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Eric
74 lines
3.9 KiB
YAML
74 lines
3.9 KiB
YAML
name: Windows PowerShell IIS Components WebGlobalModule Usage
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id: 33fc9f6f-0ce7-4696-924e-a69ec61a3d57
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version: 7
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date: '2025-05-02'
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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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signature signature_id user_id vendor_product EventID Guid Opcode Name Path ProcessID
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ScriptBlockId ScriptBlockText | `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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drilldown_searches:
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- name: View the detection results for - "$Computer$"
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search: '%original_detection_search% | search Computer = "$Computer$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$Computer$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$Computer$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: A PowerShell Cmdlet related to enabling, creating or modifying a IIS module
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has occurred on $dest$.
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risk_objects:
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- field: dest
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type: system
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score: 64
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threat_objects: []
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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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mitre_attack_id:
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- T1505.004
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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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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: 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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