Nucor

Nucor, North America's largest steel producer and recycler, experienced a cybersecurity incident that resulted in the theft of data from its network. The attack caused a temporary halt in production at some facilities and limited access to certain IT applications. The company took proactive measures by temporarily halting production operations and notifying law enforcement and cybersecurity experts. The nature of the attack and the extent of data exfiltrated are still under investigation, but it is confirmed that threat actors exfiltrated limited data. The company has restored access to affected systems and believes the threat actors have been evicted.

Source: https://www.bleepingcomputer.com/news/security/steel-giant-nucor-confirms-hackers-stole-data-in-recent-breach/

TPRM report: https://scoringcyber.rankiteo.com/company/nucor-corporation

"id": "nuc607062325",
"linkid": "nucor-corporation",
"type": "Breach",
"date": "6/2025",
"severity": "100",
"impact": "",
"explanation": "Attack threatening the organization's existence: Attack in which the personal and financial information is compromised"

{'affected_entities': [{'industry': 'Steel Production and Recycling',
                        'location': ['U.S.', 'Mexico', 'Canada'],
                        'name': 'Nucor',
                        'size': '32,000 employees',
                        'type': 'Company'}],
 'data_breach': {'data_exfiltration': 'Yes',
                 'type_of_data_compromised': 'Limited data'},
 'description': "Nucor, North America's largest steel producer and recycler, "
                'has confirmed that attackers behind a recent cybersecurity '
                "incident have also stolen data from the company's network.",
 'impact': {'data_compromised': 'Limited data',
            'downtime': 'Temporary limitation of access to portions of the '
                        "Company's information technology applications",
            'operational_impact': 'Halted production at some facilities',
            'systems_affected': 'Some systems'},
 'investigation_status': 'Ongoing',
 'references': [{'source': 'BleepingComputer'}],
 'regulatory_compliance': {'regulatory_notifications': 'Will carry out any '
                                                       'appropriate '
                                                       'notifications to '
                                                       'regulatory agencies'},
 'response': {'containment_measures': 'Took down some systems',
              'law_enforcement_notified': 'Yes',
              'recovery_measures': 'Restored access to systems',
              'third_party_assistance': 'Hired external cybersecurity experts'},
 'title': 'Data Breach at Nucor',
 'type': 'Data Breach'}