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Discovered: March 23, 2000
Updated: February 13, 2007 11:49:05 AM
Type: Trojan Horse

Backdoor.BladeRunner allows a hacker to remotely control an infected computer.

Possible system changes
If the Trojan has been executed and a hacker has executed files on your computer, it may be difficult to determine exactly what has been done, even after the Trojan has been removed. If you are familiar with your operating system and how to use system repair or system checking tools, we suggest that you fully check the system for any of these modifications and revert them. Otherwise, consider reinstalling the operating system.

Antivirus Protection Dates

  • Initial Rapid Release version January 21, 2002
  • Latest Rapid Release version May 04, 2018 revision 033
  • Initial Daily Certified version January 21, 2002
  • Latest Daily Certified version May 05, 2018 revision 001

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

Writeup By: Andre Post

Discovered: March 23, 2000
Updated: February 13, 2007 11:49:05 AM
Type: Trojan Horse

When it is executed, this Trojan does the following:

It runs a server-side program that opens port 5400 to allow the client on the hacker's computer to communicate with it.

When a Backdoor.BladeRunner client connects to the server, it has full control over the file system on the compromised computer. This allows the hacker to do any of (but not limited to) the following:

  • Download files
  • Upload files
  • Create or delete folders
  • Manage the running processes
  • Execute files
  • Take screenshots
  • Manipulate the cursor
  • Open and close the CD-ROM drive tray
  • Display messages
  • Communicate with the server

To ensure that the server is run on each time that you start Windows, it adds the value

System-Tray     <path to the server file>

to the key



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: Andre Post

Discovered: March 23, 2000
Updated: February 13, 2007 11:49:05 AM
Type: Trojan Horse

To remove this Trojan, delete files that are detected as Backdoor.BladeRunner and remove the value that it added to the registry.

To remove the Trojan:

  1. Run LiveUpdate to make sure that you have the most recent virus definitions.
  2. Start Norton AntiVirus (NAV), and make sure that NAV is configured to scan all files. For instructions on how to do this, read the document How to configure Norton AntiVirus to scan all files.
  3. Run a full system scan.
  4. Delete all files that are detected as Backdoor.BladeRunner.

To edit the registry:

CAUTION : We strongly recommend 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 back up 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 following key:

  4. In the right pane, delete the following value:

    System-Tray     <path to the server file>
  5. Click Registry, and then click Exit

Writeup By: Andre Post