Microsoft Binary Github Communication

Detects an executable in the Windows folder accessing github.com

Rule Content

- title: Microsoft Binary Github Communication
  id: 635dbb88-67b3-4b41-9ea5-a3af2dd88153
  status: experimental
  description: Detects an executable in the Windows folder accessing github.com
  references:
  - https://twitter.com/M_haggis/status/900741347035889665
  - https://twitter.com/M_haggis/status/1032799638213066752
  author: Michael Haag (idea), Florian Roth (rule)
  tags:
  - attack.lateral_movement
  - attack.t1105
  logsource:
    product: windows
    service: sysmon
    category: null
  detection:
    selection:
      EventID: 3
      Initiated: 'true'
      DestinationHostname:
      - '*.github.com'
      - '*.githubusercontent.com'
      Image: C:\Windows\\*
    condition: selection
  falsepositives:
  - Unknown
  - '@subTee in your network'
  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-sysmon-*', doc_type='doc')

Run Elasticsearch Query



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s = searchContext.query('query_string', query='(event_id:"3" AND network_initiated:"true" AND dst_host_name.keyword:(*.github.com OR *.githubusercontent.com) AND process_path.keyword:C\:\\Windows\\*)')
response = s.execute()
if response.success():
    df = pd.DataFrame((d.to_dict() for d in s.scan()))

Show Results



In [ ]:

    
df.head()