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Discovered: February 19, 2004
Updated: February 13, 2007 12:17:45 PM
Type: Trojan Horse
Systems Affected: Windows

Backdoor.IRC.Aladinz.K is a backdoor Trojan horse that uses malicious scripts in the mIRC client software, allowing unauthorized remote access.

Antivirus Protection Dates

  • Initial Rapid Release version February 19, 2004
  • Latest Rapid Release version August 08, 2016 revision 023
  • Initial Daily Certified version February 19, 2004
  • Latest Daily Certified version August 09, 2016 revision 001
  • Initial Weekly Certified release date February 25, 2004

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

Writeup By: Fergal Ladley

Discovered: February 19, 2004
Updated: February 13, 2007 12:17:45 PM
Type: Trojan Horse
Systems Affected: Windows

When Backdoor.IRC.Aladinz.K is executed, it performs the following actions:

  1. Creates the following files:
    • C:\upd.exe (detected as Backdoor.IRC.Aladinz.K)
    • C:\inst.bat
    • C:\pv.exe
    • C:\restore.exe (detected as Hacktool.HideWindow)

  2. Runs the file, C:\upd.exe, which creates the following folders:
    • %Windir%\System32\plugins
    • %Windir%\System32\plugins\dat
    • %Windir%\System32\plugins\downloads
    • %Windir%\System32\plugins\log
    • %Windir%\System32\plugins\logs
    • %Windir%\System32\plugins\plugins
    • %Windir%\System32\plugins\sounds

      and the following files:

    • %Windir%\System32\plugins\dat\config.ini
    • %Windir%\System32\plugins\dat\easy_user.dic
    • %Windir%\System32\plugins\dat\language.ini
    • %Windir%\System32\plugins\dat\nt_pass.dic
    • %Windir%\System32\plugins\dat\nt_user.dic
    • %Windir%\System32\plugins\dat\os.finger
    • %Windir%\System32\plugins\dat\port.ini
    • %Windir%\System32\plugins\dat\rpc.ini
    • %Windir%\System32\plugins\plugin\010-port.xpn (detected as Hacktool.Xscan)
    • %Windir%\System32\plugins\plugin\020-netbios.xpn (detected as Hacktool.Xscan)
    • %Windir%\System32\plugins\plugin\030-rpc.xpn (detected as Hacktool.Xscan)
    • %Windir%\System32\plugins\plugin\090-ntpass.xpn (detected as Hacktool.Xscan)
    • %Windir%\System32\plugins\addreg.bat
    • %Windir%\System32\plugins\addreg.reg (detected as Backdoor.Trojan)
    • %Windir%\System32\plugins\addregnt.reg
    • %Windir%\System32\plugins\addregxp.reg
    • %Windir%\System32\plugins\avupd.exe
    • %Windir%\System32\plugins\background.jpg
    • %Windir%\System32\plugins\dd9a.wav
    • %Windir%\System32\plugins\delroot.bat
    • %Windir%\System32\plugins\delscans.bat
    • %Windir%\System32\plugins\get.exe
    • %Windir%\System32\plugins\icon.jpg
    • %Windir%\System32\plugins\init.bat (detected as Backdoor.IRC.Aladinz.K)
    • %Windir%\System32\plugins\onrpc.dll
    • %Windir%\System32\plugins\parse.txt
    • %Windir%\System32\plugins\preset.ini (detected as Backdoor.IRC.Aladinz.K)
    • %Windir%\System32\plugins\psexec.exe
    • %Windir%\System32\plugins\random.txt
    • %Windir%\System32\plugins\Rar.exe
    • %Windir%\System32\plugins\remote.ini
    • %Windir%\System32\plugins\remove.exe
    • %Windir%\System32\plugins\restart.bat
    • %Windir%\System32\plugins\restore.exe (detected as Hacktool.HideWindow)
    • %Windir%\System32\plugins\spool.exe
    • %Windir%\System32\plugins\svhost.exe (detected as Hacktool.Xscan)
    • %Windir%\System32\plugins\test.ini (detected as Backdoor.IRC.Aladinz.K)
    • %Windir%\System32\plugins\upd.bat (detected as Backdoor.IRC.Aladinz.K)
    • %Windir%\System32\plugins\X-ScanCfg.ini

  3. Deletes all the values in the registry key:


    which prevents programs that use this key from starting when Windows starts.

