Photo: Muhammad FAROOQ / AFPSource: AFPAustralia has identified the Russian mastermind behind a crippling cyber attack, unmasking the 33-year-old hacker for the first time on Tuesday and linking him to an international crime syndicate. Hackers infiltrated Australian private health insurer Medibank in November 2022, stealing sensitive medical records and leaking them on the dark web. Among the 9.7 million customers caught up in the high-profile cyber attack -- one of the country's worst data breaches -- was Australian Prime Minister Anthony Albanese. Australian intelligence agencies have long suspected Russian hackers were behind the breach, which has previously been tentatively linked to the REvil ransomware collective. "Medibank in my view was the single most devastating cyber attack we have experienced as a nation," O'Neil said Tuesday.