Discovered: December 20, 2002
Updated: February 13, 2007 11:50:42 AM
Also Known As: Downloader-BN.b [McAfee]
Type: Trojan Horse
Systems Affected: Windows
Backdoor.Lala is a Trojan Horse that allows unauthorized access to a compromised computer. The Trojan opens TCP/UDP port 4627, 1149, or 1877 to allow remote access. The Trojan attempts to steal confidential information (such as cached passwords and cookies), log keystrokes, and allow for remote file execution.
Backdoor.Lala is written in the Borland Delphi programming language and is compressed with tElock.
Note: The W32.Sobig.A@mm worm can download Backdoor.Lala.
Antivirus Protection Dates
- Initial Rapid Release version December 23, 2002
- Latest Rapid Release version May 07, 2019 revision 006
- Initial Daily Certified version December 23, 2002
- Latest Daily Certified version May 07, 2019 revision 008
- Initial Weekly Certified release date December 24, 2002
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
When Backdoor.Lala runs, it does the following:
- Copies itself as one of the following:
NOTE: %System% is a variable. The Trojan locates the system folder and copies itself to that location. The default location is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
- Creates one of these values:
in the registry keys:
so that the Trojan starts each time you start Windows.
- The Trojan creates one of the following files.
- %System%\Ndrbk32.dll, which is 11,776 bytes in size. Symantec antivirus products detect this file as PWS.Hooker.Trojan.
- %System%\sysmgmt32.dll, which is 17,920 bytes in size. Symantec antivirus products detect this file as PWS.Hooker.Trojan.
- %System%\hnsys32.dll, which is 11776 bytes in size. Symantec antivirus products detect this file as Keylogger.Trojan.
- Notifies the client side through email. The Trojan also sends notification to its creator's Web page. After Backdoor.Lala is installed, the Trojan opens TCP/UDP port 4627, 1877, or 1149 to connect to the remote client, allowing the Trojan's creator to perform any of the following actions:
- Deliver system and network information to the Trojan's creator, including login names and cached network passwords.
- Steal cookies associated with PayPal, iFriend, E-Bullion, EZCardin, Evocash, eBay, WebMoney, and various banks.
- Log keystrokes.
- Download and execute files.
- Obtains the installation status of several programs by querying the registry. The Trojan sends the information to its creator.
The programs are:
- Soldier of Fortune II
- Return to Castle Wolfenstein
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.
The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
- Update the virus definitions.
- Do one of the following:
- Windows 95/98/Me: Restart the computer in Safe mode.
- Windows NT/2000/XP: Stop the Trojan process.
- Run a full system scan and delete all the files detected as Backdoor.Lala.
- Remove the value that the Trojan made to the registry.
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. Restarting the computer in Safe mode or ending the Trojan process
- Windows 95/98/Me
Restart the computer in Safe mode. All the Windows 32-bit operating systems, except for Windows NT, can be restarted in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."
- Windows NT/2000/XP
To end the Trojan process:
- Press Ctrl+Alt+Delete once.
- Click Task Manager.
- Click the Processes tab.
- Double-click the Image Name column header to alphabetically sort the processes.
- Scroll through the list and look for Win32loader.exe.
- If you find the file, click it, and then click End Process.
- Exit the Task Manager.
- Start your Symantec antivirus program and make sure that it is configured to scan all the files.
- For Norton AntiVirus consumer products: Read the document, "How to configure Norton AntiVirus to scan all files."
- For Symantec AntiVirus Enterprise products: Read the document, "How to verify that a Symantec Corporate antivirus product is set to scan all files."
- Run a full system scan.
- If any files are detected as infected with Backdoor.Lala, PWS.Hooker.Trojan, or Keylogger.Trojan, click Delete.
4. Removing the value added to 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. For instructions, read the document, "How to make a backup of the Windows registry ."
- Click Start, and then click Run. (The Run dialog box appears.)
- Type regedit, and then click OK. (The Registry Editor opens.)
- Navigate to the key:
- In the right pane, delete any value that refers to the files detected as Backdoor.Lala.
- Click Registry, and then click Exit.
Writeup By: Yana Liu