Telnet is the basic hacking tool, which every hacker must know how to use before he can even think about Hacking. It can be used to connect to remote computers and to run commands by simply typing them in it's
window.Telnet does not use the resources of the client's computer but uses the resources of the server to which the client has connected.
Basically it is a program that you will be using to connect to your victim's computer. It just requires that you and your victim are both connected to the internet.
How can I connect to a remote computers using telnet?
Telnet can be started by going to start -> run and typing telnet Once the Telnet windows pops up click on Connect->RemoteSystem then in the host name type the host i.e. the IP address of the remote computer or
the website you want to connect to . Then in the Port select the port you want to connect to . You can only connect to ports which are open on the host computer.Almost always leave the TermType to vt100.We use
vt100 as it is compatible with most monitors . Then click connect and you will be connected to the remote machine in some time.
The syntax of the telnet command from DOS prompt is
C:\>telnet
By default port is taken as 23. Scroll down and read more about ports.
What is an IP Address?
Like in this world , everyone has a Home Address so that he can be contacted on that address , similarly all computers connected to the Internet are assigned a unique Internet Protocol or IP address which
can be used to contact that particular computer. An IP is simply the address of a particular computer . Every computer connected to the internet has a differnet IP address.
An IP address is of the form: xxx.xxx.xxx.xxx .You can find your own IP by going to start->run and typing winipcfg.If you need to connect to a your friend's computer then you need the IP address of his computer . There are many ways of finding out the IP address of a person's computer without letting him know.
Ping : 7
Systat : 11
Time : 13
NetStat : 15
SSH : 22
Telnet : 23
SMTP : 25
Whois : 43
Finger : 79
HTTP : 80
POP : 110
You can connect to a remote computer at a particular port. When you are connected to that port then you can interchange information related to that particular port only. Ports can be open or closed. If a particular
port of a computer is closed then you can not connect to that computer on that port. Generally most of the computers have atleast 5 or 6 ports open.
Whats a Daemon?
A daemon is a program that runs at ports. You can consider it to be a software that manages the flow of information through the port . All the ports can have different daemon / services running on them.
Port Scanning ?
It is the first step in finding a hackable server running a daemon. Like softwares can have bugs , similarly daemons can have a hole or a vulnerability .A hacker can utilize this hole for his purpose.
Say you want to hack into someone's server , what do you do ? You need the IP address of the computer you want to connect to . This is the first basic step . Once you have the IP , you need to know
which port is open so that you can connect to it . Every port may not be open so you need to find out a list of open ports which are running a daemon.Once you have the list of open ports on the victims computer then you can connect to any one of those ports .For this purpose we have port scanners. You just need to feed the IP address into the port scanner and it will give you the list of all the open ports of that IP.Some port scanners,alongwith the list of open ports also gives the service running on each port and its vulnerabilities.
Once you have got the list of open ports then connect to each of them one by one and see what daemon or service they are running.
But one thing you need to be careful about before port scanning is that most port scanners are very easily detected and can easily be traced and you have no excuse if you are caught doing a port scan.
It a sure sign of Hacker Activity and if the host is running the right kind of Sniffer software maybe Etherpeek then the Port scan can be easily detected and the IP of the user logged . Once your IP is logged then you can be easily traced thru you internet service provider, so be careful with port scanning.
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