sigmamediumHunting

Elevated System Shell Spawned

Detects when a shell program such as the Windows command prompt or PowerShell is launched with system privileges. Use this rule to hunt for potential suspicious processes.

MITRE ATT&CK

T1059

privilege-escalationdefense-evasionexecution

Detection Query

selection_shell:
  - Image|endswith:
      - \powershell.exe
      - \powershell_ise.exe
      - \pwsh.exe
      - \cmd.exe
  - OriginalFileName:
      - PowerShell.EXE
      - powershell_ise.EXE
      - pwsh.dll
      - Cmd.Exe
selection_user:
  User|contains:
    - AUTHORI
    - AUTORI
  LogonId: "0x3e7"
condition: all of selection_*

Author

Nasreddine Bencherchali (Nextron Systems), frack113

Created

2023-11-23

Data Sources

windowsProcess Creation Events

Platforms

windows

References

https://github.com/Wh04m1001/SysmonEoP

Tags

attack.privilege-escalationattack.defense-evasionattack.executionattack.t1059detection.threat-hunting

Raw Content

title: Elevated System Shell Spawned
id: 61065c72-5d7d-44ef-bf41-6a36684b545f
related:
    - id: 178e615d-e666-498b-9630-9ed363038101
      type: similar
status: test
description: |
    Detects when a shell program such as the Windows command prompt or PowerShell is launched with system privileges. Use this rule to hunt for potential suspicious processes.
references:
    - https://github.com/Wh04m1001/SysmonEoP
author: Nasreddine Bencherchali (Nextron Systems), frack113
date: 2023-11-23
modified: 2025-03-06
tags:
    - attack.privilege-escalation
    - attack.defense-evasion
    - attack.execution
    - attack.t1059
    - detection.threat-hunting
logsource:
    product: windows
    category: process_creation
detection:
    selection_shell:
        - Image|endswith:
              - '\powershell.exe'
              - '\powershell_ise.exe'
              - '\pwsh.exe'
              - '\cmd.exe'
        - OriginalFileName:
              - 'PowerShell.EXE'
              - 'powershell_ise.EXE'
              - 'pwsh.dll'
              - 'Cmd.Exe'
    selection_user:
        User|contains: # covers many language settings
            - 'AUTHORI'
            - 'AUTORI'
        LogonId: '0x3e7'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium