Does my business need a SIEM?

If you handle sensitive data, have compliance requirements, or want proactive threat detection, yes. For mid-market businesses, cloud-native SIEMs (Microsoft Sentinel) or managed SIEM services provide capability without the cost of building a security operations centre. Even basic SIEM coverage of critical systems significantly improves security posture.

How much does a SIEM cost?

SIEM costs depend primarily on data ingestion volume. Microsoft Sentinel: approximately $3-5 per GB of data ingested. For a mid-market business logging critical systems: $500-$3,000/month. Managed SIEM services: $2,000-$10,000/month. The cost is justified when compared against the average breach cost of $4 million.

Should I build or buy SIEM capability?

Most mid-market businesses should buy: use a cloud-native SIEM (Microsoft Sentinel) with managed service support. Building an in-house SOC requires 4-6 security analysts ($500,000+/year in salaries). Managed SIEM services provide 24/7 monitoring at a fraction of the cost. Consider building in-house only when your security team exceeds 5-10 people.

Book Free Assessment Calculator

SIEM

Security Information and Event Management

Also known as:security information and event managementsecurity monitoring platformlog management and analysis

Security Information and Event Management -- a platform that collects, analyses, and correlates security data from across an organisation to detect threats and support incident investigation.

In-Depth Explanation

SIEM (Security Information and Event Management) aggregates and analyses security data from across an organisation's technology environment. It combines Security Information Management (SIM) and Security Event Management (SEM) to provide real-time threat detection, investigation, and compliance reporting.

How SIEM works:

Collection: Ingests logs from firewalls, servers, applications, endpoints, cloud services
Normalisation: Standardises data from different sources into a common format
Correlation: Analyses events across sources to identify patterns and threats
Alerting: Generates alerts when suspicious activity is detected
Investigation: Provides tools to investigate and understand threats
Reporting: Generates compliance and security reports

SIEM data sources:

Firewall and network device logs
Server and operating system logs
Application logs (web servers, databases)
Cloud service logs (AWS CloudTrail, Azure logs)
Endpoint protection alerts
Email security logs
Identity and access management logs
DNS and web proxy logs

SIEM platforms:

Microsoft Sentinel: Cloud-native SIEM integrated with Azure and Microsoft 365
Splunk: Powerful data analytics and SIEM
IBM QRadar: Traditional SIEM with strong correlation
Elastic Security: Open-source based SIEM
Sumo Logic: Cloud-native analytics and SIEM
CrowdStrike LogScale: Fast log management with SIEM capabilities

Modern SIEM capabilities:

Machine learning-based anomaly detection
User and Entity Behaviour Analytics (UEBA)
Security Orchestration, Automation, and Response (SOAR)
Threat intelligence integration
Automated incident response playbooks
Cloud-native deployment and scaling

SIEM for mid-market businesses:

Microsoft Sentinel is cost-effective for Microsoft-centric environments
Managed SIEM services provide capability without building a SOC team
Cloud-native SIEMs eliminate infrastructure management
Start with critical data sources and expand coverage over time

Business Context

SIEM reduces the average time to detect a security breach from 287 days to 56 days, and faster detection directly correlates with lower breach costs. Organisations that detect breaches within 200 days save an average of $1.2 million.

How Clever Ops Uses This

Clever Ops implements SIEM solutions for Australian businesses, typically using Microsoft Sentinel for its cost-effectiveness and integration with common business tools. We configure log collection, build detection rules, and create alert workflows that give businesses visibility into security threats without requiring a dedicated security operations team.

Example Use Case

"An Australian business deploys Microsoft Sentinel, collecting logs from Azure AD, Microsoft 365, firewall, and endpoint protection. Within the first month, Sentinel detects and alerts on a compromised employee account being used from an unusual overseas location at 2am, enabling rapid response."