Ransomware Gang Behind Attack on UnitedHealth Says It Shut Down

A notorious ransomware gang said that it had shut down, but it left American prescription services in continued chaos after two weeks, showing the difficulty in trying to counter an enormous, shape-shifting criminal economy. ALPHV, the gang blamed for the massive Feb. 21 attack on UnitedHealth Group’s Change Healthcare unit, took in a ransomware payment of $22 million before shutting down and will probably reemerge under a new name, as its core group has done before, analysts said.