Rare NTLM Access By User To Host

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	1 Day
Required Data	Requires one of the following data sources: Palo Alto Networks Firewall traffic Logs OR XDR Agent
Detection Modules	Identity Analytics
ATT&CK Tactic	Lateral Movement (TA0008)
ATT&CK Technique	Use Alternate Authentication Material (T1550)
Severity	Informational

Description

An unusual NTLM authentication attempt by a user to a host. This may indicate the use of stolen credentials or access tokens to access restricted hosts.

Attacker's Goals

The attacker may be attempting lateral movement within a compromised network.

Investigative actions

• Verify any successful authentication for the user account referenced by the alert, as this could indicate the attacker has used stolen credentials.