Sudden User Login Pattern Change

Rule ID

PH_Rule_Access_72

Default Status

Enabled

Description

Detects daily user login distribution anomaly against profile. This may indicate suspicious user behaviors.

Severity

MITRE ATT&CK® Tactics

Behavioral Anomaly

MITRE ATT&CK® Techniques

No Technique Specified

Impacts

Server

Data Source

FortiGate via Syslog, FortiProxy via Syslog, Juniper JunOS via Syslog, Juniper SRX Via Syslog, Juniper SSG via Syslog, Pulse Secure via Syslog, Hillstone Firewall Via Syslog, Cisco ASA via Syslog, Cisco IOS Via Syslog, WatchGuard via Syslog, Sophos Firewall via Syslog, SonicOS via Syslog, Riverbed via Syslog, NetScaler via Syslog, HP Procurve via Syslog, FortiWeb via Syslog, BlueCoat via Syslog, Windows via OMI or FortiSIEM Agent, Linux via Syslog, VMware NSX via Syslog, FortiSIEM via Syslog, IBM AIX via Syslog, AWS CloudTrail via AWS_CLOUDTRAIL, Office 365 via Management Activity API

Detection

Profiling

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.

Change

SubPattern Definitions

SubPattern Name: Change

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_USER_MON_SUDDEN_LOGIN_DISTRIBUTION_CHANGE"

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

computer,user,destName

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

 computer = Change.computer,
 user = Change.user,
 destName = Change.destName,
 incidentCount = Change.COUNT(*)

FortiSIEM Rules