Sigma rule: Users Authenticating To Other Azure AD Tenants

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-c161351750a2, updated 2026-05-08T00:00:00.000Z.

Rule

Title
Users Authenticating To Other Azure AD Tenants
Status
test
Level
medium
Author
MikeDuddington, '@dudders1'
Date
2022-06-30
Modified
2026-05-08
File
rules-placeholder/cloud/azure/signin_logs/azure_users_authenticating_to_other_azure_ad_tenants.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detect when users in your Azure AD tenant are authenticating to other Azure AD Tenants.

Log source

product
azure
service
signinlogs

Detection

selection:
    resultType: 0
    homeTenantId|expand: '%HomeTenantID%'
filter_main_hometenantid:
    resourceTenantId|contains|expand: '%HomeTenantID%'
condition: selection and not 1 of filter_main_*

False positives (as the rule lists them)

  • Unlikely

Tags

  • attack.privilege-escalation
  • attack.persistence
  • attack.initial-access
  • attack.stealth
  • attack.t1078.004

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-placeholder/cloud/azure/signin_logs/azure_users_authenticating_to_other_azure_ad_tenants.yml

Sources and licences

  • SigmaHQ

    "Users Authenticating To Other Azure AD Tenants" by MikeDuddington, '@dudders1' (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-placeholder/cloud/azure/signin_logs/azure_users_authenticating_to_other_azure_ad_tenants.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Users Authenticating To Other Azure AD Tenants",
entity page, dataset version ref-c161351750a2, updated 2026-05-08T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/5f521e4b-0105-4b72-845b-2198a54487b9 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 5f521e4b-0105-4b72-845b-2198a54487b9, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.