ETW Logging/Processing Option Disabled On IIS Server

calendar May 20, 2025 · attack.defense-evasion attack.persistence attack.t1562.002 attack.t1505.004  ·
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Detects changes to of the IIS server configuration in order to disable/remove the ETW logging/processing option.

Sigma rule (View on GitHub)

 1title: ETW Logging/Processing Option Disabled On IIS Server
 2id: a5b40a90-baf5-4bf7-a6f7-373494881d22
 3status: experimental
 4description: Detects changes to of the IIS server configuration in order to disable/remove the ETW logging/processing option.
 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://learn.microsoft.com/en-us/iis/configuration/system.applicationhost/sites/sitedefaults/logfile/
 9author: frack113, Nasreddine Bencherchali
10date: 2024-10-06
11tags:
12    - attack.defense-evasion
13    - attack.persistence
14    - attack.t1562.002
15    - attack.t1505.004
16logsource:
17    product: windows
18    service: iis-configuration
19detection:
20    selection:
21        EventID: 29
22        Configuration|endswith: '@logTargetW3C'
23        OldValue|contains: 'ETW'
24    filter_main_etw_added:
25        NewValue|contains: 'ETW'
26    condition: selection and not 1 of filter_main_*
27falsepositives:
28    - Legitimate administrator activity
29level: medium

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