User input is collected that is received by a client device, where the client device provides access to a remotely hosted application. The client device analyzes the collected user input received by the client device in order to detect collected user input indicative of machine behavior that simulates inputs provided by a user. The client device prevents subsequent access to the hosted application through the client device in response to detection of collected user input received by the client device indicative of machine behavior that simulates inputs provided by a user, in order to protect the remotely hosted application from malicious attacks.