https://techtalk.pcmatic.com/2019/01/09/ransomware-attacks-2...
I think the date should be December 2019 (not January), judging from the list of incidents by month.
One I know of, against Regis University in Colorado, occurred in late August (first reports from August 22).
https://www.regisupdates.com/regis-quick-updates/test-post
It's mainly a Windows shop. Lots of disruptions for weeks (I teach there part-time, but was not teaching that term). By November(!) things were pretty much back to normal:
https://www.regisupdates.com/regis-quick-updates/its-updates...