A “zero-day” is a vulnerability that is known to or exploited by outsiders before the vendor has a patch for it. In standard parlance among security professionals, this means that Storm-0558 exploited zero-days in the Microsoft cloud services. Microsoft drove out the attackers on June 16 after a customer tipped off company researchers of the intrusion. Microsoft’s Threat Intelligence team said that Storm-0558, a China-based hacking outfit that conducts espionage on behalf of that country’s government, exploited them starting on May 15. In a post on Friday, the company indicated that the compromise resulted from three exploited vulnerabilities in either its Exchange Online email service or Azure Active Directory, an identity service that manages single sign-on and multifactor authentication for large organizations. On Friday, Microsoft attempted to explain the cause of a breach that gave hackers working for the Chinese government access to the email accounts of 25 organizations-reportedly including the US Departments of State and Commerce and other sensitive organizations. Getty Images | Aurich Lawson reader comments 86 with
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