Backdoor.IRC.Aladinz.C

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Discovered: July 02, 2003
Updated: February 13, 2007 12:03:20 PM
Also Known As: Worm.Win32.Ircobus [KAV], Worm.Win32.Randon.p [KAV]
Type: Trojan Horse
Systems Affected: Windows


Backdoor.IRC.Aladinz.C is an IRC Trojan Horse that gives its creator full control over a compromised system. The Trojan may be downloaded by the Trojan.Downloader.Aphe from the Web site, www.ircx-vanguard.com. The existence of the file uqir.exe is an indication of a possible infection.

Antivirus Protection Dates

  • Initial Rapid Release version July 03, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version July 03, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date July 09, 2003

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

Writeup By: Yana Liu

Discovered: July 02, 2003
Updated: February 13, 2007 12:03:20 PM
Also Known As: Worm.Win32.Ircobus [KAV], Worm.Win32.Randon.p [KAV]
Type: Trojan Horse
Systems Affected: Windows



Backdoor.IRC.Aladinz.C may be downloaded by the Trojan.Downloader.Aphe from the Web site, www.ircx-vanguard.com, as C:\uqir.exe. Then, C:\uqir.exe is executed.

When C:\uqir.exe runs, it does the following:

  1. Creates a subfolder, %System%\Kitro.

    NOTE: %System% is a variable. The Trojan locates the System folder and creates a subfolder under 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).

  2. Creates the following files in the folder %System%\Kitro:
    • Libparse.exe (25,600 bytes), which is a process viewer. This utility is not viral by itself.
    • Psexec.exe (122,880 bytes), which is a remote execution utility. It is not viral by itself.
    • Winsrv_.exe (18,432 bytes), which is a utility used to hide windows. It is not viral by itself.
    • Srv32.dll (22 bytes), which is an IRC script.
    • R.ini (67 bytes), which is an IRC script.
    • Rcfg.ini (2,321 bytes), which is a .ini file that the Trojan uses to load other IRC scripts.
    • Webstat.bat (17,421 bytes), which is a text file that contains many nicknames.
    • Systroy.exe, which is a patched mIRC client program. It is detected as IRC Trojan.
    • Keu.exe (2,560 bytes), which is a Trojan.Downloader.Aphe Trojan.
    • Systems32x.dll (33,036 bytes), which is an IRC script. It is detected as Backdoor.IRC.Aladinz.C.
    • Secure.BAT (546 bytes), which is a Trojan batch file. It is detected as Backdoor.IRC.Aladinz.C.
    • Sys_bat.bat (3,818 bytes), which is a Trojan batch file. Backdoor.IRC.Aladinz.C uses this batch file to connect to remote IPC$ shares on each of the IP addresses it finds, using various username and password pairs.
      If sys_bat.bat is successful, it copies Keu.exe to the remote system and runs this downloader.

  3. Adds a value:

    "win32ini"="%System%\Kitro\systroy.exe"

    to the registry key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

    so that this patched mIRC program runs when you restart Windows, causing the script components of Backdoor.Aladinz.C to run as well.

  4. Hooks the IRC file extensions in HKEY_LOCAL_MACHIN\Software\Classes that call %System%\Kitro\Systroy.exe when chat files are opened.

  5. Creates the subkey, OBCD, in the registry key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall

    and adds the following values to this subkey:

    "DisplayName"="mIRC"
    "UninstallString"=""%System%\Kitro\systroy.exe" -uninstall"

  6. Runs %System%\Kitro\Systroy.exe in the background.

  7. Uses the dropped system32x.dll file to connect to some randomly generated IP addresses. Then, the Trojan uses the dropped batch files to connect to the remote IPC$ and ADMIN$ shares on each of the IP addresses that it finds. In doing this, it uses various username and password pairs, and then attempts to copy and run the Keu.exe file on the remote systems.


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: Yana Liu

Discovered: July 02, 2003
Updated: February 13, 2007 12:03:20 PM
Also Known As: Worm.Win32.Ircobus [KAV], Worm.Win32.Randon.p [KAV]
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. Update the virus definitions.
  2. Run a full system scan and delete all the files detected as viral. Delete all the files in the %System%\Kitro folder.
  3. Delete the values that were added to the registry.
For specific details on each of these steps, read the following instructions.

1. 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.

2. 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. Delete any files that are detected as any of the following:
    • Backdoor.IRC.Aladinz.C
    • Trojan.Downloader.Aphe
    • IRC Trojan
  4. Using Windows Explorer, delete all the files in the %System%\Kitro folder.

3. Deleting the value from the registry

CAUTION : 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:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete the value:

    "win32ini"="%System%\Kitro\systroy.exe"

  5. Navigate to the key and delete it:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
    Uninstall\OBCD

  6. Exit the Registry Editor.


Writeup By: Yana Liu