What is a SIEM (Security Information and Event Management)
A SIEM (Security Information and Event Management) is the platform that collects, normalises and correlates security logs and events from across the infrastructure (endpoint, network, cloud, identity) to detect suspicious activity through rules and analytics. It is the technological core of a SOC: it gives centralised visibility, but it generates many alerts. You need a team to interpret them and good threat intelligence to cut the noise.
The technological core of the SOC
A SIEM is where the logs from across the company converge: firewall, endpoint, servers, cloud, identity. It normalises and correlates them, looking for the patterns that reveal an attack. Without a SIEM, signals stay in disconnected silos; with a poorly governed SIEM, they drown in noise.
Visibility is not detection
Collecting logs is easy; turning them into useful detection is not. You need rules mapped to MITRE ATT&CK, continuous tuning and threat intelligence that gives context. That is the work that separates a SIEM that is merely “on” from a SIEM that protects.
A SIEM alone is not enough
A SIEM raises alerts that someone must interpret 24·7. That is why it lives inside a SOC: people and processes that turn correlation into decision. The service: Fortgale managed SOC.
SIEM vs SOAR vs XDR
| SIEM | SOAR | XDR | |
|---|---|---|---|
| What it does | Collects and correlates logs | Orchestrates and automates response | Correlates detection across domains |
| Focus | Visibility and detection | Playbook automation | Integrated detection & response |
| Data | Any log | Actions and workflows | Agent-based telemetry |
In Operation Storming Tide correlating the signals made it possible to reconstruct a multi-stage chain and contain it: a SIEM exists to see the thread linking seemingly unrelated events.
Read the analysis →Frequently asked.
Are SIEM and SOC the same thing?
No. The SIEM is the technology platform; the SOC is the outpost (people + processes) that uses it to detect and handle incidents. See What is a SOC.
What is the difference between SIEM and XDR?
A SIEM ingests and correlates any log (maximum visibility); XDR correlates agent-based telemetry across endpoint, identity, cloud (deeper detection on integrated domains). They often coexist.
What is a SOAR?
SOAR (Security Orchestration, Automation and Response) automates response workflows through playbooks, cutting manual work. It works downstream of the SIEM to accelerate containment.
Which SIEMs does Fortgale operate?
Fortgale delivers MDR and managed SOC on leading SIEMs such as Splunk Enterprise Security, Microsoft Sentinel, Elastic Security and Sumo Logic Cloud SIEM, in a technology-agnostic way on the customer's stack.
From theory to a real operation.
What you read here, Fortgale runs every day with a European SOC 24·7·365: 287 tools and actors profiled, <30 min median containment. Explore the service: Fortgale managed SOC.
Related resources: What is a SOC · MDR vs EDR vs XDR
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