Download Dear Readers, Welcome to this very special issue of Hakin9. For the second time we will be touching a very controversial subject — scanning with nmap. We are going to suprise everyone with plethora of fascinating content that will make your head spin. We wish you a nice read.
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Download Dear Readers, Welcome to this very special issue of Hakin9. For the second time we will be touching a very controversial subject — scanning with nmap. We are going to suprise everyone with plethora of fascinating content that will make your head spin. We wish you a nice read. Nmap has advanced features that can detect different applications running on systems as well as services and OS fingerprinting features. Back in , namp was a Linux only utility, but today is a cross-platform, lightweight network security scanner.
To accomplish this, Nmap will send crafted packets to the host and then use the response to get information about it. NMAP can be used to determine the operating system of host, the names and versions of the services, estimated up time, type of device, and presence of a firewall. Nowadays it is a great set of tools with extensible framework, providing opportunity to integrate it with external scripts.
You can get information about all features and a distributive at official www. NMAP definitely has held its reputation as being a go-to tool when network analyst and security researchers need it. The developing trends of ethical hacking and offensive security have transformed the information security industry into one of the most self-perpetuating industries in the world.
The software and tools that are used to secure vulnerable information assets are the same tools that can be used to exploit them.
Perhaps the tools that were created for the sole purpose of exploiting information assets are now being used to safeguard them. I say nmap is relatively easy to get using, but take that with a grain a salt.
As you can see in the screen capture below, by running nmap —help, we are presented with a wealth of option flags for our use.
The main aim of this software is to perform host and services discovery and network recognisance. The initial release written by Gordon Lyon also known as Fyodor Vaskovich if you watch Defcon talks was back in September of Fyodor keeps the NMAP project rolling which today gives us version 6.
You can use Nmap to scan entire network with a simple line of command or just an individual host. To the casual observer, Nmap is just a network port scanner. However it is a powerful toolkit comprising of many useful utilities commands and GUI. This instructional will guide you through using Nmap to effectively scan a subnet for live hosts, determine the status of firewall ports, iterate through running services and identify vulnerabilities.
It was designed for large networks, but works on single hosts as well. It runs on all major Operating Systems and in addition to the classic command-line Nmap executable, it also includes an advanced GUI and results viewer Zenmap. We all have our firewalls configured to prevent pretty much all inbound traffic with a few exceptions , and we know what outbound traffic to allow: http, https, ssh, smtp, pop, etc.
And you know that when a hacker manages to land a trojan or install a backdoor in your network, the command and control outbound traffic will be via http or https most of the time.
You should be doing outbound traffic analysis, but you can. While this may work for small networks, it does not scale for larger networks or more thorough assessments. The astute reader will notice that options a, b, and c, operate identically. Option a provides the network range in CIDR notation and since -sS is the default scan type when no options are supplied—option b is identical to option a. Examining option c, reveals that it is the same as options a and b, except that the target is supplied using a network range instead of CIDR notation.
The problem with options a, b, and c is that they will not thoroughly scan the remote class c network as they will only scan the top TCP ports. Option d is close to what we are looking for since it scans all of the TCP ports; however, it lacks efficiency since we will be scanning all ports on all hosts, including dead IP space.
I would like to enlighten a quick and dirty aproach to get an portscan detectorup and running to add to your defense in depth. In this tutorial we will install the portscan attack detector deamon. Or psad for short. PSAD is capable of automatically add iptables rules in order toblock all traffic to and from one or more portscanning ip-addresses.
There are not that many hands-on websites dealing with psad for a specific linux distro. And the ones who exist miss some essential details to get things working. There are a lot of tools and areas where digital forensic can be applied, and thousands of tools that can be used.
How to Use Nmap: Commands and Tutorial Guide
Nmap has advanced features that can detect different applications running on systems as well as services and OS fingerprinting features. In most cases, I find that this does not often matter because rarely are the logs reviewed, but if they are then a key advantage of the penetration tester is lost — stealth. Using Nmap Nmap is available on almost all operating systems. It can be downloaded and installed on Windows, OS X, Linux, and even jailbroken and rooted mobile devices. Installing Nmap is pretty simple. On most Debian based Linux systems you can open up a terminal window and type in the command: sudo apt-get install nmap Many systems come with Nmap preinstalled; therefore you can just start using the program. For the purposes of this article we will assume Nmap on Backtrack 5 RC3 is being used.
Nmap Cheat Sheet
At its core, Nmap is a network scanning tool that uses IP packets to identify all the devices connected to a network and to provide information on the services and operating systems they are running. The program is most commonly used via a command-line interface though GUI front-ends are also available and is available for many different operating systems such as Linux, Free BSD, and Gentoo. Its popularity has also been bolstered by an active and enthusiastic user support community. Nmap was developed for enterprise-scale networks and can scan through thousands of connected devices. However, in recent years Nmap is being increasingly used by smaller companies.
NMAP GUIDE REVISITED – HAKIN9 TUTORIALS
The Hakin9 magazine publishes an Nmap guide this month. The best article is the first one, which Hakin9 apparently published without even reading. And they told me I could post it as a sample of their work. Plus it is full of text like: "Our experiments soon proved that exokernelizing our fuzzy Knesis keyboards was more effective than making autonomous them, as previous work suggested. Our experiments soon proved that microkernelizing our PDP 11s was more effective than exokernelizing them, as previous work suggested. We note that other researchers have tried and failed to enable this functionality.