Firewall Disabled via Netsh

Detects netsh commands that turns off the Windows firewall

Rule Content

- title: Firewall Disabled via Netsh
  id: 57c4bf16-227f-4394-8ec7-1b745ee061c3
  description: Detects netsh commands that turns off the Windows firewall
  references:
  - https://www.winhelponline.com/blog/enable-and-disable-windows-firewall-quickly-using-command-line/
  - https://app.any.run/tasks/210244b9-0b6b-4a2c-83a3-04bd3175d017/
  date: 2019/11/01
  status: experimental
  author: Fatih Sirin
  tags:
  - attack.defense_evasion
  logsource:
    category: process_creation
    product: windows
    service: null
  detection:
    selection:
      CommandLine:
      - netsh firewall set opmode mode=disable
      - netsh advfirewall set * state off
    condition: selection
  falsepositives:
  - Legitimate administration
  level: medium

Querying Elasticsearch

Import Libraries



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from elasticsearch import Elasticsearch
from elasticsearch_dsl import Search
import pandas as pd

Initialize Elasticsearch client



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es = Elasticsearch(['http://helk-elasticsearch:9200'])
searchContext = Search(using=es, index='logs-*', doc_type='doc')

Run Elasticsearch Query



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s = searchContext.query('query_string', query='process_command_line.keyword:(netsh\ firewall\ set\ opmode\ mode\=disable OR netsh\ advfirewall\ set\ *\ state\ off)')
response = s.execute()
if response.success():
    df = pd.DataFrame((d.to_dict() for d in s.scan()))

Show Results



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df.head()