Abstract: Systems and methods for detecting abnormal user activity comprising: tracking, by the server, during a first time period, user activity associated with an application service, determining, by the server, that the user activity associated with the application service exceeds a respective first predetermined threshold of user activity during the first time period, in response to determining that the user activity exceeds the first predetermined threshold, activating a second predetermined threshold, thereby triggering the system to track, during a second time period user activity associated with the application service, the tracking comprising tracking a content of the user interactions with the application service, determining that the user activity exceeds the second predetermined threshold of user activity during the second time period and in response to determining that the user activity exceeds the second predetermined threshold, triggering a user challenge procedure on a client device.

Abstract: A computer implemented method for detecting an preventing spam account generation is disclosed. The method comprises receiving, by the email server, a request from the browser application to create an email account for at least one of sending and receiving an electronic message over the communication network, the request comprising at least the unique browser ID, acquiring, a browsing history data associated with the unique browser ID, the browsing history data being indicative of the browser application's browsing history with the at least one web resource; analyzing the browsing history data to determine a user score of the request, the user score being indicative of a likelihood that the user is one of a human or a bot executed by a computer application; and upon determining that the user score is indicative of a higher likelihood that the user is the bot, performing a restrictive action to the request.

Abstract: Systems and methods for detecting abnormal user activity comprising: tracking, by the server, during a first time period, user activity associated with an application service, determining, by the server, that the user activity associated with the application service exceeds a respective first predetermined threshold of user activity during the first time period, in response to determining that the user activity exceeds the first predetermined threshold, activating a second predetermined threshold, thereby triggering the system to track, during a second time period user activity associated with the application service, the tracking comprising tracking a content of the user interactions with the application service, determining that the user activity exceeds the second predetermined threshold of user activity during the second time period and in response to determining that the user activity exceeds the second predetermined threshold, triggering a user challenge procedure on a client device.

Abstract: Systems and methods for detecting abnormal user activity comprising: tracking, by the server, during a first time period, user activity associated with an application service, determining, by the server, that the user activity associated with the application service exceeds a respective first predetermined threshold of user activity during the first time period, in response to determining that the user activity exceeds the first predetermined threshold, tracking, during a second time period user activity associated with the application service, the tracking comprising tracking a content of the user interactions with the application service, determining that the user activity exceeds a second predetermined threshold of user activity during the second time period and in response to determining that the user activity exceeds the second predetermined threshold, triggering a user challenge procedure on a client device.

Abstract: A method of and a system for user authentication in an electronic service for transmitting digital objects, the electronic service accessible by a client device via a client application, the client application associated with at least one native network protocol. The method includes receiving a request for access to a user profile in the electronic service, including user account data and at least one user behavior parameter; responsive to at least one user behavior parameter being different from the user behavior parameters stored in the user profile, creating a digital object with an indication of a verification routine; transmitting the digital object via the native network protocol to the client application, the digital object configured to cause the client device to perform the verification routine via at least one non-native network protocol; responsive to the verification routine rendering a positive outcome, granting access to the user profile.

Abstract: A computer implemented method for detecting an preventing spam account generation is disclosed. The method comprises receiving, by the email server, a request from the browser application to create an email account for at least one of sending and receiving an electronic message over the communication network, the request comprising at least the unique browser ID, acquiring, a browsing history data associated with the unique browser ID, the browsing history data being indicative of the browser application's browsing history with the at least one web resource; analyzing the browsing history data to determine a user score of the request, the user score being indicative of a likelihood that the user is one of a human or a bot executed by a computer application; and upon determining that the user score is indicative of a higher likelihood that the user is the bot, performing a restrictive action to the request.

Abstract: Systems and methods for detecting abnormal user activity comprising: tracking, by the server, during a first time period, user activity associated with an application service, determining, by the server, that the user activity associated with the application service exceeds a respective first predetermined threshold of user activity during the first time period, in response to determining that the user activity exceeds the first predetermined threshold, tracking, during a second time period user activity associated with the application service, the tracking comprising tracking a content of the user interactions with the application service, determining that the user activity exceeds a second predetermined threshold of user activity during the second time period and in response to determining that the user activity exceeds the second predetermined threshold, triggering a user challenge procedure on a client device.

Abstract: A method of and a system for user authentication in an electronic service for transmitting digital objects, the electronic service accessible by a client device via a client application, the client application associated with at least one native network protocol. The method includes receiving a request for access to a user profile in the electronic service, including user account data and at least one user behavior parameter; responsive to at least one user behavior parameter being different from the user behavior parameters stored in the user profile, creating a digital object with an indication of a verification routine; transmitting the digital object via the native network protocol to the client application, the digital object configured to cause the client device to perform the verification routine via at least one non-native network protocol; responsive to the verification routine rendering a positive outcome, granting access to the user profile.