1. Remove Adware
Run the latest release of Malwarebytes for Mac to remove malware/adware, if installed on your Mac.
For instructions: Install Malwarebytes for Mac Uninstall Malwarebytes for Mac
Click the “Scan Now” button. Once done, quit Malwarebytes for Mac.
Restart the computer and relaunch Safari holding the shift key down
Repeat the scan couple of times.
2. Additional steps to take if necessary.
1. Remove unknown profiles.
System Preferences > Profiles
Open System Preferences, 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.
2. Remove unknown extensions: https://support.apple.com/guide/safari/use-safari-extensions-sfri32508/mac
3. Reset search engine: https://support.apple.com/guide/safari/customize-your-search-ibrwe75c2a3c/mac
4. Reset Homepage. https://support.apple.com/guide/safari/set-your-homepage-ibrw1020/mac
5. Ref: https://forums.malwarebytes.com/topic/236261-how-to-remove-weknow-malware-and-others/
6. Shutdown the computer from menu. Start your Mac using the Power button.