Short bio

PUP.Optional.DNSUnlocker is Malwarebytes’ detection name for a family of adware programs that change the victim’s DNS settings on Windows systems.

Type and source of infection

PUP.Optional.DNSUnlocker redirects users to sites of its choosing by changing the DNS settings on the user’s machine. The potentially unwanted programs (PUPs) in this family are usually included in bundlers.


Malwarebytes protects users from PUP.Optional.DNSUnlocker by using real-time protection.

block PUP.Optional.DNSUnlocker

Malwarebytes blocks PUP.Optional.DNSUnlocker


Malwarebytes can detect and remove PUP.Optional.DNSUnlocker without further user interaction.

  1. Please download Malwarebytes to your desktop.
  2. Double-click mb3-setup-consumer-{version}.exe and follow the prompts to install the program.
  3. Then click Finish.
  4. Once the program has fully updated, select Scan Now on the Dashboard. Or select the Threat Scan from the Scan menu.
  5. If another update of the definitions is available, it will be implemented before the rest of the scanning procedure.
  6. When the scan is complete, make sure that all Threats are selected, and click Remove Selected.
  7. Restart your computer when prompted to do so.

In some cases you may be prompted for a second reboot. This is necessary to restore your Internet connection.

Add an exclusion

Should users wish to keep this program and exclude it from being detected in future scans, they can add the program to the exclusions list. Here’s how to do it.

The Exclusions tab includes a list of items to be excluded from scans. The items may include files, folders, websites, or applications that connect to the Internet, as well as previously detected exploits.

To access the exclusions in Malwarebytes:


You may see this type of entries in FRST logs:

Tcpip\..\Interfaces\{GUID for the internet connection}: [NameServer],

Related blog content

TopFlix: a DNS unlocker variant

DNS hijacks: what to look for