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mhaag-spl
58 lines
2.1 KiB
YAML
58 lines
2.1 KiB
YAML
name: GetNetTcpconnection with PowerShell Script Block
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id: 091712ff-b02a-4d43-82ed-34765515d95d
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version: 2
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date: '2022-04-02'
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author: Mauricio Velazco, Splunk
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type: Hunting
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datamodel: []
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description: The following analytic utilizes PowerShell Script Block Logging (EventCode=4104)
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to identify the execution of the `Get-NetTcpconnection ` commandlet. This commandlet
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is used to return a listing of network connections on a compromised system. Red
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Teams and adversaries alike may use this commandlet for situational awareness and
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Active Directory Discovery.
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search: '`powershell` EventCode=4104 (ScriptBlockText = "*Get-NetTcpconnection*") | stats
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count min(_time) as firstTime max(_time) as lastTime by Opcode Computer
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UserID EventCode ScriptBlockText | `security_content_ctime(firstTime)` | `getnettcpconnection_with_powershell_script_block_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: 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/T1049/
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- https://docs.microsoft.com/en-us/powershell/module/nettcpip/get-nettcpconnection?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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confidence: 50
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context:
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- Source:Endpoint
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- Stage:Discovery
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059.001/powershell_script_block_logging/nettcpconnection.log
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impact: 30
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kill_chain_phases:
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- Reconnaissance
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message: Network Connection discovery on $Computer$ by $user$
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mitre_attack_id:
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- T1049
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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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asset_type: Endpoint
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