Possible Homoglyph Attack Via Lookalike Characters (via process_creation)

title: Possible Homoglyph Attack Via Lookalike Characters (via process_creation)
id: 17ec7979-cd5d-51dc-968f-680583095a95
status: stable
description: This rule detects the presence of unicode characters which are homoglyphs, or identical in appearance, to ASCII letter characters. This is used as an obfuscation and masquerading techniques. Only "perfect" homoglyphs are included; these are characters that are indistinguishable from ASCII characters and thus may make excellent candidates for homoglyph attack characters.
references:
    - https://attack.mitre.org/techniques/T1036/003/
    - https://attack.mitre.org/techniques/T1036/
    - https://redcanary.com/threat-detection-report/threats/socgholish/#threat-socgholish
    - http://www.irongeek.com/homoglyph-attack-generator.php
author: Huntrule Team
date: 2026-06-28
tags:
    - attack.stealth
    - attack.t1036
    - attack.t1036.003
logsource:
    category: process_creation
    product: windows
detection:
    selection_upper:
        CommandLine|contains:
            - "А"
            - "В"
            - "Е"
            - "К"
            - "М"
            - "Н"
            - "О"
            - "Р"
            - "С"
            - "Т"
            - "Х"
            - "Ѕ"
            - "І"
            - "Ј"
            - "Ү"
            - "Ӏ"
            - "Ԍ"
            - "Ԛ"
            - "Ԝ"
            - "Α"
            - "Β"
            - "Ε"
            - "Ζ"
            - "Η"
            - "Ι"
            - "Κ"
            - "Μ"
            - "Ν"
            - "Ο"
            - "Ρ"
            - "Τ"
            - "Υ"
            - "Χ"
    selection_lower:
        CommandLine|contains:
            - "а"
            - "е"
            - "о"
            - "р"
            - "с"
            - "х"
            - "ѕ"
            - "і"
            - "ӏ"
            - "ј"
            - "һ"
            - "ԁ"
            - "ԛ"
            - "ԝ"
            - "ο"
    condition: 1 of selection_*
falsepositives:
    - Unknown
level: medium