Short bio

Trojan.ForcedExtension.ChrPRST is Malwarebytes’ detection name for a Chrome extension called Cookies On-Off.


Trojan.ForcedExtension.ChrPRST shows advertisements in new tabs and pop-unders each time the user opens a new tab or visits a new site. Some of these advertisements will lead to additional PUPs and malware.

Type and source of the infection

Trojan.ForcedExtension.ChrPRST was forced upon visitors of certain compromised sites. The extension is protected against removal by a Chrome policy.


Trojan.ForcedExtension.ChrPRST is a “removal only” detection. Malwarebytes protects against Trojan.ForcedExtension.ChrPRST by blocking the sites that push this extension.


Malwarebytes can detect and remove Trojan.ForcedExtension.ChrPRST 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.


Chrome extension:


Select your language