title: Suspicious CodePage Switch Via CHCP
id: c7942406-33dd-4377-a564-0f62db0593a3
status: test
description: Detects a code page switch in command line or batch scripts to a rare language
references:
- https://learn.microsoft.com/en-us/windows/win32/intl/code-page-identifiers
- https://twitter.com/cglyer/status/1183756892952248325
author: Florian Roth (Nextron Systems), Jonhnathan Ribeiro, oscd.community
date: 2019-10-14
modified: 2023-03-07
tags:
- attack.stealth
- attack.t1036
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith: '\chcp.com'
CommandLine|endswith:
- ' 936' # Chinese
# - ' 1256' # Arabic
- ' 1258' # Vietnamese
# - ' 855' # Russian
# - ' 866' # Russian
# - ' 864' # Arabic
condition: selection
falsepositives:
- Administrative activity (adjust code pages according to your organization's region)
level: medium
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_chcp_codepage_switch/info.yml