A. Create an Amazon EventBridge (Amazon CloudWatch Events) rule that invokes an AWS Lambda function when a security group changes. Configure the Lambda function to evaluate the security group for compliance, remove all inbound security group rules on all ports, and notify the SysOps team if the security group is noncompliant.
B. Create an AWS CloudTrail metric filter for security group changes. Create an Amazon CloudWatch alarm to notify the SysOps team through an Amazon Simple Notification Service (Amazon SNS) topic when the metric is greater than 0. Subscribe an AWS Lambda function to the SNS topic to remediate the security group rule by removing the rule.
C. Activate the AWS Config restricted-ssh managed rule. Add automatic remediation to the AWS Config rule by using the AWS Systems Manager Automation AWS-DisablePublicAccessForSecurityGroup runbook. Create an Amazon EventBridge (Amazon CloudWatch Events) rule to notify the SysOps team when the rule is noncompliant.
D. Create an AWS CloudTrail metric filter for security group changes. Create an Amazon CloudWatch alarm for when the metric is greater than 0. Add an AWS Systems Manager action to the CloudWatch alarm to suspend the security group by using the Systems Manager Automation AWS-DisablePublicAccessForSecurityGroup runbook when the alarm is in ALARM state. Add an Amazon Simple Notification Service (Amazon SNS) topic as a second target to notify the SysOps team.