Suspicious PowerShell Invocations - Generic

Detects suspicious PowerShell invocation command parameters

Rule Content

- title: Suspicious PowerShell Invocations - Generic
  id: 3d304fda-78aa-43ed-975c-d740798a49c1
  status: experimental
  description: Detects suspicious PowerShell invocation command parameters
  tags:
  - attack.execution
  - attack.t1086
  author: Florian Roth (rule)
  logsource:
    product: windows
    service: powershell
    category: null
  detection:
    encoded:
    - ' -enc '
    - ' -EncodedCommand '
    hidden:
    - ' -w hidden '
    - ' -window hidden '
    - ' - windowstyle hidden '
    noninteractive:
    - ' -noni '
    - ' -noninteractive '
    condition: all of them
  falsepositives:
  - Penetration tests
  - Very special / sneaky PowerShell scripts
  level: high

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-endpoint-winevent-powershell-*', doc_type='doc')

Run Elasticsearch Query



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s = searchContext.query('query_string', query='(\*.keyword:(*\ \-enc\ * OR *\ \-EncodedCommand\ *) AND \*.keyword:(*\ \-w\ hidden\ * OR *\ \-window\ hidden\ * OR *\ \-\ windowstyle\ hidden\ *) AND \*.keyword:(*\ \-noni\ * OR *\ \-noninteractive\ *))')
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()