detecting-azure-service-principal-abuse

name	detecting-azure-service-principal-abuse
description	Detect Azure service principal abuse in Microsoft Entra ID using KQL detection queries (Sentinel/Splunk) against Azure AD Audit and Sign-in Logs, covering added credentials, privileged role assignment, admin consent bypass, and service principal enumeration. Use when investigating suspected privilege escalation or persistence via service principals, or building threat-hunting queries for Entra ID identity abuse.
domain	cybersecurity
subdomain	cloud-security
tags	["azure","entra-id","service-principal","privilege-escalation","credential-abuse","detection","splunk","sentinel"]
version	1.0
author	mahipal
license	Apache-2.0
d3fend_techniques	["Token Binding","Restore Access","Application Protocol Command Analysis","Reissue Credential","Network Isolation"]
nist_csf	["PR.IR-01","ID.AM-08","GV.SC-06","DE.CM-01"]
mitre_attack	["T1078.004","T1098.001","T1528","T1550.001","T1098.003"]

Detecting Azure Service Principal Abuse

Overview

Azure service principals are identity objects used by applications, services, and automation tools to access Azure resources. Attackers exploit service principals for privilege escalation, lateral movement, and persistent access. Key abuse patterns include: adding credentials to existing principals, assigning privileged roles, bypassing admin consent, and enumerating service principals for attack paths. Application ownership grants the ability to manage credentials and configure permissions, creating hidden privilege escalation paths.

When to Use

• When investigating security incidents that require detecting azure service principal abuse
• When building detection rules or threat hunting queries for this domain
• When SOC analysts need structured procedures for this analysis type
• When validating security monitoring coverage for related attack techniques

Prerequisites

• Azure subscription with Microsoft Entra ID P2 license
• Access to Azure AD Audit Logs and Sign-in Logs
• Microsoft Sentinel or Splunk for SIEM-based detection
• Microsoft Graph API permissions for investigation
• Global Reader or Security Reader role minimum

Key Abuse Patterns

1. New Credentials Added to Service Principal

Attackers add new client secrets or certificates to gain persistent access:

Detection Query (KQL - Sentinel):

AuditLogs
| where OperationName has "Add service principal credentials"
    or OperationName has "Update application - Certificates and secrets management"
| extend InitiatedBy = tostring(InitiatedBy.user.userPrincipalName)
| extend TargetSP = tostring(TargetResources[0].displayName)
| extend TargetSPId = tostring(TargetResources[0].id)
| project TimeGenerated, InitiatedBy, OperationName, TargetSP, TargetSPId
| sort by TimeGenerated desc

Detection Query (SPL - Splunk):

index=azure sourcetype="azure:aad:audit"
operationName="Add service principal credentials"
    OR operationName="Update application*Certificates and secrets*"
| stats count by initiatedBy.user.userPrincipalName, targetResources{}.displayName, _time
| sort -_time

2. Privileged Role Assignment to Service Principal

AuditLogs
| where OperationName == "Add member to role"
| extend RoleName = tostring(TargetResources[0].modifiedProperties[1].newValue)
| where RoleName has_any ("Global Administrator", "Application Administrator",
    "Privileged Role Administrator", "Cloud Application Administrator")
| extend TargetSP = tostring(TargetResources[0].displayName)
| extend InitiatedBy = tostring(InitiatedBy.user.userPrincipalName)
| project TimeGenerated, InitiatedBy, TargetSP, RoleName, OperationName