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P4T12ICK
63 lines
1.9 KiB
YAML
63 lines
1.9 KiB
YAML
name: Malicious PowerShell Process With Obfuscation Techniques
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id: cde75cf6-3c7a-4dd6-af01-27cdb4511fd4
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version: 5
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date: '2021-01-19'
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author: David Dorsey, Splunk
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status: production
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type: TTP
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description: This search looks for PowerShell processes launched with arguments that
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have characters indicative of obfuscation on the command-line.
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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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OriginalFileName: pwsh.dll
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selection2:
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Image|endswith:
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- pwsh.exe
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- sqlps.exe
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- sqltoolsps.exe
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- powershell.exe
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- powershell_ise.exe
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selection3:
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OriginalFileName: PowerShell.EXE
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selection4:
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OriginalFileName: powershell_ise.EXE
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condition: (selection1 or selection2 or selection3 or selection4)
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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known_false_positives: These characters might be legitimately on the command-line,
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but it is not common.
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references: []
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tags:
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analytic_story:
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- Hermetic Wiper
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- Malicious PowerShell
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asset_type: Endpoint
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confidence: 60
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impact: 70
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message: Powershell.exe running with potential obfuscated arguments on $dest$
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mitre_attack_id:
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- T1059
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- T1059.001
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observable:
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- name: dest
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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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risk_score: 42
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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/obfuscated_powershell/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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