Star Lab’s Warden is a minimally invasive technology designed specifically to detect advanced cyber threats inside unique defense compute environments, e.g., systems running customized Linux and real-time operating systems. Consisting of a lightweight sensor package, an ensemble of detectors, and an artificial neural network, Warden identifies potential cyber threats and reports them via the syslog mechanism. Warden’s functionality has been prototyped, tested, and verified using realistic test and training environments for the Aegis Weapon System. Star Lab, an embedded systems security company, is dedicated to protecting devices and systems operating in open, hostile environments. Our goal is for prime contractors to integrate Warden as they modernize combat systems to defeat never-before-seen cyber-attacks.