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68 lines
2.9 KiB
YAML
68 lines
2.9 KiB
YAML
name: Recon Using WMI Class
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id: 018c1972-ca07-11eb-9473-acde48001122
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version: 1
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date: '2021-06-10'
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author: Teoderick Contreras, Splunk
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type: batch
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datamodel: []
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description: The following analytic identifies suspicious PowerShell via EventCode
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4104, where WMI is performing an event query looking for running processes or running
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services. This technique is commonly found where the adversary will identify services
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and system information on the compromised machine. During triage, review parallel
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processes within the same timeframe. Review the full script block to identify other
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related artifacts.
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search: '`powershell` EventCode=4104 (Message= "*SELECT*" OR Message= "*Get-WmiObject*")
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AND (Message= "*Win32_Bios*" OR Message= "*Win32_OperatingSystem*" OR Message= "*Win32_Processor*"
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OR Message= "*Win32_ComputerSystem*" OR Message= "*Win32_ComputerSystemProduct*"
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OR Message= "*Win32_ShadowCopy*") | stats count min(_time) as firstTime max(_time)
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as lastTime by EventCode Message ComputerName User | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `recon_using_wmi_class_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: network administrator may used this command for checking purposes
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references:
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- https://news.sophos.com/en-us/2020/05/12/maze-ransomware-1-year-counting/
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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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- Malicious PowerShell
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automated_detection_testing: passed
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confidence: 80
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context:
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- source:endpoint
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- stage: Reconnaissance
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/honeypots/pwsh/windows-powershell.log
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impact: 75
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kill_chain_phases:
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- Reconnaissance
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message: A suspicious powershell script contains host recon command in $Message$
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with EventCode $EventCode$ in host $ComputerName$
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mitre_attack_id:
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- T1592
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observable:
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- name: ComputerName
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type: Hostname
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role:
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- Victim
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- name: User
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type: User
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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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- Message
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- ComputerName
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- User
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risk_score: 60
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security_domain: endpoint
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