Two cybercriminal collectives, Dark Storm Team and NoName057, have claimed to be behind the blackout that plunged Spain and parts of Portugal and France into darkness on Monday. In messages shared on the social media platforms Telegram and X, the pro-Russian hacking groups posted links to supposedly compromised Portuguese government networks.

Posting on X the Darkstorm handle shared the message: "Isn't it funny to cut off electricity to countries from home?", and the messages have shared links which claim disruptions to major Portuguese ministries such as the Ministry of the Interior, Ministry of Justice, Ministry of Environment and Climate Action and The Presidency of the Council of Ministers.

Check-Host data shows these services were either down or experiencing degraded performance at the time of posting.

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