Discovered: December 15, 2000
Updated: February 13, 2007 11:34:49 AM
Type: Trojan Horse

JS.Seeker is a Trojan horse program that alters the default startup and search pages of your Web browser.

The Trojan horse sometimes arrives as a file named Runme.hta. This file runs only if the Windows Scripting Host is installed.

There are other things that you can do to protect your system from this type of Trojan Horse.

Script Blocking

  • If you are using Norton AntiVirus 2001, a free program update that includes Script Blocking is available. Please run LiveUpdate to obtain this.
  • For other versions of Norton AntiVirus, SARC offers a tool to disable the Windows Scripting Host.

Install the Microsoft patch
This worm takes advantage of a known Microsoft Outlook/Outlook Express security hole. Microsoft has provided a patch for this security hole at

Antivirus Protection Dates

  • Initial Rapid Release version December 19, 2000
  • Latest Rapid Release version January 19, 2018 revision 022
  • Initial Daily Certified version December 19, 2000
  • Latest Daily Certified version January 20, 2018 revision 002

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

Discovered: December 15, 2000
Updated: February 13, 2007 11:34:49 AM
Type: Trojan Horse

When JS.Seeker is executed, it makes changes to the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Start Page
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Search Bar
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Default_Page_URL
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Default_Search_URL
HKEY_CURRENT_USER\Software\Netscape\Netscape Navigator\Main\Home Page

The original registry values are saved in the \Windows folder as Backup1.reg and Backup2.reg .

The Trojan horse creates the file Homereg111.reg in the \Windows folder and sets the previously mentioned registry keys to its own values. It then runs Removeit.hta, which deletes the file Runme.hta from the C:\Windows\Start Menu\Programs\Startup folder.

JS.Seeker also creates the Prefs.js file in the \Windows folder. This is a JavaScript file that changes Netscape Preferences to its own.


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.

Discovered: December 15, 2000
Updated: February 13, 2007 11:34:49 AM
Type: Trojan Horse

To remove JS.Seeker you need to:

  • Run a full system scan and delete any files that are detected as infected.
  • Delete the Homereg111.reg and Prefs.js files.
  • Restore original settings by merging Backup1.reg and Backup2.reg into the registry.
For instructions on how to do this, see the sections that follow.

To run a full system scan:
  1. Make sure that Norton AntiVirus is set to scan all files.
  2. Run a complete system scan.
  3. Delete all files found to be infected with JS.Seeker.

To find and delete the Homereg111.reg and Prefs.js files:
  1. Click Start, point to Find, and click Files or Folders.
  2. Make sure that Look in is set to (C:) and that Include subfolders is checked.
  3. In the Named box, type the following file names:

    homereg111.reg prefs.js
  4. Click Find Now. Windows will find the files (if they exist) and display them in the lower pane of the Find dialog box.

    NOTE: You are about to delete files. One of them is Prefs.js. If you are using Netscape, there is a legitimate Netscape file that is named Prefs.js. If you delete the legitimate Prefs.js, it deletes your Netscape preferences. If you use Netscape, and do not want to do this, when the files are found, just delete copies of Prefs.js that are not in a Netscape subfolder. For example, if you find a copy of Prefs.js in the \Windows folder, that does not belong to Netscape and should be deleted.
  5. Select each displayed file, press Delete, and click Yes to confirm.
  6. Leave the Find: All Files window open, and go on to the next section.

To find and merge Backup1.reg and Backup2.reg into the registry:
  1. Click New Search, and click OK to confirm.
  2. Make sure that Look in is set to (C:) and that Include subfolders is checked.
  3. In the Named box, type the following file names:

    backup1.reg backup2.reg
  4. When found, double-click each of these files to restore the registry settings.
  5. Once the registry has been restored and the computer is working correctly, delete Backup1.reg and Backup2.reg.