Possible Ruby Reverse Shell (via process_creation)

title: Possible Ruby Reverse Shell (via process_creation)
id: e6459330-b109-567c-a8de-2ad77c5c2ea8
status: stable
description: This rule detects execution of ruby with the "-e" flag and calls to "socket" related functions. This could be an indication of a potential attempt to setup a reverse shell
references:
    - https://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet
    - https://www.revshells.com/
author: 'Huntrule Team'
date: 2026-05-10
tags:
    - attack.execution
    - attack.t1059
logsource:
    category: process_creation
    product: linux
detection:
    selection:
        Image|contains: 'ruby'
        CommandLine|contains|all:
            - ' -e'
            - 'rsocket'
            - 'TCPSocket'
        CommandLine|contains:
            - ' ash'
            - ' bash'
            - ' bsh'
            - ' csh'
            - ' ksh'
            - ' pdksh'
            - ' sh'
            - ' tcsh'
    condition: selection
falsepositives:
    - Unknown
level: medium