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.

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Indexed Rules

3,707

Ready to search

Backends

Live from sigconverter.io

CLI Versions

Newest: 2.0.2

Translation Workspace

Shape the rule before it leaves Phoenix

Tune Translation

Active Rule

Modify System Firewall

sigma-cli version

Backend

Format

Target Profile

Splunk

Splunk SPL & tstats data model queries

Format Mode

Default

Plain SPL queries

Conversion Output

Modify System Firewall

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: Modify System Firewall
id: 323ff3f5-0013-4847-bbd4-250b5edb62cc
related:
    - id: 53059bc0-1472-438b-956a-7508a94a91f0
      type: similar
status: test
description: |
    Detects the removal of system firewall rules. Adversaries may only delete or modify a specific system firewall rule to bypass controls limiting network usage or access.
    Detection rules that match only on the disabling of firewalls will miss this.
references:
    - https://www.trendmicro.com/en_us/research/22/c/cyclops-blink-sets-sights-on-asus-routers--.html
    - https://blog.aquasec.com/container-security-tnt-container-attack
    - https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_networking/getting-started-with-nftables_configuring-and-managing-networking
author: IAI
date: 2023-03-06
modified: 2025-10-12
tags:
    - attack.t1562.004
    - attack.defense-evasion
logsource:
    product: linux
    service: auditd
detection:
    selection1:
        type: 'EXECVE'
        a0: 'iptables'
        a1|contains: 'DROP'
    selection2:
        type: 'EXECVE'
        a0: 'firewall-cmd'
        a1|contains: 'remove'
    selection3:
        type: 'EXECVE'
        a0: 'ufw'
        a1|contains: 'delete'
    selection4:
        type: 'EXECVE'
        a0: 'nft'
        a1|contains:
            - 'delete'
            - 'flush'
    condition: 1 of selection*
falsepositives:
    - Legitimate admin activity
level: medium

CLI command

Copy the exact command to reproduce this translation locally.

sigma convert --without-pipeline -t splunk -f default rules/linux/auditd/execve/lnx_auditd_modify_system_firewall.yml