Sigma rule: Disable System Firewall

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-2ecd9c69b357, updated 2022-01-22T00:00:00.000Z.

Rule

Title: Disable System Firewall
Status: test
Level: high
Author: Pawel Mazur
Date: 2022-01-22
File: rules/linux/auditd/service_stop/lnx_auditd_disable_system_firewall.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects disabling of system firewalls which could be used by adversaries to bypass controls that limit usage of the network.

Log source

product: linux
service: auditd

Detection

selection:
    type: 'SERVICE_STOP'
    unit:
        - 'firewalld'
        - 'iptables'
        - 'ufw'
condition: selection

False positives (as the rule lists them)

Admin activity

MITRE ATT&CK ids this rule names

T1686

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/auditd/service_stop/lnx_auditd_disable_system_firewall.yml

Sources and licences

SigmaHQ
"Disable System Firewall" by Pawel Mazur (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/auditd/service_stop/lnx_auditd_disable_system_firewall.yml.
Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License
Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Disable System Firewall",
entity page, dataset version ref-2ecd9c69b357, updated 2022-01-22T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/53059bc0-1472-438b-956a-7508a94a91f0 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 53059bc0-1472-438b-956a-7508a94a91f0, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.