Application layer bot attacks don’t get as much attention as DDoS bot attacks because the latter are generally much larger and broader in scope, but application layer attacks can steal information through data mining and account hijacking. Read more about these types of bot attacks here:
http://www.darkreading.com/attacks-breaches/the-bot-threat-for-the-rest-of-us-application-layer-attacks-/a/d-id/1319510