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Sentinel Queries
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What is BARK Detection?
These detection queries help identify suspicious activities in Azure AD that could indicate privilege escalation attempts, similar to what the BARK toolkit can perform. They monitor for actions like password resets, credential additions, role assignments and other sensitive operations.How to Use These Detections?
The queries should be run in Microsoft Sentinel or Log Analytics against your Azure AD logs. It's recommended to first test them in your environment to tune for accuracy.When to Use These Detections?
Use these queries for continuous monitoring of your Azure AD environment, especially if you have privileged users/service principals or want to detect potential compromise.Key Detection Capabilities
Password Reset DetectionIdentifies password reset operations performed via PowerShell which could indicate compromise.
Application Secret CreationDetects when new credentials are added to application objects.
Role Assignment MonitoringTracks when users or service principals are added to privileged roles.
Ownership ChangesMonitors for changes to owners of applications and service principals.
Strengths and Limitations
Strengths
Provides visibility into potential privilege escalation paths
Covers both user and service principal activities
Uses native Azure AD logs requiring no additional instrumentation
Helps detect abuse of legitimate tools and permissions
Limitations
May generate false positives in environments with legitimate automation
Requires tuning to match your specific environment
Only detects actions after they occur (not preventive)
Some legitimate admin activities may appear similar to malicious ones
Implementation Guide
Set up loggingEnsure Azure AD logs are being collected in your Log Analytics workspace.
Test queriesRun the detection queries against your environment to establish baselines.
Create alertsConfigure alerts for suspicious activities in Microsoft Sentinel.
Implement controlsApply the recommended prevention controls from the documentation.
Detection Scenarios
Detecting Application Secret CreationMonitoring when new credentials are added to applications, which could allow attackers to persist in the environment.
Identifying Suspicious Role AssignmentsDetecting when service principals are added to privileged roles, which could indicate privilege escalation.
Frequently Asked Questions
1
Are these queries specific to the BARK toolkit?No, they detect behaviors that BARK can perform but could also be done with other tools. The queries focus on the underlying actions rather than specific tools.
2
How often should I run these detection queries?Ideally these should be run continuously as alerts in Microsoft Sentinel. At minimum, run them daily as part of your security monitoring.
3
What permissions do I need to use these detections?You need read access to Azure AD audit logs and sign-in logs, typically through the Security Reader or similar role.
4
How can I reduce false positives?Tune the queries by first running them in your environment to identify legitimate activities, then add exclusions for known-good patterns.
Additional Resources
BloodHound BARK GitHubThe official BARK toolkit repository
Azure AD Privilege Escalation DetectionBlog post on detecting Azure AD privilege escalation
Microsoft Azure AD DocumentationOfficial Microsoft documentation for Azure Active Directory
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