gaurd against arch mismatch

this will not work from an x86 proc
on an x64 machine, so guard against that.

MSP-12358

Author: David Maloney

modules/post/windows/gather/credentials/domain_hashdump.rb

@@ -97,6 +97,9 @@ def preconditions_met?
       print_error "This module requires UAC to be bypassed first"
       status = false
     end
+    unless session_compat?
+      status = false
+    end
     return status
   end
 
@@ -105,6 +108,16 @@ def repair_ntds(path='')
     cmd_exec("esentutl", arguments)
   end
 
+  def session_compat?
+    if sysinfo['Architecture'] =~ /x64/ && session.platform =~ /x86/
+      print_error "You are running 32-bit Meterpreter on a 64 bit system"
+      print_error "Try migrating to a 64-bit process and try again"
+      false
+    else
+      true
+    end
+  end
+
   def vss_method
     id = create_shadowcopy("#{expand_path("%SystemDrive%")}\\")
     sc_details = get_sc_details(id)