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proc_creation_win_mode_codepage_russian.yml
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proc_creation_win_mode_codepage_russian.yml
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title: CodePage Modification Via MODE.COM To Russian Language
id: 12fbff88-16b5-4b42-9754-cd001a789fb3
related:
- id: d48c5ffa-3b02-4c0f-9a9e-3c275650dd0e
type: derived
status: experimental
description: |
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://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: Joseliyo Sanchez, @Joseliyo_Jstnk
date: 2024/01/17
tags:
- attack.defense_evasion
- attack.t1036
logsource:
category: process_creation
product: windows
detection:
# VT Query: behavior:"mode con cp select=1251"
# VT Query: behavior:"mode con cp select=866"
selection_img:
- Image|endswith: '\mode.com'
- OriginalFileName: 'MODE.COM'
selection_cli:
CommandLine|contains|all:
- ' con '
- ' cp '
- ' select='
CommandLine|endswith:
- '=1251' # ANSI Cyrillic; Cyrillic (Windows) - Observed ITW by Dharma ransomware
- '=866' # OEM Russian; Cyrillic (DOS) - Observed ITW by other malware
condition: all of selection_*
falsepositives:
- Russian speaking people changing the CodePage
level: medium