Security monitoring combines logs, metrics, events and contextual data to identify suspicious activity and service degradation. A SIEM platform can centralise and correlate events, but its value depends on source coverage, time accuracy, detection logic, analyst processes and response ownership.
Choose important log sources
Prioritise identity providers, endpoints, firewalls, VPN gateways, DNS, email security, cloud control planes, servers, critical applications and backup platforms. Record what each source can reveal, retention requirements and who owns its health. Protect logs from unauthorised alteration and deletion.
Normalise and enrich
Synchronise systems to trusted time sources. Standardise timestamps, hostnames, usernames and asset identifiers. Add context such as device criticality, user role, network zone and known maintenance windows. Poor parsing and inconsistent identity fields can create blind spots or misleading correlations.
Detection engineering
Start with high-value use cases: privileged role changes, suspicious authentication, disabled security agents, unexpected remote access, unusual data transfers, malware detections and backup deletion attempts. Tune thresholds against baseline behaviour and document expected false positives. Every alert should include evidence and recommended triage steps.
Incident workflow
Triage the alert, validate scope, identify affected identities and assets, preserve evidence, contain safely and escalate according to severity. Record decisions and timestamps. After resolution, improve detection logic, controls and runbooks based on lessons learned.
Operational metrics
Measure log-source coverage, ingestion delay, alert volume, false-positive rate, mean time to acknowledge and mean time to contain. Review whether critical alerts are routed to an on-call owner and whether runbooks remain accurate.
- Confirm the control has a named owner and documented business purpose.
- Validate configuration against current vendor guidance and organisational policy.
- Test expected and denied access paths; retain evidence of the result.
- Monitor exceptions, failures and configuration changes.
- Review the control after material infrastructure or business changes.
Effective monitoring is not about collecting everything; it is about collecting the right evidence and turning it into timely action.