Detectors

Type	Name	Severity	Module	Data source / event	ATT&CK
Analytics	Abnormal connections to a dormant host from a newly seen endpoint The endpoint has performed multiple connections to an endpoint that is relatively inactive on the network.	Informational	Platform Analytics	Palo Alto Networks Firewall traffic Logs, XDR Agent	Discovery
Analytics	Failed Connections The endpoint has failed connections to other endpoints that have been inactive for more than 24 hours, or that Cortex XDR Analytics has never seen on the network. The endpoint has made an abnormally large number of these failed connections and/or is attempting to connect to an abnormal mixture of missing or inactive endpoints. Your network might contain legitimate scanners that could cause a false positive for this alert. Cortex XDR Analytics attempts to filter these out by checking if a scanner has been active for a long consecutive period of time. Consequently, if this alert is seen, it represents new activity on your network. An attacker may be trying to move laterally, or to scan different parts of the network to look for other endpoints that expose a specific service. Worms also perform a similar activity to automatically infect additional hosts in the network.	Low	Platform Analytics	Palo Alto Networks Firewall traffic Logs, XDR Agent, Third-Party Firewalls	Discovery
Analytics	Kerberos User Enumeration A high amount of Kerberos principal unknown errors were generated on users in the last hour. This may be indicative of Kerberos user enumeration.	Medium	Identity Analytics	Palo Alto Networks Firewall traffic Logs, XDR Agent	Discovery
Analytics	Port Scan The endpoint connected, or attempted to connect, to multiple privileged ports, which are infrequently used by other endpoints (i.e. destination ports that are normally used by many endpoints will not raise this alert). Attackers perform port scans for reconnaissance purposes, to find computers or servers that accept connections on these ports, and to find vulnerable services that can be exploited. Coverage for port scans using data arriving solely from Cortex agents is incomplete.	Informational	Platform Analytics	Palo Alto Networks Firewall traffic Logs, Third-Party Firewalls	Discovery
Analytics	Port Sweep The endpoint connected, or attempted to connect, to multiple hosts using privileged ports that serve a well-defined function. Attackers perform port sweep for reconnaissance purposes, to find computers or servers that accept connections on these ports, and to find vulnerable services that can be exploited. Coverage for port sweeps using data arriving solely from Cortex agents is incomplete.	Informational	Platform Analytics	Palo Alto Networks Firewall traffic Logs, XDR Agent, Third-Party Firewalls	Discovery

Analytics

Abnormal connections to a dormant host from a newly seen endpoint The endpoint has performed multiple connections to an endpoint that is relatively inactive on the network.

Informational

Platform Analytics

Palo Alto Networks Firewall traffic Logs, XDR Agent

Discovery

Analytics

Failed Connections The endpoint has failed connections to other endpoints that have been inactive for more than 24 hours, or that Cortex XDR Analytics has never seen on the network. The endpoint has made an abnormally large number of these failed connections and/or is attempting to connect to an abnormal mixture of missing or inactive endpoints. Your network might contain legitimate scanners that could cause a false positive for this alert. Cortex XDR Analytics attempts to filter these out by checking if a scanner has been active for a long consecutive period of time. Consequently, if this alert is seen, it represents new activity on your network. An attacker may be trying to move laterally, or to scan different parts of the network to look for other endpoints that expose a specific service. Worms also perform a similar activity to automatically infect additional hosts in the network.

Low

Platform Analytics

Palo Alto Networks Firewall traffic Logs, XDR Agent, Third-Party Firewalls

Discovery

Analytics

Kerberos User Enumeration A high amount of Kerberos principal unknown errors were generated on users in the last hour. This may be indicative of Kerberos user enumeration.

Medium

Identity Analytics

Palo Alto Networks Firewall traffic Logs, XDR Agent

Discovery

Analytics

Port Scan The endpoint connected, or attempted to connect, to multiple privileged ports, which are infrequently used by other endpoints (i.e. destination ports that are normally used by many endpoints will not raise this alert). Attackers perform port scans for reconnaissance purposes, to find computers or servers that accept connections on these ports, and to find vulnerable services that can be exploited. Coverage for port scans using data arriving solely from Cortex agents is incomplete.

Informational

Platform Analytics

Palo Alto Networks Firewall traffic Logs, Third-Party Firewalls

Discovery

Analytics

Port Sweep The endpoint connected, or attempted to connect, to multiple hosts using privileged ports that serve a well-defined function. Attackers perform port sweep for reconnaissance purposes, to find computers or servers that accept connections on these ports, and to find vulnerable services that can be exploited. Coverage for port sweeps using data arriving solely from Cortex agents is incomplete.

Informational

Platform Analytics

Palo Alto Networks Firewall traffic Logs, XDR Agent, Third-Party Firewalls

Discovery