NTLM Hash Harvesting

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	1 Hour
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	Credential Access (TA0006)
ATT&CK Technique	OS Credential Dumping (T1003)
Severity	Medium

Description

An unusual number of users has sent NTLM to a target in the last hour. This may be indicative of poisoning and NTLM hash harvesting.

Attacker's Goals

The attacker may attempt to extract NTLM hashes for credential access.

Investigative actions

• Check that the destination is not a server.
• Verify that the destination is not external to the organization.