pyvmx-cracker

October 3, 2018 · View on GitHub

Based on the VMwareVMX module, this tool aims to crack VMX encryption passwords. This tool crack the password by successfully decrypting the dict structure. If you want to fully decrypt the VMX structure, check the VMwareVMX module.

Description

The VMX files (.vmx) contains the virtual machine informations, VMware VMX configuration files are encrypted when the virtual machine is encrypted. Here is a sample from an encrypted VMX file :

.encoding = "UTF-8"
displayName = "Encrypted"
encryption.keySafe = "vmware:key/list/(pair/(phrase/MA3fCocdhNc%3d/pass2key%3dPBKDF2%2dHMAC%2dSHA%2d1%3a
cipher%3dAES%2d256%3arounds%3d1000%3asalt%3d9kxr%2bxeqo4xPz9ttPZUVFA%253d%253d,
HMAC%2dSHA%2d1,X4sG4nJc0yeWAaSkBllAPI4nCrbO2RUE8dXHa82I4KmfNO7JjruuCrWgRRT6EUQHGQP%2bTDjPFSLHZ
s%2bwRpFZXpjyWvJkzwFhx7UJGQriz3SCXWlwrz1zNPYAmqSXiusyFiY4js0CdabNfdFQKtLy79jDuP0%3d))"
encryption.data = "..."

The KeyStore is a simple structure, and it contains the information needed by the machine to verify the password each time the user wants to start a machine or change its password. Here are some information about the KeySafe structure :

Name	Description
id	Identifier must be 8 bytes long and is just a random number
password_hash	Only PBKDF2-HMAC-SHA-1 algorithm for the password is supported
password_cipher	Only AES-256 encryption algorithm for the dictionary is supported
hash_round	Hash rounds
salt	The salt parameter is used with the password for the PBKDF2-HMAC-SHA-1
config_hash	Only HMAC-SHA-1 hash algorithm for the configuration is supported
dict	Dictionary (starts with 'type=key:cipher=AES-256:key=' when successfully decrypted)

Requirements

This tool requires the pyCrypto module. You can install it from the requirements file :

$ pip3 install -r requirements.txt

You also can install it directly :

$ pip3 pip install pyCrypto

Install

Checkout the source: git clone https://github.com/axcheron/pyvmx-cracker.git

Getting Started

$ python3 pyvmx-cracker.py
usage: pyvmx-cracker.py [-h] [-v VMX] [-d DICT]

Simple tool to crack VMware VMX encryption passwords

optional arguments:
  -h, --help            show this help message and exit
  -v VMX, --vmx VMX     .vmx file
  -d DICT, --dict DICT  password list

$ python3 pyvmx-cracker.py -v sample.vmx -d wordlist.txt
Starting pyvmx-cracker...

[*] KeySafe information...
        ID = 300ddf0a871d84d7
        Hash = PBKDF2-HMAC-SHA-1
        Algorithm = AES-256
        Config Hash = HMAC-SHA-1
        Salt = f64c6bfb17aaa38c4fcfdb6d3d951514

[*] Starting bruteforce...
        9 password tested...
        20 password tested...
        40 password tested...
        111 password tested...
        128 password tested...
        136 password tested...
        140 password tested...
        154 password tested...
        180 password tested...
        209 password tested...

[*] Password Found = Password123

Resources

Here are some interesting resources about this project :

https://github.com/RF3/VMwareVMX

License

This project is released under the MIT License. See LICENCE file.