SigmaHQ/rules/windows/sysmon/sysmon_powershell_download.yml

title: PowerShell Download from URL
status: experimental
description: Detects a Powershell process that contains download commands in its command line string
author: Florian Roth
logsource:
    product: windows
    service: sysmon
detection:
    selection:
        EventID: 1
        Image: '*\powershell.exe'
        CommandLine: 
            - '*new-object system.net.webclient).downloadstring(*'
            - '*new-object system.net.webclient).downloadfile(*'
    condition: selection
fields:
    - CommandLine
    - ParentCommandLine
falsepositives:
    - unknown
level: medium