I-Filter: Identical Structured Control Flow String filter for accelerated malware variant classification

As the number of malware variants has grown rapidly, classification speed has become crucial in security issues. While several techniques for malware variant classification have been proposed, they involve a speed-accuracy trade-off. In an attempt to achieve a speedy and accurate malware variant classification, we thoroughly analyze previously proposed methods and identify a critical performance bottleneck in string-to-string matching. This paper presents and evaluates a technique called I-Filter that enhances the performance of the previous approach, approximate matching. I-Filter has the following novel mechanism, the hash-based equivalent procedure matching technique. Our performance evaluation confirms that a performance improvement of on average 1,043 times through I-Filtering.