title: Suspicious Scripting in a WMI Consumer
id: fe21810c-2a8c-478f-8dd3-5a287fb2a0e0
status: experimental
description: Detects suspicious scripting in WMI Event Consumers
author: Florian Roth, Jonhnathan Ribeiro
references:
    - https://in.security/an-intro-into-abusing-and-identifying-wmi-event-subscriptions-for-persistence/
    - https://github.com/Neo23x0/signature-base/blob/master/yara/gen_susp_lnk_files.yar#L19
    - https://github.com/RiccardoAncarani/LiquidSnake
date: 2019/04/15
modified: 2021/09/01
tags:
    - attack.t1086          # an old one
    - attack.execution
    - attack.t1059.005
logsource:
    product: windows
    category: wmi_event
detection:
    selection_destination:
        - Destination|contains|all:
              - 'new-object'
              - 'net.webclient'
              - '.downloadstring'
        - Destination|contains|all:
              - 'new-object'
              - 'net.webclient'
              - '.downloadfile'
        - Destination|contains:
              - ' iex('
              - 'WScript.shell'
              - ' -nop '
              - ' -noprofile '
              - ' -decode '
              - ' -enc '
        - Destination|contains:
              - 'WScript.Shell'
              - 'System.Security.Cryptography.FromBase64Transform'
    condition: selection_destination
fields:
    - User
    - Operation
falsepositives:
    - Administrative scripts
level: high
