mirror of
https://github.com/splunk/security_content
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Eric McGinnis
67 lines
4.2 KiB
YAML
67 lines
4.2 KiB
YAML
name: Windows PowerShell IIS Components WebGlobalModule Usage
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id: 33fc9f6f-0ce7-4696-924e-a69ec61a3d57
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version: 13
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creation_date: '2022-12-21'
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modification_date: '2026-05-13'
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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, Enable-WebGlobalModule, and Set-WebGlobalModule, which are used to create, enable, or modify IIS Modules. This detection leverages PowerShell Script Block Logging, specifically monitoring EventCode 4104 for these cmdlets. This activity is significant as adversaries may use these lesser-known cmdlets to manipulate IIS configurations, similar to AppCmd.exe, potentially bypassing traditional defenses. If confirmed malicious, this could allow attackers to persist in the environment, manipulate 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: |-
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`powershell` EventCode=4104 ScriptBlockText IN("*New-WebGlobalModule*","*Enable-WebGlobalModule*","*Set-WebGlobalModule*")
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| fillnull
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| stats count min(_time) as firstTime max(_time) as lastTime
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BY dest signature signature_id
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user_id vendor_product EventID
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Guid Opcode Name
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Path ProcessID ScriptBlockId
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ScriptBlockText
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| `security_content_ctime(firstTime)`
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| `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 PowerShell Script Block Logging on some or all endpoints. Additional setup here https://help.splunk.com/en/security-offerings/splunk-user-behavior-analytics/get-data-in/5.4.1/add-other-data-to-splunk-uba/configure-powershell-logging-to-see-powershell-anomalies-in-splunk-uba.
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known_false_positives: It is possible administrators or scripts may run these commands, 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 ("$Computer$") | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
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earliest_offset: 7d
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latest_offset: "0"
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intermediate_findings:
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entities:
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- field: dest
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type: system
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score: 20
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message: A PowerShell Cmdlet related to enabling, creating or modifying a IIS module has occurred on $dest$.
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analytic_story:
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- GhostRedirector IIS Module and Rungan Backdoor
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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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category: endpoint
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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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test_type: unit
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