Atomicorp

Atomicorp, headquartered in Chantilly, Virginia and founded in 2015, is the primary commercial steward of OSSEC, the open-source host-based intrusion detection system (HIDS) originally created by Daniel B. Cid in 2004. Rather than building an entirely new detection engine, Atomicorp has spent years hardening and extending OSSEC into Atomic OSSEC, a commercial endpoint detection and response (EDR) and cloud workload protection product that keeps the open-source project’s transparency and platform breadth while adding enterprise support, management tooling, and compliance mapping.

That platform breadth is the company’s clearest differentiator: Atomic OSSEC supports not just current Windows, Linux, and macOS but also end-of-life and legacy operating systems (including Windows XP, Windows 7, AIX, and Solaris) and can run fully air-gapped, which matters directly to government, industrial control, and critical infrastructure environments that can’t simply retire decades-old systems still running production workloads. The product is approved within the U.S. Department of Defense’s Platform One DevSecOps ecosystem and maps to FISMA, NIST SP 800-53, NIST SP 800-171, CMMC, PCI DSS, HIPAA, JSIG, and CNSS compliance requirements, which is meaningful because DoD Platform One approval requires passing a real government security review rather than accepting a vendor’s self-attestation.

Atomicorp remains a small company (around 11 employees) despite this footprint, and lists customers including NASA, Airbus, Vodafone, and Samsung. That customer list is a genuine third-party credibility signal for a company this size, though the underlying detection technology — while continuously maintained — is architecturally an evolution of a two-decade-old open-source HIDS rather than a newer detection approach, and buyers should evaluate it specifically for legacy/hybrid environments where its OS coverage and air-gap capability are the deciding factor rather than as a general modern XDR replacement.