Suspicious CodePage Change Through MODE.COM To Russian Language (via process_creation)

title: Suspicious CodePage Change Through MODE.COM To Russian Language (via process_creation)
id: 829797f4-a75f-5cc3-8a3f-76a572890f80
status: stable
description: This rule detects a CodePage modification using the "mode.com" utility to Russian language. This behavior has been used by threat actors behind Dharma ransomware.
references:
    - https://attack.mitre.org/techniques/T1036/
    - https://learn.microsoft.com/en-us/windows/win32/intl/code-page-identifiers
    - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/mode
    - https://strontic.github.io/xcyclopedia/library/mode.com-59D1ED51ACB8C3D50F1306FD75F20E99.html
    - https://www.virustotal.com/gui/file/5e75ef02517afd6e8ba6462b19217dc4a5a574abb33d10eb0f2bab49d8d48c22/behavior
author: Huntrule Team
date: 2026-06-20
tags:
    - attack.stealth
    - attack.t1036
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\mode.com'
        - OriginalFileName: 'MODE.COM'
    selection_cli:
        CommandLine|contains|all:
            - ' con '
            - ' cp '
            - ' select='
        CommandLine|endswith:
            - '=1251'
            - '=866'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium