SIEM

SIEM (Security Information and Event Management) is a platform that aggregates logs from multiple sources, correlates security events, and provides real-time alerting and analysis.

SIEM platforms provide centralized visibility into security events across an organization's IT environment.

Core SIEM capabilities: - Log Collection: Aggregate logs from all systems - Normalization: Standardize log formats - Correlation: Connect related events across sources - Alerting: Real-time notification of threats - Dashboards: Visual representation of security posture - Reporting: Compliance and executive reports - Retention: Long-term log storage for compliance

Modern SIEM evolution: - Cloud-native SIEMs (Sumo Logic, Panther) - SOAR integration (automated response) - UEBA (user behavior analytics) - XDR convergence

Popular SIEMs: Splunk, Microsoft Sentinel, Sumo Logic, Datadog Security

Why It Matters

A SIEM is the nerve center of modern security operations, providing the centralized logging, real-time correlation, and alerting capabilities that compliance frameworks demand. Without a SIEM, security teams cannot detect multi-stage attacks that span multiple systems, meet log retention requirements, or generate the compliance reports auditors expect. Cloud-native SIEM options have made this capability accessible to organizations of all sizes.

Key Points

Centralizes security log management

Enables correlation of events across systems

Essential for compliance audit trails

Modern SIEMs include behavior analytics

Cloud-native SIEMs reduce complexity

Applicable Compliance Frameworks

SOC 2 ISO 27001 HIPAA PCI DSS

Related Terms

Audit Trail

An audit trail (or audit log) is a chronological record of system activities that provides documentary evidence of the sequence of events that have affected an operation or procedure.

Continuous Monitoring

Continuous monitoring is the ongoing, automated observation of security controls, systems, and networks to detect issues, ensure compliance, and respond to threats in real-time.

Incident Response

Incident response is a structured approach to preparing for, detecting, containing, and recovering from security incidents while minimizing damage.