AWS Identity Center Identity Provider Change — Sigma Rule

Rule metadata and linked tags

Author: Michael McIntyre @wtfender. Source status: test; severity: high. Source dates: 2023-09-27 / not supplied.

{
  "product": "aws",
  "service": "cloudtrail"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 7ea2c37b143dacc7c240f87d69212a325155090b3535baa33ba38e8a7f58f145

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: AWS Identity Center Identity Provider Change
id: d3adb3ef-b7e7-4003-9092-1924c797db35
status: test
description: |
    Detects a change in the AWS Identity Center (FKA AWS SSO) identity provider.
    A change in identity provider allows an attacker to establish persistent access or escalate privileges via user impersonation.
references:
    - https://docs.aws.amazon.com/singlesignon/latest/userguide/app-enablement.html
    - https://docs.aws.amazon.com/singlesignon/latest/userguide/sso-info-in-cloudtrail.html
    - https://docs.aws.amazon.com/service-authorization/latest/reference/list_awsiamidentitycentersuccessortoawssinglesign-on.html
author: Michael McIntyre @wtfender
date: 2023-09-27
tags:
    - attack.persistence
    - attack.credential-access
    - attack.defense-impairment
    - attack.t1556
logsource:
    product: aws
    service: cloudtrail
detection:
    selection:
        eventSource:
            - 'sso-directory.amazonaws.com'
            - 'sso.amazonaws.com'
        eventName:
            - 'AssociateDirectory'
            - 'DisableExternalIdPConfigurationForDirectory'
            - 'DisassociateDirectory'
            - 'EnableExternalIdPConfigurationForDirectory'
    condition: selection
falsepositives:
    - Authorized changes to the AWS account's identity provider
level: high

Original YAML and metadata in JSON

False positives

• Authorized changes to the AWS account's identity provider

Source references

• https://docs.aws.amazon.com/singlesignon/latest/userguide/app-enablement.html
• https://docs.aws.amazon.com/singlesignon/latest/userguide/sso-info-in-cloudtrail.html
• https://docs.aws.amazon.com/service-authorization/latest/reference/list_awsiamidentitycentersuccessortoawssinglesign-on.html