Search Evasion Techniques
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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 to …
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, and …