IIS Native-Code Module Command Line Installation

calendar Aug 12, 2024 · attack.persistence attack.t1505.003  ·
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Detects suspicious IIS native-code module installations via command line

Sigma rule (View on GitHub)

 1title: IIS Native-Code Module Command Line Installation
 2id: 9465ddf4-f9e4-4ebd-8d98-702df3a93239
 3status: test
 4description: Detects suspicious IIS native-code module installations via command line
 5references:
 6    - https://researchcenter.paloaltonetworks.com/2018/01/unit42-oilrig-uses-rgdoor-iis-backdoor-targets-middle-east/
 7    - https://www.microsoft.com/security/blog/2022/07/26/malicious-iis-extensions-quietly-open-persistent-backdoors-into-servers/
 8author: Florian Roth (Nextron Systems)
 9date: 2019-12-11
10modified: 2024-03-13
11tags:
12    - attack.persistence
13    - attack.t1505.003
14logsource:
15    category: process_creation
16    product: windows
17detection:
18    selection_img:
19        - Image|endswith: '\appcmd.exe'
20        - OriginalFileName: 'appcmd.exe'
21    selection_cli:
22        CommandLine|contains|all:
23            - 'install'
24            - 'module'
25        CommandLine|contains|windash: '-name:'
26    filter_iis_setup:
27        ParentImage: 'C:\Windows\System32\inetsrv\iissetup.exe'
28    condition: all of selection_* and not 1 of filter_*
29falsepositives:
30    - Unknown as it may vary from organisation to organisation how admins use to install IIS modules
31level: medium

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