title: Suspicious TSCON Start as SYSTEM
id: 9847f263-4a81-424f-970c-875dab15b79b
status: experimental
description: Detects a tscon.exe start as LOCAL SYSTEM
references:
    - http://www.korznikov.com/2017/03/0-day-or-feature-privilege-escalation.html
    - https://medium.com/@networksecurity/rdp-hijacking-how-to-hijack-rds-and-remoteapp-sessions-transparently-to-move-through-an-da2a1e73a5f6
    - https://www.ired.team/offensive-security/lateral-movement/t1076-rdp-hijacking-for-lateral-movement
author: Florian Roth
date: 2018/03/17
modified: 2021/11/29
tags:
    - attack.command_and_control
    - attack.t1219
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        User|startswith: 
            - 'NT AUTHORITY\SYSTEM'
            - 'AUTORITE NT\Sys' # French language settings
        Image|endswith: '\tscon.exe'
    condition: selection
falsepositives:
    - Unknown
level: high
