Largest US steel manufacturer puts production on the backburner after cyber attack

• Nucor confirmed suffering a cyberattack
• It was forced to shut down parts of its operations to contain the incident
• No threat actors claimed responsibility yet

Nucor, one of the biggest steel manufacturers in the United States, was forced to shut down parts of its operations to address an ongoing cyberattack. The company confirmed the news in a new 8-K form filed with the US Securities and Exchange Commission (SEC).

In the filing, Nucor said it recently observed an “unauthorized third party” accessing “certain information technology systems.” When it spotted the intrusion, it activated its incident response plan, brought in a third-party cybersecurity company to assist, and notified relevant law enforcement agencies.

However, it also took “potentially affected systems offline” to implement “other containment, remediation, or recovery measures”.

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