MS Office Product Spawning Exe in User Dir

Detects an executable in the users directory started from Microsoft Word, Excel, Powerpoint, Publisher or Visio

Rule Content

- title: MS Office Product Spawning Exe in User Dir
  id: aa3a6f94-890e-4e22-b634-ffdfd54792cc
  status: experimental
  description: Detects an executable in the users directory started from Microsoft
    Word, Excel, Powerpoint, Publisher or Visio
  references:
  - sha256=23160972c6ae07f740800fa28e421a81d7c0ca5d5cab95bc082b4a986fbac57c
  - https://blog.morphisec.com/fin7-not-finished-morphisec-spots-new-campaign
  tags:
  - attack.execution
  - attack.defense_evasion
  - attack.t1059
  - attack.t1202
  - FIN7
  - car.2013-05-002
  author: Jason Lynch
  date: 2019/04/02
  logsource:
    category: process_creation
    product: windows
    service: null
  detection:
    selection:
      ParentImage:
      - '*\WINWORD.EXE'
      - '*\EXCEL.EXE'
      - '*\POWERPNT.exe'
      - '*\MSPUB.exe'
      - '*\VISIO.exe'
      - '*\OUTLOOK.EXE'
      Image:
      - C:\users\\*.exe
    condition: selection
  fields:
  - CommandLine
  - ParentCommandLine
  falsepositives:
  - unknown
  level: high

Querying Elasticsearch

Import Libraries



In [ ]:

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

Initialize Elasticsearch client



In [ ]:

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

Run Elasticsearch Query



In [ ]:

    
s = searchContext.query('query_string', query='(process_parent_path.keyword:(*\\WINWORD.EXE OR *\\EXCEL.EXE OR *\\POWERPNT.exe OR *\\MSPUB.exe OR *\\VISIO.exe OR *\\OUTLOOK.EXE) AND process_path.keyword:(C\:\\users\\*.exe))')
response = s.execute()
if response.success():
    df = pd.DataFrame((d.to_dict() for d in s.scan()))

Show Results



In [ ]:

    
df.head()