France accuses Iran of supermarket fridge hacking

France has accused Iran of being behind cyber-attacks that raised the temperatures of supermarket fridges and freezers.French Foreign Minister Jean-Noël Barrot said the attack was carried out by the Islamic Revolutionary Guard Corps (IRGC) of Iran.He said the attack was "unprecedented in both its scale and its level of aggression", adding that the country would "implement sanctions at the European level against all those responsible for this attack".The cyber-attack last month saw fridges and freezers in hundreds of supermarkets across France heated up, which spoilt fresh and frozen food estimated to be worth millions of euros.Then last week, dozens of supermarkets across seven other European countries were also impacted by a cyber-attack that targeted fridges and freezers. It is not known if the instances are linked.Iran is yet to respond to Barrot's allegations.Barrot said of the attack on France's supermarkets: "It marks the first large-scale cyberattack aimed at sabotage on our national territory, and it constitutes a major attack on the nation's interests and the security of the French people."He said the government had summoned the Iranian ambassador to Paris to "lodge a very strong protest against this extremely grave act". France will take "any other necessary and proportionate measures" to respond to the incident and "deter anyone who might seek to repeat it", Barrot added.Separately on Monday, the Paris prosecutor said an investigation had been opened into the head of an offensive cyber unit associated with Iran's Islamic Revolutionary Guard Corps (IRGC) as well as his two deputies.Laure Beccuau named the unit as Shahid Kaveh, which she said had an affiliation with the electronic and cyber centre of the IRGC.On 11 October, hackers gained control of the software that regulates the temperatures of the refrigeration units used in many of France's supermarkets.More than 100 of Coopérative U's supermarkets were hit, as well as 180 stores from Intermarché and its Netto brand. In some stores, temperatures of the fridges reportedly rose to 50C (120F) overnight.Other major food retailers including Carrefour, Monoprix and E.Leclerc were also hit by the attack, which targeted software provided by Danish engineering firm Danfoss.The software allows retailers to manage their cold units remotely.Earlier this month a second wave of hacks took place, hitting more than 100 stores across Europe. Supermarkets in Belgium and Luxembourg were affected, while a smaller number of shops were hit in Sweden, Ireland, the Netherlands, Estonia and Finland.Since the waves of attacks on freezers, experts have been speculating which hacking groups could be responsible, with Iran being on a list of potential suspects.In spite of a pair of Russian-aligned hacktivist groups claiming they were responsible on Wednesday, few believed them.The French government has not said how it reached the conclusion that Iran was responsible, and attribution of cyber attacks is extremely hard as hackers are able to hide their locations.