Who are the Russian cyber gang Qilin?

Russian cyber gang Qilin was responsible for a ransomware attack on Synnovis, a pathology services provider, causing major disruptions in London hospitals, including cancellations of operations and blood transfusions. Qilin uses dark web websites for attacks, previously targeting Big Issue Group, courts in Victoria, Australia, and Yanfeng Automotive Interiors. Officials are investigating the recent incident.