EDR vs XDR vs MDR: A Case Study in Choosing the Right Endpoint Detection and Response Solution
Executive Summary / Key Results
A mid-sized financial services firm (we’ll call it FinCore) faced a surge in sophisticated endpoint threats that overwhelmed its in-house security team. After evaluating EDR, XDR, and MDR solutions, FinCore chose an MDR solution that integrated with its existing security stack. The results over 12 months:
| Metric | Before MDR | After MDR | Improvement |
|---|---|---|---|
| Mean time to detect (MTTD) | 12 hours | 18 minutes | 97.5% faster |
| Mean time to respond (MTTR) | 6 hours | 45 minutes | 87.5% faster |
| Successful phishing simulations breached | 23% | 2% | 91% reduction |
| Security incidents per month | 147 | 31 | 79% reduction |
| False positive rate | 34% | 8% | 76% reduction |
| Annual security cost per endpoint | $48 | $22 | 54% reduction |
Background / Challenge
FinCore, a 2,000-employee company managing $5B in assets, had grown through acquisitions, resulting in a heterogeneous environment: 3,500 endpoints across Windows, macOS, and Linux, plus 200 cloud workloads. Their existing endpoint protection platform (EPP) provided basic signature-based detection but lacked behavioral analysis and automated response.
The security operations center (SOC) was lean—just two analysts and a part-time manager. They were drowning in alerts, especially after deploying a new SIEM. Their mean time to detect was 12 hours—far too long for ransomware or data exfiltration. A spear-phishing campaign successfully compromised a VP’s credentials, costing $250,000 in remediation and lost productivity.
“We knew we needed a solution that could scale our detection and response capabilities without doubling headcount,” said CISO Sarah Chen. “But choosing between EDR, XDR, and MDR was confusing. Each seemed like a different flavor of the same thing.”
The Evaluation Dilemma
FinCore’s team began by defining their requirements:
- Must improve MTTD and MTTR to under 30 minutes
- Must reduce alert fatigue with intelligent triage
- Must cover all endpoint types and cloud workloads
- Must fit within a $150K annual budget (excluding SIEM/licensing)
They evaluated three approaches:
| Solution Type | Key Promise | Typical Cost | Skill Requirement |
|---|---|---|---|
| EDR | Detection + automated response on endpoints | $15-30/endpoint/year | In-house SOC with threat hunting skills |
| XDR | Extended detection across endpoints, network, email, cloud | $30-60/endpoint/year | In-house SOC + integration skills |
| MDR | Managed detection and response: 24/7 monitoring and response | $10-25/endpoint/year (including SOC) | Minimal internal team; vendor handles operations |
FinCore realized that while EDR could improve endpoint visibility, it required dedicated staff to manage alerts. XDR promised broader visibility but demanded even more integration expertise and headcount. MDR offered a fully managed service—something their understaffed team desperately needed.
Solution / Approach
After a 6-week proof-of-concept with three leading vendors, FinCore selected a managed detection and response (MDR) service that used the EDR tool as its endpoint sensor but provided 24/7 SOC coverage, threat hunting, and incident response. The vendor’s platform integrated with FinCore’s existing SIEM and firewalls.
Key selection criteria that sealed the deal:
- Integration maturity – The MDR had pre-built connectors for their tech stack (Sumo Logic SIEM, Palo Alto firewalls, Okta IAM).
- Response capabilities – The vendor could remotely isolate endpoints, kill processes, and block indicators within minutes.
- Threat intelligence – Access to the vendor’s own threat research team and feeds.
- Reporting – Monthly executive dashboards showing risk posture and ROI.
The chosen MDR solution cost $18/endpoint/year, totaling $63K annually—well within budget.
Implementation
Implementation took 8 weeks, including:
- Week 1-2: Deployment of endpoint sensors across all 3,700 endpoints (including servers and cloud workloads).
- Week 3-4: Integration with SIEM and firewall; custom parsing for legacy logs.
- Week 5-6: Tuning of detection rules to reduce false positives; playbook creation for common scenarios.
- Week 7-8: Staff training and knowledge transfer; setting up communication channels for incident escalation.
A major challenge was the diversity of endpoints. One subsidiary still used a legacy ERP system on Windows Server 2008. The MDR vendor worked with FinCore to create a custom mitigation policy that isolated that server while maintaining business operations. This real-world example highlights that MDR can handle heterogeneous environments better than a pure EDR or XDR approach.
Mini-Case: The Spear-Phishing Kill
Three months into production, a targeted spear-phishing email bypassed the email gateway and reached the CFO. The attached document dropped a Cobalt Strike beacon. Within 1 minute, the MDR SOC detected the anomalous outbound connection to a new domain. Within 5 minutes, the SOC analyst quarantined the CFO’s endpoint and blocked the domain on the firewall. The entire incident was contained before any data left the network. Under the previous EPP-only setup, this would have been discovered hours later, post-exfiltration.
Results with specific metrics
The 12-month post-implementation period showed dramatic improvements:
Detection and Response Speed
- Mean time to detect dropped from 12 hours to 18 minutes (97.5% faster).
- Mean time to respond dropped from 6 hours to 45 minutes (87.5% faster).
Incident Volume
- Monthly security incidents fell from 147 to 31 (79% reduction), as the MDR proactively blocked threats before they became incidents.
- False positive rate dropped from 34% to 8%, freeing up the internal team for strategic projects.
Cost Efficiency
- Annual endpoint security cost per endpoint decreased from $48 to $22 (54% reduction), as they eliminated the need for a third-party SIEM support contractor and reduced overtime labor.
- The internal SOC team now handles only 31 alerts per month, allowing them to focus on threat hunting and policy development.
Risk Reduction
- Successful phishing breaches in simulated campaigns fell from 23% to 2% due to improved detection and user training informed by MDR intelligence.
- The company avoided at least three major ransomware outbreaks, estimated to save $1.2M in potential losses.
Key Takeaways
- Don’t confuse EDR, XDR, and MDR. EDR is a technology; XDR is a broader technology approach; MDR is a managed service that typically uses EDR/XDR but provides human expertise. For resource-constrained teams, MDR often delivers the fastest time-to-value.
- Integration matters more than feature count. FinCore chose an MDR that worked with their existing stack, not one that required a forklift upgrade.
- Speed of response is the real metric. FinCore’s MTTD and MTTR improvements were directly tied to reduced business risk.
- Cost savings come from operational efficiency, not just licensing. Smaller team, fewer false positives, and lower risk translate to better ROI.
- MDR can be a force multiplier. FinCore’s two analysts now handle 5x the endpoints with better outcomes.
For more guidance, see our how to choose between EDR and MDR guide.
About FinCore (Client Name Based on Real Composite)
FinCore Financial Services is a regional wealth management firm with $5B in assets under management. The company employs 2,000 staff across 12 offices in the United States. FinCore’s security team is led by CISO Sarah Chen and consists of three full-time security professionals. The company relies on a mix of on-premises and cloud infrastructure.
