Definition
Security Information and Event Management (SIEM) is a technology solution that collects, aggregates, and analyzes security event data from across an organization's IT infrastructure. SIEM provides real-time monitoring, threat detection, correlation of security events, and compliance reporting.
People Also Ask
Common questions about SIEM answered by our security experts.
SIEM in Practice
Security information and event management collects logs from across an environment, normalises them, correlates events and raises alerts. It is the traditional centre of a monitoring function and among the most commonly disappointing security investments.
The disappointment has a consistent cause: the platform was purchased and deployed, and the detection engineering that makes it useful was never resourced.
Ingestion is not detection
A great many deployments succeed at collecting logs and stop there. Data arrives, storage grows, dashboards exist, and nothing in the system is looking for anything in particular beyond the vendor's default rules.
Default content is a starting point calibrated for a generic environment. The detections that catch real activity in your estate depend on knowing what normal looks like there, and that knowledge is not shipped with the product.
Cost drives the architecture more than anyone admits
Licensing is usually tied to data volume, which creates constant pressure to send less. The result is that the decision about what to monitor gets made by budget rather than by risk, and the logs excluded are frequently high-volume sources such as network traffic or endpoint telemetry that matter during an investigation.
Tiered approaches help: high-value sources into the platform for real-time detection, bulk sources into cheaper storage that can be searched when needed. The design question is which data you need to alert on versus which you need to be able to retrieve.
Tuning is continuous, not a phase
Rules degrade. Environments change, applications are replaced, new systems arrive, and a detection written eighteen months ago either stops firing or starts firing constantly. Neither failure announces itself.
A rule that has not fired in a year needs checking — it may be well-targeted or it may be broken, and the two are indistinguishable without review. Detection content deserves the same lifecycle discipline as code.
Retention and the dwell time problem
Intrusions are frequently present for months before discovery. Logs retained for thirty days cannot answer what an attacker did, which means the investigation cannot establish scope and the organisation cannot make honest statements about what was accessed.
Retention is therefore an incident response requirement rather than a compliance checkbox, and it is worth costing on that basis.
Where the newer alternatives fit
XDR platforms provide correlated detection across a vendor's own telemetry with far less engineering effort, and cover less of the estate. Many organisations end up running both: the platform for depth in endpoint and identity, the log platform for everything else and for the custom and compliance-driven sources.
Where to start
Ask how many detection rules were written locally in the last year and how many alerts fired from them. The answer establishes whether you own a detection capability or a searchable archive.
See an expensive log dump, tuning without missing threats and implementation. GuardsArm delivers managed security.
Related Terms
Incident Response
Incident response is the organized approach to addressing and managing the aftermath of a security breach or cyberattack. The goal is to handle the situation in a way that limits damage, reduces recovery time and costs, and prevents future incidents.
Endpoint Detection and Response
Endpoint Detection and Response (EDR) is a cybersecurity solution that continuously monitors and collects data from endpoints (laptops, desktops, servers, mobile devices) to detect, investigate, and respond to cyber threats in real time.
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