mirror of
https://github.com/splunk/security_content
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Bhavin Patel
69 lines
3.1 KiB
YAML
69 lines
3.1 KiB
YAML
name: Windows PowerShell IIS Components WebGlobalModule Usage
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id: 33fc9f6f-0ce7-4696-924e-a69ec61a3d57
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version: 2
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date: '2024-05-14'
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author: Michael Haag, Splunk
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status: production
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type: Anomaly
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description: The following analytic detects the usage of PowerShell Cmdlets - New-WebGlobalModule,
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Enable-WebGlobalModule, and Set-WebGlobalModule, which are used to create, enable,
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or modify IIS Modules. This detection leverages PowerShell Script Block Logging,
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specifically monitoring EventCode 4104 for these cmdlets. This activity is significant
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as adversaries may use these lesser-known cmdlets to manipulate IIS configurations,
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similar to AppCmd.exe, potentially bypassing traditional defenses. If confirmed
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malicious, this could allow attackers to persist in the environment, manipulate
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web server behavior, or escalate privileges.
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data_source:
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- Powershell Script Block Logging 4104
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search: '`powershell` EventCode=4104 ScriptBlockText IN("*New-WebGlobalModule*","*Enable-WebGlobalModule*","*Set-WebGlobalModule*")
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| stats count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText
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Computer user_id | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` |
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`windows_powershell_iis_components_webglobalmodule_usage_filter`'
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how_to_implement: To successfully implement this analytic, you will need to enable
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PowerShell Script Block Logging on some or all endpoints. Additional setup here
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https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
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known_false_positives: It is possible administrators or scripts may run these commands,
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filtering may be required.
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references:
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- https://learn.microsoft.com/en-us/powershell/module/webadministration/new-webglobalmodule?view=windowsserver2022-ps
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- https://www.microsoft.com/en-us/security/blog/2022/12/12/iis-modules-the-evolution-of-web-shells-and-how-to-detect-them/
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- https://www.crowdstrike.com/wp-content/uploads/2022/05/crowdstrike-iceapple-a-novel-internet-information-services-post-exploitation-framework-1.pdf
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- https://unit42.paloaltonetworks.com/unit42-oilrig-uses-rgdoor-iis-backdoor-targets-middle-east/
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- https://www.secureworks.com/research/bronze-union
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- https://github.com/redcanaryco/atomic-red-team/tree/master/atomics/T1505.004
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tags:
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analytic_story:
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- IIS Components
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asset_type: Endpoint
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confidence: 80
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impact: 80
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message: A PowerShell Cmdlet related to enabling, creating or modifying a IIS module
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has occurred on $Computer$.
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mitre_attack_id:
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- T1505
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- T1505.004
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observable:
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- name: Computer
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type: Hostname
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role:
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- Victim
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- ScriptBlockText
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- Computer
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- EventCode
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risk_score: 64
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1505.004/4104_windows-powershell.log
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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sourcetype: xmlwineventlog
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update_timestamp: true
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