Listeners on JustC2 Docs

BeaconHTTP Listener

Sat, 19 Sep 2026 00:00:00 +0000

Overview

BeaconHTTP is an external listener that registers endpoints on the teamserver’s HTTP server. Beacon agents communicate with the teamserver over HTTP/HTTPS through these endpoints. Since it shares the teamserver’s TLS certificate and port, it blends naturally with the server’s web presence.

BeaconTCP Listener

Sat, 19 Sep 2026 00:00:00 +0000

Overview

BeaconTCP is an internal (bind) listener that opens its own TCP port, independent of the teamserver’s HTTP server. Beacon agents connect directly to this port using a raw TCP protocol.

BeaconSMB Listener

Sat, 19 Sep 2026 00:00:00 +0000

Overview

BeaconSMB is an internal (bind) listener that communicates with Beacon agents over SMB named pipes. This is particularly useful for lateral movement within Windows environments where SMB traffic is normal and expected.

BeaconDNS Listener

Sat, 19 Sep 2026 00:00:00 +0000

Overview

BeaconDNS is an external listener that uses DNS queries and responses to establish a covert C2 channel. DNS-based C2 is slow but extremely difficult to block, since DNS resolution is required for almost all network activity.

GopherTCP Listener

Sat, 19 Sep 2026 00:00:00 +0000

Overview

GopherTCP is an external listener designed for the Gopher agent type. It registers TCP endpoints for lightweight, Go-based agents that target Linux systems.