FortiSIEM CMDB Disk space low - prune successful

Rule ID

PH_Rule_Avail_PH_53

Default Status

Enabled

Description

Detects that FortiSIEM CMDB Disk space is below low threshold (cmdb_disk_space_low_threshold_MB). Incidents and Identity Location data older than month_retain_limit months were deleted to bring the free disk above high threshold (cmdb_disk_space_high_threshold_MB)

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.

CMDBFull

SubPattern Definitions

SubPattern Name: CMDBFull

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

eventType = "PH_AUDIT_CMDB_DISK_PRUNE_SUCCESS"

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

hostName

Aggregate Constraint

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

COUNT(*) >= 1 AND AVG(freeDiskMB) >= 0

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 = CMDBFull.hostName,
 freeDiskMB = CMDBFull.AVG(freeDiskMB)

FortiSIEM Rules