Microsoft identified the Russian group Midnight Blizzard as the threat actors behind the breach, where they accessed a small percentage of corporate email accounts, including senior leadership team members.
The investigation started in early 2024, with evidence showing that the threat actors used the exfiltrated information to try to gain further unauthorized access.
Microsoft is currently notifying customers who had their communications exposed, providing increased detail and email correspondence that was accessed by the hackers.
The company remains committed to sharing information with customers as the investigation into the breach continues.
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