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
User Added To Root/Sudoers Group Using Usermod
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
User Added To Root/Sudoers Group Using Usermod
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: User Added To Root/Sudoers Group Using Usermod
id: 6a50f16c-3b7b-42d1-b081-0fdd3ba70a73
status: test
description: Detects usage of the "usermod" binary to add users add users to the root or suoders groups
references:
- https://pberba.github.io/security/2021/11/23/linux-threat-hunting-for-persistence-account-creation-manipulation/
- https://www.configserverfirewall.com/ubuntu-linux/ubuntu-add-user-to-root-group/
author: TuanLe (GTSC)
date: 2022-12-21
tags:
- attack.privilege-escalation
- attack.persistence
logsource:
product: linux
category: process_creation
detection:
selection:
Image|endswith: '/usermod'
CommandLine|contains:
- '-aG root'
- '-aG sudoers'
condition: selection
falsepositives:
- Legitimate administrator activities
level: medium
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/linux/process_creation/proc_creation_lnx_usermod_susp_group.yml