P0f is a tool that utilizes an array of sophisticated, purely passive traffic fingerprinting mechanisms to identify the players behind any incidental TCP/IP communications (often as little as a single normal SYN) without interfering in any way.
Ettercap is a comprehensive suite for man in the middle attacks. It features sniffing of live connections, content filtering on the fly and many other interesting tricks. It supports active and passive dissection of many protocols and includes many features for network and host analysis.
Nmap is a free and open-source utility for network discovery and security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime.
Xprobe2 is an active OS Fingerprinting tool with a different approach to operating system fingerprinting. Xprobe2 relies on fuzzy signature matching, probabilistic guesses and multiple simultaneous matches, and a signature database.
Before attack you should know OS of a remote machine. Once target machine OS known, it will be easy to determine the vulnerabilities which can exploit target machine.
First You Check If nmap is installed on your system using
If not,then installed it using-
└─$ sudo apt-get install nmap
Below nmap command is used to know operating system serving the website and the open port within this website.
└─$ sudo nmap -O -v fresherbell.tk
This Command list down all open port
Hacker can use different attack technique through open port.
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