Nucor Corp. on Wednesday disclosed a cyberattack involving an unauthorized third party that gained access to parts of its IT systems.
In a filing with the Securities and Exchange Commission, the Charlotte, N.C.-based steelmaker said it proactively took potentially affected systems offline and implemented other containment measures. As a precautionary measure, company halted production at various locations as of Tuesday, the day the incident disclosure was filed with regulators.
Nucor has notified federal law enforcement and is working with external cybersecurity specialists to investigate the incident.
The company said it will continue to monitor the timing and materiality of the incident. It said it is currently in the process of restarting affected operations, but it did not specify a schedule for full resumption.
The company describes itself as the largest and most diversified steel and steel-products company in North America, claiming to produce about 25% of all raw steel in the U.S.
