Unfamiliar IAM user retrieved secret from AWS Secrets Manager
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Goal
Detect when a previously unseen IAM user retrieves secrets from AWS Secrets Manager.
Strategy
This rule lets you monitor the GetSecretValue CloudTrail API calls to detect when a secret is retrieved. It does this by inspecting the IAM users accessing secrets within your AWS account over a 7-day window. Newly detected users after this 7-day window will generate security signals.
Triage and response
- Determine whether the IAM user:
{{@userIdentity.arn}} is expected to access the Secrets Manager and the secrets within @requestParameters.secretId. - If the action is legitimate, consider including the user in a suppression list. See Best practices for creating detection rules with Datadog Cloud SIEM for more information.
- If the action shouldn’t have happened:
- Contact the user:
{{@userIdentity.arn}} and see if they made the API call. - Use the Cloud SIEM - User Investigation dashboard to see if the user
{{@userIdentity.arn}} has taken other actions. - Use the Cloud SIEM - IP Investigation dashboard to see if there’s more traffic from the IP
{{@network.client.ip}}.
- If the results of the triage indicate that an attacker has taken the action, begin your company’s incident response process as well as an investigation.
