posh_ps_susp_invocation_specific.yml

title: Suspicious PowerShell Invocations - Specific
id: ae7fbf8e-f3cb-49fd-8db4-5f3bed522c71
related:
    - id: fce5f582-cc00-41e1-941a-c6fabf0fdb8c
      type: obsoletes
    - id: 8ff28fdd-e2fa-4dfa-aeda-ef3d61c62090
      type: similar
    - id: 536e2947-3729-478c-9903-745aaffe60d2
      type: similar
status: test
description: Detects suspicious PowerShell invocation command parameters
references:
    - Internal Research
author: Florian Roth (Nextron Systems), Jonhnathan Ribeiro
date: 2017/03/05
modified: 2023/01/05
tags:
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection_convert_b64:
        ScriptBlockText|contains|all:
            - '-nop'
            - ' -w '
            - 'hidden'
            - ' -c '
            - '[Convert]::FromBase64String'
    selection_iex_selection:
        ScriptBlockText|contains|all:
            - ' -w '
            - 'hidden'
            - '-noni'
            - '-nop'
            - ' -c '
            - 'iex'
            - 'New-Object'
    selection_enc_selection:
        ScriptBlockText|contains|all:
            - ' -w '
            - 'hidden'
            - '-ep'
            - 'bypass'
            - '-Enc'
    selection_reg_selection:
        ScriptBlockText|contains|all:
            - 'powershell'
            - 'reg'
            - 'add'
            - 'HKCU\software\microsoft\windows\currentversion\run'
    selection_webclient_selection:
        ScriptBlockText|contains|all:
            - 'bypass'
            - '-noprofile'
            - '-windowstyle'
            - 'hidden'
            - 'new-object'
            - 'system.net.webclient'
            - '.download'
    selection_iex_webclient:
        ScriptBlockText|contains|all:
            - 'iex'
            - 'New-Object'
            - 'Net.WebClient'
            - '.Download'
    filter_chocolatey:
        ScriptBlockText|contains:
            - "(New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1"
            - "(New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1')"
            - 'Write-ChocolateyWarning'
    condition: 1 of selection_* and not 1 of filter_*
falsepositives:
    - Unknown
level: high