mirror of
https://github.com/splunk/security_content
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Michael Haag
58 lines
2.5 KiB
YAML
58 lines
2.5 KiB
YAML
name: Windows Enable PowerShell Web Access
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id: 175bb2de-6227-416b-9678-9b61999cd21f
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version: 1
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date: '2024-09-03'
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author: Michael Haag, Splunk
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data_sources:
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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: The following analytic detects the enabling of PowerShell Web Access via PowerShell commands. It leverages PowerShell script block logging (EventCode 4104) to identify the execution of the `Install-WindowsFeature` cmdlet with the `WindowsPowerShellWebAccess` parameter. This activity is significant because enabling PowerShell Web Access can facilitate remote execution of PowerShell commands, potentially allowing an attacker to gain unauthorized access to systems and networks.
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search: '`powershell` EventCode=4104 ScriptBlockText IN ("*Install-WindowsFeature*WindowsPowerShellWebAccess*","*Install-PswaWebApplication*","*Add-PswaAuthorizationRule*UserName *ComputerName *")
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| rename Computer as dest
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| stats count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText dest UserID
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| `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: 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 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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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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confidence: 80
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impact: 90
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message: PowerShell Web Access has been enabled on $dest$.
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mitre_attack_id:
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- T1059.001
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observable:
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- name: dest
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type: Endpoint
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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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- EventCode
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- ScriptBlockText
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- dest
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- UserID
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risk_score: 72
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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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