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PyDCrypt has modified firewall rules to allow incoming SMB, NetBIOS, and RPC connections using netsh.exe on remote machines. ĭuring Operation Wocao, threat actors used PowerShell to add and delete rules in the Windows firewall. NjRAT has modified the Windows firewall to allow itself to communicate through the firewall. Netsh can be used to disable local firewall settings. NanoCore can modify the victim's firewall. Moses Staff has used batch scripts that can disable the Windows firewall on specific remote machines. Magic Hound has added the following rule to a victim's Windows firewall to allow RDP traffic - "netsh" advfirewall firewall add rule name="Terminal Server" dir=in action=allow protocol=TCP localport=3389. Various Lazarus Group malware modifies the Windows firewall to allow incoming connections or disable it entirely using netsh. Kimsuky has been observed disabling the system firewall.

Kasidet has the ability to change firewall settings to allow a plug-in to be downloaded. InvisiMole has a command to disable routing and the Firewall on the victim’s machine. HOPLIGHT has modified the firewall using netsh. HARDRAIN opens the Windows Firewall to modify incoming connections. H1N1 kills and disables services for Windows Firewall. Grandoreiro can block the Deibold Warsaw GAS Tecnologia security tool at the firewall level. The group has also globally opened port 3389. ĭragonfly has disabled host-based firewalls. ĭarkComet can disable Security Center functions like the Windows Firewall.

Ĭyclops Blink can modify the Linux iptables firewall to enable C2 communication via a stored list of port numbers. ĬookieMiner has checked for the presence of "Little Snitch", macOS network monitoring and application firewall software, stopping and exiting if it is found.

Ĭarbanak may use netsh to add local firewall rule exceptions.

īADCALL disables the Windows firewall before binding to a port. BACKSPACE will attempt to establish a C2 channel, then will examine open windows to identify a pop-up from the firewall software and will simulate a mouse-click to allow the connection to proceed. The "ZR" variant of BACKSPACE will check to see if known host-based firewalls are installed on the infected systems. ĪPT38 have created firewall exemptions on specific ports, including ports 443, 6443, 8443, and 9443. APT29 used netsh to configure firewall rules that limited certain UDP outbound packets.