Lisa is investigating a network breach and discovered a program that was able to execute code within the address space of another process by using a target process to load a specific library. What type of attack is this?

The answer is "DLL injection"

Explanation:

DLL injection is being used to manage running system output. There are  Many injections, which is done to perform reverse strategies.

It is the term, that indicates this key technique to call a harmful DLL file to just be run as part of the aim operation.

This method is frequently used by internal programmers to manipulate the actions of another system in a way, it can't be planned or expected by their creators.