title: Powershell Reverse Shell Connection
id: edc2f8ae-2412-4dfd-b9d5-0c57727e70be
status: experimental
description: Detects the Nishang Invoke-PowerShellTcpOneLine reverse shell
author: FPT.EagleEye, wagga
references:
    - https://www.volexity.com/blog/2021/03/02/active-exploitation-of-microsoft-exchange-zero-day-vulnerabilities/
    - https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/
date: 2021/03/03
modified: 2021/06/27
tags:
    - attack.execution
    - attack.t1086 # an old one
    - attack.t1059.001
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\powershell.exe'
        CommandLine|contains:
            - 'new-object system.net.sockets.tcpclient'
    condition: selection
fields:
    - CommandLine
    - ParentCommandLine
falsepositives:
    - Administrative might use this function for checking network connectivity
level: high