Suspicious Encoded Scripts in a WMI Consumer

SIGMA detection rule by Florian Roth (Nextron Systems) · NOASSERTION

Detects suspicious encoded payloads in WMI Event Consumers

title: Suspicious Encoded Scripts in a WMI Consumer
id: 83844185-1c5b-45bc-bcf3-b5bf3084ca5b
status: test
description: Detects suspicious encoded payloads in WMI Event Consumers
references:
    - https://github.com/RiccardoAncarani/LiquidSnake
author: Florian Roth (Nextron Systems)
date: 2021-09-01
modified: 2022-10-09
tags:
    - attack.privilege-escalation
    - attack.execution
    - attack.t1047
    - attack.persistence
    - attack.t1546.003
logsource:
    product: windows
    category: wmi_event
detection:
    selection_destination:
        Destination|base64offset|contains:
            - 'WriteProcessMemory'
            - 'This program cannot be run in DOS mode'
            - 'This program must be run under Win32'
    condition: selection_destination
falsepositives:
    - Unknown
level: high

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

574d80af-9c2f-4342-9e3a-1d788de0867d

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

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[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

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