Mayara S2 Felipe

Mayara S2 Felipe · às 6:30:00 PM

DEFINATION OF HACKING

Hacking is an attempt to exploit a computer system vulnerabilities or a private network inside a computer to gain unauthorized acess.
Hacking is identifying and exploiting weakness in computer system and/ or computer networks for finding the vulnerability and loopholes.

Nmap is a free utility tool for network discovery, port scanning and security auditing, even though we can use it for more than that but in this article we will learn how to do these three things with nmap.

The original author of nmap is Gordon Lyon (Fyodor). Nmap is licensed under GPL v2 and has available ports in many different languages. Nmap is available for Linux, Windows, and Mac OS X. You can download your copy of nmap from their website.

Lets get started with nmap.

When performing pentests we always look for networks we are going to attack. We need to identify live hosts on the network so that we can attack them. There are plenty of tools available for finding live hosts on a network but nmap is one of the best tools for doing this job.

Lets start with simple host (target) discovery scans i,e scans that will tell us which ip address is up on our target network. Those ip addresses which are up on our target network are the ones that are assigned to a device connected on our target network. Every device on the network is going to have a unique ip address.
To perform a simple host discovery scan we use the following command

nmap -v -sn 10.10.10.0/24

flags we used in the above command are
-v for verbose output
-sn to disable port scan (we don't want to scan for ports right now)

Following the flags is the ip address of the target network on which we want to look for live hosts. The /24 at the end of the ip address is the CIDR that specifies the subnet of the network on which we are looking for live hosts.

After running the above command you should get a list of live hosts on your target network.
If you just want to know the list of ip addresses your command is going to scan, you can use the -sL flag of the nmap like this.

nmap -sL 10.10.10.0/24

this command will simply output the list of ip addresses to scan.

We sometimes want to do dns resolution (resolving ip addresses to domain names) when performing our network scans and sometimes we don't want dns resolution. While performing a host discovery scan with nmap if we want to perform dns resolution we use -R flag in our command like this:

nmap -v -sn -R 10.10.10.0/24

And if we don't want to perform dns resolution of hosts during our scan we add the -n flag to our command like this:

nmap -v -sn -n 10.10.10.0/24

After we have discovered the hosts that are up on our target network, we usually put the ip addresses of these hosts into a file for further enumeration.

Next step in our enumeration would be to detect which operating system and which ports are running on these live hosts, for that we run this command:

nmap -O -v 10.10.10.119

here we use -O (capital o not zero) for operating system detection and by default nmap performs SYN Scan for port discovery. However nmap scans for 1000 ports only by default of a particular host.

To make nmap go over a list of ip addresses in a file we use -iL flag like this:

nmap -O -v -iL targetlist

where targetlist is the name of the file which contains ip addresses that we want to perform port scan on.

To make nmap scan all the ports of a target we use the -p flag like this:

nmap -p- -v 10.10.10.121

We can also specify a range of ports using the -p flag like this:

nmap -p1-500 -v 10.10.10.121

here 1-500 means scan all the ports from 1 to 500.

We can use a number of scan techniques to discover open ports on our network but I will only discuss some of them for brevity.

We can perform a TCP SYN scan using nmap with -sS flag like this:

nmap -sS -v 10.10.10.150

We have also flags for TCP connect and ACK scans which are -sT -sA

nmap -sT -v 10.10.10.150

nmap -sA -v 10.10.10.150

We can also perform UDP scan as well instead of TCP scan using -sU flag

nmap -sU -v 10.10.10.150

We can perform TCP Null, FIN, and Xmas scans using the flags -sN, -sF, -sX

nmap -sN -v 10.10.10.150

nmap -sF -v 10.10.10.150

nmap -sX -v 10.10.10.150

If you don't know what these scans are then please visit Port Scanning Techniques and Algorithms for explanation.

After discovering the open ports on our target host, we want to enumerate what services are running on those open ports. To enumerate services and versions information on open ports we use the -sV flag like this:

nmap -sV -v 10.10.10.118

This should give us information about what services are running on what ports and what versions of those services are running on the target host.

nmap has an interesting feature called NSE nmap scripting engine. It allows users to write their own scripts, using the Lua programming language, to automate a wide variety of networking tasks. nmap ships with a diverse set of scripts which are very helpful to enumerate a target. To use the nmap default set of scripts while enumerating the target, we use the -sC flag like this:

nmap -sC -sV -v 10.10.10.118

We can also save the results of our nmap scans to a file using the -o flag like this

nmap -sC -sV -v -oA defaultscan 10.10.10.119

here -oA tells the nmap to output results in the three major formats at once and defaultscan is the name of the file that will be prepended to all the three output files.

This is the end of this short tutorial see you next time.

References:
https://nmap.org/book/scan-methods-null-fin-xmas-scan.html

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Mayara S2 Felipe · às 1:36:00 AM

How To Recover Files That Are Deleted From Recycle Bin

Well, Windows users have a bad habit of removing files from recycle bin. Deleting useless files from Recycle Bin helps a user to save some storage space which can improve the speed of a computer. However, Windows users do that more frequently and later regret. Actually, Recycle Bin is a place from where we can get back our deleted files and folders.

Sometimes, we accidentally delete our important files and folders and due to some reason we lose them from Recycle bin too! At that time, we search for recovery methods. Well, there are many methods available over the web which can help you to recover deleted files from computer, but, when it comes to reliability, nothing can beat EaseUS.

What Is EaseUS Data Recovery Wizard?

EaseUS is one of the leading software providers which is known for its data recovery programme. EaseUS offers some free data recovery software that can help you to recover deleted, formatted or lost data from PC, laptop or removable device easily and quickly.

One of the best thing about EaseUS is that it provides tools for recycle bin recovery which can help you to get back files that you have deleted from the Recycle bin itself. EaseUS Data Recovery Wizard free can easily recover lost files, pictures, documents, videos and more from deleting, formatting, partition loss, OS crash, virus attack and other data loss cases.

How To Recover Deleted Files?

If you are struggling to get back your lost data files, then here is an easy data recovery method which will help you to get back deleted files on your computer. Below, we are going to share a mini guide on how to use EaseUS Recycle Bin Recovery to get back your deleted data.

Step 1. First of all, you need to download and install EaseUS Data Recovery Wizard on your Windows computer and then launch it normally. You need to select the location where you want to scan and then click on 'Scan'

Step 2. Now, wait for few minutes until the tool finishes scanning your drive. The tool search for files that got deleted or cleaned from the Recycle Bin.

Step 3. Now it will show you files that you can recover. Here you need to click on the file which you want to recover and click on 'Recover'

That's it, you are done! This is how you can use EaseUS data recovery to get back your deleted files on your computer.

Benefits of EaseUS Data Recovery

Well, the data recovery tool provided by EaseUS comes with many benefits. It can not only recover accidentally deleted files, but it can also recover data in case of Virus Attacks, Hard Disk Damage, OS Crash etc.

You can also use this awesome data recovery wizard to recover deleted files from External Disk, USB Drive, Camcorder, Mobile Devices, Zip Drive, iPod, Music Player and more.

Overall, this is one of the best data recovery tools you can have on your Windows computer. EaseUS Data Recovery also has a free version with restricted features. Overall, this is a stress-free solution to get back your deleted files

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