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
Potential MFA Bypass Using Legacy Client Authentication
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Potential MFA Bypass Using Legacy Client Authentication
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: Potential MFA Bypass Using Legacy Client Authentication
id: 53bb4f7f-48a8-4475-ac30-5a82ddfdf6fc
status: test
description: Detects successful authentication from potential clients using legacy authentication via user agent strings. This could be a sign of MFA bypass using a password spray attack.
references:
- https://web.archive.org/web/20230217071802/https://blooteem.com/march-2022
- https://www.microsoft.com/en-us/security/blog/2021/10/26/protect-your-business-from-password-sprays-with-microsoft-dart-recommendations/
author: Harjot Singh, '@cyb3rjy0t'
date: 2023-03-20
tags:
- attack.privilege-escalation
- attack.persistence
- attack.defense-evasion
- attack.initial-access
- attack.credential-access
- attack.t1078.004
- attack.t1110
logsource:
product: azure
service: signinlogs
detection:
selection:
Status: 'Success'
userAgent|contains:
- 'BAV2ROPC'
- 'CBAinPROD'
- 'CBAinTAR'
condition: selection
falsepositives:
- Known Legacy Accounts
level: high
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/cloud/azure/signin_logs/azure_ad_suspicious_signin_bypassing_mfa.yml