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 local pySigma backend, then reveal pipelines only when you actually need them.

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Indexed Rules

3,779

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Backends

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pySigma Versions

Newest: 2.0.1

Translation Workspace

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Active Rule

HackTool - Defendnot Installation via PowerShell One-Liner

pySigma version

Backends follow their supported pySigma version. Select 1.5.1 for Elasticsearch, Kusto, and other 1.x plugins.

Backend

Format

Target Profile

Splunk

Splunk through pysigma-backend-splunk.

Format Mode

Default

Default pySigma output mode for this backend.

Conversion Output

HackTool - Defendnot Installation via PowerShell One-Liner

Using Splunk · Default · pySigma 2.0.1

Translation controls

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

BackendSplunkFormatDefaultVersion2.0.1

title: HackTool - Defendnot Installation via PowerShell One-Liner
id: 50b159ba-a147-40f7-9d11-561e724b8a2e
related:
    - id: 0aaa9689-9f38-491d-bd4d-a9af6eb43138
      type: similar
status: experimental
description: |
    Detects execution of Defendnot installation via PowerShell one-liner that downloads and executes the Defendnot script from a remote URL.
    Defendnot is a hacktool that abuses Microsoft's undocumented WSC API to disable Windows Defender by registering itself as a fake antivirus product.
references:
    - https://github.com/es3n1n/defendnot/blob/525176a37721ead27d3f9f77f59b58abfc305988/README.md#one-liner
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2026-10-18
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    category: ps_script
    product: windows
detection:
    selection:
        - ScriptBlockText|contains: 'https://dnot.sh/'
        - ScriptBlockText|contains|all:
              - '/defendnot'
              - 'github' # covers both api.github.com and raw.githubusercontent.com
    condition: selection
falsepositives:
    - Unlikely
level: high

CLI command

Sigma CLI 4.0.0 · Install matching versions, then run from the Phoenix project directory.

python -m pip install 'sigma-cli==4.0.0' 'pysigma==2.0.1' 'pysigma-backend-splunk==3.0.0'
sigma convert --without-pipeline -t splunk -f default 'sigma/rules/windows/powershell/powershell_script/posh_ps_hktl_defendnot_installation.yml'