password_policy_discovery_with_net.yml

name: Password Policy Discovery with Net
id: 09336538-065a-11ec-8665-acde48001122
version: 3
date: '2024-08-15'
author: Teoderick Contreras, Mauricio Velazco, Splunk
status: production
type: Hunting
description: The following analytic identifies the execution of `net.exe` or `net1.exe`
  with command line arguments aimed at obtaining the domain password policy. 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 gather information about Active Directory
  password policies. If confirmed malicious, this behavior could allow attackers to
  understand password complexity requirements, aiding in brute-force or password-guessing
  attacks, ultimately compromising user accounts and gaining unauthorized access to
  the network.
data_source:
- Sysmon EventID 1
- Windows Event Log Security 4688
- CrowdStrike ProcessRollup2
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
  as lastTime from datamodel=Endpoint.Processes where (Processes.process_name="net.exe"
  OR Processes.process_name="net1.exe") AND Processes.process = "*accounts*" AND Processes.process
  = "*/domain*" by Processes.dest Processes.user Processes.parent_process Processes.process_name
  Processes.process Processes.process_id Processes.parent_process_id Processes.parent_process_name
  | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
  | `password_policy_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://github.com/S1ckB0y1337/Active-Directory-Exploitation-Cheat-Sheet
tags:
  analytic_story:
  - Active Directory Discovery
  asset_type: Endpoint
  confidence: 30
  impact: 30
  message: an instance of process $process_name$ with commandline $process$ in $dest$
  mitre_attack_id:
  - T1201
  observable:
  - name: user
    type: User
    role:
    - Victim
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: parent_process_name
    type: Process
    role:
    - Attacker
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - Processes.dest
  - Processes.user
  - Processes.parent_process
  - Processes.process_name
  - Processes.process
  - Processes.process_id
  - Processes.parent_process_id
  - Processes.parent_process_name
  risk_score: 9
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: 
      https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1201/pwd_policy_discovery/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog