ProxyLogon Reset Virtual Directories Based On IIS Log

 1title: ProxyLogon Reset Virtual Directories Based On IIS Log
 2id: effee1f6-a932-4297-a81f-acb44064fa3a
 3status: test
 4description: When exploiting this vulnerability with CVE-2021-26858, an SSRF attack is used to manipulate virtual directories
 5references:
 6    - https://bi-zone.medium.com/hunting-down-ms-exchange-attacks-part-1-proxylogon-cve-2021-26855-26858-27065-26857-6e885c5f197c
 7author: frack113
 8date: 2021-08-10
 9modified: 2023-05-08
10tags:
11    - cve.2021-26858
12    - detection.emerging-threats
13    - attack.initial-access
14    - attack.t1190
15logsource:
16    category: webserver
17    definition: 'Requirements: The POST request body data must be collected in order to make use of this detection'
18detection:
19    selection:
20        cs-method: 'POST'
21        sc-status: 200
22        cs-uri-stem: '/ecp/DDI/DDIService.svc/SetObject'
23        cs-uri-query|contains|all:
24            - 'schema=Reset'
25            - 'VirtualDirectory'
26        cs-username|endswith: '$'
27    keywords:
28        '|all':
29            - 'POST'
30            - 200
31            - '/ecp/DDI/DDIService.svc/SetObject'
32            - 'schema=Reset'
33            - 'VirtualDirectory'
34            - '$'
35    condition: selection or keywords
36falsepositives:
37    - Unlikely
38level: critical