what is banner grabbing
many people asks questions like this:
what is banner grabbing?
if you talk about banner grabbing, it refers as Banner grabbing is the act of capturing the information provided by banners, configurable text-based welcome screens from network hosts that generally display system information and their tipes and how they works. Banners are intended for network administration or network administraters which is use to captcher data.
banner grabbing tools
ID Serve can always identify the model, and version of any website’s server software.
it can also identify on which version the website is running, by giving its specific info like monitering info etc.
Some examples of service ports used for id serve banner grabbing are those used by Hyper Text Transfer Protocol (HTTP), File Transfer Protocol (FTP), and Simple Mail Transfer Protocol (SMTP); ports 80, port 21, and port number 25 respectively.
This simple tool reads and writes data across TCP or UDP network connections. It is designed to be a reliable backend tool to use directly or it is easily driven by other programs and scripts. At the same time, it is a feature rich network debugging and exploitation tool, since it can create almost any kind of connection you would need, including port binding to accept incoming connections etc.
now you maby thinking: Oh,! SHODAN is a search engine?
how it can be use in banner grabbing?
let me tell you, how it works:
SHODAN combines an HTTP port scanner with a search engine index of the HTTP responses, making it tricky to find specific web servers. Shodan collects data mostly on web servers at the moment (HTTP port 80), but there is also some data from FTP (port 21), SSH (port 22) Telnet (port 23), SNMP (port 161) and SIP (port 5060) services..
banner grabbing using telnet
You can telnet to hosts on the default telnet port (TCP port 23) to see whether you’re presented with a login prompt or any other information.
let us move forward into the post with an example
Just enter the following line at the command prompt in Windows or UNIX
You can also telnet to other commonly used ports with these commands:
SMTP: telnet Target_ip_address 25
HTTP: telnet Target_ip_address 80
banner grabbing using nmap
Nmap (Network Mapper) is a security scanner, originally written by Gordon Lyon (also known by his pseudonym Fyodor Vaskovich), used to discover hosts and services on a computer network, thus building a “map” of the network.
The nmap command to use which will scan all open ports and report banners is:
$ sudo nmap -sV [target]
$ nmap -sV targethost.com
these were some of the banner grabbing tools.
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