Creating Correlation Rules to Monitor Data Ingestion Health - Administrator Guide - Cortex XSIAM - Cortex

Creating Correlation Rules to Monitor Data Ingestion Health - Administrator Guide - Cortex XSIAM - Cortex - Security Operations

Cortex XSIAM Administrator Guide

Product

Cortex XSIAM

Creation date

2024-02-26

Last date published

2024-04-25

Example 1: No logs collected from a data source for 1 hour

In this example, the correlation runs every hour and calculates the number of logs that are collected for each data source over the previous hour. If no logs are collected for a data source during an aggregation period, a security alert is triggered.

Example XQL:

preset = metrics_view  
| comp sum(total_event_count) as total_event_count_sum by _collector_id, _collector_ip, 
_collector_name, _collector_type, _final_reporting_device_ip, _final_reporting_device_name,
 _broker_device_id, _vendor, _product 
| filter total_event_count_sum = 0

Addition fields to specify in the correlation rule:

Field	Value
Time Schedule	Hourly
Query time frame	1 Hour
Alert Suppression	Select Enable alert suppression.
Fields	Uncheck `total_event_rate_sum`, leave other fields checked.
Action	Select Generate alert.
Severity	High
Category	Collection
Alerts Fields Mapping	The fields in the `metrics_view` preset are not mapped to the Alerts Table. To enrich your investigation capabilities and enable automation on the fields in the correlation, you can create custom alert fields.

Example 2: No logs received from a Firewall for 20 minutes

In this example, the correlation runs every 20 minutes and calculates the number of logs that are received for each firewall in a lookup dataset during the last 20 minutes. If no logs are received from a device during an aggregation period, a security alert is triggered.

Example XQL:

preset = metrics_view  
| join conflict_strategy = left  type = inner (dataset = ngfw_device_Id_keepalive 
| fields _device_id) as devices devices._device_id = _device_id  | comp sum(total_event_count)
 as total_event_count_sum by _device_id, _product,_vendor 
| filter total_event_count_sum = 0

Addition fields to specify in the correlation rule:

Field	Value
Time Schedule	Every 20 minutes
Query time frame	20 minutes
Alert Suppression	Select Enable alert suppression.
Fields	Uncheck `total_event_rate_sum`, leave other fields checked.
Action	Select Generate alert.
Severity	High
Category	Collection
Alerts Fields Mapping	The fields in the `metrics_view` preset are not mapped to the Alerts Table. To enrich your investigation capabilities and enable automation on the fields in the correlation, you can create custom alert fields.