wpa cracking with oclhashcat-plus

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CAPTURING THE WPA HANDSHAKE =============== To start the process of capturing the handshake first place the wireless interface in monitor mode using airmon-ng; airmon-ng airmon-ng start wlan0 and then fire up airodump with options to focus only on your target AP, in my case ; airodump-ng mon0 -c 11 -t wpa -d 98:FC:11:8E:0E:9C -w capture

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Page 1: WPA Cracking With OclHashcat-Plus

CAPTURING THE WPA HANDSHAKE===============To start the process of capturing the handshake first place the wireless interface in monitor mode using airmon-ng;

airmon-ngairmon-ng start wlan0

and then fire up airodump with options to focus only on your target AP, in my case ;

airodump-ng mon0 -c 11 -t wpa -d 98:FC:11:8E:0E:9C -w capture

Page 2: WPA Cracking With OclHashcat-Plus

When the handshake is captured, either by patiently waiting for a client to connect, or by forcing aconnected client to disconnect/reconnect with for instance aireplay-ng, this will be noted at the top right hand side of the airodump window.We can then stop airodump and verify that the handshake is captured with aircrack ;

aircrack-ng capture-01.cap

Now we have our .cap file with 4-way handshake, we need to convert it to .hccap format so that wecan use oclHashcat on it.To do this we use the -J option in aircrack ;(again, this option only available in the later aircrack builds, not in the stock install on BT5R1)

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aircrack-ng capture-01.cap -J capture

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Now we have our .hccap file, I will be switching to my Win7 PC for the actual oclHashcat cracking.(yeah yeah..I know.. a bit of a fail... ;) )

OCLHASHCAT-PLUS===============First of course to download the latest oclHashcat-plus (at time of writing 06-02-2012 v0.07) if you haven't already done so and extract it to where you want, I extracted all files to ;c:\oclHashcat\

Open up the command prompt ;Start --> Run --> cmdAnd move to the directory where you extracted the oclHashcat files to, in my case ;

cd c:\oclHashcat

I am running a 64bit Windows 7 system with an nVidia card (CUDA) so I need to run the cudaHashcat-plus64.exe file, with --help for further info ;

cudaHashcat-plus64.exe --help

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All the info may seem somewhat overwhelming, it certainly did to me, so herewith just a couple ofexamples on how it can be used.

I copied the capture.hccap previously created to the oclHashcat directory on the Windows system as'capture_fubar.hccap'

DICTIONARY ATTACK===============I will be using the rockyou dictionary as an example as it is a fairly large one, and copied the rockyou.txt file to the oclHashcat directory for easy access.

To start the crack, we need to specify ;> The version of oclHashcat we need to use in my case the 64bit version for cuda enabled cards, for ATI cards, you would use the ocl version.> -m [hash type #] in this case '2500' which is used for WPA/WPA2.> The path to the hash file / hccap file in this case 'capture_fubar.hccap' in the same directory.

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> The path to the dictionary we are using for the attack in this case 'rockyou.txt' in the same directory.

cudaHashcat-plus64.exe -m 2500 capture_fubar.hccap rockyou.txtPress 's' to get an updated status report (I hit enter first to create as space between status reports)

oclHashcat went through over 11,5million passphrases in 2min15sec at around 54k passphrases a second..

Page 8: WPA Cracking With OclHashcat-Plus

Increasing the load on the GPU with the -n option can increase performance and the number of passphrases checked per second ;

cudaHashcat-plus64.exe -m 2500 -n 80 capture_fubar.hccap rockyou.txt

So with the increased load on the GPU it went from around 54k passphrases/sec to around 64k passphrases/sec.

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MASK (BRUTEFORCE) ATTACK===============

From what I read oclHashcat-plus is not yet able to mask bruteforce in increments (so first testing 8 characters then 9, then 10 etc) so you need to test that manually.However not completely sure on the bruteforce options to be honest as I see in the WIKI there are specificbruteforce options mentioned, but I can't seem to get that working as of yet.Reading up ;)

The masked bruteforce attack works by defining character sets to use (if custom character sets are required),and then uses the masks to define in which position in the passphrase the charsets should be used.

There are various predefined charsets, among which ;?l -- lower case alpha?u -- upper case alpha?d -- numeric values?s -- special characters including space

To start a mask / bruteforce attack, you need to specify ;

> The version of oclHashcat you need to use> -m [hash type #] > -a [attack mode #] > The custom character sets (if any).> The path to the hash file / hccap file.> The mask to use.

The mask used has to match the length of the password, so if testing for a 8 digit passwordyou have to enter 8 mask entries.

If for instance testing all uppercase values for an 8 character password ;

cudaHashcat-plus64.exe -m 2500 -a 3 capture.hccap ?u?u?u?u?u?u?u?u

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If testing for numeric values only for an 8 character password ;

cudaHashcat-plus64.exe -m 2500 -a 3 capture.hccap ?d?d?d?d?d?d?d?d

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If we know that for an 8 digit password the 1st 4 digits of the password are numeric values and the last 4 digits are upper case values, then you would specify that as follows ;

cudaHashcat-plus64.exe -m 2500 -a 3 capture.hccap ?d?d?d?d?u?u?u?u

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CUSTOM CHARSETS

You can define upto 4 custom charsets to be used, this is done by using the switches ;-1, -2, -3, -4

So thinking of our above dictionary crack, for the sake of argument, lets say we know the passphraseused is a 4 digit number only containing the numbers 1 2 3 4 followed by 6 upper case values only containing the letters Y T R E W Q.

We could create a custom charset containing the numbers 1234 and specify these to be used for thefirst 4 digits of the passphrase.and also create a second custom charset containing YTREWQ and specify these to be used for the last 6 digits of the passphrase.In the mask you would then specify where to use the 1st custom charset and where to use the 2nd custom charset with ?1 for the 1st custom charset and ?2 for the 2nd custom charset as follows ;Of course this is not a terribly realistic scenario .. but hey, you get the idea..

cudaHashcat-plus64.exe -m 2500 -a 3 -1 1234 -2 YTREWQ capture_fubar.hccap ?1?1?1?1?2?2?2?2?2?2

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If you were to actually know that the first 4 digits of the passphrase are '1234' followed by 6 uppercase alpha values then you can define the 1st 4 values of '1234' directly in the mask ;

cudaHashcat-plus64.exe -m 2500 -a 3 -n 80 capture_fubar.hccap 1234?u?u?u?u?u?u

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