Malwarebytes has determined that ExtenBro is adware. These adware applications display advertisements not originating from the sites you are browsing. This particular one blocks access to domains related to security software to hinder victims from installing a remediation. You may see this type of task in your Scheduled Tasks. You can read here how to check for and, if necessary, remove Scheduled Task. This PUP creates a scheduled task. It will re-instate the malicious DNS settings. It would have blocked the installer before it became too late.”]
Source: https://forums.malwarebytes.com/topic/249242-removal-instructions-for-extenbro/