Previously Installed IIS Module Was Removed

calendar Oct 6, 2024 · attack.defense-evasion attack.persistence attack.t1562.002 attack.t1505.004  ·
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Detects the removal of a previously installed IIS module.

Sigma rule (View on GitHub)

 1title: Previously Installed IIS Module Was Removed
 2id: 9e1a1fdf-ee58-40ce-8e15-b66ca5a80e1f
 3status: experimental
 4description: Detects the removal of a previously installed IIS module.
 5references:
 6    - https://learn.microsoft.com/en-us/iis/manage/provisioning-and-managing-iis/configure-logging-in-iis
 7    - https://www.microsoft.com/en-us/security/blog/2022/12/12/iis-modules-the-evolution-of-web-shells-and-how-to-detect-them/
 8    - https://www.microsoft.com/en-us/security/blog/2022/07/26/malicious-iis-extensions-quietly-open-persistent-backdoors-into-servers/
 9    - https://learn.microsoft.com/en-us/iis/get-started/introduction-to-iis/iis-modules-overview
10author: Nasreddine Bencherchali
11date: 2024-10-06
12tags:
13    - attack.defense-evasion
14    - attack.persistence
15    - attack.t1562.002
16    - attack.t1505.004
17logsource:
18    product: windows
19    service: iis-configuration
20detection:
21    selection:
22        EventID: 29
23        Configuration|contains: '/system.webServer/modules/remove'
24    condition: selection
25falsepositives:
26    - Legitimate administrator activity
27# Note: Upgrade after an initial baseline
28level: low

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