Detects when a single rules or all of the rules have been deleted from the Windows Defender Firewall

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Detects when a rule has been added to the Windows Firewall exception list

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Detects when a all the rules have been deleted from the Windows Defender Firewall configuration

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Identifies when a firewall is created, modified, or deleted.

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Identifies when Rule Collections (Application, NAT, and Network) is being modified or deleted.

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All TCP traffic on particular port from attacker is routed to different port. ex. '/sbin/iptables -t nat -D PREROUTING -p tcp -s 192.168.1.1 --dport 22 -j REDIRECT --to-ports 42392' The traffic looks like encrypted SSH communications going to TCP port 22, but in reality is being directed to the shell port once it hits the iptables rule for the attacker host only.

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Adversaries may disable or modify system firewalls in order to bypass controls limiting network usage

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

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Detect set EnableFirewall to 0 to disable the Windows firewall

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Detects disabling security tools

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Detects disabling security tools

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Detects netsh commands that turns off the Windows firewall

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Detects the removal of a port or application rule in the Windows Firewall configuration using netsh

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

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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.

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Adversaries may modify system firewalls in order to bypass controls limiting network usage

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Detects the addition of a new rule to the Windows Firewall exception list for an application located in a potentially suspicious location.

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Detects the addition of a new "Allow" firewall rule by the WMI process (WmiPrvSE.EXE). This can occur if an attacker leverages PowerShell cmdlets such as "New-NetFirewallRule", or directly uses WMI CIM classes such as "MSFT_NetFirewallRule".

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Detects the addition of a new rule to the Windows firewall via netsh

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Detects usage of the netsh command to open and allow connections to port 3389 (RDP). As seen used by Sarwent Malware

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Detects Netsh command execution that whitelists a program located in a suspicious location in the Windows Firewall

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Detects activity when The Windows Defender Firewall service failed to load Group Policy

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Detects attempts to force stop the ufw using ufw-init

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Detects activity when Windows Defender Firewall has been reset to its default configuration

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Detects when a user disables the Windows Firewall via a Profile to help evade defense.

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Detects activity when the settings of the Windows firewall have been changed

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Looks for instances of powershell being used to disable or impair Windows Defender functionality. Inspired by the 2022 Red Canary Threat Detection report.

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Looks for instances of powershell being used to modify or degrade Windows Defender functionality. Inspired by the 2022 Red Canary Threat Detection report.

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