name: Disabling Firewall with Netsh
id: 6860a62c-9203-11eb-9e05-acde48001122
version: 2
date: '2021-03-31'
author: Teoderick Contreras, Splunk
status: production
type: Anomaly
description: This search is to identifies suspicious firewall disabling using netsh
  application. this technique is commonly seen in malware that tries to communicate
  or download its component or other payload to its C2 server.
data_source:
- Sysmon Event ID 1
search:
  selection1:
    OriginalFileName: netsh.exe
  selection2:
    Image|endswith: netsh.exe
  selection3:
    CommandLine: '*firewall*'
  selection4:
    CommandLine:
    - '*off*'
    - '*disable*'
  condition: (selection1 or selection2) and selection3 and selection4
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: admin may disable firewall during testing or fixing network
  problem.
references:
- https://tccontre.blogspot.com/2020/01/remcos-rat-evading-windows-defender-av.html
tags:
  analytic_story:
  - Windows Defense Evasion Tactics
  asset_type: Endpoint
  confidence: 50
  impact: 50
  message: The Windows Firewall was disabled on $dest$ by $user$.
  mitre_attack_id:
  - T1562.001
  - T1562
  observable:
  - name: user
    type: User
    role:
    - Victim
  - name: dest
    type: Hostname
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  risk_score: 25
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.001/win_app_defender_disabling/windows-security.log
    source: WinEventLog:Security
    sourcetype: WinEventLog
    update_timestamp: true
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.001/win_app_defender_disabling/windows-system.log
    source: WinEventLog:System
    sourcetype: WinEventLog
    update_timestamp: true
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.001/win_app_defender_disabling/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog