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52 lines
2.5 KiB
YAML
52 lines
2.5 KiB
YAML
name: GetAdComputer with PowerShell Script Block
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id: a9a1da02-8e27-4bf7-a348-f4389c9da487
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version: 5
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date: '2024-10-17'
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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: The following analytic detects the execution of the `Get-AdComputer` PowerShell commandlet using PowerShell Script Block Logging (EventCode=4104). This detection leverages script block text to identify when this commandlet is run. The `Get-AdComputer` commandlet is significant as it can be used by adversaries to enumerate all domain computers, aiding in situational awareness and Active Directory discovery. If confirmed malicious, this activity could allow attackers to map the network, identify targets, and plan further attacks, potentially leading to unauthorized access and data exfiltration.
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data_source:
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- Powershell Script Block Logging 4104
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search: '`powershell` EventCode=4104 (ScriptBlockText = "*Get-AdComputer*") | stats count min(_time) as firstTime max(_time) as lastTime by Opcode Computer UserID EventCode ScriptBlockText | `security_content_ctime(firstTime)` | `getadcomputer_with_powershell_script_block_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://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
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known_false_positives: Administrators or power users may use this PowerShell commandlet 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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- Gozi Malware
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asset_type: Endpoint
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confidence: 50
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impact: 30
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message: Remote system discovery enumeration on $Computer$ by $UserID$
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mitre_attack_id:
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- T1018
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observable:
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- name: Computer
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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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- ScriptBlockText
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- Opcode
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- Computer
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- UserID
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- EventCode
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risk_score: 15
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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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