SigmaHQ/rules/windows/sysmon/sysmon_susp_tscon_localsystem.yml

title: Suspicious TSCON Start
status: experimental
description: Detects a tscon.exe start as LOCAL SYSTEM 
reference: 
    - 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
author: Florian Roth
date: 2018/03/17
logsource:
    product: windows
    service: sysmon
detection:
    selection:
        EventID: 1
        User: 'NT AUTHORITY\SYSTEM'
        Image: '*\tscon.exe'
    condition: selection
falsepositives:
    - Unknown
level: high