Possible Removal of Previously Installed IIS Module Was (via iis-configuration)

title: Possible Removal of Previously Installed IIS Module Was (via iis-configuration)
id: 296a12f4-625f-5f4e-87dd-be99a0b6cefa
status: stable
description: This rule detects the removal of a previously installed IIS module.
references:
    - https://attack.mitre.org/techniques/T1505/004/
    - https://attack.mitre.org/techniques/T1685/001/
    - https://learn.microsoft.com/en-us/iis/manage/provisioning-and-managing-iis/configure-logging-in-iis
    - https://www.microsoft.com/en-us/security/blog/2022/12/12/iis-modules-the-evolution-of-web-shells-and-how-to-detect-them/
    - https://www.microsoft.com/en-us/security/blog/2022/07/26/malicious-iis-extensions-quietly-open-persistent-backdoors-into-servers/
    - https://learn.microsoft.com/en-us/iis/get-started/introduction-to-iis/iis-modules-overview
author: Huntrule Team
date: 2026-06-05
tags:
    - attack.persistence
    - attack.defense-impairment
    - attack.t1685.001
    - attack.t1505.004
logsource:
    product: windows
    service: iis-configuration
detection:
    selection:
        EventID: 29
        Configuration|contains: '/system.webServer/modules/remove'
    condition: selection
falsepositives:
    - Unknown
level: low