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AWS IAM Delete Policy

The following analytic detects the deletion of an IAM policy in AWS. It leverages AWS CloudTrail logs to identify `DeletePolicy` events, excluding those from AWS internal services. This activity is significant as unauthorized policy deletions can disrupt access controls and weaken security postures. If confirmed malicious, an attacker could remove critical security policies, potentially leading to privilege escalation, unauthorized access, or data exfiltration. Monitoring this behavior helps ensure that only authorized changes are made to IAM policies, maintaining the integrity and security of the AWS environment.

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Detection Logic

`cloudtrail` eventName=DeletePolicy (userAgent!=*.amazonaws.com)
| rename user_name as user
| stats count min(_time) as firstTime max(_time) as lastTime
    BY signature dest user
       user_agent src vendor_account
       vendor_region vendor_product
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `aws_iam_delete_policy_filter`

False Positives

⚠ This detection will require tuning to provide high fidelity detection capabilties. Tune based on src addresses (corporate offices, VPN terminations) or by groups of users. Not every user with AWS access should have permission to delete policies (least privilege). In addition, this may be saved seperately and tuned for failed or success attempts only.

Field Validations

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