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Recently, the number of Malware incidents has been rapidly increasing but we are too short of experts to handle the situation. Fortunately, most Malware instances are a mutation of an existing one, so it might be effective to use an auto-analysis system to observe a specific Malware. The auto-analysis system for Malware uses both the dynamic and static methods, but the latter still has some limitations and accordingly requires further research.However, this study uses the static method, which calculates the similarity between two files to be executed through by comparing character strings to identify and classify Malware. This method, whose performance depends on the number and type of character strings to be compared, requires a process to refine the character strings. In addition, it provides an advanced comparison mechanism that reflects the characteristics of the character strings held by a specific Malware, in the calculation of similarity.

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