Execution Of Script Located In Potentially Suspicious Directory (via process_creation)

title: Execution Of Script Located In Potentially Suspicious Directory (via process_creation)
id: 9930e7b5-c286-582e-92f3-c69c71584b92
status: stable
description: This rule detects executions of scripts located in potentially anomalous locations such as "/tmp" via a shell such as "bash", "sh", etc.
references:
    - https://blogs.jpcert.or.jp/en/2023/05/gobrat.html
    - https://jstnk9.github.io/jstnk9/research/GobRAT-Malware/
    - https://www.virustotal.com/gui/file/60bcd645450e4c846238cf0e7226dc40c84c96eba99f6b2cffcd0ab4a391c8b3/detection
    - https://www.virustotal.com/gui/file/3e44c807a25a56f4068b5b8186eee5002eed6f26d665a8b791c472ad154585d1/detection
author: Huntrule Team
date: 2026-01-21
tags:
    - attack.execution
    - attack.t1059.004
logsource:
    product: linux
    category: process_creation
detection:
    selection_img:
        Image|endswith:
            - '/bash'
            - '/csh'
            - '/dash'
            - '/fish'
            - '/ksh'
            - '/sh'
            - '/zsh'
    selection_flag:
        CommandLine|contains: ' -c '
    selection_paths:
        CommandLine|contains: '/tmp/'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium