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Description

The following analytic identifies headless browser activity accessing mockbin.org or mocky.io. Mockbin.org and mocky.io are web services that allow users to mock HTTP requests and responses. The detection is based on the presence of "–headless" and "–disable-gpu" command line arguments which are commonly used in headless browsing and the presence of mockbin.org or mocky.io in the process.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint
  • Last Updated: 2023-09-11
  • Author: Michael Haag, Splunk
  • ID: 94fc85a1-e55b-4265-95e1-4b66730e05c0

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1564.003 Hidden Window Defense Evasion
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 10
CVE 


1
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| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where (Processes.process="*--headless*" AND Processes.process="*--disable-gpu*" AND (Processes.process="*mockbin.org/*" OR Processes.process="*mocky.io/*")) by Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.process Processes.process_id Processes.parent_process_id 
| `drop_dm_object_name(Processes)` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `headless_browser_mockbin_or_mocky_request_filter`

Macros

The SPL above uses the following Macros:

:information_source: headless_browser_mockbin_or_mocky_request_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

  • Processes.dest
  • Processes.user
  • Processes.parent_process
  • Processes.process_name
  • Processes.process
  • Processes.process_id
  • Processes.parent_process_id

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 are not expected with this detection, unless within the organization there is a legitimate need for headless browsing accessing mockbin.org or mocky.io.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
56.0 80 70 Headless browser activity accessing mockbin.org or mocky.io detected on $dest$ by $user$.

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

source | version: 1