitions (LiveUpdate) line at the top of this writeup.
  • Downloading the definitions using the Intelligent Updater. The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to the Virus Definitions (Intelligent Updater) line at the top of this writeup.

    The Intelligent Updater virus definitions are available here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.

Scanning for and deleting the infected files
  1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
  2. Run a full system scan.
  3. If any files are detected as infected with W32.HLLW.Zule, click Delete.


Writeup By: Kaoru Hayashi