FortiGate ICS Alert: Exploitation of Remote Services

Rule ID

PH_RULE_ICS_FORTIGATE_Exploitation_of_Remote_Services

Default Status

Enabled

Description

A FortiGate product has detected an event containing MITRE ICS Technique ID T0866 - Exploitation of Remote Services. Adversaries may exploit a software vulnerability to take advantage of a programming error in a program, service, or within the operating system software or kernel itself to enable remote service abuse.

Severity

MITRE ATT&CK® Tactics

Initial Access ICS

MITRE ATT&CK® Techniques

Impacts

Network

Data Source

FortiGate via Syslog

Detection

Correlation

Remediation Guidance

Investigate the source, and determine if the event was legitimate.

Time Window

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

300 seconds

Trigger Conditions

If the following defined pattern/s occur within a 300 second time window.

mitre_ics_event

SubPattern Definitions

SubPattern Name: mitre_ics_event

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 IN ("FortiGate-ips-signature-50485","FortiGate-ips-signature-50490","FortiGate-ips-signature-50512","FortiGate-ips-signature-50513","FortiGate-ips-signature-50514","FortiGate-ips-signature-50515")

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

srcIpAddr,destIpAddr,eventType

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

 compEventType=mitre_ics_event.eventType,
srcIpAddr=mitre_ics_event.srcIpAddr,
destIpAddr=mitre_ics_event.destIpAddr,
incidentCount=mitre_ics_event.COUNT(*)

FortiSIEM Rules