Google Analytics Spam on Mobile - App Not Released

Question

Across multiple Google Analytics accounts there seems to be an outbreak of spam. Lots of events posted similar to the one below:

EVENT CATEGORY: to u

Answer 1

I found some info,it may be useful.

http://blog.analytics-toolkit.com/2015/guide-referrer-spam-google-analytics/

https://productforums.google.com/forum/#!topic/analytics/7qJIbsK-svA