Security threats on modern smartphones are increased rapidly with the excessive numbers of the users. According to the reports, it is exposed that most security issues are introduced from usage of malicious applications. Operating systems with the permission model, such as Android, accept us to install third-party applications. This leads attackers enable to inject exploits into a clean ... [Show full abstract] application, sothat an application apparently works as normal but executes malicious functions inthe background. Therefore, we introduce with analysis of the method to prevent an installation of malicious applications using permissions using Maximum Severity Rating (MSR) classification. Then, the method to enhance an ability to perceive warning signs in the procedure of an application installation and comparison of its effectiveness with existing method is introduced. Overall, the processes assist the users to make a better decision with detailed information.