There was some writeup from a few years back https://e-estonia.com/estonian-e-state-has-experienced-several-hacking-incidents-as-of-late-what-are-the-lessons-le

There was some writeup from a few years back https://e-estonia.com/estonian-e-state-has-experienced-several-hacking-incidents-as-of-late-what-are-the-lessons-learned/ https://e-estonia.com/estonian-e-state-has-experienced-sever... It’s not going into granularity you may want though.