PH_Rule_Flow_206
Enabled
Detects 100 or more flows in 5 minutes, with invalid TCP flag combinations (NULL,FIN, SYN-FIN, SYN-FIN-PUSH, SYN-FIN-RESET, SYN-FIN-RESET-PUSH,SYN-FIN-RESET-PUSH-ACK-URG) - may indcate scanning and probing activity from the sender
7
Security
Discovery
Discovery consists of techniques an adversary may use to gain knowledge about the system and internal network. These techniques help adversaries observe the environment and orient themselves before deciding how to act. They also allow adversaries to explore what they can control and what’s around their entry point in order to discover how it could benefit their current objective. Native operating system tools are often used toward this post-compromise information-gathering objective.
https://attack.mitre.org/tactics/TA0007No Technique Specified
Network
FortiGate via Syslog or Netflow,Checkpoint via Syslog or Netflow, Palo Alto via Syslog or Netflow
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.
InvalidTCPFlag
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
ipProto = 6 AND srcDestTCPFlags IN (1,3,7,11,15,31,63) AND eventType IN (Group@PH_SYS_EVENT_BiNetflowTraffic)
This defines how matching events are aggregated, only events with the same matching attribute values are grouped into one unique incident ID
srcIpAddr
This is most typically a numerical constraint that defines when the rule should trigger an incident
COUNT(*) >= 100 AND COUNT(*) < 500
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 = InvalidTCPFlag.srcIpAddr,
incidentCount = InvalidTCPFlag.COUNT(*)