Potential Exploitation Attempt Of Undocumented WindowsServer RCE

title: Potential Exploitation Attempt Of Undocumented WindowsServer RCE
id: 6d5b8176-d87d-4402-8af4-53aee9db7b5d
status: test
description: Detects potential exploitation attempt of undocumented Windows Server Pre Auth Remote Code Execution (RCE)
references:
    - https://github.com/SigmaHQ/sigma/pull/3946
    - https://twitter.com/hackerfantastic/status/1616455335203438592?s=20
author: Florian Roth (Nextron Systems), Nasreddine Bencherchali
date: 2023-01-21
tags:
    - attack.initial-access
    - attack.t1190
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\svchost.exe'
        Image|endswith: '\svchost.exe'
        ParentCommandLine|contains: '-k DHCPServer'
        CommandLine|contains: '-k DHCPServer'
        User|contains: # Covers many language settings for Network Service. Please expand.
            - 'NETWORK SERVICE'
            - 'NETZWERKDIENST'
            - 'SERVIZIO DI RETE'
            - 'SERVICIO DE RED'
    condition: selection
falsepositives:
    - Unknown
level: high