FortiSIEM Rules

Website access policy violation: Multiple categories

Rule ID

PH_Rule_PolicyViolation_4B

Default Status

Enabled

Description

Detects excessive inappropriate website access from the same source IP address - excessive is defined by (more than 5 distinct categories in 1 hour

Severity

9

Category

Security

MITRE ATT&CK® Tactics

Policy Violation

MITRE ATT&CK® Techniques

No Technique Specified

Impacts

Application

Data Source

FortiGate via Syslog, FortiProxy via Syslog, FortiWeb via Syslog, TrendMicro Interscan Web Security via Syslog, Sophos Web Filter via Syslog

Detection

Correlation

Remediation Guidance

No remediation guidance specified

Time Window

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

3600 seconds

Trigger Conditions

If the following defined pattern/s occur within a 3600 second time window.

WebViolation

SubPattern Definitions

SubPattern Name: WebViolation

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_RULE_INAPPROPRIATE_WEB_TRAFFIC"

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

Aggregate Constraint

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

COUNT(DISTINCT webCategory) >= 5

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

 srcIpAddr = WebViolation.srcIpAddr