A multibillion-dollar cybersecurity firm specializing in exposing and fighting foreign cyberattacks said it was hacked by a sophisticated nation-state actor.

FireEye, a $3.5 billion Silicon Valley company famous for helping governments and its large corporate clients respond to cyberattacks, announced in a blog post on Tuesday the theft of secretive “Red Team” cybertools that mimic a cyber adversary’s online attacks and assist clients with defending against them.

Recommended Stories

Kremlin-backed hackers breach US Treasury and Commerce: Report

Scale of massive cyberattack that penetrated multiple government agencies prompts joint response from law enforcement and intelligence agencies

State-sponsored hackers target Ukraine