Sigma rule: Flush Iptables Ufw Chain

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-f744f8d33030, updated 2023-01-18T00:00:00.000Z.

Rule

Title
Flush Iptables Ufw Chain
Status
test
Level
medium
Author
Joseliyo Sanchez, @Joseliyo_Jstnk
Date
2023-01-18
File
rules/linux/process_creation/proc_creation_lnx_iptables_flush_ufw.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detect use of iptables to flush all firewall rules, tables and chains and allow all network traffic

Log source

product
linux
category
process_creation

Detection

selection_img:
    Image|endswith:
        - '/iptables'
        - '/xtables-legacy-multi'
        - '/iptables-legacy-multi'
        - '/ip6tables'
        - '/ip6tables-legacy-multi'
selection_params:
    CommandLine|contains:
        - '-F'
        - '-Z'
        - '-X'
selection_ufw:
    CommandLine|contains:
        - 'ufw-logging-deny'
        - 'ufw-logging-allow'
        - 'ufw6-logging-deny'
        - 'ufw6-logging-allow'
        # - 'ufw-reject-output'
        # - 'ufw-track-inputt'
condition: all of selection_*

False positives (as the rule lists them)

  • Network administrators

Tags

  • attack.defense-impairment
  • attack.t1686

MITRE ATT&CK ids this rule names

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/process_creation/proc_creation_lnx_iptables_flush_ufw.yml

Sources and licences

  • SigmaHQ

    "Flush Iptables Ufw Chain" by Joseliyo Sanchez, @Joseliyo_Jstnk (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/process_creation/proc_creation_lnx_iptables_flush_ufw.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: Flush Iptables Ufw Chain",
entity page, dataset version ref-f744f8d33030, updated 2023-01-18T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/3be619f4-d9ec-4ea8-a173-18fdd01996ab (accessed 2026-11-03).
Underlying source: SigmaHQ rule 3be619f4-d9ec-4ea8-a173-18fdd01996ab, 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.