Indicator field trigger scripts - Administrator Guide - Cortex XSIAM - Cortex

Indicator field trigger scripts - Administrator Guide - Cortex XSIAM - Cortex - Security Operations

Cortex XSIAM Administrator Guide

Product

Cortex XSIAM

Creation date

2024-07-16

Last date published

2024-10-01

Category

Administrator Guide

Abstract

Associate Cortex XSIAM indicator fields with scripts that are triggered when the field changes.

You can associate indicator fields with trigger scripts that check for field changes, and then take actions based on them. These scripts can perform any action when the conditions are met. Indicator field trigger scripts allow indicators to become a proactive force within Cortex XSIAM. For example, you can:

Define a script that will run when the Verdict field of an indicator has changed. For example, the script will fetch all incidents related to that indicator, and take any action that is configured (reopen, change severity, etc.).

Define a script that will run when the Expiration Status field has changed. For example, you can define a script that will immediately update the relevant allow/block list (and not wait for the next iteration) as seen in the following script example:

indicators = demisto.args().get('indicators')
new_value = demisto.args().get('new')

indicator_values = []
for indicator in indicators:
    current_value = indicator.get('value')
    indicator_values.append(current_value)

if new_value == "Expired":
    # update allow/block list regarding expired indicators
else:
    # update allow/block list regarding active indicators

Scripts can be created in Python, PowerShell, or JavaScript in the Script page. To use a field trigger script, you need to add the field-change-triggered-indicator tag when creating the script. You can then add the script in the Attributes tab, when you edit or Create a Custom Indicator Field. If you did not add the tag when creating the script, the script is not available for use.

Trigger Script Arguments - Related Information

When a script is triggered on a field, it has the following triggered field information available as arguments (args):

Argument	Description
`associatedToAll`	If the field is associated to all or some incidents. Value: `true` or `false`.
`associatedTypes`	An array of the incident types, with which the field is associated.
`cliName`	The name of the field when called from the command line.
`description`	The description of the field.
`indicators`	A list of indicators that had the current change.
`isReadOnly`	Specifies whether the field is non editable. Value: `true` or `false`.
`name`	The name of the field.
`new`	The new value of the field.
`old`	The old value of the field.
`ownerOnly`	Specifies that only the creator of the field can edit. Value: `true` or `false`.
`placeholder`	The placeholder text.
`required`	Specifies whether this is a mandatory field. Value: `true` or `false`.
`selectValues`	If this is a multi-select type field, these are the values the field can take.
`system`	Whether it is a Cortex XSIAM defined field.
`type`	The field type.
`user`	The username of the user who triggered the script.

Script Limitations and Best Practices

Indicator field trigger scripts can be configured on: Verdict, Related Incidents, Expiration Status, Indicator Type, and all custom indicator fields in the system.
Indicator field trigger scripts work in all TIM (Threat Intelligence Management) scenarios and workflows, except for feed ingestion.
Fields that may hold a list (related incidents, multi-select/tag/role type custom fields) will provide an array of the delta. For example, if a multi-select field value has changed from ["a"] to ["a", "b"], the new argument of the script will get a value of ["b"].
Indicator field trigger scripts run as a batch. This means that if multiple indicators were changed in the same way and are set to trigger the same action, it will happen in one batch. For example:
1. There's a configured indicator field trigger script named myTriggerScript on the Verdict indicator field.
2. The Threat Intel Library has two existing Malicious indicators: 1.1.1.1, 2.2.2.2.
3. The user runs the following command !setIndicators indicatorsValues="1.1.1.1,2.2.2.2" verdict=Benign.
4. The myTriggerScript script will run just once, with the following parameters:
  - new - "Benign"
  - old - "Malicious"
  - indicators - "[{<indicator_1.1.1.1>},{<indicator_2.2.2.2}]"
When writing indicator field trigger scripts, it's crucial to avoid scenarios that call the scripts endlessly (for example, a change in field A triggers script X, which changes field B's value, and in turn calls script Y that changes field A's value).