sigmaDRL-1.1from SigmaHQ/sigma

Invoke-Obfuscation Obfuscated IEX Invocation - PowerShell Module

Detects all variations of obfuscated powershell IEX invocation code generated by Invoke-Obfuscation framework from the code block cited in the reference section below

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ATT&CK techniques

T1027 T1059.001

Rule sourcerules/windows/powershell/powershell_module/posh_pm_invoke_obfuscation_obfuscated_iex.yml

title: Invoke-Obfuscation Obfuscated IEX Invocation - PowerShell Module
id: 2f211361-7dce-442d-b78a-c04039677378
related:
    - id: 1b9dc62e-6e9e-42a3-8990-94d7a10007f7
      type: derived
status: test
description: Detects all variations of obfuscated powershell IEX invocation code generated by Invoke-Obfuscation framework from the code block cited in the reference section below
references:
    - https://github.com/danielbohannon/Invoke-Obfuscation/blob/f20e7f843edd0a3a7716736e9eddfa423395dd26/Out-ObfuscatedStringCommand.ps1#L873-L888
author: Daniel Bohannon (@Mandiant/@FireEye), oscd.community
date: 2019-11-08
modified: 2022-12-31
tags:
    - attack.defense-evasion
    - attack.t1027
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    category: ps_module
    definition: 0ad03ef1-f21b-4a79-8ce8-e6900c54b65b
detection:
    selection_payload:
        - Payload|re: '\$PSHome\[\s*\d{1,3}\s*\]\s*\+\s*\$PSHome\['
        - Payload|re: '\$ShellId\[\s*\d{1,3}\s*\]\s*\+\s*\$ShellId\['
        - Payload|re: '\$env:Public\[\s*\d{1,3}\s*\]\s*\+\s*\$env:Public\['
        - Payload|re: '\$env:ComSpec\[(\s*\d{1,3}\s*,){2}'
        - Payload|re: '\*mdr\*\W\s*\)\.Name'
        - Payload|re: '\$VerbosePreference\.ToString\('
        - Payload|re: '\[String\]\s*\$VerbosePreference'
    condition: selection_payload
falsepositives:
    - Unknown
level: high