Elastic Security Detection Rules

Potential Local NTLM Relay via HTTP

Last updated 15 days ago on 2026-04-27
Created 4 years ago on 2022-04-30

About

Identifies attempts to coerce local NTLM authentication over HTTP through WebDAV named-pipe paths such as Print Spooler or SRVSVC. Adversaries can combine this primitive with relay tooling to elevate privileges.
Tags
Domain: EndpointOS: WindowsUse Case: Threat DetectionTactic: Credential AccessTactic: Defense EvasionData Source: Elastic EndgameData Source: Elastic DefendData Source: Windows Security Event LogsData Source: Microsoft Defender XDRData Source: SysmonData Source: SentinelOneData Source: CrowdstrikeLanguage: eql
Severity
high
Risk Score
73
MITRE ATT&CK™

Credential Access (TA0006)(external, opens in a new tab or window)

↳ Forced Authentication (T1187)(external, opens in a new tab or window)

↳ Exploitation for Credential Access (T1212)(external, opens in a new tab or window)

↳ Adversary-in-the-Middle (T1557)(external, opens in a new tab or window)

Defense Evasion (TA0005)(external, opens in a new tab or window)

↳ System Binary Proxy Execution (T1218)(external, opens in a new tab or window)

License
Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type
Event Correlation Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
endgame-*logs-crowdstrike.fdr*logs-endpoint.events.process-*logs-m365_defender.event-*logs-sentinel_one_cloud_funnel.*logs-system.security*logs-windows.forwarded*logs-windows.sysmon_operational-*winlogbeat-*
Related Integrations

endpoint(external, opens in a new tab or window)

windows(external, opens in a new tab or window)

system(external, opens in a new tab or window)

m365_defender(external, opens in a new tab or window)

sentinel_one_cloud_funnel(external, opens in a new tab or window)

crowdstrike(external, opens in a new tab or window)

Query
text code block:
process where host.os.type == "windows" and event.type == "start" and
  process.name : "rundll32.exe" and

  /* Rundll32 WbeDav Client  */
  process.args : ("?:\\Windows\\System32\\davclnt.dll,DavSetCookie", "?:\\Windows\\SysWOW64\\davclnt.dll,DavSetCookie") and

  /* Access to named pipe via http */
  process.args : ("http*/print/pipe/*", "http*/pipe/spoolss", "http*/pipe/srvsvc")

Install detection rules in Elastic Security

Detect Potential Local NTLM Relay via HTTP in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).