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https://github.com/splunk/security_content
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pyth0n1c
77 lines
3.0 KiB
YAML
77 lines
3.0 KiB
YAML
name: Get-DomainTrust with PowerShell Script Block
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id: 89275e7e-0548-11ec-bf75-acde48001122
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version: 2
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date: '2022-05-02'
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author: Michael Haag, Splunk
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type: TTP
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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 suspicious PowerShell execution. Script Block Logging captures the command
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sent to PowerShell, the full command to be executed. Upon enabling, logs will output
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to Windows event logs. Dependent upon volume, enable on critical endpoints or all.
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\
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This analytic identifies Get-DomainTrust from PowerView in order to gather domain
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trust information. \
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During triage, review parallel processes using an EDR product or 4688 events. It
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will be important to understand the timeline of events around this activity. Review
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the entire logged PowerShell script block.'
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search: '`powershell` EventCode=4104 ScriptBlockText = "*get-domaintrust*" | stats count min(_time)
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as firstTime max(_time) as lastTime by Opcode Computer UserID EventCode ScriptBlockText | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `get_domaintrust_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: It is possible certain system management frameworks utilize
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this command to gather trust information.
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references:
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- https://blog.harmj0y.net/redteaming/a-guide-to-attacking-domain-trusts/
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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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- https://blog.palantir.com/tampering-with-windows-event-tracing-background-offense-and-defense-4be7ac62ac63
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- https://static1.squarespace.com/static/552092d5e4b0661088167e5c/t/59c1814829f18782e24f1fe2/1505853768977/Windows+PowerShell+Logging+Cheat+Sheet+ver+Sept+2017+v2.1.pdf
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- https://www.crowdstrike.com/blog/investigating-powershell-command-and-script-logging/
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tags:
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analytic_story:
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- Active Directory Discovery
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confidence: 40
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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/domaintrust.log
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impact: 30
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kill_chain_phases:
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- Reconnaissance
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message: Suspicious PowerShell Get-DomainTrust was identified on endpoint $Computer$
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by user $UserID$.
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mitre_attack_id:
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- T1482
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observable:
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- name: UserID
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type: User
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role:
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- Victim
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- name: Computer
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type: Hostname
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role:
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- Victim
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- name: parent_process_name
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type: Process
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role:
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- Parent Process
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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: 12
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security_domain: endpoint
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asset_type: Endpoint
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