Temperatures are rising: grocery suppliers across Europe suffer from cyber attacks on freezers -. The Guardian. These incidents could become "harbingers" of bigger threats posed by Russian hackers. The UK's National Cyber Security Center (NSCS) is working with food suppliers after hackers raised the temperature in supermarket freezers across Europe. Attacks on "dummy" controls, deliberately posted online to attract potential hackers, show similar characteristics to Russian-linked malware, cyber security experts said. Retailers in Belgium, Estonia, Finland, Ireland, Luxembourg, the Netherlands and Sweden reported problems with cooling systems - some reaching temperatures of up to 50 degrees Celsius - and several companies confirmed they had been breached. Similar events were recorded in France in October. NCSC representatives did not directly name the culprits, but it is known that the hackers exploited vulnerabilities that existed "for a long time." The British Independent Meat Suppliers Association said some of its more than 300 members were affected by being "victims" of the hacking attack. One company reported that temperatures in their refrigerators rose to 100 degrees Celsius, and several others reported thawing. Hackers changed the settings of several devices, setting the defrost mode to more than four hours at a temperature of 150 degrees Celsius, said Alex Pearce of Langridge Organics. Cybersecurity researchers said attacks on Danfoss refrigerator control system simulators resembled recent Russia-related operations. "Our attention was drawn to the overlap between the infrastructure involved in the latest investigations and infrastructure we previously linked to Russia," said Xavier Belkens, head of the cyber protection company Lufobis.