A hacker group called RansomHub said it was behind the cyberattack that hit the Christie’s website just days before its marquee spring sales began, forcing the auction house to resort to alternatives to online bidding.
Cybersecurity experts said that RansomHub has emerged in recent months as an especially powerful ransomware group with possible connections to ALPHV, a network of Russian-speaking extortionists blamed for a cyberattack on Change Healthcare earlier this year. Hackers in that case appeared to receive a $22 million payment from the company’s owner, UnitedHealth Group, though United never admitted to sending the money. In April, RansomHub listed Change Healthcare as one of its victims and claimed to be holding onto four terabytes of stolen data.