Figure 3 shows how we have extracted the web server header (Apache/2.2.14). Machine B C:> nc –v –w 2 –z 192.168.118.130 1-100īanner Grabbing: Extending this same feature, we can also perform banner grabbing. Netcat as a port scanner is demonstrated in figure 2. It does not provide a very detailed output and has no advanced feature such as OS fingerprinting, yet it is capable of detecting if a port is open or not. Port Scanning: Although there are many sophisticated tools available for the purpose of port scanning a host such as Nmap and Scapy, Netcat can also be used for it. We need to configure Netcat to listen on a specific port at one machine and connect to that specific address (IP+port) from a remote Netcat instance as shown in figure 1. Let’s now dive into the details of Netcat as a tool.Ĭhatting: Netcat can be used for the purpose of chatting from one system to another. Hyphens in port names must be backslash escaped (e.g. Port numbers can be individual or ranges: lo-hi Quit after EOF on stdin and delay of secs Program to exec after connect ĭelay interval for lines sent, ports scanned Listen for inbound: nc -l -p port Īs `-e’ use /bin/sh to exec It provides an environment which is capable of interacting with an attacker and monitors his/her activities without any real resources at risk.įirst of all let’s see all the options provided by nc -hĬonnect to somewhere: nc hostname port … It can emulate various services provided by an OS and also generate responses for those services. Honeypot: A Honeypot is a monitored decoy used to attract attackers away from critical resources and also a tool to analyze an attacker’s methods and characteristics. It is utilized to access services which are restricted in any specific environment.
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Port Redirection: A simple technique used to transfer traffic from one port to another. A simple form of banner grabbing is to send a request and analyze the response received. Once determined, these open ports can be utilized to gain access to the host or to launch an attack.īanner Grabbing: A fingerprinting technique aimed at extract information about a host such as operating system, web server, applications etc. Port Scanning: The act of systematically scanning a host for open ports. Before describing Netcat functionalities in detail, some terms need to be explained briefly: