National Defense Corp Listed by interlock Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

When a company that manufactures ammunition and explosives for military and law enforcement appears on a ransomware group's leak site, the practical concern for employees, contractors, partners and anyone whose details sit in its systems is straightforward: internal files may now be in the hands of criminals who trade or publish stolen data. Public reporting has not confirmed how many people are affected or exactly which records left the network, so the immediate stakes remain uncertain but real for anyone connected to the organisation.

On 24 February 2025, National Defense Corp was listed by the interlock ransomware group. The listing asserts that internal files were exfiltrated during a ransomware attack. Beyond that claim and the date of the report, key details such as the number of people affected remain unknown.

Breaking down the breach

According to the available record, National Defense Corp was listed by interlock on 24 February 2025. The group claims that internal files were taken as part of a ransomware attack. No public figure has been given for the number of individuals whose information may be involved, and the precise method of initial access, the duration of the intrusion, and the total volume of data removed have not been disclosed. The only data category named is “internal files.” Whether those files include employee records, supplier contracts, technical drawings, customer lists or other categories is unconfirmed. The listing itself is an assertion by the threat actor; independent verification of the full scope has not been published in the material available for this account.

Inside interlock

Interlock is a ransomware operation that has been observed conducting double-extortion campaigns: encrypting systems while also stealing data and threatening to publish it if a ransom is not paid. Like other groups in this category, it typically posts victim names on a dedicated leak site to increase pressure. Public reporting on interlock has described the use of common initial-access techniques such as phishing or exploitation of exposed remote services, followed by lateral movement, data staging and deployment of ransomware. The group has previously claimed attacks across manufacturing, professional services and other sectors. In this instance the only specific claim tied to National Defense Corp is the leak-site listing itself; no further statements attributed to interlock about this particular victim appear in the provided facts.

National Defense Corp and its sector

National Defense Corp operates in the defence-manufacturing sector. Available descriptive material identifies AMTEC as a manufacturer of lethal and non-lethal ammunition, explosives and cartridges supplied to military and law-enforcement customers. It is described as the largest-volume global producer of 40 mm grenade ammunition and fuzing, with capabilities that include precision assembly, explosive loading, metal forming and plating, and primary explosive manufacturing. The company is headquartered in Janesville, Wisconsin. Organisations of this type routinely hold technical specifications, production schedules, supplier and customer contact details, employee records, security clearances information and quality-control documentation. A breach at such an entity therefore carries implications that extend beyond ordinary commercial data loss, because the materials and relationships involved sit inside regulated defence supply chains.

What was likely exposed

The facts state only that internal files were exfiltrated. No inventory of file types, no sample documents and no confirmation of personal data categories have been released. Companies that manufacture ammunition and explosives typically maintain engineering drawings, bills of materials, test data, employee personnel files, contractor agreements, shipping records and correspondence with government or law-enforcement buyers. Any of those categories could be present among the stolen files, yet none has been verified as part of this incident. The exact contents therefore remain unconfirmed; readers should treat any more specific claims as speculative until further evidence appears.

Why it matters

For individuals, the practical risks include identity theft or targeted phishing if personal details such as names, addresses, national identification numbers or financial information were among the internal files. Employees and contractors may also face secondary social-engineering attempts that reference genuine internal knowledge. For the organisation, exposure of technical or contractual material can create competitive harm, regulatory scrutiny under defence-security rules, and disruption to production or supply relationships. Because the number of people affected is unknown and the precise data types are undisclosed, the full scale of these risks cannot yet be measured. The incident nevertheless illustrates how ransomware groups continue to target specialised manufacturers whose data holds both commercial and national-security value.

If your data was in this claimed breach

If you have worked for, contracted with or otherwise shared information with National Defense Corp or its related manufacturing operations, treat the possibility of exposure seriously even while details remain limited. Monitor financial accounts and credit reports for unusual activity, enable multi-factor authentication on email and other critical services, and be alert to phishing messages that appear to reference the company or its products. Change passwords that may have been reused across work and personal accounts. Readers can also run a free exposure scan of their email address to check whether that address has already appeared in known breach data sets; such a scan provides one additional data point while official notifications, if any, are still pending.

AICompiled with AI assistance from public sources and published under our editorial standards.