mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Gowthamaraj rajendran
90 lines
3.5 KiB
YAML
90 lines
3.5 KiB
YAML
name: Windows Ngrok Reverse Proxy Usage
|
|
id: e2549f2c-0aef-408a-b0c1-e0f270623436
|
|
version: 2
|
|
date: '2023-01-12'
|
|
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 recently it has
|
|
become an adversary tool.
|
|
data_source:
|
|
- Sysmon Event ID 1
|
|
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
|
|
as lastTime from datamodel=Endpoint.Processes where Processes.process_name=ngrok.exe
|
|
Processes.process IN ("*start*", "*--config*","*http*","*authtoken*", "*http*",
|
|
"*tcp*") by Processes.dest Processes.user Processes.parent_process_name Processes.process_name
|
|
Processes.original_file_name Processes.process Processes.process_id Processes.parent_process_id
|
|
| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`|
|
|
`windows_ngrok_reverse_proxy_usage_filter`'
|
|
how_to_implement: The detection is based on data that originates from Endpoint Detection
|
|
and Response (EDR) agents. These agents are designed to provide security-related
|
|
telemetry from the endpoints where the agent is installed. To implement this search,
|
|
you must ingest logs that contain the process GUID, process name, and parent process.
|
|
Additionally, you must ingest complete command-line executions. These logs must
|
|
be processed using the appropriate Splunk Technology Add-ons that are specific to
|
|
the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
|
|
data model. Use the Splunk Common Information Model (CIM) to normalize the field
|
|
names and speed up the data modeling process.
|
|
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
|
|
required_fields:
|
|
- Processes.dest
|
|
- Processes.user
|
|
- Processes.parent_process_name
|
|
- Processes.parent_process
|
|
- Processes.original_file_name
|
|
- Processes.process_name
|
|
- Processes.process
|
|
- Processes.process_id
|
|
- Processes.parent_process_path
|
|
- Processes.process_path
|
|
- Processes.parent_process_id
|
|
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
|