title: Invoke-Obfuscation VAR+ Launcher
author: Jonathan Cheong, oscd.community
date: 2020/10/15
description: Detects Obfuscated use of Environment Variables to execute PowerShell
detection:
    SELECTION_1:
        EventID: 1
    SELECTION_2:
        CommandLine|re: .*cmd.{0,5}(?:\/c|\/r)(?:\s|)\"set\s[a-zA-Z]{3,6}.*(?:\{\d\}){1,}\\\"\s+?\-f(?:.*\)){1,}.*\"
    condition: (SELECTION_1 and SELECTION_2)
falsepositives:
- Unknown
id: 27aec9c9-dbb0-4939-8422-1742242471d0
level: high
logsource:
    category: process_creation
    product: windows
references:
- https://github.com/Neo23x0/sigma/issues/1009
status: experimental
tags:
- attack.defense_evasion
- attack.t1027
- attack.execution
- attack.t1059.001
yml_filename: win_invoke_obfuscation_var.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation