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Active Rule

Potential Homoglyph Attack Using Lookalike Characters

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Potential Homoglyph Attack Using Lookalike Characters

Using Splunk · Default · sigma-cli 2.0.2

Translation controls

Adjust the rule on the left, then regenerate when you want a fresh backend-native query.

BackendSplunkFormatDefaultVersion2.0.2

title: Potential Homoglyph Attack Using Lookalike Characters
id: 32e280f1-8ad4-46ef-9e80-910657611fbc
status: test
description: |
    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://redcanary.com/threat-detection-report/threats/socgholish/#threat-socgholish
    - http://www.irongeek.com/homoglyph-attack-generator.php
author: Micah Babinski, @micahbabinski
date: 2023-05-07
tags:
    - attack.defense-evasion
    - attack.t1036
    - attack.t1036.003
   # - attack.t1036.008
logsource:
    category: process_creation
    product: windows
detection:
    selection_upper:
        CommandLine|contains:
            - "\u0410" # А/A
            - "\u0412" # В/B
            - "\u0415" # Е/E
            - "\u041a" # К/K
            - "\u041c" # М/M
            - "\u041d" # Н/H
            - "\u041e" # О/O
            - "\u0420" # Р/P
            - "\u0421" # С/C
            - "\u0422" # Т/T
            - "\u0425" # Х/X
            - "\u0405" # Ѕ/S
            - "\u0406" # І/I
            - "\u0408" # Ј/J
            - "\u04ae" # Ү/Y
            - "\u04c0" # Ӏ/I
            - "\u050C" # Ԍ/G
            - "\u051a" # Ԛ/Q
            - "\u051c" # Ԝ/W
            - "\u0391" # Α/A
            - "\u0392" # Β/B
            - "\u0395" # Ε/E
            - "\u0396" # Ζ/Z
            - "\u0397" # Η/H
            - "\u0399" # Ι/I
            - "\u039a" # Κ/K
            - "\u039c" # Μ/M
            - "\u039d" # Ν/N
            - "\u039f" # Ο/O
            - "\u03a1" # Ρ/P
            - "\u03a4" # Τ/T
            - "\u03a5" # Υ/Y
            - "\u03a7" # Χ/X
    selection_lower:
        CommandLine|contains:
            - "\u0430" # а/a
            - "\u0435" # е/e
            - "\u043e" # о/o
            - "\u0440" # р/p
            - "\u0441" # с/c
            - "\u0445" # х/x
            - "\u0455" # ѕ/s
            - "\u0456" # і/i
            - "\u04cf" # ӏ/l
            - "\u0458" # ј/j
            - "\u04bb" # һ/h
            - "\u0501" # ԁ/d
            - "\u051b" # ԛ/q
            - "\u051d" # ԝ/w
            - "\u03bf" # ο/o
    condition: 1 of selection_*
falsepositives:
    - Commandlines with legitimate Cyrillic text; will likely require tuning (or not be usable) in countries where these alphabets are in use.
level: medium

CLI command

Copy the exact command to reproduce this translation locally.

sigma convert --without-pipeline -t splunk -f default rules/windows/process_creation/proc_creation_win_susp_homoglyph_cyrillic_lookalikes.yml