The use of mobile phones has increased in our lives because they offer nearly the same functionality as a personal computer. Besides, the number of applications available for Android-based mobile devices has also experienced a importat grow. Google offers to programmers the opportunity to upload and sell applications in the Android Market, but malware writers upload their malicious code there. In light of this background, we present here Malicious Android applications Detection through String analysis (MADS), a new method that extracts the contained strings from the Android applications to build machine-learning classifiers and detect malware.