Once an adversary has found their way into your environment, gotten a good look around, and decided it’s worth an extended stay, they will often set up command and control (C2). Although there are numerous ways to accomplish this goal, one of them is to allow these mechanisms to communicate over ports an organization may not be watching or blocking. Even more clever is when these C2 infrastructures communicate over known, encrypted ports such as HTTPS on 443. Although this behavior can be tricky to spot, it is possible with the right approach.
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