sigmalowHunting

Potential PowerShell Obfuscation Using Alias Cmdlets

Detects Set-Alias or New-Alias cmdlet usage. Which can be use as a mean to obfuscate PowerShell scripts

MITRE ATT&CK

defense-evasionexecution

Detection Query

selection:
  ScriptBlockText|contains:
    - "Set-Alias "
    - "New-Alias "
filter_main_cim:
  ScriptBlockText:
    - Set-Alias -Name ncms -Value New-CimSession -Option ReadOnly, AllScope
      -ErrorAction SilentlyContinue
    - Set-Alias -Name gcls -Value Get-CimClass -Option ReadOnly, AllScope
      -ErrorAction SilentlyContinue
    - Set-Alias -Name ncso -Value New-CimSessionOption -Option ReadOnly,
      AllScope -ErrorAction SilentlyContinue
    - Set-Alias -Name gcms -Value Get-CimSession -Option ReadOnly, AllScope
      -ErrorAction SilentlyContinue
    - Set-Alias -Name rcms -Value Remove-cimSession -Option ReadOnly, AllScope
      -ErrorAction SilentlyContinue
    - Set-Alias -Name rcie -Value Register-CimIndicationEvent -Option ReadOnly,
      AllScope -ErrorAction SilentlyContinue
    - Set-Alias -Name gcai -Value Get-CimAssociatedInstance -Option ReadOnly,
      AllScope -ErrorAction SilentlyContinue
    - Set-Alias -Name gcim -Value Get-CimInstance -Option ReadOnly, AllScope
      -ErrorAction SilentlyContinue
    - Set-Alias -Name scim -Value Set-CimInstance -Option ReadOnly, AllScope
      -ErrorAction SilentlyContinue
    - Set-Alias -Name ncim -Value New-CimInstance -Option ReadOnly, AllScope
      -ErrorAction SilentlyContinue
    - Set-Alias -Name rcim -Value Remove-cimInstance -Option ReadOnly, AllScope
      -ErrorAction SilentlyContinue
    - Set-Alias -Name icim -Value Invoke-CimMethod -Option ReadOnly, AllScope
      -ErrorAction SilentlyContinue
condition: selection and not 1 of filter_main_*

Author

frack113

Created

2023-01-08

Data Sources

windowsps_script

Platforms

windows

References

https://github.com/1337Rin/Swag-PSO

Tags

attack.defense-evasionattack.executionattack.t1027attack.t1059.001

Raw Content

title: Potential PowerShell Obfuscation Using Alias Cmdlets
id: 96cd126d-f970-49c4-848a-da3a09f55c55
related:
    - id: e8314f79-564d-4f79-bc13-fbc0bf2660d8
      type: derived
status: test
description: Detects Set-Alias or New-Alias cmdlet usage. Which can be use as a mean to obfuscate PowerShell scripts
references:
    - https://github.com/1337Rin/Swag-PSO
author: frack113
date: 2023-01-08
modified: 2025-10-22
tags:
    - attack.defense-evasion
    - attack.execution
    - attack.t1027
    - attack.t1059.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains:
            - 'Set-Alias '
            - 'New-Alias '
    filter_main_cim:
        ScriptBlockText:
            - 'Set-Alias -Name ncms -Value New-CimSession -Option ReadOnly, AllScope -ErrorAction SilentlyContinue'
            - 'Set-Alias -Name gcls -Value Get-CimClass -Option ReadOnly, AllScope -ErrorAction SilentlyContinue'
            - 'Set-Alias -Name ncso -Value New-CimSessionOption -Option ReadOnly, AllScope -ErrorAction SilentlyContinue'
            - 'Set-Alias -Name gcms -Value Get-CimSession -Option ReadOnly, AllScope -ErrorAction SilentlyContinue'
            - 'Set-Alias -Name rcms -Value Remove-cimSession -Option ReadOnly, AllScope -ErrorAction SilentlyContinue'
            - 'Set-Alias -Name rcie -Value Register-CimIndicationEvent -Option ReadOnly, AllScope -ErrorAction SilentlyContinue'
            - 'Set-Alias -Name gcai -Value Get-CimAssociatedInstance -Option ReadOnly, AllScope -ErrorAction SilentlyContinue'
            - 'Set-Alias -Name gcim -Value Get-CimInstance -Option ReadOnly, AllScope -ErrorAction SilentlyContinue'
            - 'Set-Alias -Name scim -Value Set-CimInstance -Option ReadOnly, AllScope -ErrorAction SilentlyContinue'
            - 'Set-Alias -Name ncim -Value New-CimInstance -Option ReadOnly, AllScope -ErrorAction SilentlyContinue'
            - 'Set-Alias -Name rcim -Value Remove-cimInstance -Option ReadOnly, AllScope -ErrorAction SilentlyContinue'
            - 'Set-Alias -Name icim -Value Invoke-CimMethod -Option ReadOnly, AllScope -ErrorAction SilentlyContinue'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: low