Atomic OSSEC is a host-based intrusion detection system (HIDS) developed by Atomicorp, designed for government, DoD, and enterprise environments. It operates as a multi-platform security and compliance platform built on open-source OSSEC foundations. The platform provides continuous monitoring across servers, desktops, virtual machines, cloud workloads, and containers, including legacy systems such as Solaris, AIX, HP-UX, and end-of-life Windows environments. It supports major operating systems including Linux, macOS, and Windows. Core functions include: - Intrusion detection (HIDS and NIDS modules) at the host and network level - File integrity monitoring (FIM), including Windows registry monitoring - Log file analysis, collection, and retention - Vulnerability and compliance scanning against NIST SP 800-53, NIST SP 800-171, FISMA, HIPAA, PCI-DSS, GDPR, CIS, CMMC, JSIG, FIPS, and CNSS - Rootkit and malware detection - Memory monitoring and kernel-level anomaly detection - Active response including blocking, air gapping, and quarantining - Firewall policy management - Forensic copies of system and file changes - Threat intelligence integration - Role-based access control (least privilege) - Security information and event management (SIEM) capabilities Atomic OSSEC is approved within the Department of Defense Platform One DevSecOps Platform (DSOP) and supports air-gapped and disconnected environments. It includes machine learning-based correlation and analysis, centralized policy enforcement, and real-time alerting.