High throughput VPN session

Rule ID

PH_Rule_PolicyViolation_23

Default Status

Enabled

Description

Detects that a VPN session consistently consuming more than 1 Mbps over a period of 15 minutes

Severity

MITRE ATT&CK® Tactics

Audit

MITRE ATT&CK® Techniques

No Technique Specified

Impacts

Network

Data Source

Cisco ASA VPN Monitoring via SNMP

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.

900 seconds

Trigger Conditions

If the following defined pattern/s occur within a 900 second time window.

LongVpn

SubPattern Definitions

SubPattern Name: LongVpn

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_DEV_MON_CISCO_RAS_VPN_MET"

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

localVpnIpAddr,user,userGrp

Aggregate Constraint

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

COUNT(*) >= 10 AND (AVG(sentBitsPerSec) > 1000000 OR AVG(recvBitsPerSec) > 1000000)

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 = LongVpn.localVpnIpAddr,
 user=LongVpn.user,
 userGrp=LongVpn.userGrp,
sentBitsPerSec = LongVpn.AVG(sentBitsPerSec),
 recvBitsPerSec = LongVpn.AVG(recvBitsPerSec)

FortiSIEM Rules