LoFP / resource policy changes may be performed by administrators, infrastructure-as-code pipelines, or automation during legitimate onboarding, sharing, or access-management activities. verify whether the user identity, user agent, and source ip are expected to manage bedrock resource policies in your environment. known automation can be exempted from the rule.

Techniques

• T1098

Sample rules

AWS Bedrock Resource-Based Policy Modified or Deleted

• source: elastic
• technicques:
  • T1098

Description

Detects modification or deletion of resource-based access policies on AWS Bedrock resources via the PutResourcePolicy and DeleteResourcePolicy API calls. Resource-based policies govern which principals (including external accounts) may access Bedrock resources such as agents, knowledge bases, and custom models. An adversary may attach a resource policy granting an external or unexpected principal access to a Bedrock resource to establish persistence or enable cross-account access, or may delete an existing policy to weaken access controls. These changes should be validated for principal ownership and least-privilege intent.

Detection logic

data_stream.dataset: "aws.cloudtrail" and
    event.provider: "bedrock.amazonaws.com" and
    event.action: ("PutResourcePolicy" or "DeleteResourcePolicy") and
    event.outcome: "success"