National Defense Corporation victim of ransomware attack; discloses breach and declines to pay any ransom.

InterLock’s darkweb leak site claims it breached AMTEC/National Defense Corporation, exfiltrating 4,200 GB of data (2.9M files) and fully encrypting AMTEC, Tech Ord, and PRESTO systems; screenshots were shared as proof. While NDC did not publicly disclose details, National Presto Industries filed an SEC 8-K noting a March 1, 2025 material cybersecurity incident causing outages across operations and an ongoing forensic investigation with law enforcement notification. InterLock reported unsuccessful negotiations, while an alleged NDC message asserted required disclosures had been made and downplayed third‑party value of stolen data.