Possible authentication coercion

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	1 Day
Required Data	XDR Agent with eXtended Threat Hunting (XTH)
Detection Modules	Identity Analytics
ATT&CK Tactic	Credential Access (TA0006)
ATT&CK Technique	Forced Authentication (T1187), Adversary-in-the-Middle: LLMNR/NBT-NS Poisoning and SMB Relay (T1557.001)
Severity	Informational

Description

An unusual Remote Procedure Call (RPC) was made to potentially cause authentication coercion.

Attacker's Goals

• An attacker can abuse Remote Procedure Calls to coerce authentication from servers.

Investigative actions

• Check for a suspicious process on the initiator.
• Check if the source host is a vulnerability scanner.
• Check for unusual connections from {actor_remote_ip} to other servers in the network.
• Check for logged-in users to {actor_remote_ip} and investigate their actions.
• Check for indicators of compromise on {actor_remote_ip}.

Variations

Possible authentication coercion from an unconstrained delegation server to a sensitive server

Synopsis

Field	Value
ATT&CK Tactic	Credential Access (TA0006)
ATT&CK Technique	Forced Authentication (T1187), Adversary-in-the-Middle: LLMNR/NBT-NS Poisoning and SMB Relay (T1557.001)
Severity	Medium

Description

An unusual Remote Procedure Call (RPC) was made towards a sensitive server, to potentially cause authentication coercion.

Attacker's Goals

• An attacker can abuse Remote Procedure Calls to coerce authentication from servers.

Investigative actions

• Check for a suspicious process on the initiator.
• Check if the source host is a vulnerability scanner.
• Check for unusual connections from {actor_remote_ip} to other servers in the network.
• Check for logged-in users to {actor_remote_ip} and investigate their actions.
• Check for indicators of compromise on {actor_remote_ip}.

Possible authentication coercion to a sensitive server

Synopsis

Field	Value
ATT&CK Tactic	Credential Access (TA0006)
ATT&CK Technique	Forced Authentication (T1187), Adversary-in-the-Middle: LLMNR/NBT-NS Poisoning and SMB Relay (T1557.001)
Severity	Low

Description

An unusual Remote Procedure Call (RPC) was made towards a sensitive server, to potentially cause authentication coercion.

Attacker's Goals

• An attacker can abuse Remote Procedure Calls to coerce authentication from servers.

Investigative actions

• Check for a suspicious process on the initiator.
• Check if the source host is a vulnerability scanner.
• Check for unusual connections from {actor_remote_ip} to other servers in the network.
• Check for logged-in users to {actor_remote_ip} and investigate their actions.
• Check for indicators of compromise on {actor_remote_ip}.