Themida is an advanced Windows software protection system. When an application is being created, the compiler will compile the application source code into several object files made of machine language code. Then the object files are linked together to create the final executable. In the same manner that the source code of an application is converted into machine code at compilation time, there are tools that can convert a compiled application into assembly language or a higher programming language. These tools are known as dissemblers and de-compilers.
Software protectors were created to keep an attacker from directly inspecting or modifying a compiled application. A software protector is like a shield that keeps an application encrypted and protected against possible attacks. When a protected application is going to be run by the operating system, the software protector will first take control of the CPU and check for possible cracking tools (dissemblers or de-compilers) that may be running on the system. If everything is safe the software protector will proceed to decrypting the protected application and giving it the control of the CPU to be executed as normal. It advantages protecting an application against piracy, prevent attackers from studying how an application is implemented, and will not allow attackers to modify an application to change its behavior.
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