TA0010 · EXFILTRATION
Exfiltration Over C2 Channel
Data sent out through the same channel already used for control.
Detect it with
Upload volume far exceeding download on a long-lived session; sustained outbound to a single rare host.
Why it matters on shift
Exfiltration Over C2 Channel is one of the concrete ways adversaries achieve exfiltration. 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 exfiltration, the next tactic is usually Impact. Search your telemetry for the transition before closing the ticket.
Kill-chain context