Banner are refers as text message that received from host. Banners
usually contain information about a service, such as the version number.
Banner grabbing is
a process to collect details regarding any remote PC on a network and the
services running on its open ports. An attacker can make use of banner grabbing
in order to discover network hosts and running services with their versions on their
open ports and more over operating systems so that he can exploits it.
Nmap
A simple banner grabber which connects to an open TCP
port and prints out anything sent by the listening service within five seconds.
The banner will be shortened to fit into a single
line, but an extra line may be printed for every increase in the level of
verbosity requested on the command line.
Type following command which will fetch banner for
every open port in remote PC.
nmap -sV --script=banner 192.168.1.106
From screenshot you
can read the services and their version for open ports fetched by NMAP Script
to grab banner for the target 192.168.1.106
Following
command will grab the banner for selected port i.e. 80 for http service and version.
nmap -Pn -p 80 -sV --script=banner
192.168.1.106
As result it
will dumb “http-server-header: Apache/2.2.8 (Ubuntu) DAV/2”
CURL
Curl –I is
use for head in order to shown document information only; type following
command to grab HTTP banner of
remote PC.
curl -s -I 192.168.1.106 | grep -e
"Server: "
As result it
will dumb “http-server-header: Apache/2.2.8 (Ubuntu) DAV/2”
TELNET
Type
following command to grab SSH banner
of remote PC.
telnet 192.168.1.106 22
As result it
will dumb “SSH-2.0-OpenSSH_4.7p1 Debian-8ubuntu1”
Type
following command to grab SSH banner
of remote PC.
nc –v 192.168.1.106 22
As result it
will dumb “SSH-2.0-OpenSSH_4.7p1 Debian-8ubuntu1”
DMitry (Deepmagic Information
Gathering Tool) is a UNIX/(GNU)Linux Command Line Application coded in C.
DMitry has the ability to gather as much information as possible about a host.
Base functionality is able to gather possible subdomains, email addresses,
uptime information, tcp port scan, whois lookups, and more.
Dmitry –b is use for banner grabbing for all open ports; Type following
command to grab SSH banner of remote
PC.
dmitry -b 192.168.1.106
From screenshot you can see it has
shown banner for open port 21, 22, 23
and 25.
In this way Attacker can grab the
services and their version for open ports on remote PC.
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