Anomalous amount of access denied events for AWS EC2 Instance

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Goal

Detect when an EC2 instance is assessing privileges in AWS through various enumeration and discovery techniques.

Strategy

Monitor CloudTrail logs to identify when an EC2 instance (@userIdentity.session_name:i-*") generates an anomalous amount of AccessDenied events.

Triage and response

Determine what events the EC2 instance {{@userIdentity.session_name}} are generating in the time frame of the signal.
If the root cause is not a misconfiguration, investigate any other signals around the same time of the signal by looking at the Host Investigation dashboard.