![]() ![]() Typically, a JMP or CALL is inserted to transfer execution to new code that will perform the new functionality and, depending on the intended behavior, may return to the original function to complete its execution. In both ‘good’ and ‘bad’ uses, hooks are inserted by overwriting the first few bytes of a target function to hijack execution flow. Bad actors have also determined how to monetize the technique by hooking browsers to invisibly modify online banking sites to steal credentials or initiate fraudulent transfers. The technique can also be used by the bad actors, for instance to implement a rootkit to hide processes and network connections from the end-user and security software. The antivirus (AV) industry uses code hooking to monitor processes for potentially malicious behavior, protect applications by injecting anti-exploitation checks, and isolate processes by sandboxing or virtualization. Disabling digital rights management systems.Code hooks can perform a wide variety of functionality both innocent and nefarious, including: Essentially, a ‘hook’ is something that will allow the developer to see, view, and interact with something that is already going on in the system. Code hooking is a technique used for redirecting a computer's execution flow to modify software.
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