Security information and event management
SIEM · A system that collects logs from different systems in one place, correlates them to detect suspicious events and raises alerts.
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Why it matters
The traces of an attack are often scattered across systems: a connection on the firewall, failed sign-ins on a server, a suspicious attachment in e-mail. SIEM joins these pieces and notices that events meaningless on their own add up to an attack. It also keeps logs for a set period for audits.
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Example
SIEM sees many failed sign-ins for the same user, then a successful one, and shortly after a large file download. Combined, the three events raise a high-priority alert and the account is put under review.
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Common mistake
Collecting every log from every system without filtering. Costs climb fast and real alerts get lost in the noise; decide in advance what to collect and why.
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