SigmaHQ/rules/windows/process_creation/win_susp_copy_system32.yml

title: Suspicious Copy From or To System32
id: fff9d2b7-e11c-4a69-93d3-40ef66189767
status: experimental
description: Detects a suspicious copy command that copies a system program from System32 to another directory on disk - sometimes used to use LOLBINs like certutil or desktopimgdownldr to a different location with a different name
author: Florian Roth, Markus Neis
date: 2020/07/03
modified: 2020/09/05
references:
    - https://www.hybrid-analysis.com/sample/8da5b75b6380a41eee3a399c43dfe0d99eeefaa1fd21027a07b1ecaa4cd96fdd?environmentId=120
logsource:
    category: process_creation
    product: windows
tags:
    - attack.defense_evasion
    - attack.t1036.003
detection:
    selection:
        CommandLine|contains: 
            - ' /c copy *\System32\'
            - 'xcopy*\System32\'
    condition: selection
fields:
    - CommandLine
    - ParentCommandLine
falsepositives:
    - False positives depend on scripts and administrative tools used in the monitored environment
    - Admin scripts like https://www.itexperience.net/sccm-batch-files-and-32-bits-processes-on-64-bits-os/
level: medium