W32.HLLW.Yoof

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Discovered: August 22, 2002
Updated: February 13, 2007 11:40:05 AM
Also Known As: W32/Duload.worm [McAfee], W32/Duload-A [Sophos], WORM_DULOAD.A [Trend]
Type: Worm
Systems Affected: Windows


W32.HLLW.Yoof is a worm that spreads by using the KaZaA file-sharing program. It tricks KaZaA users into downloading and executing the worm.

When W32.HLLW.Yoof runs, the worm copies itself as %system%\SystemConfig.exe and creates the %system%\Media shared folder. It then copies itself to this folder using numerous file names, some of which are:

  • Email Bomber.exe
  • FileServer.exe
  • Kazaa Clone.exe
  • Napster Clone.exe
  • Winmx.exe
  • Website Hacker.exe
  • Hotmail Hacker.exe
  • Windows Hacker.exe


Antivirus Protection Dates

  • Initial Rapid Release version August 22, 2002
  • Latest Rapid Release version June 08, 2018 revision 024
  • Initial Daily Certified version August 22, 2002
  • Latest Daily Certified version June 09, 2018 revision 001
  • Initial Weekly Certified release date August 22, 2002

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

Writeup By: Douglas Knowles

Discovered: August 22, 2002
Updated: February 13, 2007 11:40:05 AM
Also Known As: W32/Duload.worm [McAfee], W32/Duload-A [Sophos], WORM_DULOAD.A [Trend]
Type: Worm
Systems Affected: Windows


When it is run, W32.HLLW.Yoof does the following:

It copies itself as %system%\SystemConfig.exe.

NOTE: %system% is a variable. The worm locates the System folder and copies itself to that location. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

The worm adds the value

Windows System Configure    %System%\SystemConfig.exe

to these registry keys:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\RunServices

so that it runs each time that you start Windows.

Some variants also download a file named C:\Uninstall.exe. If the worm downloads and executes this file, it then downloads a file named C:\Unwise.exe and sends an ICQ page to the virus creator.

The worm then creates the%system%\Media folder. It then configures this folder to be a shared KaZaA folder by making the following registry modifications:

  • It adds the values

    Dir0 %system%\Media
    Dir1 %system%\Media
    Dir2 012345:%System%\Media
    Disable Sharing 0

    to the registry key

    HKEY_CURRENT_USER\Software\Kazaa\LocalContent
  • It adds the values

    DlDir0 012345:%system%\Media
    DlDir1 %system%\Media
    DlDir99 012345:%system%\Media

    to the registry key

    HKEY_CURRENT_USER\Software\Kazaa\Transfer
  • It adds the value

    Sharedir %System%\Media

    to the registry key:

    HKEY_LOCAL_MACHINE\Software\Kazaa\Cloudload

Finally, it copies itself to %system%\Media as the following files:
  • Jenna Jamison Dildo Humping.exe
  • Pamela Anderson And Tommy Lee Home Video.exe
  • Alicia Silverstone Payboy Nude.exe
  • Kama Sutra Tetris.exe
  • Flash Golf.exe
  • Hoes For You Solitare.exe
  • Bingo.exe
  • Irc Client.exe
  • Mirc 7.0.exe
  • Email Bomber.exe
  • FileServer.exe
  • Kazaa Clone.exe
  • Napster Clone.exe
  • Winmx.exe
  • Website Hacker.exe
  • Hotmail Hacker.exe
  • Windows Hacker.exe
  • Free Porn.exe
  • Free Mpegs.exe
  • Free Pics.exe
  • Xbox Emulator.exe
  • Britney Spears Dance Beat.exe
  • Shakira Dancing.exe
  • J.Lo Bikini Screensaver.exe
  • Universal Game Crack.exe
  • Soldier Of Fortune 2 Mutiplayer Serial Hack.exe
  • Play Games Online For FREE.exe
  • Win A Ps2.exe
  • Win An Xbox.exe
  • Ps2 Emulator.exe
  • Ps2 Iso 2 Rom Converter.exe
  • Xbox Iso 2 Rom Converter.exe
  • The Sims Game Crack.exe
  • Working Iso Burner.exe
  • Winzip.exe
  • Winrar.exe
  • Winace.exe
  • System Monitor.exe
  • Warcraft 3 Battle.net Crack.exe
  • DDos Client.exe


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.

Writeup By: Douglas Knowles

Discovered: August 22, 2002
Updated: February 13, 2007 11:40:05 AM
Also Known As: W32/Duload.worm [McAfee], W32/Duload-A [Sophos], WORM_DULOAD.A [Trend]
Type: Worm
Systems Affected: Windows


NOTE: 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, run a full system scan, and delete all files that are detected as W32.HLLW.Yoof.
  2. Delete the values that the worm added to the registry.
For details on how to do this, read the following instructions.

To scan for and delete the infected files:
  1. Obtain the most recent virus definitions. There are two ways to do this:
    • Run LiveUpdate, which is the easiest way to obtain virus definitions. These virus definitions have undergone full quality assurance testing by Symantec Security Response and are posted to the LiveUpdate servers one time each week (usually Wednesdays) unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, look at the Virus Definitions (LiveUpdate) line at the top of this write-up.
    • Download the definitions using the Intelligent Updater. Intelligent Updater virus definitions have undergone full quality assurance testing by Symantec Security Response. They are posted on U.S. business days (Monday through Friday). They must be downloaded from the Symantec Security Response Web site and installed manually. To determine whether definitions for this threat are available by the Intelligent Updater, look at the Virus Definitions (Intelligent Updater) line at the top of this write-up.

      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.
  2. Start your Symantec antivirus program, and make sure that it is configured to scan all files.
  3. Run a full system scan.
  4. If any files are detected as infected by W32.HLLW.Yoof, click Delete.

To delete the values that the worm added to the registry:

CAUTION : Symantec strongly recommends that you back up the registry before you make any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify only the keys that are specified. Read the document How to make a backup of the Windows registry for instructions.
  1. Click Start, and click Run. The Run dialog box appears.
  2. Type regedit and then click OK. The Registry Editor opens.
  3. Navigate to each of these keys:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
    CurrentVersion\RunServices

    and in the right pane, delete the value

    Windows System Configure    %system%\SystemConfig.exe
  4. Navigate to the key

    HKEY_CURRENT_USER\Software\Kazaa\LocalContent
  5. In the right pane, delete these values:

    Dir0 %system%\Media
    Dir1 %system%\Media
    Dir2 012345:%System%\Media
    Disable Sharing 0
  6. Navigate to the key

    HKEY_CURRENT_USER\Software\Kazaa\Transfer
  7. In the right pane, delete these values

    DlDir0 012345:%system%\Media
    DlDir1 %system%\Media
    DlDir99 012345:%system%\Media
  8. Navigate to the key

    HKEY_LOCAL_MACHINE\Software\Kazaa\Cloudload
  9. In the right pane, delete the value

    Sharedir %System%\Media
  10. Exit the Registry Editor.


Writeup By: Douglas Knowles