Apple macOS automatic EFI checks

https://twitter.com/osxreverser/status/912014988608491520

High Sierra automatically checks EFI firmware each week

Upgrading to High Sierra brings a new and significant security feature: your Mac will automatically check its EFI firmware. In a series of tweets, Xeno Kovah, one of the three engineers responsible for the new tool, has outlined how this works.[…]

High Sierra automatically checks EFI firmware each week

AFAICT, the article references Tweets from earlier today that appear to have subsequently been deleted from Twitter.