This analytic rule identifies when IAM users initiate updates to AWS Lambda code using the AWS CLI by analyzing CloudTrail logs for successful `UpdateFunctionCode` events. The detection mechanism is crucial since it highlights potential persistence mechanisms or unauthorized access attempts within an AWS environment. If an attacker successfully updates a Lambda function, they could seamlessly propagate malicious code, leading to significant security breaches. Therefore, monitoring these events can help maintain the integrity and security of cloud infrastructures against nefarious activities.