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
17detection:
18    selection:
19        cs-method: 'POST'
20        sc-status: 200
21        cs-uri-stem: '/ecp/DDI/DDIService.svc/SetObject'
22        cs-uri-query|contains|all:
23            - 'schema=Reset'
24            - 'VirtualDirectory'
25        cs-username|endswith: '$'
26    keywords:
27        '|all':
28            - 'POST'
29            - 200
30            - '/ecp/DDI/DDIService.svc/SetObject'
31            - 'schema=Reset'
32            - 'VirtualDirectory'
33            - '$'
34    condition: selection or keywords
35falsepositives:
36    - Unlikely
37level: critical