TA0011 · COMMAND AND CONTROL
Internal Proxy
Adversaries may use an internal proxy to direct command and control traffic between two or more systems in a compromised environment. Many tools exist that enable traffic redirection through proxies or port redirection, including HTRAN, ZXProxy, and ZXPortMap.
Detect it with
Analyze network data for uncommon data flows between clients that should not or often do not communicate with one another. Processes utilizing the network that do not normally have network communication or have never been seen before are suspicious.
Why it matters on shift
Internal Proxy is one of the concrete ways adversaries achieve command and control. Recognising it in telemetry lets you name the technique in your ticket and pivot to what came before and after.
What to look for next
After command and control, the next tactic is usually Exfiltration. Search your telemetry for the transition before closing the ticket.
Kill-chain context