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https://github.com/splunk/security_content
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ljstella
54 lines
2.4 KiB
YAML
54 lines
2.4 KiB
YAML
name: GetAdComputer with PowerShell Script Block
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id: a9a1da02-8e27-4bf7-a348-f4389c9da487
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version: 9
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date: '2025-06-24'
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author: Mauricio Velazco, Splunk
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status: production
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type: Hunting
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description:
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The following analytic detects the execution of the `Get-AdComputer`
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PowerShell commandlet using PowerShell Script Block Logging (EventCode=4104). This
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detection leverages script block text to identify when this commandlet is run. The
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`Get-AdComputer` commandlet is significant as it can be used by adversaries to enumerate
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all domain computers, aiding in situational awareness and Active Directory discovery.
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If confirmed malicious, this activity could allow attackers to map the network,
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identify targets, and plan further attacks, potentially leading to unauthorized
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access and data exfiltration.
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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 = "*Get-AdComputer*") | fillnull
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| stats count min(_time) as firstTime max(_time) as lastTime by dest signature signature_id
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user_id vendor_product EventID Guid Opcode Name Path ProcessID ScriptBlockId ScriptBlockText
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| `security_content_ctime(firstTime)` | `getadcomputer_with_powershell_script_block_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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Administrators or power users may use this PowerShell commandlet
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for troubleshooting.
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references:
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- https://attack.mitre.org/techniques/T1018/
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- https://docs.microsoft.com/en-us/powershell/module/activedirectory/get-adgroup?view=windowsserver2019-ps
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tags:
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analytic_story:
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- Active Directory Discovery
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- CISA AA22-320A
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- Medusa Ransomware
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- Gozi Malware
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asset_type: Endpoint
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mitre_attack_id:
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- T1018
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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/T1059.001/powershell_script_block_logging/sbl_xml.log
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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sourcetype: XmlWinEventLog
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