Detecting Azure Service Principal Abuse

---
name: detecting-azure-service-principal-abuse
description: Use when detect and investigate Azure service principal abuse including
  privilege escalation, credential compromise, admin consent bypass, and unauthorized
  enumeration in Microsoft Entra ID environments. Use when detecting and investigate
  azure service principal abuse including privilege escalation,.
domain: cybersecurity
subdomain: cloud-security
tags:
- azure
- entra-id
- service-principal
- privilege-escalation
- credential-abuse
- detection
- splunk
- sentinel
version: '1.0'
author: oyi77
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
category: cybersecurity
---


# 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
**Trigger phrases:**
- "detecting azure service principal abuse"
- "Detect and investigate Azure service principal abuse including privilege escalat"


- 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

- **Follow the principle of least privilege** — use the minimum permissions needed for each task
- **Document everything** — maintain logs of all actions, configurations, and findings
- **Verify before acting** — confirm assumptions about the environment before making changes
- **Automate repetitive steps** — script common workflows to reduce human error
### 1. New Credentials Added to Service Principal

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

**Detection Query (KQL - Sentinel):**
```kql
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):**
```spl
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

```kql
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
```

### 3. Service Principal Enumeration Detection

```kql
MicrosoftGraphActivityLogs
| where RequestMethod == "GET"
| where RequestUri has "/servicePrincipals"
| summarize RequestCount = count() by UserAgent, IPAddress, bin(TimeGenerated, 1h)
| where RequestCount > 10
| sort by RequestCount desc
```

### 4. Admin Consent Bypass

```kql
AuditLogs
| where OperationName == "Consent to application"
| extend ConsentType = tostring(TargetResources[0].modifiedProperties[4].newValue)
| where ConsentType has "AllPrincipals"
| extend AppName = tostring(TargetResources[0].displayName)
| extend InitiatedBy = tostring(InitiatedBy.user.userPrincipalName)
| project TimeGenerated, InitiatedBy, AppName, ConsentType
```

### 5. OAuth App Permissions Escalation

```kql
AuditLogs
| where OperationName == "Add app role assignment to service principal"
| extend AppRoleValue = tostring(TargetResources[0].modifiedProperties[1].newValue)
| where AppRoleValue has_any ("RoleManagement.ReadWrite.Directory",
    "Application.ReadWrite.All", "AppRoleAssignment.ReadWrite.All",
    "Directory.ReadWrite.All", "Mail.ReadWrite")
| extend TargetApp = tostring(TargetResources[0].displayName)
| project TimeGenerated, TargetApp, AppRoleValue, CorrelationId
```

## Investigation Procedures

This section covers investigation procedures for detecting azure service principal abuse.

- Ensure all prerequisites are met before proceeding
- Follow the documented workflow steps in sequence
- Record results and any anomalies encountered during this phase
### Step 1: Identify compromised service principal

```powershell
# List service principals with recently added credentials
Connect-MgGraph -Scopes "Application.Read.All"

$suspiciousSPs = Get-MgServicePrincipal -All | ForEach-Object {
    $sp = $_
    $creds = Get-MgServicePrincipalPasswordCredential -ServicePrincipalId $sp.Id
    $recentCreds = $creds | Where-Object { $_.StartDateTime -gt (Get-Date).AddDays(-7) }
    if ($recentCreds) {
        [PSCustomObject]@{
            DisplayName = $sp.DisplayName
            AppId = $sp.AppId
            ObjectId = $sp.Id
            NewCredsCount = $recentCreds.Count
            LatestCredAdded = ($recentCreds | Sort-Object StartDateTime -Descending | Select-Object -First 1).StartDateTime
        }
    }
}
$suspiciousSPs | Sort-Object LatestCredAdded -Descending
```

### Step 2: Review service principal role assignments

```powershell
# Check role assignments for a specific service principal
$spId = "<service-principal-object-id>"
Get-MgServicePrincipalAppRoleAssignment -ServicePrincipalId $spId | ForEach-Object {
    $resource = Get-MgServicePrincipal -ServicePrincipalId $_.ResourceId
    [PSCustomObject]@{
        AppRoleId = $_.AppRoleId
        ResourceDisplayName = $resource.DisplayName
        CreatedDateTime = $_.CreatedDateTime
    }
}
```

