An expression for matching on any other source is 'source' != "Threat Detected".An expression for matching on the host is 'host' = "127.0.0.1".Value The field value in double quotes, which can be in string format or in state_variable notation, such as: 'host' = "127.0.0.1" or 'host' = "$host$".īased on an example event in. Comparison function The comparison function can be any of the following: =, !=, >, =, =,, <. Multivalue fields are supported, and an event is considered a match as long as one value matches. The expression is made up of field, comparison function, and value.įield The name of any SPL field in single quotes, such as: 'host', 'source', 'sourcetype', etc. You must use the logical operators of AND or OR in your grouping, such as: 'host' = "127.0.0.1" AND ('dest' = "" OR 'dest'=""). Wildcard matching (*) and regular expressions are not supported in the expression section. For example, SPL doesn't enforce AND/OR operators for field searches, but the event sequencing engine does. Note that while similar to SPL syntax, expressions in the event sequencing engine are more restricted than in standard SPL syntax. Expressions follow Splunk style syntax in the format of. The expression allows you to compare any field from an incoming event with a static value or a state variable (see state for further information). Wildcard matching (*) is supported on this field. The correlation search to match the source of the incoming notable or risk modifier. The match condition has two parts that are evaluated successively, correlation search and expression. The match condition defines the criteria for considering notable events or risk modifiers for transitioning through the phases in a template. Once the start condition is met, the event sequencing engine will start the execution of the corresponding sequence template. State variables can also be used as outputs in the final sequenced event. Optionally, the start section can define state variables to store field values for the purpose of matching further notables or risk modifiers. The start section defines match conditions for starting the execution of a template. The following diagram shows an example of the way that you can start with one correlation search (1), flow through any number of correlation searches in the transitions (2 through 5), and end with a final search (6). You can construct a sequence template using the editor. It has three main components: start, transitions, and end. See the status of a template.Ī sequence template defines the various constraints of constructing a sequence. This information can be viewed from the sequence lister page. The Event Sequencing Engine periodically stores information regarding the currently running sequence templates. Sequence templates are stored in the sequence_nf file. Once you have created a sequence template, it is available for execution within 5 minutes. Security analysts can provide specifications on how sequenced events are constructed by using sequence templates. The Event Sequencing Engine runs as a real-time search and listens for incoming notable events and risk modifiers that are triggered by correlation searches. The concept is also similar to that of meta notable events or named multi-vector notables, which are alerts that are generated by correlation searches monitoring for multiple specific conditions prior to raising the alert. The concept is similar to writing a script to automate the things that you might otherwise have to do manually when tracking a variety of notable events and variables through a variety of correlation searches. You create batches of events by defining a workflow to run correlation searches in an order of your choice, specifying what notable events would need to occur in order to advance to the next step. The Event Sequencing Engine provides capabilities for threat detection that allow you to group correlation searches into batches of events, either in a specific sequence, by specific attributes, or both. Create sequence templates in Splunk Enterprise Security
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