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
Suspicious Base64 Encoded User-Agent
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Suspicious Base64 Encoded 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: Suspicious Base64 Encoded User-Agent
id: d443095b-a221-4957-a2c4-cd1756c9b747
related:
- id: 894a8613-cf12-48b3-8e57-9085f54aa0c3
type: derived
status: test
description: Detects suspicious encoded User-Agent strings, as seen used by some malware.
references:
- https://deviceatlas.com/blog/list-of-user-agent-strings#desktop
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-05-04
tags:
- attack.command-and-control
- attack.t1071.001
logsource:
category: proxy
detection:
selection:
c-useragent|startswith:
- 'Q2hyb21l' # Chrome Encoded with offset to not include padding
- 'QXBwbGVXZWJLaX' # AppleWebKit Encoded with offset to not include padding
- 'RGFsdmlr' # Dalvik Encoded with offset to not include padding
- 'TW96aWxsY' # Mozilla Encoded with offset to not include padding (as used by YamaBot)
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_base64_encoded.yml