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US State Department have gone on the record about how they found the Microsoft 365 data breach.
They set up a detection rule called Big Yellow Taxi two years ago to look for unknown AppIDs in OfficeActivity, which ultimately saved Microsoft’s ass.
https://www.politico.com/news/2023/09/15/digital-tripwire-helped-state-uncover-chinese-hack-00115973
POLITICOHow the State Dept discovered that Chinese hackers were reading its emails The State Department relied on a clever alert system to uncover and unravel an advanced Chinese spying campaign that involved breaches of officials’ emails.