Suspicious Execution of Ruby Inline Command (via process_creation)

title: Suspicious Execution of Ruby Inline Command (via process_creation)
id: ce3350c4-6a72-5dff-be6b-53ef5189951b
status: stable
description: This rule detects execution of ruby using the "-e" flag. This is could be used as a way to launch a reverse shell or execute live ruby code.
references:
    - https://attack.mitre.org/techniques/T1059/
    - https://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet
    - https://www.revshells.com/
author: Huntrule Team
date: 2026-03-16
tags:
    - attack.execution
    - attack.t1059
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\ruby.exe'
        - OriginalFileName: 'ruby.exe'
    selection_cli:
        CommandLine|contains: ' -e'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium