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Phoenix Studio

Convert indexed Sigma rules into analyst-ready detections.

This studio is built around Phoenix's own rule corpus, not a blank editor. Search by title or rule id, choose a live sigma-cli backend, then reveal pipelines only when you actually need them.

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Indexed Rules

3,731

Ready to search

Backends

22

Live from sigconverter.io

CLI Versions

10

Newest: 3.0.2

Translation Workspace

Shape the rule before it leaves Phoenix

Tune Translation

Active Rule

PowerShell Download Via Net.WebClient - PowerShell Classic

Target Profile

Splunk

Splunk SPL & tstats data model queries

Format Mode

Default

Plain SPL queries

Conversion Output

PowerShell Download Via Net.WebClient - PowerShell Classic

Using Splunk · Default · sigma-cli 3.0.2

Translation controls

Adjust the rule on the left, then regenerate when you want a fresh backend-native query.

BackendSplunkFormatDefaultVersion3.0.2
title: PowerShell Download Via Net.WebClient - PowerShell Classic
id: 3236fcd0-b7e3-4433-b4f8-86ad61a9af2d
related:
    - id: 65531a81-a694-4e31-ae04-f8ba5bc33759
      type: derived
status: test
description: |
    Detects PowerShell download activity, via the .DownloadFile() or .DownloadString() methods of the Net.WebClient class.
    This technique is often abused by attackers to download additional payloads.
references:
    - https://www.trendmicro.com/en_us/research/22/j/lv-ransomware-exploits-proxyshell-in-attack.html
author: Florian Roth (Nextron Systems)
date: 2017-03-05
modified: 2026-04-28
tags:
    - attack.execution
    - attack.command-and-control
    - attack.t1059.001
    - attack.t1105
logsource:
    product: windows
    category: ps_classic_start
detection:
    selection_webclient:
        Data|contains: 'Net.WebClient'
    selection_download:
        Data|contains:
            - '.DownloadFile('
            - '.DownloadString('
    condition: all of selection_*
falsepositives:
    - This activity may be used by legitimate software, such as patch management tools or software updaters. Investigate any such activity and apply the necessary filter.
level: low

CLI command

Copy the exact command to reproduce this translation locally.

sigma convert --without-pipeline -t splunk -f default rules/windows/powershell/powershell_classic/posh_pc_download_via_webclient.yml