SIEM
Security Information and Event Management
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."