Azure ServiceBus WebSockets as a C2 Channel

This report demonstrates how to modify Cobalt Strike's CobaltBus to use Azure Service Bus over WebSockets (AmqpWebSockets) so C2 traffic travels over HTTPS (port 443) instead of TCP/5671, allowing beacons to bypass firewall rules that block nonstandard outbound ports; it includes code snippets, a lab walkthrough, traffic captures, and defensive detection recommendations.