The group named NoName057(16) admits to being behind the Denial of Service attack on the Finnish parliament's website last Tuesday, just the day that the news of its annexation to NATO was given. This same group also claimed responsibility for the attack that occurred last August, also against the same website.
On the other hand, the hacktivist gang Killnet is the one who appears to be behind a similar attack in Israel against CheckPoint, several universities and health centers. This gang has also increased its attacks against U.S. entities this year.
There is no simple solution for attacks of this type, as it is possible to exploit various vulnerabilities. Protective measures require increasingly large and complex organizations. Increasingly defense measures must include more tasks and more specialized personnel.
Fountain: Tech Republic