Threat Descriptons



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DNS Unlocker is a utility program that also displays unsolicited advertising content during web browsing.


Once detected, the block it from running and prompt you for a desired action.

Manual removal

You can remove the program manually if you no longer want it on your computer.

Note: You will need administrator rights to manually uninstall the program.

  • Uninstall the program

    1. Log in to the user account
    2. Go to Start > Control Panel > Programs and Features
    3. In the list of installed programs, select 'DNS Unlocker' and then click Uninstall
    4. Log in as Administrator
    5. Go to Start > Control Panel . Under 'Programs', click Uninstall a program
    6. In the list of installed programs, select 'DNS Unlocker' and then click Uninstall
    7. Return to Control Panel and under 'Network and Programs', click View network status and tasks.
    8. In the 'Network and Sharing Center' page, under 'View your active networks', click Local Area Connection.
    9. In the 'Local Area Connection Status' menu, click Properties. Under 'This connection uses the following items', click Internet Protocol Version 4, then click Properties.
    10. On the 'General' tab, select 'Obtain DNS server address automatically' and click Advanced...
    11. On the 'DNS' tab, under 'DNS server addresses, in order of use', select each of the DNS addresses listed and click Remove to remove them
    12. Click OK to save all the changes.
  • Flush the local DNS cache

    Flush the computer's DNS cache to remove any changes the program made to saved website information before it was uninstalled. Flushing will clear all the saved details, so that the computer can check and re-save a website's details the next time it tries to load the site during a web browsing session.

    • Open the Start menu
    • In the Search programs and files search box, type in cmd and press Enter
    • In the command prompt box, type in ipconfig /flushdns and press Enter
  • Clear the browser DNS cache

    You may also elect to clear the browser's DNS cache to remove any changes the program made before it was uninstalled. Clearing will reset your browser's DNS cache to its default settings.

Exclude it from scanning

If you are aware of and accept the potential risk associated with this program, you can configure the F-Secure security product to exclude it from further scanning.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

DNS Unlocker is typically distributed bundled together with other software. It is promoted as a utility program that gives users more control over the DNS settings used by their computers (so that users may, for example, bypass content controls that restrict web browsing).

When installed and run, the program also injects advertising content during the web browsing session. These ads are marked as 'Ads by DNS-Unlocker', but may be considered unsolicited and annoying to the user.

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