How does malware get to communicate with their server undetected?

If there is a malware on my computer that is communicating with a hackers server, they don’t normally open a port on my firewall, they would piggyback on an already open port. That is my understanding.

But if they go through a normal port like 443 and their server is on some random port ##. Then how does my router? or how does their server change the 443 listen to port## listen. If you get what I’m saying?

submitted by /u/KangaJab
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October 21, 2020
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