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MediumSigmaHQ IAI

Modify System Firewall

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…

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.

Detection logic

Detection requirements

Platform: ESXi Linux macOS Network Devices Windows
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source product: linux
Log source service: auditd

Known benign triggers

Legitimate admin activity

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
blog.aquasec.com/container-security-tnt-container-attack	Unclassified	Only this detection cites it
docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_networking/getting-started-with-nftables_configuring-and-managing-networking	Unclassified	Only this detection cites it
www.trendmicro.com/en_us/research/22/c/cyclops-blink-sets-sights-on-asus-routers--.html	Threat report	4from 2 sources

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