Modify System Firewall Rules
Detects the removal or modification of system firewall rules using common Linux firewall management tools like iptables, firewall-cmd, ufw, and nft. This rule specifically looks for commands that delete or remove existing rules, which adversaries might use to bypass network controls and enable C2 communications, lateral movement, or data exfiltration. This detection aims to catch more granular firewall modifications than just a complete firewall disablement.
Sigma
