FortiSIEM: Low Available EventDB Storage

Rule ID

PH_Rule_Avail_PH_1

Default Status

Disabled

Description

Detects the free space of the file system containing the folder /data/eventdb used for storing events is lower than a warning threshold - default 20GB. Once the free space is lower than critical threshold (default 10GB), the system will automatically purge old events until the free space is more than 20GB.

Severity

MITRE ATT&CK® Tactics

FortiSIEM

MITRE ATT&CK® Techniques

No Technique Specified

Impacts

Internal

Data Source

FortiSIEM Self Monitoring

Detection

Correlation

Remediation Guidance

Identify the root cause and solve the issue

Time Window

If the following pattern or patterns match an ingested event within the given time window in seconds, trigger an incident.

600 seconds

Trigger Conditions

If the following defined pattern/s occur within a 600 second time window.

AOStorageLow

SubPattern Definitions

SubPattern Name: AOStorageLow

This is the named definition of the event query, this is important if multiple subpatterns are defined to distinguish them.

SubPattern Query

This is the query logic that matches incoming events

phEventCategory = 3 AND eventType = "PH_SYSTEM_STORAGE_LOW"

Group by Attributes

This defines how matching events are aggregated, only events with the same matching attribute values are grouped into one unique incident ID

reptDevName

Aggregate Constraint

This is most typically a numerical constraint that defines when the rule should trigger an incident

COUNT (*) >= 1

Incident Attribute Mapping

This section defines which fields in matching raw events should be mapped to the incident attributes in the resulting incident.

The available raw event attributes to map are limited to the group by attributes and the aggregate event constraint fields for each subpattern

 hostName = AOStorageLow.reptDevName

FortiSIEM Rules