Killnet takes responsibility
https://www.bleepingcomputer.com/news/security/russian-hacktivists-launch-ddos-attacks-on-romanian-govt-sites/
The Romanian national cyber security and incident response team, DNSC, has issued a statement about a series of distributed denial-of-service (DDoS) attacks targeting several public websites managed by the state entities.
The attack has been claimed by a pro-Russian group calling themselves Killnet. They targeted servers that host public sites with a high number of requests or high volumes of data, essentially depleting their processing resources and causing them to become unavailable.