ETW Logging/Processing Option Disabled On IIS Server — Sigma Rule

Rule metadata and linked tags

Author: frack113, Nasreddine Bencherchali. Source status: test; severity: medium. Source dates: 2024-10-06 / not supplied.

{
  "product": "windows",
  "service": "iis-configuration"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: b0baa94515b67bf02a8402e02920c98f2209e56ab9b099ac77a10717ee76f02d

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: ETW Logging/Processing Option Disabled On IIS Server
id: a5b40a90-baf5-4bf7-a6f7-373494881d22
status: test
description: Detects changes to of the IIS server configuration in order to disable/remove the ETW logging/processing option.
references:
    - 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://learn.microsoft.com/en-us/iis/configuration/system.applicationhost/sites/sitedefaults/logfile/
author: frack113, Nasreddine Bencherchali
date: 2024-10-06
tags:
    - attack.persistence
    - attack.defense-impairment
    - attack.t1685.001
    - attack.t1505.004
logsource:
    product: windows
    service: iis-configuration
detection:
    selection:
        EventID: 29
        Configuration|endswith: '@logTargetW3C'
        OldValue|contains: 'ETW'
    filter_main_etw_added:
        NewValue|contains: 'ETW'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Legitimate administrator activity
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate administrator activity

Source references

• 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://learn.microsoft.com/en-us/iis/configuration/system.applicationhost/sites/sitedefaults/logfile/