NUCOR CORP

Nucor took steel mills offline across multiple sites after a threat actor reached its corporate IT systems, the wall between office networks and the plant floor apparently thinner than the org chart suggested. The company calls the stolen data limited and the impact immaterial, though no one has said what left, how much, or who took it, and no group has claimed the attack. When an intrusion in the back office can idle a blast furnace, the boundary was never really there.