System for cross-host, multi-thread session alignment

A system for detecting aberrant behavior in a software application, the system comprising at least one processor;

• and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the system to:
• instantiate a plurality of replicated applications on at least one computing device using identical initial setting, wherein each replicated application in the plurality of replicated applications is a replicated instance of the software application, and the plurality of replicated applications includes a first replicated application and a second replicated application;
• enforce deterministic behavior, so that each replicated application thread executes application program interface (API) calls in the same sequence and generating call identifiers which are unique for the duration of the replicated application and identical across the plurality of replicated applications;
• receive first information associated with a first API call from the first replicated application, the first information including a first call identifier of the first API call and a first digest;
• receive second information associated with a second API call from the second replicated application, the second information including a second call identifier of the second API call and a second digest;
• in response to determining the first call identifier and the second call identifier are identical, determine whether the first digest matches the second digest;
• and
• in response to the first digest not matching the second digest, signal that aberrant behavior has occurred.