Apple wants to make changes
There's a mention of "Apple wants to make changes" in this Apple discussions thread.  Someone there ran Malwarebytes, which found "Adware.OperatorMac", and mentions the following files:

~/Library/Application Support/com.SearchSystem
~/Library/LaunchAgents/com.SearchSystem.plist


So, if you have those files, that would seem a good place to find out more.

I don't have 10.12.6 installed at the moment, but I do have machines running 10.11.6 and 10.13.6.  I don't have those files on either machine, so they aren't part of a standard install.

If you do have these files, perhaps you could post their contents as an update?