Netcat with cmd exec, connect, listen and (local/remote) port-forwarding modes. It is similar to telnet command with some additional features. It is used for many purposes such as read and writes data on a remote computer by using TCP and UDP packets, create raw connections with other computers in a network, banner grabbing etc. Are you sure netcat can be used as a backdoor? Netcat is an awesome Linux command used by network administrators and security experts. When an attacker successfully compromise a system they need to maintain the connection, that's why the attacker usually installing backdoor on victim computer for future use to make attacker easily connect to victim computer to use victim resource, and collecting data on victim computer.
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