What it means
An alert packages a detection condition for attention. It might come from a fixed rule, a statistical model, or a person noticing something unusual. Its title is a hypothesis, and its severity is an initial assessment. An alert should point to the underlying observations and explain why the detector matched. Several alerts can describe one incident; an incident can also begin with a customer report and no machine alert. Some alerts are handled automatically, but their meaning and allowed response still need clear boundaries.
AN ILLUSTRATIVE SCENARIO
An unfamiliar sign-in location
A finance employee’s account signs in from two distant locations within minutes. The alert could indicate stolen access, but a corporate network gateway can also explain the location change. The analyst checks timestamps, session identifiers, device information, and subsequent account actions. Finding a new payment instruction changes the urgency; the geographic label alone does not establish fraud or justify every possible containment action.
Put it to work
- Describe the behavior a detection is intended to catch and which records trigger it. Give each alert enough evidence to start investigation without guessing.
- Assign a responsible queue, expected response time, and escalation conditions. Distinguish an analyst’s acknowledgement from investigation or resolution.
- Record the disposition and supporting reason. Use reviewed outcomes to improve the detection, while retaining examples that reveal unexpected legitimate behavior.
How to check your work
Trigger a harmless test that meets the detection condition. Check that it reaches the right queue, contains source evidence, and has an actionable next step. Test a similar legitimate case to understand noise.
Connect the ideas
- Log
A record emitted by a system that something happened, which may later be used as evidence.
- Incident
An event or set of events that actually or potentially causes a security loss requiring coordinated handling.
- Triage
A short, time-boxed judgment of severity, uncertainty, and next action when an alert arrives.
- False positive
An alert that did not represent the harmful event the detector was meant to catch.