Active Directory (AD) continues to be one of the most targeted components in enterprise environments. Whether it’s credential theft, lateral movement, or exploitation of legacy protocols, attackers frequently focus on identity infrastructure. Microsoft Defender for Identity (MDI) helps counter this by providing real-time identity threat detection and analytics purpose-built for AD environments.
This article walks through how to use MDI to strengthen AD security, from preparation through deployment and monitoring. You’ll also learn how Ravenswood Technology Group helps clients implement MDI as part of a broader identity and access management strategy grounded in Zero Trust principles.
What Is Microsoft Defender for Identity?
MDI is a cloud-based identity threat detection solution developed to secure on-premises AD environments. As part of the Microsoft 365 Defender suite, MDI uses user and entity behavior analytics (UEBA) and machine learning to detect suspicious activity and identity-based attacks.
For organizations operating in hybrid environments—on-premises AD plus Microsoft Entra ID—MDI offers a valuable layer of visibility that bridges both identity systems.
Key Features for AD and Hybrid Identity Environments
- Real -time detection of attacks such as Pass-the-Hash, Golden Ticket, and credential theft
- Lateral movement path analysis to highlight exposed privileged accounts
- Identification of sensitive or misconfigured accounts
- Visibility into hybrid identity activity (on-prem + Microsoft Entra ID)
- Detection of legacy protocol usage such as NTLM and SMBv1
- Integration with Microsoft Sentinel and Microsoft 365 Defender for end-to-end incident response
- Continuous behavioral monitoring to surface unusual login activity and admin behavior
These features enable organizations to detect, investigate, and respond to threats across the full identity landscape.
Step 1: Prepare Your Active Directory Environment and Prerequisites
Before installing MDI, it’s critical to validate that your environment meets all technical and operational prerequisites.
Confirm Technical Readiness
- Ensure your domain controllers are running supported operating systems
- Validate event logging is enabled for required event IDs (e.g., 4624, 4769, 4662)
- Check network connectivity and port availability for sensor communication
- Confirm your organization has the correct Microsoft 365 licensing in place
- Assign the necessary role permissions for Defender for Identity administration
Step 2: Deploy and Configure Microsoft Defender for Identity Sensors
With the environment prepared, the next step is to install MDI sensors and configure the platform for real-time monitoring.
Installing MDI Sensors
Sensors should be installed on each domain controller within the environment. In some cases, standalone sensors may be used where direct installation isn’t possible.
During setup:
- Configure appropriate service accounts
- Ensure connectivity to the Microsoft Defender service
- Validate that the sensor can access required event logs and network traffic
Follow Microsoft deployment best practices to ensure proper data collection and secure configuration.
You can also configure alert tuning, notifications, and role-based access controls for MDI administration.
Step 3: Monitor, Analyze, and Respond to Identity-Based Threats
Partner with Microsoft experts you can trust
If it’s time to take that first step toward leveling up your organization’s security, get in touch with Ravenswood to start the conversation.
With MDI fully deployed, security teams gain powerful tools to monitor identity activity and respond to emerging threats.
Leverage the Defender for Identity Dashboard
Within the Microsoft Defender portal, teams can:
- Monitor active identity incidents and alert timelines
- Review security recommendations and detection summaries
- Investigate suspicious behavior, including admin role abuse, credential theft attempts, and legacy authentication usage
- Detect unmanaged devices and excessive permissions within the identity workspace
These insights allow teams to take targeted actions to contain threats and reduce exposure.
Strengthen Identity Posture
Respond to alerts by implementing identity recommended actions across your environment:
- Enforce multi-factor authentication and conditional access for privileged users
- Segment administrative roles using a tiered model
- Eliminate insecure protocols and deprecated authentication methods
- Apply hardening measures to endpoints, domain controllers, and Entra ID configurations
MDI also supports proactive identity protection through continuous behavioral analytics and hygiene assessments.
How Ravenswood Technology Group Can Help
Ravenswood Technology Group specializes in Microsoft identity and security solutions. Our consultants work closely with clients to implement and optimize Defender for Identity in complex enterprise environments.
Expert Deployment and Configuration
We help organizations:
- Install MDI sensors on domain controllers or configure standalone sensors
- Tune alert thresholds to reduce noise and increase detection fidelity
- Integrate MDI with Microsoft Sentinel for unified visibility
- Enable advanced detections and ensure secure, compliant configurations
Strategic Identity Security Guidance
Ravenswood supports clients with:
- AD hardening aligned with Microsoft Secure Score and Zero Trust principles
- Hybrid identity strategies using Microsoft Entra ID, Microsoft Entra Connect, and Microsoft Entra ID Protection
- Identity governance and privileged access solutions, including Privileged Access Workstations (PAWs)
- Ongoing assessments to monitor and improve identity security posture
Complimentary Identity Security Assessment
To help organizations evaluate their readiness, Ravenswood offers a free identity security assessment. This includes a review of your current configuration, identity risks, and Defender for Identity implementation roadmap.
Take the Next Step Toward Identity Protection
AD continues to be a top target for threat actors. MDI helps security teams detect identity-based threats and respond in real time to compromise attempts.
By preparing your environment, deploying sensors correctly, and integrating with Microsoft’s security tool portfolio, you can strengthen your organization’s identity protection strategy and move toward a Zero Trust architecture.
Security is a continuous process. Review your AD configurations, audit admin workflows, and stay current with threat detection capabilities. For expert support, Ravenswood can help you implement, optimize, and maintain a strong identity security posture.
