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Goal
Detect when an AMI is made public.
Strategy
This rule lets you monitor these CloudTrail API calls to detect if an AMI is made public.
This rule inspects the @requestParameters.launchPermission.add.items.group array to determine if the string all is contained. This is the indicator which means the image is made public.
Triage and response
- Determine if the AMI (
@requestParameters.imageId) should be made public using CloudTrail logs. - Investigate the following ARN (
{{@userIdentity.arn}}) that made the AMI public. - Contact the user to see if they intended to make the image public.
- If the user did not make the API call:
- Rotate the credentials.
- Investigate if the same credentials made other unauthorized API calls.
- Revert AMI permissions to the original state.
- Begin your company’s IR process and investigate.
Changelog
11 November 2022 - Add steps to Triage and response section.
