Microsoft says early June service outages were cyberattacks

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“Beginning in early June 2023, Microsoft identified surges in traffic against some services that temporarily impacted availability'” the company said in a blog post.

Microsoft said it opened an investigation and began tracking the DDoS activity by the threat actor it refers to as Storm-1359 after it identified the threat.

Microsoft did not immediately respond to a request by Reuters as to whether the company had identified the party responsible for the attack.

DDoS attacks work by directing high volumes of internet traffic towards targeted servers in a relatively unsophisticated bid to knock them offline.

Microsoft’s 365 software suite, including Teams and Outlook, were down for more than two hours for over thousands of users on June 5 and a brief recurrence the following morning. That was the fourth such outage for Microsoft in a year.