W32.HLLW.Elitor

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Discovered: August 28, 2002
Updated: February 13, 2007 11:58:20 AM
Also Known As: WORM_ELITOR.A [Trend], Trojan.Win32.Elitor [AVP]
Type: Worm
Systems Affected: Windows



W32.HLLW.Elitor is a worm that spreads using MSN Messenger. It is very similar in functionality to Backdoor.Kryost , the major difference being that it will attempt to send this file:

C:\Windows\System\Britney spears naked.jpg .exe

to other MSN Messenger contacts.

W32.HLLW.Elitor allows unauthorized access to an infected computer using MSN Messenger.

Antivirus Protection Dates

  • Initial Rapid Release version August 29, 2002
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version August 29, 2002
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date September 04, 2002

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

Writeup By: Douglas Knowles

Discovered: August 28, 2002
Updated: February 13, 2007 11:58:20 AM
Also Known As: WORM_ELITOR.A [Trend], Trojan.Win32.Elitor [AVP]
Type: Worm
Systems Affected: Windows


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

The worm copies itself to this file, which includes numerous spaces between .jpg and .exe:

C:\Windows\System\Britney spears naked.jpg .exe

It then sends the following text in an Instant Message to try to trick other MSN Messenger users into executing the viral file:

Look at this picture its well nice

That message is followed by more text. Then it will send the file

C:\Windows\System\Britney spears naked.jpg .exe

If the MSN Messenger user accepts the file transfer request, the worm sends them another Instant Message.

It also sends an email message to the virus author to indicate that the infected computer has been compromised.

the worm allows unauthorized access through the use of MSN Messenger commands. It attempts to capture MSN Messenger commands that perform the remote execution of files. It may also sends vulgar messages to contacts using MSN Messenger.

So that it runs each time that you start Windows, it adds the value

MSDOOD C:\Windows\System\Britney spears naked.jpg <spaces>. exe

to the registry key

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

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 28, 2002
Updated: February 13, 2007 11:58:20 AM
Also Known As: WORM_ELITOR.A [Trend], Trojan.Win32.Elitor [AVP]
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.Elitor.
  2. Delete the value

    MSDOOD C:\Windows\System\Britney spears naked.jpg <spaces>. exe

    from the registry key

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
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 ensure 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.Elitor, click Delete.


To remove the value from 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 the key

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
  4. In the right pane, delete the value:

    MSDOOD C:\Windows\System\Britney spears naked.jpg <spaces>. exe
  5. Exit the Registry Editor.


Writeup By: Douglas Knowles