Auction house hit by cyber-extortionist group RansomHub which claims to have sensitive information of at least 500,000 clients

A ransomware hack was the last thing the precarious fine art market needed – but that’s what it got when Christie’s website went down days before it began its all-important 20th and 21st century May auctions in New York.

Guillaume Cerutti, CEO of the French-owned auctioneer, gently called the attack a “technology security incident”. Christie’s posted its auction catalogs on a separate site, the sale went ahead with sales of $640m, and 10 days later the website came back to life.