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Crowbar - Brute forcing tool

What is Crowbar?

Crowbar (formally known as Levye) is a brute forcing tool that can be used during penetration tests. It was developed to brute force some protocols in a different manner according to other popular brute forcing tools. As an example, while most brute forcing tools use username and password for SSH brute force, Crowbar uses SSH key(s). This allows for any private keys that have been obtained during penetration tests, to be used to attack other SSH servers.

Currently Crowbar supports:

Installation

Kali Linux users can do

# sudo apt install -y crowbar

Else if you wish to install from source, install all the dependencies:

Debain 9/10+ & Kali Rolling

# sudo apt install -y nmap openvpn freerdp2-x11 tigervnc-viewer   python3 python3-pip

Debain 7/8 & Kali 1/2

# sudo apt-get install -y nmap openvpn freerdp-x11 vncviewer

Then get latest version from GitHub:

# git clone https://github.com/galkan/crowbar
# cd crowbar/
# pip3 install -r requirements.txt

Note: The RDP client package depends on your OS:

Don't forget to patch ./lib/main.py to point to the new binary!

Usage

If you want see all usage options, please use: ./crowbar.py --help.

ATTENTION: If you want to use username including DOMAIN, please specify username like below. Backslash (\) is the escape character for python. So you have to use either of the following two formats:

# ./crowbar.py -b rdp -u DOMAIN\\gokhan alkan -c Aa123456 -s 10.68.35.150/32
2015-03-28 11:03:39 RDP-SUCCESS : 10.68.35.150:3389 - "DOMAIN\gokhan alkan":Aa123456,

# ./crowbar.py -b rdp -u gokhan alkan@ornek -c Aa123456 -s 10.68.35.150/32
2015-03-28 11:04:00 RDP-SUCCESS : 10.68.35.150:3389 - "gokhan alkan@DOMAIN":Aa123456,

Demonstration Videos

Brute Forcing - Remote Desktop Protocol (RDP)

Below are a few examples of attacking RDP using Crowbar.

RDP brute forcing a single IP address using a single username and a single password:

# ./crowbar.py -b rdp -s 192.168.2.182/32 -u admin -c Aa123456

RDP brute forcing a single IP address using username list file and a single password:

# ./crowbar.py -b rdp -s 192.168.2.211/32 -U ~/Desktop/userlist -c passw0rd

RDP brute forcing a single IP address using a single username and a password list:

# ./crowbar.py -b rdp -s 192.168.2.250/32 -u localuser -C ~/Desktop/passlist

RDP brute forcing a subnet using a username list and a password list in discovery mode:

# ./crowbar.py -b rdp -s 192.168.2.0/24 -U ~/Desktop/userlist -C ~/Desktop/passlist -d

Brute Forcing - SSH Private Keys

Below are a few examples which you have using Crowbar.

SSH key brute force attempt to a single IP address using a single username and a single private SSH key:

# ./crowbar.py -b sshkey -s 192.168.2.105/32 -u root -k ~/.ssh/id_rsa

SSH key brute force attempt to a single IP address using a single username and all the SSH keys in a folder:

# ./crowbar.py -b sshkey -s 192.168.2.105/32 -u root -k ~/.ssh/

SSH key brute force attempt to a subnet using a single username and all the SSH keys in a folder in discovery mode:

# ./crowbar.py -b sshkey -s 192.168.2.0/24 -u root -k ~/.ssh/ -d

Brute Forcing - VNC

Below is an example of attacking a VNC service using Crowbar.

VNC brute force attempt to a single IP address using a password file with specified port number:

# ./crowbar.py -b vnckey -s 192.168.2.105/32 -p 5902 -k ~/.vnc/passwd

Brute Forcing - OpenVPN

Below is an example of attacking OpenVPN using Crowbar.

OpenVPN brute force attempt to a single IP address using a configuration file, a single username and a single password with specified port number and optional certificate file. Doesn't matter if its TCP or UDP:

# grep remote ~/Desktop/vpnbook.ovpn
remote vpn.example.com 1194 udp
# host vpn.example.com | awk '{print $1}'
198.7.62.204
# grep '^auth-user-pass' ~/Desktop/vpnbook.ovpn
# ./crowbar.py -b openvpn -s 198.7.62.204/32 -p 1194 -m ~/Desktop/vpnbook.ovpn -k ~/Desktop/vpnbook_ca.crt -u vpnbook -c cr2hudaF

Logs & Output

Once you have executed Crowbar, it generates 2 files for logging and result that are located in your current directory. Default log file name is crowbar.log which stores all brute force attempts while execution. If you don't want use default log file, you should use -l log_path. The second file is crowbar.out which stores successful attempts while execution. If you don't want use default output file, you should use -o output_path. After that you can observe Crowbar operations.

You can make the output more verbose by doing -v, or even more information can be shown with -vv. If you're trying to troubleshoot an issue or potential bug, using -D will enable debug mode and will give a lot more output.

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