Step 2. Global variables

If tracking values in event fields, active lists, or dictionaries is not enough to cover some specific security scenarios, you can use global and local variables. You can use them to take various actions on the values received by the correlators by implementing complex logic for threat detection. Variables can be assigned a specific function and then queried from correlation rules as if they were ordinary event fields, with the triggered function result received in response.

To add a global variable in the correlator,

click the Add variable button and specify the following parameters:

• In the Variable window, enter the name of the variable.

  Variable naming requirements

  • Must be unique within the correlator.
  • Must contain 1 to 128 Unicode characters.
  • Must not begin with the character $.
  • Must be written in camelCase or CamelCase.
• In the Value window, enter the variable function.

  When entering functions, you can use autocomplete as a list of hints with possible function names, their brief description and usage examples. You can select a function from the list and insert it together with its list of arguments into the input field.

  Description of variable functions.

The global variable is added. It can be queried from correlation rules by adding the $ character in front of the variable name. There can be multiple variables. Added variables can be edited or deleted by using the icon.

Proceed to the next step of the Installation Wizard.

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