Copying my own post from the Iran war thread, because it fits here just as well. There, because of the perpetrators (according to the French Foreign Minister), here, because of whom I suspected:
Here is one breaking news (link in German) I did not expect:
France believes Iran is behind the recent cyber-attacks on the refrigeration systems of French supermarket chains. Foreign Minister Jean-Noël Barrot said the Iranian ambassador to France had been summoned “to lodge a very strong protest against this extremely serious act”.
[…]
“This is the first large-scale cyberattack carried out for the purpose of sabotage on French territory, and it constitutes a serious breach of the nation’s interests and the security of the French people,” said Barrot.
It will therefore not go unpunished. “We will impose sanctions at European level against all those responsible for this attack and take all further appropriate and necessary measures – both public or covert – to respond to this attack and deter those who might wish to repeat it.”
[…]
In early November, the French blood bank was the target of such an attack. According to US media reports, several incidents are also under investigation in the United States. The European Commission convened a crisis meeting. Until now it was not clear who was behind the attacks.