The OWASP Mobile Security Testing Guide (MSTG) is the ultimate guide for mobile app security testing and reverse engineering. The MSTG is a comprehensive manual for testing the security of mobile apps. It describes technical processes for verifying the controls listed in the OWASP Mobile Application Verification Standard (MASVS). The MSTG provides a baseline set of test cases for black-box and white-box security tests, ensuring completeness and consistency of the tests.