Detectionmediumtest

Flush Iptables Ufw Chain

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

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

Launch

Joseliyo SanchezCreated Wed Jan 183be619f4-d9ec-4ea8-a173-18fdd01996ablinux

Log Source

LinuxProcess Creation

ProductLinux← raw: linux

CategoryProcess Creation← raw: process_creation

Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.

Detection Logic

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_*