Elastic Security Detection Rules

Potential Protocol Tunneling via Yuze

Last updated 6 days ago on 2026-03-18
Created 6 days ago on 2026-03-18

About

Identifies execution of Yuze, a lightweight open-source tunneling tool used for intranet penetration. Yuze supports forward and reverse SOCKS5 proxy tunneling and is typically executed via rundll32 loading yuze.dll with the RunYuze export. Threat actors may use it to proxy C2 or pivot traffic.
Tags
Domain: EndpointOS: WindowsUse Case: Threat DetectionTactic: Command and ControlData Source: Elastic DefendData Source: SysmonData Source: SentinelOneData Source: Microsoft Defender for EndpointData Source: CrowdstrikeData Source: Elastic EndgameData Source: Windows Security Event LogsLanguage: eql
Severity
medium
Risk Score
47
MITRE ATT&CK™

Command and Control (TA0011)(external, opens in a new tab or window)

↳ Protocol Tunneling (T1572)(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.sysmon_operational-*winlogbeat-*
Related Integrations

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

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

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

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

system(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.args : "reverse" and process.args : ("-c", "-s")) or 
    (process.args : ("proxy", "fwd") and process.args : "-l") 
   ) and 
  (?process.code_signature.exists == false or process.name : "rundll32.exe")

Install detection rules in Elastic Security

Detect Potential Protocol Tunneling via Yuze 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).