Details: The attackers pierced the agency’s systems and those of around two dozen other organizations by using forged authentication tokens in a breach first made public by Microsoft on Tuesday night. The Microsoft investigators identified the infiltrators as Storm-0558, a group that primarily uses espionage, credential access and data theft to target government agencies in Western Europe. “Last month, U.S. government safeguards identified an intrusion in Microsoft’s cloud security, which affected unclassified systems,” White House National Security Council spokesperson Adam Hodge said in a statement Wednesday. “Officials immediately contacted Microsoft to find the source and vulnerability in their cloud service….