American steel giant Nucor Corporation revealed on Wednesday that production has been disrupted due to a cyberattack.
Nucor, which advertises itself as the largest steel manufacturer and recycler in North America, informed the SEC that it recently detected a cybersecurity incident involving unauthorized access to its IT systems.
In response to the incident, the company took some systems offline and implemented other unspecified containment, remediation or recovery measures.
It has also informed law enforcement and called in outside cybersecurity experts to assist with the investigation.
“As of the date of this filing and in an abundance of caution, the Company temporarily and proactively halted certain production operations at various locations,” Nucor explained. “However, the Company is currently in the process of restarting the affected operations.”
The North Carolina-based company has yet to determine whether the incident will have a material impact.
It’s possible that Nucor has been targeted in a ransomware attack, but the company has not shared any information on who may be behind the attack and no known ransomware group has taken credit for the incident.
SecurityWeek has reached out to Nucor to find out if this was a ransomware attack and whether any files have been stolen. This article will be updated if the company responds.
Nucor would not be the only major steelmaker targeted by ransomware in recent years. Germany’s Thyssenkrupp had one of its automotive units disrupted by a ransomware attack in 2024.
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