Cloud services discovery and monitoring

1. A computer system for shadow IT discovery comprising:

one or more computer processors controlling operation of a message monitor, a message analyzer and a reporter;

a message monitor under control of said one or more computer processors, using application programming interface (API) calls to remotely monitor content of messages within an enterprise messaging service that provides communication between users belonging to the enterprise and cloud services, to discover a message welcoming a new registrant to a specific cloud service, or a message notifying a user of the specific cloud service that an event relating to the service has occurred, wherein the message monitor does not intermediate messages between the enterprise messaging service and the users;

a message analyzer under control of said one or more computer processors, analyzing the message discovered by said message monitor to determine (i) the nature of the specific cloud service, (ii) one or more enterprise users who use the specific cloud service without having obtained approval from the enterprise, (iii) external users not belonging to the enterprise who are collaborating with users belonging to the enterprise via the specific cloud service, and (iv) whether an enterprise user has administrator privilege for the specific cloud service, based on the presence of patterns indicating subscription to and usage of the specific cloud service, and links and attachments of the message; and

a reporter under control of said one or more computer processors, results of said message analyzer to an administrator of the enterprise.

2. A method for shadow IT discovery controlled by one or more computer processers, comprising:

using application programming interface (API) calls to remotely monitor content of messages within an enterprise messaging service that provides communication between users belonging to the enterprise and cloud services, without intermediating messages between the enterprise messaging service and the users;

discovering a message welcoming a new registrant to a specific cloud service, or a message notifying a user of the specific cloud service that an event relating to the service has occurred;

analyzing the discovered message to determine (i) the nature of the specific cloud service, (ii) one or more enterprise users who use the specific cloud service without having obtained approval from the enterprise, (iii) external users not belonging to the enterprise who are collaborating with users belonging to the enterprise via the specific cloud service, and (iv) whether an enterprise user has administrator privilege for the specific cloud service, based on the presence of patterns indicating subscription to and usage of the specific cloud service, and links and attachments of the message;

reporting the results of said analyzing to an administrator of the enterprise.

3. The method of claim 2 comprising further analyzing the discovered message to determine (iii) the first enterprise user to sign up to the specific cloud service, and (iv) a sign-up date when the first enterprise user signed up to the specific cloud service.

4. The computer system of claim 1 wherein said message analyzer analyzes meta-data of the message to determine a sign-up date, a first user, and recent usage of the specific cloud service.

5. The computer system of claim 1 wherein said message analyzer determines whether an enterprise user has a paid subscription or a trial subscription to the specific cloud service.

6. The method of claim 2 wherein said analyzing determines whether an enterprise user has a paid subscription or a trial subscription to the specific cloud service.