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.
Indexed Rules
3,779
Ready to search
Backends
3
Loaded from pysigma-node
pySigma Versions
2
Newest: 2.0.1
Translation Workspace
Shape the rule before it leaves Phoenix
Tune Translation
Active Rule
Google Workspace Out Of Domain Email Forwarding
Backends follow their supported pySigma version. Select 1.5.1 for Elasticsearch, Kusto, and other 1.x plugins.
Target Profile
Splunk
Splunk through pysigma-backend-splunk.
Format Mode
Default
Default pySigma output mode for this backend.
Google Workspace Out Of Domain Email Forwarding
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.
title: Google Workspace Out Of Domain Email Forwarding
id: 2a0bb2dd-eb5f-4517-8cb9-404f8ba764a5
status: experimental
description: Detects automatic email forwarding to external domains in Google Workspace, which may indicate data leakage or misuse.
references:
- https://developers.google.com/workspace/admin/reports/v1/appendix/activity/login#email_forwarding_out_of_domain
author: Tom kluter
date: 2026-04-28
tags:
- attack.t1114.003
- attack.collection
logsource:
product: gcp
service: google_workspace.login
detection:
selection:
protoPayload.serviceName: 'login.googleapis.com'
protoPayload.metadata.event.eventName: 'email_forwarding_out_of_domain'
condition: selection
falsepositives:
- Legitimate forwarding
level: medium
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/cloud/gcp/gworkspace/login/gcp_gworkspace_out_of_domain_email_forwarding.yml'