Hash Cracking with Free GPU

Hashcat installation on Google colab with Tesla K80

Google Colaboratory is a free Jupyter notebook environment that requires no setup and runs entirely in the cloud.

With Colaboratory you can write and execute code, save and share your analyses, and access powerful computing resources, all for free from your browser. Welcome to Colab

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Mount to Google Drive

from google.colab import drive
drive.mount('/content/gdrive')

Connection to Google Colab with SSH on NGROK

#Generate root password
import random, string
password = ''.join(random.choice(string.ascii_letters + string.digits) for i in range(19))

#Download ngrok
! wget -q -c -nc https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-amd64.zip
! unzip -qq -n ngrok-stable-linux-amd64.zip
#Setup sshd
! apt-get install -qq -o=Dpkg::Use-Pty=0 openssh-server pwgen > /dev/null
#Set root password
! echo root:$password | chpasswd
! mkdir -p /var/run/sshd
! echo "PermitRootLogin yes" >> /etc/ssh/sshd_config
! echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config
! echo "LD_LIBRARY_PATH=/usr/lib64-nvidia" >> /root/.bashrc
! echo "export LD_LIBRARY_PATH" >> /root/.bashrc

#Run sshd
get_ipython().system_raw('/usr/sbin/sshd -D &')

#Ask token
print("Copy authtoken from https://dashboard.ngrok.com/auth")
import getpass
authtoken = getpass.getpass()

#Create tunnel
get_ipython().system_raw('./ngrok authtoken $authtoken && ./ngrok tcp 22 &')
#Print root password
print("Root password: {}".format(password))
#Get public address
! curl -s http://localhost:4040/api/tunnels | python3 -c \
    "import sys, json; print(json.load(sys.stdin)['tunnels'][0]['public_url'])"

SSH Keygen

!ssh-keygen -t rsa
%cd /root/.ssh/
!cat id_rsa.pub >> authorized_keys && chmod 600 authorized_keys && cat id_rsa 

Hashcat Installation

ls /usr/bin/ | grep -i hash

Check hashcat files with the command and delete the files.

wget https://hashcat.net/files/hashcat-5.1.0.7z
sudo apt install p7zip
sudo p7zip -d hashcat-5.1.0.7z
cd hashcat-5.1.0
ls /usr/bin/ | grep -i hash			##check
sudo cp hashcat64.bin /usr/bin/
sudo ln -s /usr/bin/hashcat64.bin /usr/bin/hashcat	
sudo cp -Rv OpenCL/ /usr/bin/
sudo cp hashcat.hcstat2 /usr/bin/
sudo cp hashcat.hctune /usr/bin/

Hashcat Benchmark