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.
Indexed Rules
3,707
Ready to search
Backends
17
Live from sigconverter.io
CLI Versions
10
Newest: 2.0.2
Translation Workspace
Shape the rule before it leaves Phoenix
Tune Translation
Active Rule
HTTP Request With Empty User Agent
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
HTTP Request With Empty User Agent
Using Splunk · Default · sigma-cli 2.0.2
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion2.0.2
title: HTTP Request With Empty User Agent
id: 21e44d78-95e7-421b-a464-ffd8395659c4
status: test
description: |
Detects a potentially suspicious empty user agent strings in proxy log.
Could potentially indicate an uncommon request method.
references:
- https://twitter.com/Carlos_Perez/status/883455096645931008
author: Florian Roth (Nextron Systems)
date: 2017-07-08
modified: 2021-11-27
tags:
- attack.defense-evasion
- attack.command-and-control
- attack.t1071.001
logsource:
category: proxy
detection:
selection:
# Empty string - as used by Powershell's (New-Object Net.WebClient).DownloadString
c-useragent: ''
condition: selection
falsepositives:
- Unknown
level: medium
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/web/proxy_generic/proxy_ua_empty.yml