HH.EXE Execution — Sigma Rule

Rule metadata and linked tags

Author: E.M. Anhaus (originally from Atomic Blue Detections, Dan Beavin), oscd.community. Source status: test; severity: low. Source dates: 2019-10-24 / 2023-12-11.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 80788d0b9ba4b120302d57df1e33451238e696bce1235aadaac1f2f548fb2cc5

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: HH.EXE Execution
id: 68c8acb4-1b60-4890-8e82-3ddf7a6dba84
status: test
description: Detects the execution of "hh.exe" to open ".chm" files.
references:
    - 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: E.M. Anhaus (originally from Atomic Blue Detections, Dan Beavin), oscd.community
date: 2019-10-24
modified: 2023-12-11
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:
    - False positives are expected with legitimate ".CHM"
level: low
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_hh_chm_execution/info.yml

Original YAML and metadata in JSON

False positives

• False positives are expected with legitimate ".CHM"

Source references

• 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