Another uses for net cat.
It's two grabs a banner and what I mean by grabbing them and banner whenever we try to connect to an
open port on another machine that has a service it will display some information about the service and
this can be very helpful for any hacker to identify as a product or the software that is running on
this machine and try to find the vulnerability.
Let me give you a small example assumes that I scanned the Windows machine from my Kelly Linux machine
and I noticed that they have put twenty one open will talk about scanning later on but the point is
assumes that they have this piece of information and I know that port 21 usually is used for FTB so
I need to know what product that or what FCP service or software they are using so I can start searching
for any weakness or verbal ability so I can type that NC netiquette and then the windows IP which is
1 2 1 0 9 and then support 20 not 21.
So I'm asking to connect to this specific computer support 21 that I know that it's open and 1C.
I don't have I don't need to have a user name and password because what happened is whenever I try to
connect to support a banner would be showing is sending you welcome to ability server to point to three
two point two.
So just by doing that I know now that the Windows machine has this server with this version so I can
start search for any further ability related to this to such service.
If I didn't do that I know that he got an FTB server running except I don't know what product he's using
or which version he's using.
So this is called a banner grabbing it's not requesting or it doesn't need any user name or password
you just try to connect using Netscape and from the banner you can get some useful information as you
saw.