Add a basic check

Author: wchen-r7

modules/exploits/windows/local/ntapphelpcachecontrol.rb

@@ -121,6 +121,14 @@ def upload_exploit
     )
   end
 
+  def check
+    if sysinfo['OS'] =~ /Windows 8/
+      return Exploit::CheckCode::Appears
+    end
+
+    Exploit::CheckCode::Safe
+  end
+
   def exploit
     print_status("Uploading the payload DLL")
     upload_payload