Detection rules › Sigma
Webserver IIS configuration edited (SYSMON)
Detects scenarios where an attacker attempts to edit IIS configuration file in order to load a module.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1505.004 Server Software Component: IIS Components |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 11 | FileCreate |
Rule body yaml
title: Webserver IIS configuration edited (SYSMON)
description: Detects scenarios where an attacker attempts to edit IIS configuration file in order to load a module.
requirements: requires to update SYSMON configuration to include the IIS application path.
references:
- https://www.microsoft.com/security/blog/2022/07/26/malicious-iis-extensions-quietly-open-persistent-backdoors-into-servers/
- https://docs.microsoft.com/en-us/iis/get-started/planning-your-iis-architecture/introduction-to-applicationhostconfig
tags:
- attack.persistence
- attack.t1505.004
author: mdecrevoisier
status: experimental
logsource:
product: windows
category: file_event
detection:
selection:
EventID: 11
TargetFilename|endswith: '\inetsrv\config\applicationHost.config'
condition: selection
falsepositives:
- rare administrator change
level: high
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
EventID: 11
TargetFilename|endswith: '\inetsrv\config\applicationHost.config'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
TargetFilename | ends_with |
|