Santa is a binary white- or blacklisting daemon, being developed by the Google Macintosh Operations Team (largest contributor is Russel Hancox) for over 4 years now (not an official Google product!). Google Santa is being used by Google to protect and monitor their macOS machines internally, and has been called Santa because it keeps track of binaries that are naugthy or nice.
Article Link: https://isc.sans.edu/diary/rss/23693