Suspicious Execute Code with Pester.bat (via process_creation)

title: Suspicious Execute Code with Pester.bat (via process_creation)
id: 6a471662-bb70-50d2-92db-383a93079461
status: stable
description: This rule detects code execution via Pester.bat (Pester - Powershell Modulte for testing)
references:
    - https://attack.mitre.org/techniques/T1216/
    - https://attack.mitre.org/techniques/T1059/001/
    - https://twitter.com/Oddvarmoe/status/993383596244258816
    - https://github.com/api0cradle/LOLBAS/blob/d148d278f5f205ce67cfaf49afdfb68071c7252a/OSScripts/pester.md
author: Huntrule Team
date: 2026-01-30
tags:
    - attack.execution
    - attack.stealth
    - attack.t1059.001
    - attack.t1216
logsource:
    category: process_creation
    product: windows
detection:
    powershell_module:
        Image|endswith:
            - '\powershell.exe'
            - '\pwsh.exe'
        CommandLine|contains|all:
            - 'Pester'
            - 'Get-Help'
    cmd_execution:
        Image|endswith: '\cmd.exe'
        CommandLine|contains|all:
            - 'pester'
            - ';'
    get_help:
        CommandLine|contains:
            - 'help'
            - '\?'
    condition: powershell_module or (cmd_execution and get_help)
falsepositives:
    - Unknown
level: medium