How To: C2 Over ICMP

This blog post demonstrates how to set up a command-and-control (C2) channel over ICMP by running an 'icmpsh' listener on an attacker Kali machine and deploying a PowerShell ICMP client on a Windows victim. The author walks through tool acquisition, disabling machine-based ICMP restrictions, starting the listener, transferring and executing the PowerShell payload, and highlights that ICMP-encapsulated communication can evade proxy-based firewall rules.