local_account_discovery_with_net.yml

name: Local Account Discovery with Net
id: 5d0d4830-0133-11ec-bae3-acde48001122
version: 3
date: '2024-05-29'
author: Mauricio Velazco, Splunk
status: production
type: Hunting
description: The following analytic detects the execution of `net.exe` or `net1.exe`
  with command-line arguments `user` or `users` to query local user accounts. It leverages
  data from Endpoint Detection and Response (EDR) agents, focusing on process names
  and command-line executions. This activity is significant as it indicates potential
  reconnaissance efforts by adversaries to enumerate local users, which is a common
  step in situational awareness and Active Directory discovery. If confirmed malicious,
  this behavior could lead to further attacks, including privilege escalation and
  lateral movement within the network.
data_source:
- Sysmon EventID 1
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
  as lastTime from datamodel=Endpoint.Processes where `process_net` (Processes.process=*user
  OR Processes.process=*users) 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)`
  | `local_account_discovery_with_net_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: Administrators or power users may use this command for troubleshooting.
references:
- https://attack.mitre.org/techniques/T1087/001/
tags:
  analytic_story:
  - Active Directory Discovery
  - Sandworm Tools
  asset_type: Endpoint
  confidence: 50
  impact: 30
  message: Local user discovery enumeration on $dest$ by $user$
  mitre_attack_id:
  - T1087
  - T1087.001
  observable:
  - name: dest
    type: Endpoint
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  risk_score: 15
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: 
      https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1087.001/AD_discovery/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog