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[Rule Tuning] Entra ID User Sign-in with Unusual Registered Device #5466

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[Rule Tuning] Entra ID User Sign-in with Unusual Registered Device #5466

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[Rule Tuning] Entra ID User Sign-in with Unusual Registered Device
terrancedejesus Dec 15, 2025
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Merge branch 'main' into terrancedejesus/issue5465
terrancedejesus Dec 17, 2025
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Merge branch 'main' into terrancedejesus/issue5465
terrancedejesus Dec 18, 2025
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terrancedejesus Dec 18, 2025
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Merge branch 'main' into terrancedejesus/issue5465
terrancedejesus Dec 18, 2025
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11 changes: 6 additions & 5 deletions rules/integrations/azure/persistence_entra_id_user_signed_in_from_unusual_device.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -2,12 +2,12 @@
creation_date = "2025/06/16"
integration = ["azure"]
maturity = "production"
updated_date = "2025/12/10"
updated_date = "2025/12/15"

[rule]
author = ["Elastic"]
description = """
Identifies when a Microsoft Entra ID user signs in from a device that is not typically used by the user, which may
Identifies when a Microsoft Entra ID user signs in from a device that is not typically used by the user and is not managed, which may
indicate potential compromise or unauthorized access attempts. This rule detects unusual sign-in activity by comparing
the device used for the sign-in against the user's typical device usage patterns. Adversaries may create and register a
new device to obtain a Primary Refresh Token (PRT) and maintain persistent access.
Expand All @@ -16,10 +16,10 @@ from = "now-9m"
index = ["filebeat-*", "logs-azure.signinlogs-*"]
language = "kuery"
license = "Elastic License v2"
name = "Entra ID User Sign-in with Unusual Registered Device"
name = "Entra ID User Sign-in with Unusual Non-Managed Device"
note = """## Triage and analysis

### Investigating Entra ID User Sign-in with Unusual Registered Device
### Investigating Entra ID User Sign-in with Unusual Non-Managed Device

This rule detects when a Microsoft Entra ID user signs in from a device that is not typically used by the user, which may indicate potential compromise or unauthorized access attempts. This rule detects unusual sign-in activity by comparing the device used for the sign-in against the user's typical device usage patterns. Adversaries may create and register a new device to obtain a Primary Refresh Token (PRT) and maintain persistent access.

Expand Down Expand Up @@ -71,6 +71,7 @@ event.dataset: "azure.signinlogs" and
event.category: "authentication" and
azure.signinlogs.properties.user_type: "Member" and
azure.signinlogs.properties.token_protection_status_details.sign_in_session_status: "unbound" and
not azure.signinlogs.properties.device_detail.is_managed: true and
not azure.signinlogs.properties.device_detail.device_id: "" and
azure.signinlogs.properties.user_principal_name: *
'''
Expand Down Expand Up @@ -133,6 +134,6 @@ value = [
]
[[rule.new_terms.history_window_start]]
field = "history_window_start"
value = "now-7d"
value = "now-14d"
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@imays11 imays11 Dec 18, 2025

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I would just keep an eye on the performance for these larger windows - #5476



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