Suspicious Encrypting File System Remote call (EFSRPC) to domain controller

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 EAL Logs OR XDR Agent with eXtended Threat Hunting (XTH)
ATT&CK Tactic	Lateral Movement (TA0008)
ATT&CK Technique	Use Alternate Authentication Material: Pass the Hash (T1550.002)
Severity	Medium

Description

An Encrypting File System Remote call (EFSRPC) was made to a domain controller.

Attacker's Goals

An attacker is attempting to steal credentials and move laterally within a network.

Investigative actions

• Check for suspicious processes on the host.
• Check if the source host is a vulnerability scanner.
• Look for following suspicious connections using the DC machine account.