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   – Greg Sopcak | Southern Michigan Bank & Trust
It takes dedicated experience to use technology strategically in your industry. That’s why we specialize in certain verticals while offering comprehensive technology services.
SIEM is a technology for collecting and analyzing cybersecurity data, while MDR and XDR offer overlapping but differing approaches to threat detection and response.
So which solution—or solutions—does your organization need?
Here’s how these solutions compare and how to choose the right mix for your business.
Key takeaways:
MDR is a service model for cybersecurity threat detection and response, while XDR is an extended technology for detection and response.
SIEM is a technology that ingests, normalizes, and stores data related to cybersecurity logs and incidents. It can be managed in-house or by a service provider.
Most organizations need a SIEM solution and some form of detection and response, whether managed in-house or through an MSSP (managed security service provider).
What is MDR in cybersecurity?
MDR (managed detection and response) is a managed cybersecurity service that provides 24/7/365 threat monitoring, detection, investigation, and active response to security incidents across an organization’s environment. MDR combines the capabilities of software such as EDR (endpoint detection and response) or XDR (extended detection and response) with management by cybersecurity experts.
What is XDR in cybersecurity?
XDR (extended detection and response) is cybersecurity software that unifies threat detection, investigation, and response across multiple security layers—such as endpoints, email, identity, cloud workloads, and networks—into a single system. XDR correlates security data from across the environment to detect attacks earlier and respond faster than isolated tools can.
What is SIEM in cybersecurity?
SIEM (security information and event management) is cybersecurity software that collects, normalizes, stores, and analyzes security logs and event data from across an organization’s IT environment to support threat detection, investigation, and compliance reporting. SIEM serves as the system of record for all cybersecurity data and analysis related to an organization’s environment.
MDR vs XDR vs SIEM comparison table
MDR, XDR, and SIEM address different layers of modern security operations, with some overlap between MDR and XDR. SIEM and XDR are technologies, while MDR is a service model. SIEM serves as the source of truth for cybersecurity data. MDR and XDR cover monitoring and threat detection, with MDR providing technology and service, while XDR offers technology without the service layer.
Here’s how the three solutions compare in detail.
Capability
MDR (Managed Service)
XDR (Platform)
SIEM (Platform)
What it is
Outsourced detection and response services
Unified detection and response technology
Centralized log and analytics system
Primary focus
People + process + response
Cross-domain threat detection and response
Visibility, correlation, compliance
Data sources
Depends on tools used
Curated security telemetry
Very broad (logs from almost anything)
Human involvement
Included in the service (24/7 analysts)
Managed by customer or third-party provider
Managed by customer or third-party provider
Response actions
Active, provider-led
Automated or guided
Mostly manual
Compliance reporting
Varies by managed service provider
Limited
Strong
Typical buyer
IT leaders lacking full, in-house SOC
Security leaders with in-house cyber teams wanting faster detection
Internal or outsourced cyber teams needing deep visibility and audits
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Do businesses need a SIEM solution as well as MDR or XDR?
Whether managed in-house or outsourced, every midmarket or enterprise business should have a SIEM solution and some form of detection and response. The right mix of software and services will depend on whether the organization has an in-house cybersecurity team, and if so, what capabilities and bandwidth that team has.
Where each approach makes sense
In-house SIEM + XDR
You need full internal control of security operations.
You have a robust internal security team.
Your team has bandwidth to monitor and respond to threats.
Managed SIEM + MDR
The cost of internal cybersecurity management is greater than the benefit of full control.
You have limited internal cybersecurity staff (or none at all).
You need a partner monitoring your environment and responding to threats 24/7/365.
Can an MSSP provide SIEM and XDR or MDR capabilities?
Yes, an MSSP can provide SIEM and XDR or MDR capabilities, but how they deliver each one varies significantly. The key distinction is whether the MSSP is simply managing tools, operating a security function, or taking responsibility for outcomes.
MDR is a service model that includes EDR (endpoint detection and response software) or XDR (extended detection and response software) wrapped in a managed service. XDR takes the capabilities of EDR and extends them to technologies and systems beyond traditional endpoints.
An MSSP can provide MDR capabilities, managing either type of detection and response software on behalf of a customer. However, note that not all MSSPs provide true MDR, which requires 24/7/365 human-led investigation and active response authority. The question ultimately comes down to whether the MSSP is responsible for security outcomes—or just the management of cybersecurity systems.
Likewise, many MSSPs manage their customers’ SIEM solutions. They deploy and configure the customer’s SIEM, then transition to ongoing management, which includes alert monitoring and triage, reporting, and strategic recommendations.
The takeaway: Get the right mix of SIEM + detection and response
The modern threat environment is too complex and fast-moving to leave things to chance. Every organization needs to 1) record and analyze cybersecurity data and 2) monitor and respond to threats. SIEM combined with MDR or XDR helps organizations solve these problems. If you need assistance protecting your environment, get in touch with us. Corsica Technologies has helped 1,000+ companies solve their toughest technology problems. Contact us today, let’s take the next step on your cybersecurity journey.
Ross Filipek is Corsica Technologies’ CISO. He has more than 20 years’ experience in the managed cyber security services industry as both an engineer and a consultant. In addition to leading Corsica’s efforts to manage cyber risk, he provides vCISO consulting services for many of Corsica’s clients. Ross has achieved recognition as a Cisco Certified Internetwork Expert (CCIE #18994; Security track) and an ISC2 Certified Information Systems Security Professional (CISSP). He has also earned an MBA degree from the University of Notre Dame.
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