Developing an application that can steal user data is a serious violation of laws and ethics. Even if you claim that it is only used for ethical hacking tests, you still have the responsibility to ensure that it is not used maliciously and may face serious legal consequences. Stealing user data without authorization violates the user's right to privacy and is an illegal act. Ethical hacking tests should be conducted in a legal, compliant, and clearly authorized manner. Under no circumstances should such potentially harmful applications be developed, but related work should be carried out through legal means and formally authorized security testing methods to protect data security and legitimate rights and interests. Once such an application is developed and disseminated, you may be held accountable for legal responsibilities, including civil compensation and criminal penalties.