In early June, sporadic but serious service disruptions plagued Microsoft's flagship office suite - including the Outlook email and OneDrive file-sharing apps - and cloud computing platform. A shadowy hacktivist group claimed responsibility, saying it flooded the sites with junk traffic in distributed denial-of-service attacks.
Initially reticent to name the cause, Microsoft has now disclosed that DDoS attacks by the murky upstart were indeed to blame.
“We know some resources were inaccessible for some, but not others. This often happens with DDoS of globally distributed systems,” Williams added. He said Microsoft's apparent unwillingness to provide an objective measure of customer impact “probably speaks to the magnitude.” Edward Amoroso, NYU professor and CEO of TAG Cyber, said the Microsoft incident highlights how DDoS attacks remain “a significant risk that we all just agree to avoid talking about. It's not controversial to call this an unsolved problem.”
Serious impacts from the Microsoft 365 office suite interruptions were reported on Monday June 5, peaking at 18,000 outage and problem reports on the tracker Downdetector shortly after 11 a.m. Eastern time.
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