Miljödata is an IT systems supplier for roughly 80% of Sweden's municipalities. The company disclosed the incident on August 25, saying that the attackers stole data and demanded 1.5 Bitcoin to not leak it.

Related:

https://www.bleepingcomputer.com/news/security/it-system-sup...

https://www.svt.se/nyheter/inrikes/cyberattack-i-datasystem-...