[Rule Deprecation] Azure Entra Sign-in Brute Force Microsoft 365 Accounts by Repeat Source (#4780)

* rule deprecation

* adjusted investigation guide

Author: terrancedejesus

rules/integrations/azure/credential_access_entra_signin_brute_force_microsoft_365_repeat_source.toml

@@ -2,7 +2,7 @@
 creation_date = "2024/09/06"
 integration = ["azure"]
 maturity = "production"
-updated_date = "2025/03/20"
+updated_date = "2025/06/06"
 
 [rule]
 author = ["Elastic"]
@@ -22,13 +22,13 @@ from = "now-30m"
 interval = "10m"
 language = "esql"
 license = "Elastic License v2"
-name = "Azure Entra Sign-in Brute Force Microsoft 365 Accounts by Repeat Source"
+name = "Deprecated - Azure Entra Sign-in Brute Force Microsoft 365 Accounts by Repeat Source"
 note = """## Triage and analysis
 
 > **Disclaimer**:
 > This investigation guide was created using generative AI technology and has been reviewed to improve its accuracy and relevance. While every effort has been made to ensure its quality, we recommend validating the content and adapting it to suit your specific environment and operational needs.
 
-### Investigating Azure Entra Sign-in Brute Force Microsoft 365 Accounts by Repeat Source
+### Investigating Deprecated - Azure Entra Sign-in Brute Force Microsoft 365 Accounts by Repeat Source
 
 Azure Entra ID, integral to Microsoft 365, manages identity and access, ensuring secure authentication. Adversaries exploit this by attempting numerous failed logins to breach accounts. The detection rule identifies such brute-force attempts by monitoring failed logins from a single IP within a short timeframe, flagging potential unauthorized access efforts.