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Last updated: April 29, 2026
CloudTrail, Activity Log, Audit Log. Identity-first detection. GuardDuty/Defender/SCC. Maturity model.
Traditional SIEM was built for on-prem network + endpoint telemetry. Cloud-native environments produce different events at different scale — API calls, config changes, sign-ins from global IPs, serverless invocations, container spawns. Mature cloud detection requires specific tooling, rules, and investigation workflows. Most programs are behind.
Why cloud detection is different
- Volume + velocity: CloudTrail, Azure Activity, GCP Audit Logs generate millions of events per account per day.
- Most events are benign: auto-scaling spawns instances, Lambdas run routinely, CI deploys update configs. Signal-to-noise ratio brutal.
- Attacker moves are one API call: single CreateUser, AttachPolicy, AssumeRole — easy to miss in volume.
- Geographic distribution: legitimate activity from many IPs globally; anomaly detection must account for normal distribution.
- Identity-first: most attacks are credential compromises; detection centers on identity, not network.
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