W32.Spybot.ANJJ

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Discovered: January 05, 2007
Updated: February 13, 2007 1:03:10 PM
Type: Worm
Systems Affected: Windows



W32.Spybot.ANJJ is a worm that spreads through mIRC and to network shares protected by weak passwords. It also spreads by exploiting system vulnerabilities.

Notes:

  • Recent variants of the Spybot worm family exploit several known vulnerabilities, including a SAV 10/SCS 3 vulnerability (SYM06-010), reported in May 2006. A patch for this vulnerability was made available at that time. Symantec highly recommends that users of the affected products patch their systems as soon as they are able to help avoid the spread of this particular Sybot worm family. If systems are infected with any Spybot variant and this security patch has not been applied please read the document, Attempting to migrate from 10.x to a newer version fails after becoming infected with a worm which exploits SYM06-010.
  • Excessive network traffic caused by an infection may result in a significant degradation of network performance.
  • IPS signatures against all known and unknown exploits of SYM06-010 were released on May 26, 2006.


Antivirus Protection Dates

  • Initial Rapid Release version January 06, 2007
  • Latest Rapid Release version August 20, 2008 revision 017
  • Initial Daily Certified version January 06, 2007
  • Latest Daily Certified version August 20, 2008 revision 016
  • Initial Weekly Certified release date January 10, 2007

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

Writeup By: Robert X Wang

Discovered: January 05, 2007
Updated: February 13, 2007 1:03:10 PM
Type: Worm
Systems Affected: Windows


When W32.Spybot.ANJJ is executed, it performs the following actions:

  1. Copies itself as the following file:

    %Windir%\mshelpdsk.exe

    Note: %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

  2. Creates the following files:

    • c:\symantc.exe
    • %Windir%\SMonitor.sys

  3. Adds the value:

    "Microsoft Helpdesk Side"="mshelpdsk.exe"

    to the registry subkeys:

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

    so that it runs every time Windows starts.

  4. Inserts a temporary rootkit component c:\symantc.exe, executes it to hide the worm's process and then deletes the rootkit component.

  5. Uses the %Windir%\SMonitor.sys file to create a temporary driver which then creates a service with the following properties:

    Service Name: SMonitor
    Display Name: SMonitor
    Type: Automatic

  6. Opens a back door and connects to following IRC server on TCP port 2211:

    livepm.hanashteam.com/[REMOVED]

  7. May perform the following actions on the compromised computer:

    • Copy or delete files
    • Upload and download files
    • Steal CD keys from various games
    • Log keystrokes and capture webcam
    • Show status
    • Show IP address
    • Portscan the network for vulnerable computers
    • Scan vulnerabilities
    • Start ftp and tftp
    • Start Internet Explorer
    • End processes
    • Stop other worms
    • Stop security-related services
    • List processes
    • Use a network sniffer

  8. Spreads by exploiting the following vulnerabilities:

  9. The worm attempts to spread through mIRC and to network shares protected by weak passwords.

This worm attempts to exploit a previously addressed vulnerability in Symantec Client Security and Symantec Antivirus, SYM06-010; patches for the particular Symantec product vulnerability have been available since Thursday, May 25th, 2006. As a result, customers who have applied the patch in their environment are unaffected by the worm's attempt to leverage the Symantec vulnerability for an attack. Customers running Symantec Client Security or Symantec intrusion prevention (IPS) capable products are protected against all known and unknown exploits of SYM06-010 via IPS signatures released on May 26th, 2006.


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: Robert X Wang

Discovered: January 05, 2007
Updated: February 13, 2007 1:03:10 PM
Type: Worm
Systems Affected: Windows


The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

  1. Disable System Restore (Windows Me/XP).
  2. Update the virus definitions.
  3. Run a full system scan.
  4. Delete any values added to the registry.
For specific details on each of these steps, read the following instructions.

1. To disable System Restore (Windows Me/XP)
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:
Note:
When you are completely finished with the removal procedure and are satisfied that the threat has been removed, reenable System Restore by following the instructions in the aforementioned documents.

For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article: Antivirus Tools Cannot Clean Infected Files in the _Restore Folder (Article ID: Q263455).

2. To update 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 virus definitions:
    • If you use Norton AntiVirus 2006, Symantec AntiVirus Corporate Edition 10.0, or newer products, LiveUpdate definitions are updated daily. These products include newer technology.
    • If you use Norton AntiVirus 2005, Symantec AntiVirus Corporate Edition 9.0, or earlier products, LiveUpdate definitions are updated weekly. The exception is major outbreaks, when definitions are updated more often.
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted daily. 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 Virus Definitions (Intelligent Updater).

    The latest Intelligent Updater virus definitions can be obtained here: Intelligent Updater virus definitions. For detailed instructions read the document: How to update virus definition files using the Intelligent Updater.

3. To run a full system scan
  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, follow the instructions displayed by your antivirus program.

Important: If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do this, run the scan in Safe mode. For instructions, read the document, How to start the computer in Safe Mode . Once you have restarted in Safe mode, run the scan again.

After the files are deleted, restart the computer in Normal mode and proceed with the next section.

Warning messages may be displayed when the computer is restarted, since the threat may not be fully removed at this point. You can ignore these messages and click OK. These messages will not appear when the computer is restarted after the removal instructions have been fully completed. The messages displayed may be similar to the following:

Title: [FILE PATH]
Message body: Windows cannot find [FILE NAME]. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.


4. To delete the value from the registry
Important: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified subkeys only. For instructions refer to the document: How to make a backup of the Windows registry.
  1. Click Start > Run.
  2. Type regedit
  3. Click OK.

    Note: If the registry editor fails to open the threat may have modified the registry to prevent access to the registry editor. Security Response has developed a tool to resolve this problem. Download and run this tool, and then continue with the removal.

  4. Navigate to the subkeys:

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

  5. In the right pane, delete the value:

    "Microsoft Helpdesk Side"="mshelpdsk.exe"

  6. Exit the Registry Editor.


Writeup By: Robert X Wang