Mobile banking applications have become a critical part of the modern banking ecosystem. Their handling of highly sensitive data and their ability to perform financial operations, coupled with their widespread adoption, make them very attractive targets for attackers. This thesis presents the design and development processes of Code Guardian, a static analysis tool aimed at supporting the vulnerability assessment of mobile banking applications distributed as APK(Android) and IPA(iOS) packages, focusing particularly on the evaluation of the obfuscation level. Code Guardian's analysis encompasses the inspection of the application's metadata, file system, embedded resources and binary executables and follows the guidelines of the OWASP Mobile Application Security(MAS) project.