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
3,731
Ready to search
Backends
17
Live from sigconverter.io
CLI Versions
10
Newest: 3.0.2
Translation Workspace
Shape the rule before it leaves Phoenix
Tune Translation
Active Rule
Suspicious Email Delivered In Microsoft 365
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Suspicious Email Delivered In Microsoft 365
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: Suspicious Email Delivered In Microsoft 365
id: 3569aefd-e535-4391-8c18-24bd01a21eaf
status: experimental
description: |
Detects instances where an email, identified as malicious or suspicious by the Microsoft Defender for Office 365 (formerly ATP) engine, was delivered to a user's Inbox or Junk folder.
It might indicate that a potential threat, such as a spearphishing attachment or links, has bypassed initial blocking mechanisms and reached an end-user, requiring further investigation and potential remediation.
references:
- https://learn.microsoft.com/en-us/defender-office-365/threat-explorer-real-time-detections-about
- https://research.splunk.com/cloud/605cc93a-70e4-4ee3-9a3d-1a62e8c9b6c2/
- https://github.com/Bert-JanP/Hunting-Queries-Detection-Rules/blob/e7250648cb16d4a497ae8737943bf010ea96d2e6/Defender%20For%20Cloud%20Apps/MaliciousEmailDeliveredInMailbox.md
author: Marco Pedrinazzi (@pedrinazziM) (InTheCyber)
date: 2026-01-27
tags:
- attack.initial-access
- attack.t1566.001
- attack.t1566.002
logsource:
service: audit
product: m365
detection:
selection:
Workload: 'ThreatIntelligence'
Operation: 'TIMailData'
Directionality: 'Inbound'
filter_main_blocked:
DeliveryAction: 'Blocked'
condition: selection and not 1 of filter_main_*
falsepositives:
- Unlikely
level: medium
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/cloud/m365/audit/microsoft365_suspicious_email_delivered.yml