Ensure there is a CloudWatch alarm created in your account that is triggered each time an unauthorized API call is made in order to respond quickly to any unapproved actions detected.
Using CloudWatch alarms to detect unauthorized AWS API requests can help you keep the AWS account secure. For example, when managing the permissions of a large number of IAM users mistakes can be made and certain users can receive unintended IAM API access. With CloudWatch alarms these unintended API calls can be automatically detected, enabling you to act fast and revoke their access.
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 “Authorization Failures”.
To determine if you have any CloudWatch alarms that are currently monitoring unauthorized API calls within your AWS account, 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 necessary alarm that will send SNS notifications whenever an authorization failure occurs within your AWS account.