Ensure there is a CloudWatch alarm created in your AWS account that is triggered each time a configuration change is made at the CloudTrail service level. The alarm must fire when an API call is made to create, update or delete an AWS CloudTrail trail or when the logging process defined by a trail is stopped or started.
Using CloudWatch alarms to detect AWS CloudTrail config changes can help you to maintain the integrity of the service configuration and prevent AWS users from covering their tracks after performing unauthorized actions within your AWS account.
Note 1: For this rule Cloud Conformity assumes that the CloudTrail service is already enabled to stream event log data to CloudWatch in your AWS account, otherwise see this rule to enable AWS Cloudtrail – CloudWatch integration.
Note 2: You can specify a custom name for the alarm using the rule configuration settings available on Cloud Conformity dashboard. Otherwise, the default name used for this rule will be “CloudTrail Changes”.
To determine if you have any CloudWatch alarms that are currently monitoring AWS CloudTrail configuration changes, perform the following:
Step 1: Create a Simple Notification Service (SNS) topic and the necessary subscriptions to send notifications whenever the CloudWatch alarm is triggered.
Step 2: Create AWS CloudWatch metric filter and the required alarm that will send SNS notifications whenever an AWS CloudTrail configuration change is being made.