Which QRadar component triggers the rules?

The Event Processor is the component in QRadar that triggers the rules. Its primary function is to analyze incoming event and flow data against the defined rules set within the system. When the Event Processor receives data, it evaluates that data to determine if any rules are matched based on the correlation and conditions specified.

The rules are essentially conditions that define what constitutes suspicious activity or an event of interest. When a set of criteria is met within the incoming data, the Event Processor activates the corresponding rule, which could lead to generating an alert, changing the incident status, or taking other defined actions.

In this context, the Event Collector, Log Source, and Flow Processor have distinct roles. The Event Collector is responsible for gathering log data from different sources, the Log Source is where the data originates, and the Flow Processor deals with network flow data, but it is the Event Processor that actively evaluates and triggers the rules based on the data processed. This distinction is crucial to understanding how QRadar effectively monitors and responds to security events.