Suspicious PowerShell Download Pattern (via process_creation)

title: Suspicious PowerShell Download Pattern (via process_creation)
id: fbd716fe-69d1-55dd-ba7c-13554d53abe8
status: stable
description: This rule detects a Powershell process that contains download commands in its command line string
references:
    - https://attack.mitre.org/techniques/T1059/001/
    - https://blog.redteam.pl/2020/06/black-kingdom-ransomware.html
    - https://lab52.io/blog/winter-vivern-all-summer/
    - https://hatching.io/blog/powershell-analysis/
author: Huntrule Team
date: 2026-02-22
tags:
    - attack.execution
    - attack.t1059.001
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith:
              - '\powershell_ise.exe'
              - '\powershell.exe'
              - '\pwsh.exe'
        - OriginalFileName:
              - 'PowerShell_ISE.EXE'
              - 'PowerShell.EXE'
              - 'pwsh.dll'
    selection_cli:
        CommandLine|contains|all:
            - 'new-object'
            - 'net.webclient).'
            - 'download'
        CommandLine|contains:
            - 'string('
            - 'file('
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium