Azure AD Account Credential Leaked — Sigma Rule

Rule metadata and linked tags

Author: Mark Morowczynski '@markmorow', Gloria Lee, '@gleeiamglo'. Source status: test; severity: high. Source dates: 2023-09-03 / not supplied.

{
  "product": "azure",
  "service": "riskdetection"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 3260fe5b2f6076e58eb9248b7d5333f6ed45bca1ed537cb856691e7ac441ef8e

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: Azure AD Account Credential Leaked
id: 19128e5e-4743-48dc-bd97-52e5775af817
status: test
description: Indicates that the user's valid credentials have been leaked.
references:
    - https://learn.microsoft.com/en-us/entra/id-protection/concept-identity-protection-risks#leaked-credentials
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#unusual-sign-ins
author: Mark Morowczynski '@markmorow', Gloria Lee, '@gleeiamglo'
date: 2023-09-03
tags:
    - attack.t1589
    - attack.reconnaissance
logsource:
    product: azure
    service: riskdetection
detection:
    selection:
        riskEventType: 'leakedCredentials'
    condition: selection
falsepositives:
    - A rare hash collision.
level: high

Original YAML and metadata in JSON

False positives

• A rare hash collision.

Source references

• https://learn.microsoft.com/en-us/entra/id-protection/concept-identity-protection-risks#leaked-credentials
• https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#unusual-sign-ins