1stProtect.ai vs FireEye Mandiant SunBurst Countermeasures: Side-by-Side Comparison (2026)

1stProtect.ai: Runtime enforcement platform with 22 modules on one SIGMA engine, offline-capable. built by 1stProtect.ai. Core capabilities include Single user-space SIGMA engine replacing multiple legacy security engines (EPP, EDR, DLP, IAM, ITDR, SASE), 22 protection modules covering credential theft, ransomware, data exfiltration, process injection, browser attacks, and agent self-defense, Offline-first policy enforcement with local policy engine cached in kernel memory — no cloud dependency required..

FireEye Mandiant SunBurst Countermeasures: FireEye Mandiant SunBurst Countermeasures: freely available rules for detecting malicious files and activity. built by Google..

Both serve the Detection Engineering market but differ in approach, feature depth, and target audience.

1stProtect.ai is developed by 1stProtect.ai. FireEye Mandiant SunBurst Countermeasures is open-source with 560 GitHub stars. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

1stProtect.ai and FireEye Mandiant SunBurst Countermeasures serve similar Detection Engineering use cases: both are Detection Engineering tools. Key differences: 1stProtect.ai is Commercial while FireEye Mandiant SunBurst Countermeasures is Free, FireEye Mandiant SunBurst Countermeasures is open-source. Review the feature comparison above to determine which fits your requirements.