Rdp Brute Force Tool

Apr 07, 2013  I have an iplist and when I scan those IPs by brute force tools (crowbar, hydra and ncrack) I get the rdp-success message for some server credentials. And then I go to remmina to connect a server as manual but I cannot log on none of them. It says user credentials are not true. What is the problem. Do you have any idea? We did some lab testing and found that within 60 minutes our machines on the internet were found and were seeing SSH brute force. RDP attacks started around the 90 minutes mark. If you have endpoint logs, done! It is easy to search them for failed RDP attempts and gather the outside IP addresses where they are originating from.

Crowbar - Brute forcing tool

Demonstration Videos

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:

• OpenVPN (-b openvpn)
• Remote Desktop Protocol (RDP) with NLA support (-b rdp)
• SSH private key authentication (-b sshkey)
• VNC key authentication (-b vpn)

Installation

Install all the dependencies:

Then get latest version from GitHub:

Note: The RDP client package depends on your OS:

• Debian 7/8 & Kali 1/2 uses freerdp-x11 package.
• Else you can try xfreerdp.
• Else you may need to compile & tweak freerdp by following: http://opentechnotes.blogspot.co.uk/2015/02/compile-headless-freerdp-credential-checking.html

Don't forget to edit the script to point to the new binary!

Usage

-b: Target service. Crowbar supports: openvpn, rdp, sshkey, vnckey

-c: Static password to login with

-C: </path/to/file> for passwords list

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-d: Run a tcp port scan (nmap) on the IP range (-s/-S) before trying to brute force. This will discover whether the target's port is open.

-D: Enable debug mode

-h: Shows a help menu

-k: </path/to/file-or-folder> for key files (for SSH or VNC)

-l: </path/to/file> to store the log file (default is ./crowbar.log)

-m: </path/to/file> for a OpenVPN configuration file

-n: Thread count

-o: </path/to/file> to store the successfully attempt(s) (default is ./crowbar.out)

-p: Port number (if the service is not on the default port)

-q: Enable quiet mode (only show successful logins)

-s: Target IP address/range (in CIDR notation)

-S: </path/to/file> which is stores target IP addresses

-t: Timeout value

-u: Single username

-U: </path/to/file> which stores the username list

-v: Enable verbose mode (shows all the attempts)

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:

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:

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

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

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

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:

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

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

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:

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 certificate file, a single username and a single password with specified port number:

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.

Thanks To

• Bahtiyar Bircan
• Ertuğrul Başaranoğlu
• G0tmi1k

Bookmarks

• Patator - A multi-purpose brute-forcer for protocols that are not supported by Crowbar
• Debian OpenSSL Predictable PRNG - Weak predictable SSH keys for Debian based systems (2011)
• ssh-badkeys - A collection of static private SSH keys