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https://github.com/splunk/security_content
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ljstella
74 lines
3.5 KiB
YAML
74 lines
3.5 KiB
YAML
name: Windows Enable PowerShell Web Access
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id: 175bb2de-6227-416b-9678-9b61999cd21f
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version: 7
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date: '2025-06-24'
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author: Michael Haag, Splunk
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data_source:
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- Powershell Script Block Logging 4104
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type: TTP
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status: production
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description:
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The following analytic detects the enabling of PowerShell Web Access
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via PowerShell commands. It leverages PowerShell script block logging (EventCode
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4104) to identify the execution of the `Install-WindowsFeature` cmdlet with the
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`WindowsPowerShellWebAccess` parameter. This activity is significant because enabling
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PowerShell Web Access can facilitate remote execution of PowerShell commands, potentially
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allowing an attacker to gain unauthorized access to systems and networks.
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search:
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'`powershell` EventCode=4104 ScriptBlockText IN ("*Install-WindowsFeature*WindowsPowerShellWebAccess*","*Install-PswaWebApplication*","*Add-PswaAuthorizationRule*UserName
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*ComputerName *") | fillnull | stats count min(_time) as firstTime max(_time) as
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lastTime by dest signature signature_id user_id vendor_product EventID Guid Opcode
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Name Path ProcessID ScriptBlockId ScriptBlockText | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `windows_enable_powershell_web_access_filter`'
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how_to_implement:
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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://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:
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It is possible that legitimate scripts or network administrators
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may enable PowerShell Web Access. Monitor and escalate as needed.
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references:
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- https://www.cisa.gov/news-events/cybersecurity-advisories/aa24-241a
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- https://gist.github.com/MHaggis/7e67b659af9148fa593cf2402edebb41
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drilldown_searches:
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- name: View the detection results for - "$dest$"
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search: '%original_detection_search% | search dest = "$dest$"'
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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 - "$dest$"
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search:
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'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$")
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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: PowerShell Web Access has been enabled 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: 72
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threat_objects: []
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tags:
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analytic_story:
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- CISA AA24-241A
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- Malicious PowerShell
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asset_type: Endpoint
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mitre_attack_id:
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- T1059.001
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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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cve: []
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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/T1059.001/powershell_script_block_logging/pswa_powershell.log
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sourcetype: XmlWinEventLog
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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