PH_Rule_PolicyViolation_3
Enabled
Network IPS detects Tunneled traffic
7
Security
Command And Control
T1572
Protocol Tunneling
Adversaries may tunnel network communications to and from a victim system within a separate protocol to avoid detection/network filtering and/or enable access to otherwise unreachable systems. This behavior may conceal malicious traffic by blending in with existing traffic and/or provide an outer layer of encryption (similar to a VPN). Tunneling could also enable routing of network packets that would otherwise not reach their intended destination, such as SMB, RDP, or other traffic that would be filtered by network appliances or not routed over the Internet. Adversaries may perform SSH tunneling (also known as SSH port forwarding), DNS over HTTPS (DoH), queries to resolve C2 communications and infrastructure.
https://attack.mitre.org/techniques/T1572Application
FortiGate via Syslog, FortiProxy via Syslog, Checkpoint IPS-1 via LEA/Syslog, PaloAlto PAN-OS 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.
600 seconds
If the following defined pattern/s occur within a 600 second time window.
Tunnel
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
(reptDevIpAddr IN (Group@PH_SYS_DEVICE_NETWORK_IPS) OR (reptDevIpAddr IN (Group@PH_SYS_APP_NETWORK_IPS) AND eventType CONTAIN "Snort-")) AND eventType IN (Group@PH_SYS_EVENT_TunnelledTraffic)
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 = Tunnel.srcIpAddr,
destIpAddr = Tunnel.destIpAddr