The company was initially reticent to name the cause of the security breach.
“We really have no way to measure the impact if Microsoft doesn’t provide that info,” said Jake Williams, a prominent cybersecurity researcher and a former National Security Agency offensive hacker. Williams said he was not aware of Outlook previously being attacked at this scale.
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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