- title: Suspicious access to sensitive file extensions
id: 91c945bc-2ad1-4799-a591-4d00198a1215
description: Detects known sensitive file extensions
author: Samir Bousseaden
tags:
- attack.collection
logsource:
product: windows
service: security
category: null
detection:
selection:
EventID:
- 5145
RelativeTargetName:
- '*.pst'
- '*.ost'
- '*.msg'
- '*.nst'
- '*.oab'
- '*.edb'
- '*.nsf'
- '*.bak'
- '*.dmp'
- '*.kirbi'
- '*\ntds.dit'
- '*\groups.xml'
- '*.rdp'
condition: selection
falsepositives:
- Help Desk operator doing backup or re-imaging end user machine or pentest or backup
software
level: high
In [ ]:
from elasticsearch import Elasticsearch
from elasticsearch_dsl import Search
import pandas as pd
In [ ]:
es = Elasticsearch(['http://helk-elasticsearch:9200'])
searchContext = Search(using=es, index='logs-endpoint-winevent-security-*', doc_type='doc')
In [ ]:
s = searchContext.query('query_string', query='(event_id:("5145") AND share_relative_target_name.keyword:(*.pst OR *.ost OR *.msg OR *.nst OR *.oab OR *.edb OR *.nsf OR *.bak OR *.dmp OR *.kirbi OR *\\ntds.dit OR *\\groups.xml OR *.rdp))')
response = s.execute()
if response.success():
df = pd.DataFrame((d.to_dict() for d in s.scan()))
In [ ]:
df.head()