  4. Adds the value:

    "PrinterSpool"="%System%\PLUGINS\RESTORE.EXE %System%\PLUGINS\

    to the registry key:


    so that the Trojan runs when you start Windows.

  5. Sets the values to zero as shown here:


    in the registry key:


    so that the administrative shares of the computer are disabled.

  6. Adds the subkey:


    and sets the value to:


  7. Adds the subkey:


    and sets the value:


  8. Adds the subkey:


    and sets the value to:


  9. Attempts to overwrite the following configuration files:
    • C:\Program Files\nav\CfgWiz.dat
    • C:\Program Files\nav\exclude.dat
    • C:\Program Files\nav\navopts.dat
    • C:\Program Files\nav\savrt.dat
    • C:\Program Files\nav\srtsexcl.dat
    • C:\Program Files\Norton AntiVirus\CfgWiz.dat
    • C:\Program Files\Norton AntiVirus\exclude.dat
    • C:\Program Files\Norton AntiVirus\navopts.dat
    • C:\Program Files\Norton AntiVirus\savrt.dat
    • C:\Program Files\Norton AntiVirus\srtsexcl.dat
    • C:\Program Files\Norton SystemWorks\Norton AntiVirus\CfgWiz.dat
    • C:\Program Files\Norton SystemWorks\Norton AntiVirus\exclude.dat
    • C:\Program Files\Norton SystemWorks\Norton AntiVirus\navopts.dat
    • C:\Program Files\Norton SystemWorks\Norton AntiVirus\savrt.dat
    • C:\Program Files\Norton SystemWorks\Norton AntiVirus\srtsexcl.dat

      which may modify certain settings in Norton AntiVirus. In particular, it may cause the following folders to be excluded from virus scanning:

    • C:\Windows\System32
    • C:\Winnt\System32
    • D:\Windows\System32
    • D:\Winnt\System32

  10. Allows a remote attacker to control the computer. The functions provided include:
    • Retrieving information about the computer.
    • Stopping and restarting the Trojan.
    • Downloading and running files.
    • Scanning hosts for vulnerabilities using the X-Scan network vulnerability scanner.


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: Fergal Ladley

Discovered: February 19, 2004
Updated: February 13, 2007 12:17:45 PM
Type: Trojan Horse
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. Delete the values that were added to the registry.
  4. Uninstall and re-install Norton AntiVirus.
  5. Run a full system scan and delete all the files detected as Backdoor.IRC.Aladinz.K.
For specific details on each of these steps, read the following instructions.

1. Disabling 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, re-enable 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. 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 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).
  • 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).

    The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater" for detailed instructions.

3. Deleting the values from the registry

WARNING: 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 keys only. Read the document, "How to make a backup of the Windows registry ," for instructions.
  1. Click Start, and then click Run. (The Run dialog box appears.)
  2. Type regedit

    Then click OK. (The Registry Editor opens.)

  3. Navigate to the key:


  4. In the right pane, delete the value:

    "PrinterSpool"="%System%\PLUGINS\RESTORE.EXE %System%\PLUGINS\SPOOL.EXE"

  5. Navigate to the key:


    Note: If you do not use mIRC, you can delete this key and go to step i. If you use mIRC, complete steps f through h.

  6. Navigate to the key:


    and reset the value:


    to the correct value.

  7. Navigate to the key:


    and reset the value:


    to the correct value.

  8. Navigate to the key:


    and reset the value:


    to the correct value.

  9. Exit the Registry Editor.

4. Uninstalling and re-installing Norton AntiVirus
Since Backoor.IRC.Aladinz.K attempts to modify certain Norton AntiVirus files, you will need to uninstall and re-install Norton AntiVirus to completely remove this Trojan. For instructions, read the following document relevant to your version of Norton AntiVirus:
5. 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 Backdoor.IRC.Aladinz.K, Backdoor.Trojan, Hacktool.HideWindow, or Hacktool.X-Scan, click Delete.

    Symantec Security Response also recommends that you also delete all the other files that Backdoor.IRC.Aladinz.K dropped, as described in steps 1 and 2 of the "Technical Details" section.

Writeup By: Fergal Ladley