this post was submitted on 24 Aug 2024
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Programming
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Its costs him time - which is the point. They would have to do more detailed checks on every port which costs them time. Attackers are typically scanning loads of ports over large ranges of IPs, any small slow down on each can drastically slow down their overall progress making the attack less feasible and more expensive to undertake.
but an attacker isn't obliged to take on all the open ports, he could work with some of them - the ones that may seem the most interesting to him
That's probably a majority of the point. Falsely report that some interesting ports are open and he'll spend time on them and potentially trigger alerts or blocks.
Fake open ports aren't something a normal user would bother with or understand, but with all the tools available in the nefarious side, it makes sense to have options that make their job harder if you're willing to use them.
Yes, which limits the amount of ports they can search and thus can be used to hide things on less popular ports. It is not going to stop an attacker. Just makes their job a bit harder or less complete.