Note: Malwarebytes for Mac will remove malware installed on your Mac. But these malware being very invasive, will change user settings. A user has to reset those settings.Go step by step and test. 1. Remove unknown profiles if present. System Preferences > Profiles Open System Preferences, select “General and click the “Profiles” icon ( a checkmark on a gear) . When Profiles pane opens, select the unknown profile and click the minus button at the bottom. Section: Remove a configuration profile from your Mac Profiles: 2. Remove unknown extensions: Safari > Preferences > Extensions 3. Check for adware. Run the latest release of Malwarebytes for Mac to remove malware/adware, if installed on your Mac. For instructions: Click the “Scan Now” button. Once done, quit Malwarebytes for Mac. Restart the computer and relaunch Safari holding the shift key down. Scan for Malware again. Additional steps if necessary. 4. Reset search engine: 5. Reset Homepage. 6 Remove unknown Login items; 7. Restart your Mac. Relaunch Safari holding the Shift key down. If Safari's home page is stuckIn some cases, after being changed by adware or malware, Safari's home page can become stuck. You will be able to edit the Homepage field in Safari's preferences, but the change will not stick. This appears to be a bug, and there is an odd workaround. Try this:1. In Safari, choose Preferences from the Safari menu.2. In the window that opens, click the General icon (if necessary)3. Enter your desired home page in the "Homepage" field, but DO NOT press return!4. At the top of the window, click any of the other icons (eg, Tabs, AutoFill, etc).5. You may see a prompt asking for confirmation for changing the home page. If so, confirm.6. Switch back to the General page and check to make sure the home page has been changed.Credit: thomas_r, To remove the CA.Search.Yahoo.com redirect from your computer, follow these steps: In this first step, we will download and run Rkill to terminate malicious processes that may be running on your computer., It can happen due to a browser extension or a virus. 1). In edge use this link : edge://settings/search. 2). Check the search engine set in the "Search engine used in the address bar" Select Google or Bing. If it's already selected, check for extensions and remove any unwanted extensions you see..