Detection of replacement/copy-paste attacks through monitoring and classifying api function invocations

Abstract

A system processes an API specification provided by a vendor to determine and classify the functions defined therein by CRUD operation type based on analysis of the function names. Classification of the function includes associating a bitmask corresponding to the class with the function name. The system then subscribes to an event stream including logged API function call events during a time window overlapping with a 'blind spot' period of attack detection. The system analyzes incoming events to identify an associated resource and an API function call. The system classifies the function based on the determined function classes and performs a bitwise operation between bit values maintained for the identified resource that are indicative of resource state and the bitmask of the function class. If the resulting bit values indicate that the resource was both created and deleted during the time window, the system flags the resource as potentially involved in an attack.