How Harden Runner Detected the Sha1-Hulud Supply Chain Attack in CNCF's Backstage Repository

StepSecurity's Harden Runner successfully detected the Shai-Hulud supply chain attack targeting CNCF's Backstage repository through npm package compromise. The attack involved malicious packages in the npm ecosystem that were detected using runtime monitoring and baseline anomaly detection techniques. This case study demonstrates how security tools can identify supply chain attacks by monitoring runtime behavior and detecting deviations from normal patterns. The detection occurred in a critical open-source project maintained by the Cloud Native Computing Foundation, highlighting the importance of supply chain security monitoring in enterprise environments.