Wireless Hacking: Introduction to Wireless Hacking with Kali Linux (2017)
Speeding up WEP Hacking: ARP request replay attack
First, you can buy a new external wireless adapter. Secondly, you can side install Kali with Windows or run it via a USB. A virtual machine can only use computer hardware if it is externally connected via USB. Now there is another catch here. The internal adapters, almost all of them, don't support injection. This is extremely important for speeding up wireless hacking. So if you really want to go in depth of wireless hacking, then its time to buy an external adapter or two (the more the better). If that's not a possibility, you might want to spend hours trying to get a driver which might make your internal adapter support injection (I don't know anyone who succeeded in this, but it might be possible).
Check Injection Support
Aircrack-ng has a comprehensive article related to checking injection support. You might check their website out for it. I am just providing the commands which will be enough to find out whether injection is working or not.
airmon-ng start wlan0 [or wlan1]
(Puts your wireless adapter in monitor mode. From now we'll refer to wlan0/wlan1 as mon0
airserv-ng -d mon0 aireplay-ng -9 127.0.0.1:666
This basically sets up a “temporary server” that is waiting for you to test your injection capabilities. The second command actually tries to inject the server, and succeeds. 127.0.0.1 is the IP which is reserved for loopback. It is always used when you are carrying out some command on yourself. 666 is the port we are using. Most of the time, what follows an IP and a colon is the port. The general form is somewhat like IP:port. So finally you have checked your injection capabilities, and the last line "Injection is working!" will confirm it.
Check Signal Strength
While the basic hacking methods from the previous chapter don't have any real strength restriction, you need to be physically close to the access point in order to inject packets. There is information regarding the same in the same aircrack-ng tutorial. Again, I'm gonna summarize what you have to do here.
First, we will use airodump-ng mon0 to see the list of networks in range. See the one you want to hack:
Airodump-ng lists the networks in range.
Now we will hack the digisol network. Make a note of the BSSID of the network you want to hack. A good practice is to store all the information gathered in any text editor. We should, at this stage, take a note of following:
• ESSID - DIGISOL
• BSSID - 00:17:7C:22:CB:80
• CH (channel) - 2
• Mac address of genuine users connected to the network:
• Interface : wlan1 - referred to as mon0
You should gather the equivalent information for the network you will be working on. Then just change the values whenever I use them in any of the commands
Note : We need at least one user (wired or wireless) connected to the network and using it actively. The reason is that this tutorial depends on receiving at least one ARP request packet and if there are no active clients then there will never be any ARP request packets.
Now, to check whether the signal strength will be sufficient, we will simply execute the following code
airodump-ng [interface] -c [channel]
airodump-ng mon0 -c 2
This will make the wireless card only read packets in the channel no. 2, on which our target network is.
Now to test the network, type the following code:
aireplay-ng --test -e DIGISOL -a 00:17:7C:22:CB:80 mon0
The last time we checked whether the wireless card had the capability to inject packets. We tested it on our own computer. This time, we actually injected packets into the target computer. If this worked, then it's pretty good news, and it means that you are most probably going to be able to hack this network. The last line 30/30 : 100% determines how good the strength of the signal is. A very high percentage is a good sign, and 100 is ideal.
Now we have already run airodump-ng a couple of times. However, this time we will pass the -w command which will instruct airodump-ng to save the output to a file:
airodump-ng -c [channel] --bssid [bssid]-w [file_name] [interface]
airodump-ng -c 2 --bssid 00:17:7C:22:CB:80 -w dump mon0
The output will be saved in a file dump-01.cap
Now we can keep this terminal running and it will keep saving the packets. [In the previous tutorial we did only 2 things, capture the packet, i.e this step, and crack it, i.e. the step we are going to do last. While it makes our work easier to just follow two steps, it also makes the process much more time consuming, since we are simply a passive packet listener, who is not doing anything]
Speeding Things Up
Now to speed things up, we will inject the network. We will thus obtain ARP packets. These packets will fill up the data column of our airodump-ng capture, and data is what will help us obtain the password. As soon as we have 10000 data packets, we can start attempting to get the password using aircrack-ng.
Now to make the AP pay attention to your injected packets, you either have to be a connected client, or have to pretend to be one. You can either mask your mac address to one of the already connected clients, or use the fake authentication feature. We will do the latter. (If you see an error like the AP is on channel x and mon0 is on channel y then go to the bottom of the chapter for troubleshooting):
aireplay-ng -1 0 -e DIGISOL -a 00:17:7C:22:CB:80 mon0
ARP request replay mode
ARP packets are your best bet at getting a lot of IVs or data. Without IVs you can't hack a network. Enter the following code to make aireplay-ng listen to the AP for ARP packets, and inject them as soon as they find one. This will create a lot of data very fast. This is the real speeding step.
aireplay-ng -3 -b [BSSID] mon0
This is what the final code will look like:
aireplay-ng -3 -b 00:17:7C:22:CB:80 mon0
Now you'll have to wait for some time till it gets an ARP request. As soon as it gets one, the terminal will sort of explode. And the data packets will start filling in with Godspeed. Now this is the part where an active user on the network is absolutely necessary.
After some time I had enough packets to crack almost any network
Cracking the network
Cracking the network is as easy as typing the following into the console
In our case, the command will be:
After pressing enter, you will have a list of networks and you'll be prompted to select which one of them to hack. In my case there was just one network, so I couldn't get that screen, or a screenshot. The password was cracked in less than a second.
So finally you have obtained the password of the network you were trying to hack.