What is Security Operations Center (SOC) as a Service (SOCaaS)? A comprehensive guide

SOC as a Service (SOCaaS) is a managed security service that gives organisations 24/7 monitoring, threat detection, incident response and security expertise without the cost and complexity of building a full in-house Security Operations Centre.

SOCaaS gives businesses access to continuous security operations, monitoring, specialist tooling and experienced analysts through a subscription-based model.

This guide explains what SOCaaS is, how it works and what to look for in a provider.

Introduction

Cyber threats are now a routine business risk, from ransomware and phishing to insider threats and unauthorised access.

Traditionally, that meant building an in-house Security Operations Centre. But that approach is expensive, difficult to scale and heavily dependent on specialist talent. SOC as a Service gives organisations an alternative: outsourced, cloud-based security operations delivered by a dedicated security team.

View Evalian’s managed SOC service

What is SOC as a Service? 

A security operations centre SOC as a service model gives businesses access to managed monitoring, investigation and incident response through an external provider, rather than building and staffing those capabilities in-house.

Delivered through a managed, cloud-based model, SOCaaS provides round-the-clock monitoring and response without the cost and complexity of an in-house team.

Cyber threat actors don’t differentiate based on company size; it’s a constant danger to everyone.  

Organisations of all sizes face similar threats, and smaller businesses are often targeted because their defences are weaker. SOCaaS gives them access to stronger detection and response capabilities without enterprise-level overhead.

In practical terms, SOCaaS is a form of security as a service SOC delivery model that makes enterprise-grade security operations more accessible.

Read our guide to the difference between a SOC and SOCaaS. 

The benefits of SOC as a Service

SOCaaS gives you access to a specialist security team, improves threat detection and incident response without the cost of building a full in-house security function. Its main benefits are continuous coverage, expert support, scalability, predictable cost and compliance support.

24/7 security operations: Threats don’t follow business hours. SOCaaS provides continuous monitoring and response, so incidents are reviewed as they happen.

Access to specialist security expertise: SOCaaS gives businesses access to experienced analysts, engineers and incident responders without hiring that capability internally.

Scalable, cloud-based delivery: As organisations grow, a cloud-based SOCaaS model scales more easily than a traditional in-house setup.

More predictable costs than an in-house SOC: SOCaaS replaces large upfront and staffing costs with a more predictable operating model.

Support for compliance and reporting: SOCaaS can support compliance by improving visibility, incident response and audit reporting.

Less pressure on internal IT and security teams: SOCaaS reduces pressure on internal teams by taking on day-to-day monitoring and detection.

Challenges and limitations of SOC as a Service

SOCaaS improves visibility, detection and response, but its effectiveness still depends on provider quality, internal processes and clear operating responsibilities.

Common challenges include:

• Shared responsibility: your provider can monitor and respond, but your business still owns risk, governance and key security decisions.
• Onboarding effort: connecting log sources, tuning alerts and documenting escalation routes takes time.
• Integration complexity: older infrastructure, fragmented cloud estates and inconsistent tooling can slow implementation.
• False positives early on: most services need a tuning period before alert quality improves.
• Variable service quality: not every SOCaaS provider offers the same depth of investigation, response capability or communication standards.
• Data residency and compliance considerations: some organisations need to know exactly where logs are stored, who can access them and whether data crosses borders.

Choosing the right provider matters as much as choosing the right model.

How does SOCaaS work?

Most SOC as a service solutions follow the same basic model: data collection, analysis, investigation, response and reporting.

1. Data collection
Logs and telemetry are collected from endpoints, firewalls, cloud platforms, identity systems, applications and network devices.

2. Centralised analysis
That data is ingested into tools such as SIEM, XDR and threat intelligence platforms to identify suspicious behaviour and known indicators of compromise.

3. Investigation
Security analysts review alerts, remove false positives and determine whether activity represents a genuine threat.

4. Incident response
Where necessary, the provider escalates the issue or takes agreed containment actions, such as isolating devices, blocking malicious traffic or supporting internal response teams.

5. Reporting and improvement
The provider reports on incidents, trends and opportunities to improve detection and response.

How SOC as a Service can thwart ransomware

SOCaaS helps reduce ransomware risk through earlier detection, monitoring for lateral movement and faster incident response before encryption spreads. It helps organisations respond to cybersecurity threats more quickly and consistently.

SOC vs SIEM vs MDR: What’s the difference and how do they relate? 

SOC, SIEM, MDR and XDR are related but serve different roles.

What is SOC?

A Security Operations Centre (SOC) is the function responsible for monitoring, detecting and responding to security incidents.

What is SIEM? 

A Security Information and Event Management (SIEM) collects and correlates logs across systems to identify potential threats. It supports the SOC by providing visibility and context, but does not replace investigation or response.

What is MDR? 

Managed Detection and Response (MDR) combines ongoing monitoring, threat hunting and direct response actions such as isolating compromised endpoints. It is narrower in scope than SOCaaS.

What is SOCaaS? 

SOCaaS, Security Operations Centre as a Service, combines these capabilities into a managed security operations service.

What is XDR?

XDR brings together telemetry across endpoints, identity, email, cloud and networks to improve detection across multiple layers of the environment.

Who benefits most from SOCaaS?

SOC for start-ups 

Startups gain enterprise-level protection without building a security function. This supports rapid growth and helps meet compliance requirements early.

SOC for regulated industries 

Regulated organisations use SOCaaS to strengthen monitoring, support compliance and demonstrate security maturity.

Read our series of guides on NIS 2.

SOC as a Service for medium-sized organisations 

SOCaaS offers a genuinely flexible and scalable alternative that can grow with the business and cover everything from advanced endpoint detection to incident response, all without committing to those massive upfront costs.

