sigmaDRL-1.1from SigmaHQ/sigma

Invoke-Obfuscation VAR+ Launcher - PowerShell

Detects Obfuscated use of Environment Variables to execute PowerShell

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FP risk

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ATT&CK techniques

T1027 T1059.001

Rule sourcerules/windows/powershell/powershell_script/posh_ps_invoke_obfuscation_var.yml

title: Invoke-Obfuscation VAR+ Launcher - PowerShell
id: 0adfbc14-0ed1-11eb-adc1-0242ac120002
status: test
description: Detects Obfuscated use of Environment Variables to execute PowerShell
references:
    - https://github.com/SigmaHQ/sigma/issues/1009  # (Task 24)
author: Jonathan Cheong, oscd.community
date: 2020-10-15
modified: 2024-04-05
tags:
    - attack.defense-evasion
    - attack.t1027
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection_4104:
        ScriptBlockText|re: 'cmd.{0,5}(?:/c|/r)(?:\s|)"set\s[a-zA-Z]{3,6}.*(?:\{\d\}){1,}\\"\s+?-f(?:.*\)){1,}.*"'
    condition: selection_4104
falsepositives:
    - Unknown
level: high