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 VSFTPD Error Messages
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Suspicious VSFTPD Error Messages
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 VSFTPD Error Messages
id: 377f33a1-4b36-4ee1-acee-1dbe4b43cfbe
status: test
description: Detects suspicious VSFTPD error messages that indicate a fatal or suspicious error that could be caused by exploiting attempts
references:
- https://github.com/dagwieers/vsftpd/
author: Florian Roth (Nextron Systems)
date: 2017-07-05
modified: 2021-11-27
tags:
- attack.initial-access
- attack.t1190
logsource:
product: linux
service: vsftpd
detection:
keywords:
- 'Connection refused: too many sessions for this address.'
- 'Connection refused: tcp_wrappers denial.'
- 'Bad HTTP verb.'
- 'port and pasv both active'
- 'pasv and port both active'
- 'Transfer done (but failed to open directory).'
- 'Could not set file modification time.'
- 'bug: pid active in ptrace_sandbox_free'
- 'PTRACE_SETOPTIONS failure'
- 'weird status:'
- 'couldn''t handle sandbox event'
- 'syscall * out of bounds'
- 'syscall not permitted:'
- 'syscall validate failed:'
- 'Input line too long.'
- 'poor buffer accounting in str_netfd_alloc'
- 'vsf_sysutil_read_loop'
condition: keywords
falsepositives:
- Unknown
level: medium
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/linux/builtin/vsftpd/lnx_vsftpd_susp_error_messages.yml