name: Windows Ngrok Reverse Proxy Usage
id: e2549f2c-0aef-408a-b0c1-e0f270623436
version: 1
date: '2022-11-16'
author: Michael Haag, Splunk
status: production
type: Anomaly
description: The following analytic identifies the use of ngrok.exe being utilized
  on the Windows operating system. Unfortunately, there is no original file name for
  Ngrok, so it may be worth an additional hunt to identify any command-line arguments.
  The sign of someone using Ngrok is not malicious, however, more recenctly it has
  become an adversary tool.
data_source:
- Sysmon Event ID 1
search:
  selection1:
    CommandLine:
    - '*start*'
    - '*--config*'
    - '*http*'
    - '*authtoken*'
    - '*http*'
    - (*tcp*
    Image|endswith: ngrok.exe
  condition: selection1
how_to_implement: To successfully implement this search you need to be ingesting information
  on process that include the name of the process responsible for the changes from
  your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
  confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
  endpoint product.
known_false_positives: False positives will be present based on organizations that
  allow the use of Ngrok. Filter or monitor as needed.
references:
- https://www.cisa.gov/uscert/sites/default/files/publications/aa22-320a_joint_csa_iranian_government-sponsored_apt_actors_compromise_federal%20network_deploy_crypto%20miner_credential_harvester.pdf
tags:
  analytic_story:
  - Reverse Network Proxy
  - CISA AA22-320A
  asset_type: Endpoint
  confidence: 100
  impact: 50
  message: A reverse proxy was identified spawning from $parent_process_name$ -  $process_name$
    on endpoint $dest$ by user $user$.
  mitre_attack_id:
  - T1572
  - T1090
  - T1102
  observable:
  - name: user
    type: User
    role:
    - Victim
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: parent_process_name
    type: Process
    role:
    - Parent Process
  - name: process_name
    type: Process
    role:
    - Child Process
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  risk_score: 50
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1572/ngrok/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog
    update_timestamp: true