title: Suspicious IO.FileStream
id: 70ad982f-67c8-40e0-a955-b920c2fa05cb
status: experimental
description: Open a handle on the drive volume via the \\.\ DOS device path specifier and perform direct access read of the first few bytes of the volume.
date: 2022/01/09
modified: 2022/03/05
author: frack113
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1006/T1006.md
logsource:
    product: windows
    category: ps_script
    definition: Script block logging must be enabled
detection:
    selection:
        ScriptBlockText|contains|all:
            - New-Object 
            - IO.FileStream
            - '\\\\.\\'
    condition: selection
falsepositives:
    - Legitimate PowerShell scripts
level: medium
tags:
    - attack.defense_evasion
    - attack.t1070.003