Windows MSTSC Shadowing CommandLine Using shadow:

title: "Windows MSTSC Shadowing CommandLine Using shadow:"
id: a1ce9442-0e37-4fcf-9884-6b1107b7b863
status: test
description: This rule identifies RDP session shadowing activity on Windows by matching process command lines containing both 'noconsentprompt' and 'shadow:'. Attackers use MSTSC shadowing to observe or interact with an existing user session without establishing a typical new session channel. It relies on process creation telemetry with command-line arguments to reliably capture these distinctive parameters.
references:
  - https://twitter.com/kmkz_security/status/1220694202301976576
  - https://github.com/kmkz/Pentesting/blob/47592e5e160d3b86c2024f09ef04ceb87d204995/Post-Exploitation-Cheat-Sheet
  - https://github.com/SigmaHQ/sigma/blob/master/rules/windows/process_creation/proc_creation_win_mstsc_rdp_hijack_shadowing.yml
author: Florian Roth (Nextron Systems), Huntrule Team
date: 2020-01-24
modified: 2023-02-05
tags:
  - attack.lateral-movement
  - attack.t1563.002
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    CommandLine|contains|all:
      - noconsentprompt
      - "shadow:"
  condition: selection
falsepositives:
  - Unknown
level: high
license: DRL-1.1
related:
  - id: 6ba5a05f-b095-4f0a-8654-b825f4f16334
    type: derived