name: Windows PowerShell IIS Components WebGlobalModule Usage
id: 33fc9f6f-0ce7-4696-924e-a69ec61a3d57
version: 1
date: '2022-12-21'
author: Michael Haag, Splunk
type: Anomaly
datamodel: []
description: The following analytic identifies the usage of PowerShell Cmdlets - New-WebGlobalModule, Enable-WebGlobalModule and Set-WebGlobalModule being utilized to create (new), enable (start) or modify a current IIS Module.
  These commands are equivalent to AppCmd.exe parameters.
  Adversaries may utilize these cmdlets as they are lesser known and perform the same activity as AppCmd. 
search: '`powershell` EventCode=4104 ScriptBlockText IN("*New-WebGlobalModule*","*Enable-WebGlobalModule*","*Set-WebGlobalModule*")
  | stats count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText Computer user_id 
  | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)`  | `windows_powershell_iis_components_webglobalmodule_usage_filter`'
how_to_implement: To successfully implement this analytic, you will need to enable
  PowerShell Script Block Logging on some or all endpoints. Additional setup here
  https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
known_false_positives: It is possible administrators or scripts may run these commands, filtering may be required.
references:
  - https://learn.microsoft.com/en-us/powershell/module/webadministration/new-webglobalmodule?view=windowsserver2022-ps
  - 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.crowdstrike.com/wp-content/uploads/2022/05/crowdstrike-iceapple-a-novel-internet-information-services-post-exploitation-framework-1.pdf
  - https://unit42.paloaltonetworks.com/unit42-oilrig-uses-rgdoor-iis-backdoor-targets-middle-east/
  - https://www.secureworks.com/research/bronze-union
  - https://github.com/redcanaryco/atomic-red-team/tree/master/atomics/T1505.004
tags:
  analytic_story:
  - IIS Components
  asset_type: Endpoint
  cis20:
  - CIS 3
  - CIS 5
  - CIS 16
  confidence: 80
  context:
  - Source:Endpoint
  - Stage:Defense Evasion
  dataset:
  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1505.004/4104_windows-powershell.log
  impact: 80
  kill_chain_phases:
  - Installation
  message: A PowerShell Cmdlet related to enabling, creating or modifying a IIS module has occurred on $Computer$.
  mitre_attack_id:
  - T1505
  - T1505.004
  nist:
  - DE.CM
  observable:
  - name: Computer
    type: Hostname
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - ScriptBlockText
  - Computer
  - EventCode
  risk_score: 64
  security_domain: endpoint