I work for the city of Skanderborg in Denmark and we do a few things to avoid it. One is to monitor our entire storage for malicious code and automatically isolate suspicious activity. Another is to do frequent backups of everything on our network shares and one drive for business which is where most employee data that doesn’t belong in a specific system lives. Our servers, database clusters and vital systems are all isolated from the employee network and also frequently backed up. When we get hit, it’s usually employees reading private email and we’re typically able to isolate the ransomware before it spreads from that specific employees network share. Once we kill it, we restore files to the most recent backup and roll their machine.

It’s worked well so far, but we do have an IT crew that would make most places jealous and IT is an area that is notoriously undervalued in the public sector.