The company called the hackers a "highly sophisticated state-sponsored adversary."
"I've concluded we are witnessing an attack by a nation with top-tier offensive capabilities," CEO Kevin Mandia said in a blog post on the company website. "This attack is different from the tens of thousands of incidents we have responded to throughout the years. The attackers tailored their world-class capabilities specifically to target and attack FireEye. They are highly trained in operational security and executed with discipline and focus. They operated clandestinely, using methods that counter security tools and forensic examination. They used a novel combination of techniques not witnessed by us or our partners in the past."
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