Microsoft has now disclosed that DDoS attacks by a murky upstart were to blame for serious service disruptions back in early June.
In early June, sporadic but serious service disruptions plaguedflagship 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.
Microsoft's explanation in a blog post Friday evening followed a request by The Associated Press two days earlier. Slim on details, the post said the attacks "temporarily impacted availability" of some services. It said the attackers were focused on "disruption and publicity" and likely used rented cloud infrastructure and virtual private networks to bombard Microsoft servers from so-called botnets of zombie computers around the globe.
Pro-Russian hacking groups including Killnet — which the cybersecurity firm Mandiant says is Kremlin-affiliated — have been bombarding government and other websites of Ukraine's allies with DDoS attacks. In October, some U.S. airport sites were hit. Indeed, the techniques the attackers used are not old, said U.K. security researcher Kevin Beaumont. "One dates back to 2009," he said.
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