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June 08, 2026

VPC Flow Log Anomaly Detection: Amazon Detective + Athena ML

12 minutes

Learn how to implement VPC flow log anomaly detection by combining Amazon Detective's graph-based investigation with Athena ML queries to surface real network threats.

You'll learn:

How Amazon Detective ingests VPC flow logs and builds behavior baselines using machine learning automatically

Writing Athena ML USING FUNCTION queries against flow log data in S3 to flag statistical outliers in traffic volume or destination ports

How to tie Detective findings back to specific ENIs, IAM roles, and EC2 instances for faster blast-radius assessment

Where Athena ML ends and Detective begins — and why using both beats either alone for senior-level interviews

Common gotchas: log format versions, partition projection in Athena, and Detective's 48-hour data warm-up window

Keywords: VPC flow logs anomaly detection, Amazon Detective interview, Athena ML queries AWS, cloud security monitoring interview, AWS network threat detection

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