Posts Tagged ‘Programming socket’
Port-knocking Backdoor
October 21, 2010
6 comments
Hi.
In this post I’ll explain to you how to make a *unix backdoor using a “port knocking” scheme. That is, if we’ll “knock” to some TCP ports that we have initially decided, our program will open a backdoor for us (but only for us :) ).
How does the “port knocking” scheme work? The attacker decides a particular sequence of packets that will be sent to a compromised server where the backdoor is running. When the backdoor program will receive this particular sequence then it will give to the attacker the server’s shell.
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Categories: C/C++, GNU/Linux, Security
backdoor, port knocking, Programming socket, pthread timeout, raw socket, shell backdoor, sniffer