AWS IAM policy changed

Classification:

attack

Tactic:

TA0003-persistence

Technique:

T1098-account-manipulation

Framework:

cis-aws

Control:

4.4

Goal

Detect a change to an AWS IAM Policy.

Strategy

This rule lets you monitor CloudTrail and detect when any event pertaining to an AWS IAM policy is detected with one of the following API calls:

• DeleteGroupPolicy
• DeleteRolePolicy
• DeleteUserPolicy
• PutGroupPolicy
• PutRolePolicy
• PutUserPolicy
• CreatePolicy
• DeletePolicy
• SetPolicyVersion
• CreatePolicyVersion
• DeletePolicyVersion
• AttachRolePolicy
• DetachRolePolicy
• AttachUserPolicy
• DetachUserPolicy
• AttachGroupPolicy
• DetachGroupPolicy

Triage and response

1. Review the IAM Policy change and ensure it does not negatively impact your risk in relation to authentication or authorization controls.
2. If risk is increased, contact the individual that used the arn: {{@userIdentity.arn}} and determine if {{@evt.name}} API calls were made by them.

Changelog

5 April 2022 - Updated rule and signal message.