Possible Execution of HH.EXE (via process_creation)

title: Possible Execution of HH.EXE (via process_creation)
id: 2a56e6b2-2591-54f4-9594-52d48554e0a4
status: stable
description: This rule detects the execution of "hh.exe" to open ".chm" files.
references:
    - https://attack.mitre.org/techniques/T1218/001/
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1218.001/T1218.001.md
    - https://eqllib.readthedocs.io/en/latest/analytics/b25aa548-7937-11e9-8f5c-d46d6d62a49e.html
    - https://www.zscaler.com/blogs/security-research/unintentional-leak-glimpse-attack-vectors-apt37
author: Huntrule Team
date: 2026-06-07
tags:
    - attack.stealth
    - attack.t1218.001
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - OriginalFileName: 'HH.exe'
        - Image|endswith: '\hh.exe'
    selection_cli:
        CommandLine|contains: '.chm'
    condition: all of selection_*
falsepositives:
    - Unknown
level: low
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_hh_chm_execution/info.yml