Security Operations Center (SOC) Transition and Managed Detection and Response (MDR) Case Study

Executive Summary

A leading stock broking organization engaged our Managed Security Services team to assess its existing SIEM and outsourced SOC. Our evaluation exposed hidden threats and significant monitoring gaps. Following the transition to our managed detection and response (MDR) service, the client gained enhanced threat visibility and improved detection capabilities through refined detection engineering. This enabled faster threat detection, more effective incident response, and a stronger overall security posture.

Client Context & Initial Engagement

The client, a regulated stock broking organization, relied on an outsourced security operations center (SOC) managed by a Managed Security Service Provider (MSSP) to meet its security monitoring and compliance requirements. While the service appeared adequate on paper, our advisory engagement identified several concerns, including poor alert context, limited visibility into cloud and identity environments, outdated detection rules, absence of threat intelligence integration, and a lack of measurable service level agreement (SLA) performance. We recommended a structured four-week SOC evaluation to objectively assess the provider’s detection capabilities, operational maturity, and overall effectiveness. The client approved the assessment to identify gaps and establish a roadmap for improving its security operations.

Evaluation Methodology

Our evaluation was conducted using a hybrid framework based on NIST CSF, the SOC Capability Maturity Model (SOC-CMM), and MITRE ATT&CK. Over a four-week engagement, we assessed the client’s security operations across four key areas:

• Log Source Assessment: Reviewed SIEM data sources to identify telemetry gaps, ingestion issues, and coverage across in-scope assets
• Detection Assessment: Assessed detection rules, use cases, and alignment with MITRE ATT&CK to measure visibility across the attack lifecycle
• Alert & Incident Review: Analyzed historical alerts, investigations, analyst workflows, and operational metrics to assess detection and response effectiveness
• Governance Review: Assessed SOC processes, SLA reporting, playbooks, threat intelligence integration, and operational maturity

Findings were validated with the client’s security leadership before the final assessment report was delivered.

Assessment Findings

The evaluation identified multiple gaps across visibility, detection, and operational processes.

Key observations included:

• Limited visibility across cloud and identity infrastructure, reducing monitoring coverage
• Detection content not evolved with changes in the environment or emerging threats
• Inconsistent alignment of detection rules with the MITRE ATT&CK framework
• Limited integration of threat intelligence into detection workflows
• Analyst investigations requiring improved contextual enrichment and standardized reporting
• Operational metrics and SLA reporting that provided limited insight into SOC performance

During onboarding, our threat hunting activities also identified suspicious services, unauthorized system activity, and potentially malicious browser extensions that had not previously been investigated, reinforcing the need for broader visibility and continuous detection engineering.

Solution Delivered

Following acceptance of the assessment findings, the client transitioned to our SOC as a Service through a phased migration completed within 30 days without interrupting security monitoring.

The engagement included:

1. Detection Engineering

A MITRE ATT&CK-aligned detection library containing more than 120 detection rules was deployed, alongside custom detection use cases developed specifically for the client’s stock broking environment. Continuous tuning, proactive threat hunting, and regular detection updates ensured the monitoring capability remained aligned with the evolving threat landscape.

2. 24×7 Security Monitoring

A dedicated SOC operating model was established with tiered analysts supporting continuous monitoring, investigation, and incident response. Alerts were prioritized according to business risk and enriched with investigative evidence, attack context, and recommended remediation before escalation.

3. Threat Intelligence

Threat intelligence feeds were integrated directly into the SIEM, enabling automated correlation of indicators of compromise (IOCs) against client telemetry. Intelligence-driven detection updates improved visibility into emerging threats targeting the financial sector.

4. Incident Response

Client-specific incident response playbooks were developed for high-priority scenarios, including ransomware, credential compromise, unauthorized services, malicious browser activity, and privilege escalation. Escalation workflows were aligned with business-critical systems, while tabletop exercises validated operational readiness.

5. Compliance & Reporting

A live SOC dashboard provided real-time operational visibility, including incident status, SLA performance, MTTD, MTTR, and detection coverage. Automated reporting and evidence generation simplified audit preparation and regulatory compliance.

Measurable Outcomes

Within 90 days of transition, the client achieved measurable improvements across security operations.

Key Lessons

This engagement reinforced several principles applicable to SOC transformation initiatives.

• Effective security monitoring requires comprehensive telemetry across cloud, identity, endpoint, and business-critical systems.
• Detection engineering must evolve continuously to address changes in infrastructure and emerging attacker techniques.
• Mapping detection use cases to the MITRE ATT&CK provides an objective method for measuring coverage and identifying improvement opportunities.
• Threat intelligence and proactive threat hunting significantly enhance an organization’s ability to detect threats that traditional monitoring may overlook.
• Well-planned SOC transitions can improve security capabilities without disrupting ongoing monitoring or compliance obligations.

The engagement demonstrates that an effective SOC extends beyond SIEM deployment. Success depends on mature detection engineering, continuous visibility improvement, skilled analysts, and intelligence-led operations working together to provide meaningful threat detection and response.

Conclusion

This engagement demonstrates that effective security operations require more than deploying an SIEM or outsourcing SOC monitoring. Through a structured assessment and seamless transition to our Managed Detection and Response (MDR) service, the client achieved improved visibility, stronger detection capabilities, and a more mature security operations function while maintaining continuous monitoring throughout the migration.