Search Evasion Techniques
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TLS Callback Anti-Debugging
TLS (Thread Local Storage) callbacks are a mechanism in Windows that allows a program to define a function that will be called when a thread is created. These callbacks can be used to perform various tasks, such as initializing thread-specific data or modifying the behavior of the thread.
As an anti-debugging technique, a program can use a TLS callback …
Interrupts Anti-Debugging
Adversaries may use exception-based anti-debugging techniques to detect whether their code is being executed in a debugger. These techniques rely on the fact that most debuggers will trap exceptions and not immediately pass them to the process being debugged for handling.
By triggering an exception and checking whether it is handled properly, the adversary's code can determine whether it …
Call to Interrupt Procedure Anti-Debugging
This anti-debugging technique involves using the INT n instruction to generate a call to the interrupt or exception handler specified with the destination operand.
To implement this technique, the int 0x03 instruction is executed, followed by a ret (0xCD03, 0xC3) nested in a __try, __except block. If a debugger is present, the except block will not be executed, …