Systems and methods for filtering interprocess communications

1. A computer-implemented method for filtering interprocess communications, at least a portion of the method being performed by a computing device comprising at least one processor, the method comprising:

identifying a service process that provides a service on the computing device;

authenticating the service process by inspecting an assertion file to identify the service provided by the service process;

identifying a request by a client process to use the service provided by the service process;

authenticating the client process;

receiving an interprocess communication from the client process directed toward the service process;

deriving, based on authenticating the client and service processes, a context that identifies an operating environment of the client and service processes;

determining that the interprocess communication is unexpected within the context and is therefore malicious; and

in response to determining that the interprocess communication is malicious, blocking the interprocess communication from being communicated to the service process.

2. The computer-implemented method of claim 1 , wherein receiving the interprocess communication from the client process comprises intercepting the interprocess communication from an interprocess communication service of an operating system executing on the computing device.

3. The computer-implemented method of claim 1 , wherein blocking the interprocess communication from being communicated to the service process comprises preventing the interprocess communication from using an interprocess communication service of an operating system executing on the computing device.

4. The computer-implemented method of claim 1 , wherein authenticating the service process comprises authenticating a digital signature included in the assertion file associated with the service process.

5. The computer-implemented method of claim 1 , wherein:

determining that the interprocess communication is unexpected within the context and is therefore malicious comprises determining that the interprocess communication is not associated with the service provided by the service process.

6. The computer-implemented method of claim 1 , wherein authenticating the client process comprises authenticating a digital signature included in an assertion file associated with the client process.

7. The computer-implemented method of claim 6 , wherein:

authenticating the client process further comprises identifying at least one service used by the client process by inspecting the assertion file; and

determining that the interprocess communication is unexpected within the context and is therefore malicious comprises determining that the interprocess communication is not associated with the service identified by the client process.

8. The computer-implemented method of claim 1 , further comprising authenticating a policy controller that evaluates interprocess communications for maliciousness, wherein determining that the interprocess communication is malicious comprises:

submitting content of the interprocess communication and/or the context of the interprocess communication to the policy controller; and

receiving from the policy controller an indication that the interprocess communication is malicious.

9. The computer-implemented method of claim 1 , wherein:

determining that the interprocess communication is malicious comprises at least one of:

obtaining, by querying a reputation database using information identifying a file associated with the client process, a reputation for the client process; and

obtaining, by querying a reputation database using information identifying a file associated with the service process, a reputation for the service process; and

determining that the interprocess communication is malicious comprises determining that the reputation of the client process and/or the reputation of the service process is negative.

10. A system for filtering interprocess communications, the system comprising:

a service authentication module, stored in memory, that:

identifies a service process that provides a service on a computing device; and

authenticates the service process by inspecting an assertion file to identify the service provided by the service process;

a client authentication module, stored in memory, that:

identifies a request by a client process to use the service provided by the service process; and

authenticates the client process;

a communication module, stored in memory, that receives an interprocess communication from the client process directed toward the service process;

a policy control module, stored in memory, that:

derives, based on authenticating the client and service processes, a context that identifies an operating environment of the client and service processes;

determines that the interprocess communication is unexpected within the context and is therefore malicious; and

in response to determining that the interprocess communication is malicious, blocks the interprocess communication from being communicated to the service process; and

at least one physical processor configured to execute the service authentication module, the client authentication module, the communication module, and the policy control module.

11. The system of claim 10 , wherein the communication module receives the interprocess communication from the client process by intercepting the interprocess communication from an interprocess communication service of an operating system executing on the computing device.

12. The system of claim 10 , wherein the policy control module blocks the interprocess communication from being communicated to the service process by preventing the interprocess communication from using an interprocess communication service of an operating system executing on the computing device.

13. The system of claim 10 , wherein the service authentication module authenticates the service process by:

authenticating a digital signature included in the assertion file associated with the service process.

14. The system of claim 10 , wherein:

the policy control module determines that the interprocess communication is unexpected within the context and is therefore malicious by determining that the interprocess communication is not associated with the service provided by the service process.

15. The system of claim 10 , wherein the client authentication module authenticates the client process by:

authenticating a digital signature included in an assertion file associated with the client process.

16. The system of claim 15 , wherein:

the client authentication module further authenticates the client process by identifying at least one service used by the client process by inspecting the assertion file; and

the policy control module determines that the interprocess communication is unexpected within the context and is therefore malicious by determining that the interprocess communication is not associated with the service identified by the client process.

17. The system of claim 10 , wherein the policy control module:

authenticates a policy controller that evaluates interprocess communications for maliciousness; and

determines that the interprocess communication is malicious by:

submitting the interprocess communication to the policy controller; and

receiving from the policy controller an indication that the interprocess communication is malicious.

18. A non-transitory computer-readable medium comprising one or more computer-readable instructions that, when executed by at least one processor of a computing device, cause the computing device to:

identify a service process that provides a service on the computing device;

authenticate the service process by inspecting an assertion file to identify the service provided by the service process;

identify a request by a client process to use the service provided by the service process;

authenticate the client process;

receive an interprocess communication from the client process directed toward the service process;

derive, based on authenticating the client and service processes, a context that identifies an operating environment of the client and service processes;

determine that the interprocess communication is malicious; and

in response to determining that the interprocess communication is unexpected within the context and is therefore malicious, block the interprocess communication from being communicated to the service process.

19. The non-transitory computer-readable medium of claim 18 , wherein the one or more computer-readable instructions cause the computing device to receive the interprocess communication from the client process by intercepting the interprocess communication from an interprocess communication service of an operating system executing on the computing device.

20. The non-transitory computer-readable medium of claim 18 , wherein the one or more computer-readable instructions cause the computing device to block the interprocess communication from being communicated to the service process by preventing the interprocess communication from using an interprocess communication service of an operating system executing on the computing device.