AWS IAM Access Analyzer vs Microsoft Defender for Business

AWS IAM Access Analyzer helps teams set, verify, and refine permissions toward least privilege. It examines external, internal, and unused access to AWS resources. External analysis monitors for new or changed permissions that allow public or cross-account access; internal findings identify users and roles with access to S3, DynamoDB, or RDS resources. Unused-access findings can identify unused roles, IAM user keys and passwords, services, and actions. The service can generate fine-grained IAM policies from activity captured in AWS CloudTrail logs, and policy validation supplies security warnings, errors, general warnings, and best-practice suggestions. Custom policy checks can be integrated into CI/CD pipelines before deployment. The analyzer also provides last-accessed information for services and actions from select AWS services and connects with AWS Security Hub CSPM and Amazon EventBridge for findings workflows. AWS says automated reasoning technology applies mathematical logic to assess permissions. Policy validation, policy generation, and external access analysis are provided at no additional charge. Other listed charges include $0.0020 per custom policy-check API call, $0.20 per IAM role or user per month for unused-access analysis, and $9.00 per resource monitored per Region per month for internal access analysis.

Microsoft Defender for Business has no write-up on Specifiction yet; its figures are above.