Suspicious IO.FileStream

 1title: Suspicious IO.FileStream
 2id: 70ad982f-67c8-40e0-a955-b920c2fa05cb
 3status: test
 4description: 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.
 5references:
 6    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1006/T1006.md
 7author: frack113
 8date: 2022-01-09
 9modified: 2022-03-05
10tags:
11    - attack.defense-evasion
12    - attack.t1070.003
13logsource:
14    product: windows
15    category: ps_script
16    definition: 'Requirements: Script Block Logging must be enabled'
17detection:
18    selection:
19        ScriptBlockText|contains|all:
20            - New-Object
21            - IO.FileStream
22            - '\\\\.\\'
23    condition: selection
24falsepositives:
25    - Legitimate PowerShell scripts
26level: medium