add realm handling to psexec

oops, forgot to create the realm when applicable

modules/exploits/windows/smb/psexec.rb

@@ -123,6 +123,13 @@ class Metasploit3 < Msf::Exploit::Remote
           username: datastore['SMBUser'].downcase
       }
 
+      if datastore['SMBDomain'] and datastore['SMBDomain'] != 'WORKGROUP'
+        credential_data.merge!({
+          realm_key: Metasploit::Credential::Realm::Key::ACTIVE_DIRECTORY_DOMAIN,
+          realm_value: datastore['SMBDomain']
+         })
+      end
+
       if datastore['SMBPass'] =~ /[0-9a-fA-F]{32}:[0-9a-fA-F]{32}/
         credential_data.merge!({:private_type => :ntlm_hash})
       else