Every day, servers, computers, firewalls, applications, network devices and cloud services generate thousands, or even millions, of events. Viewed individually, these events may often appear harmless. However, when they are brought together and analysed collectively, they can reveal the early signs of a cyberattack.
A SIEM collects this information in a single location and analyses it in real time using detection rules and correlation mechanisms. For example, if a user logs in from an unusual country, attempts to access several sensitive servers and makes numerous failed login attempts, the SIEM can link these events together and generate an alert before a major incident occurs.
A SIEM also plays an important role in security investigations. It keeps a record of events, allowing IT teams to reconstruct the sequence of an attack, identify its origin and implement the necessary measures to prevent it from happening again. It can also support compliance with certain regulatory requirements, particularly in relation to auditing and traceability.
On its own, a SIEM does not block cyberattacks. Its primary role is to detect, centralise and analyse security information so that teams can respond quickly. It is often used alongside a SOC, which monitors alerts, as well as solutions such as EDR and XDR, which help detect and neutralise threats across the company’s various systems and devices.
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By providing a comprehensive view of activity across the IT environment, a SIEM enables companies to detect security incidents more quickly, reduce their impact and strengthen their overall cybersecurity posture over the long term.