win_meterpreter_or_cobaltstrike_getsystem_service_installation.yml

action: global
title: Meterpreter or Cobalt Strike Getsystem Service Installation
id: 843544a7-56e0-4dcc-a44f-5cc266dd97d6
description: Detects the use of getsystem Meterpreter/Cobalt Strike command by detecting a specific service installation
author: Teymur Kheirkhabarov
date: 2019/10/26
modified: 2019/11/11
references:
    - https://speakerdeck.com/heirhabarov/hunting-for-privilege-escalation-in-windows-environment
    - https://blog.cobaltstrike.com/2014/04/02/what-happens-when-i-type-getsystem/
tags:
    - attack.privilege_escalation
    - attack.t1134
detection:
    selection:
        - ServiceFileName|contains:
            - 'cmd'
            - 'comspec'
        # meterpreter getsystem technique 1: cmd.exe /c echo 559891bb017 > \\.\pipe\5e120a
        - ServiceFileName|contains|all:
            - 'cmd'
            - '/c'
            - 'echo'
            - '\pipe\'
        # cobaltstrike getsystem technique 1: %COMSPEC% /c echo 559891bb017 > \\.\pipe\5e120a
        - ServiceFileName|contains|all:
            - '%COMSPEC%'
            - '/c'
            - 'echo'
            - '\pipe\'
        # meterpreter getsystem technique 2: rundll32.exe C:\Users\test\AppData\Local\Temp\tmexsn.dll,a /p:tmexsn
        - ServiceFileName|contains|all:
            - 'rundll32'
            - '.dll,a'
            - '/p:'
    condition: selection
fields:
    - ComputerName
    - SubjectDomainName
    - SubjectUserName
    - ServiceFileName
falsepositives:
    - Highly unlikely
level: critical
---
logsource:
    product: windows
    service: system
detection:
    selection:
        EventID: 7045
---
logsource:
    product: windows
    service: sysmon
detection:
    selection:
        EventID: 6
---
 logsource:
     product: windows
     service: security
 detection:
     selection:
         EventID: 4697