This waring cam up on the Samsung Internet warning that it must to downloaded or the phone would be turned off. I can't get rid of it. I never downloaded, but the warning keeps coming up.
It states is it Samsung driven. It is called Rocket Cleaner System Optimizer.
In reading other post no one else seems to have come up with a way to erase it.
Has anyone been successful in getting it off the phone.
You installed a 3rd party app that came loaded with that malware. https://www.trendmicro.com/en_us/research/20/b/malicious-apps-on-google-play-communicate-with-trojan...
You can try booting in safe mode and deleting 3rd party apps.