Suspicious Get-WmiObject

SIGMA detection rule by frack113 · NOASSERTION

The infrastructure for management data and operations that enables local and remote management of Windows personal computers and servers

title: Suspicious Get-WmiObject
id: 0332a266-b584-47b4-933d-a00b103e1b37
status: deprecated
description: The infrastructure for management data and operations that enables local and remote management of Windows personal computers and servers
references:
    - https://attack.mitre.org/datasources/DS0005/
    - https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.management/get-wmiobject?view=powershell-5.1&viewFallbackFrom=powershell-7
author: frack113
date: 2022/01/12
modified: 2023/12/11
tags:
    - attack.persistence
    - attack.t1546
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains:
            - 'Get-WmiObject'
            - 'gwmi'
    filter_cl_utility:
        Path|endswith: '\CL_Utility.ps1'
        ScriptBlockText|contains|all:
            - 'function Get-FreeSpace'
            - 'SELECT * FROM Win32_LogicalDisk WHERE MediaType=12'
    condition: selection and not 1 of filter_*
falsepositives:
    - Legitimate PowerShell scripts
level: low

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

69288d6f-4202-4703-8ff2-3083bcaf72ac

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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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Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

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What do these messages mean?

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

[[ currentRule.title ]]

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