### Step 3: Check application ownership

```powershell
# List owners of all applications (ownership = credential control)
Get-MgApplication -All | ForEach-Object {
    $app = $_
    $owners = Get-MgApplicationOwner -ApplicationId $app.Id
    foreach ($owner in $owners) {
        [PSCustomObject]@{
            AppName = $app.DisplayName
            AppId = $app.AppId
            OwnerUPN = $owner.AdditionalProperties.userPrincipalName
            OwnerType = $owner.AdditionalProperties.'@odata.type'
        }
    }
} | Where-Object { $_.OwnerUPN -ne $null }
```

### Step 4: Review sign-in activity

```kql
AADServicePrincipalSignInLogs
| where ServicePrincipalId == "<target-sp-id>"
| project TimeGenerated, ServicePrincipalName, IPAddress, Location,
    ResourceDisplayName, Status.errorCode
| sort by TimeGenerated desc
```

## Preventive Controls

This section covers preventive controls for detecting azure service principal abuse.

- Ensure all prerequisites are met before proceeding
- Follow the documented workflow steps in sequence
- Record results and any anomalies encountered during this phase
### Restrict application registration

```powershell
# Disable user ability to register applications
Update-MgPolicyAuthorizationPolicy -DefaultUserRolePermissions @{
    AllowedToCreateApps = $false
}
```

### Configure app consent policies

```powershell
# Require admin approval for all app consent requests
New-MgPolicyPermissionGrantPolicy -Id "admin-only-consent" `
    -DisplayName "Admin Only Consent" `
    -Description "Only admins can consent to applications"
```

### Monitor with Microsoft Sentinel Analytics Rules

Create analytics rules for:
- New service principal credential additions
- Privileged role assignments to service principals
- Bulk service principal enumeration
- Admin consent grants to unknown applications
- Service principal sign-ins from unusual locations

## MITRE ATT&CK Mapping

| Technique | ID | Description |
|-----------|-----|-------------|
| Account Manipulation: Additional Cloud Credentials | T1098.001 | Adding credentials to service principal |
| Valid Accounts: Cloud Accounts | T1078.004 | Using compromised service principal |
| Account Discovery: Cloud Account | T1087.004 | Enumerating service principals |
| Steal Application Access Token | T1528 | OAuth token theft via service principal |

## When NOT to Use

- You need to perform the attack to test detection (use performing-* skills)
- Task is about analyzing past incidents (use analyzing-* skills)
- You need to implement detection rules (use implementing-* skills)
- Task is about threat hunting proactively (use hunting-* skills)
- You don't have access to logs or monitoring data
- Task requires incident response (use IR skills)


## Red Flags

- Performing actions without explicit written authorization from the asset owner
- Testing against production systems without a defined scope and rules of engagement
- Modifying cloud IAM policies or security groups without approval
- Exposing cloud credentials or secrets in logs or reports
- Running scans that generate excessive API calls and trigger billing alerts

## Verification

- All steps executed successfully against a test environment before production use
- Output documented with screenshots or logs demonstrating expected behavior
- Cloud resource changes reverted or documented as intentional
- IAM policies reviewed for least-privilege compliance after testing
- No residual test resources left running (cost and security check)

## References

- Splunk Detection: Azure AD Service Principal Abuse
- Semperis: Service Principal Ownership Abuse in Entra ID
- MITRE ATT&CK Cloud Matrix
- Microsoft: Securing service principals in Entra ID

## Process

1. Analyze the task requirements
2. Apply domain expertise
3. Verify output quality

## Anti-Rationalization Table

| Rationalization | Reality |
|---|---|
| "We are too small to be targeted" | Automated attacks target everyone. Size does not matter. |
| "Security slows us down" | A breach slows you down 100x more. Build security in from the start. |
| "We will fix it after launch" | Vulnerabilities in production are exploited within hours. Fix before deploy. |