PH_Rule_OT_1
Enabled
Detects Modbus Write Command from a Source IP not defined in Operational Technology Business Service (Purdue) Level 2
7
Security
No Technique Specified
Network
FortiGate via Syslog
Correlation
No remediation guidance specified
If the following pattern or patterns match an ingested event within the given time window in seconds, trigger an incident.
300 seconds
If the following defined pattern/s occur within a 300 second time window.
OTFilter
This is the named definition of the event query, this is important if multiple subpatterns are defined to distinguish them.
This is the query logic that matches incoming events
serviceName = "MODBUS" AND eventType = "FortiGate-appctrl-ips-pass" AND usrMsg CONTAIN "Modbus_Write" AND srcIpAddr NOT IN (BizService@PH_SYS_BizSrvc_OT_L2)
This defines how matching events are aggregated, only events with the same matching attribute values are grouped into one unique incident ID
srcIpAddr,destIpAddr
This is most typically a numerical constraint that defines when the rule should trigger an incident
COUNT(*) >= 1
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 = OTFilter.srcIpAddr,
destIpAddr = OTFilter.destIpAddr