Understand your realistic costs for outsourcing your SOC, using our handy SOC cost calculator.

SOC Cost Calculator 

SOC for enterprise organisations

Larger enterprises often use SOCaaS to extend coverage, add redundancy or support out-of-hours monitoring.

Technologies commonly used in SOCaaS

SOCaaS is typically delivered through cloud-based platforms that combine multiple tools for monitoring, detection, investigation and response.

Common components include:

• SIEM (Security Information and Event Management): centralises and correlates security events from across the estate
• XDR (Extended Detection and Response): improves visibility across endpoints, identities, email, cloud and network activity
• EDR (Endpoint Detection and Response): focuses on endpoint monitoring, detection and containment
• SOAR (Security Orchestration, Automation and Response): supports automation, workflow orchestration and repeatable incident response
• Threat intelligence platforms: enrich alerts with context on known threat actors, tactics and indicators
• Vulnerability management tools: identify weaknesses that may increase exposure
• Case management and reporting tools: support investigations, escalation and audit trails

A good SOCaaS provider should explain clearly:

• Which tools they use
• How those tools integrate with your existing environment
• and where human analysis adds value beyond automation

The value depends on how well these tools are configured and used by experienced analysts.

How to choose the right SOCaaS provider 

Choosing the right SOC as a service provider means looking beyond features alone and assessing service depth, integrations, analyst capability and compliance support.

1. Define your objectives
Are you trying to improve threat detection, reduce incident response times, support compliance, extend internal coverage or replace an in-house SOC?

2. Confirm scope and coverage
Identify which systems, cloud services, endpoints, identities and business-critical assets must be monitored.

3. Review service depth
Check whether the provider offers monitoring only, investigation, containment support, threat hunting, compliance reporting and strategic guidance.

4. Check integration capability
Make sure the provider can work with your existing SIEM, EDR, XDR, cloud platforms and identity stack.

5. Assess the people behind the service
Ask about analyst-to-client ratios, escalation routes, named contacts, sector experience and incident response capability.

6. Agree SLAs and communications
Define escalation paths, reporting frequency, alert priorities, response expectations and who can approve containment actions.

7. Validate compliance and data handling
Ask where data is stored, how long it is retained, who can access it, and how the service supports frameworks such as GDPR, ISO 27001, HIPAA or PCI DSS.

Essential Guide to choosing a SOC provider: Free Checklist

Many SOC providers look like they offer the same services on the surface, but won’t tell you if they can’t isolate a compromised laptop straight away, or if their escalation process is unclear.

Use this SOC Provider Checklist to help you ask the right questions. It’s the same set of checks we use ourselves.

Download your free copy of the SOC Provider Checklist.

How long does SOCaaS onboarding take?

SOCaaS onboarding typically takes between 2 and 12 weeks, depending on the size of the environment, the number of integrations, the maturity of existing tooling and the complexity of escalation requirements.

For complex hybrid or multi-cloud environments, onboarding may take longer. Most onboarding programmes include:

1. Kick-off & Scoping (1-5 days): This is where both parties agree on the goals of the service, identify key systems and components, define what needs to be monitored, and document any applicable compliance requirements (like ISO 27001 or PCI, DSS). 
2. Tooling Deployment (1-2 weeks): The provider deploys the necessary tooling: log collection agents, EDR platforms and integrations with your existing SIEM. The deployment time vary significantly depending on the size, age and architecture of your environment. 
3. Integration & Log Source Configuration (2-6 weeks): The provider configures log forwarding from servers, firewalls, cloud platforms (like Amazon AWS or Microsoft Azure), and other data sources into the SOCaaS provider’s systems. 
4. Tuning & Optimisation (1-2 weeks): This involves adjusting alert thresholds, identifying and suppressing false positives, as well as things like tagging critical systems to make sure that there are meaningful and accurate alerts. This step is vital for avoiding ‘alert fatigue’. 

6. Runbook & Playbook Development (1-2 weeks): Focuses on defining clear incident response procedures. It includes specifying who gets notified during incidents and outlines the steps that should be taken. This is about creating a robust and reliable escalation process. 
7. Testing & Validation (1 week): Rigorous testing and validation of alerting, response workflows, and reporting capabilities. You’ll often have simulated incident scenarios to verify that the system responds exactly as expected.

SOCaaS FAQs

How does SOCaaS compare to an in-house SOC?

An in-house SOC is built and run internally as a managed security model designed to improve detection, response and visibility. SOCaaS delivers the same core capabilities through a managed service, usually with lower cost and less operational overhead.

Will I lose control of my security operations?  

No. You retain control over strategy, policy and risk decisions, while the provider handles agreed monitoring and response activities. Learn more: SOC Visibility Control.

Is my data safe with a SOCaaS provider?  

Leading SOCaaS providers operate under strict security protocols and adhere to industry-recognised standards like ISO 27001 and GDPR. This means things like end-to-end encryption to protect your data both in transit and at rest.  

Thoroughly vet any potential provider’s security credentials, data architecture, and incident response plans. 

Is SOC as a Service suitable for small businesses?  

Yes, SOC as a Service is particularly well-suited for smaller businesses that often lack the internal security resources and expertise to build and maintain a fully functional SOC.  

SOCaaS gives organisations a practical way to mature security operations

SOC as a Service helps organisations strengthen threat detection, improve incident response and access specialist security expertise without the cost of building a full in-house SOC.

If your organisation is weighing the cost of an in-house SOC against the need for 24/7 monitoring, SOCaaS is worth serious consideration.

For many organisations, SOCaaS is a practical security solution when in-house coverage is limited.

Contact us about our CREST-accredited SOC as a Service