Eul-Geol Im

Summary The number of ransomware variants has increased rapidly every year, and ransomware needs to be distinguished from the other types of malware to protect users' machines from ransomware‐based attacks. Ransomware is similar to other types of malware in some aspects, but other characteristics are clearly different. For example, ransomware generally conducts a large number of file‐related operations in a short period of time to lock or to encrypt files of a victim's machine. The signature‐bas

This paper proposes a novel malware visual analysis method that contains not only a visualization method to convert binary files into images, but also a similarity calculation method between these images. The proposed method generates RGB-colored pixels on image matrices using the opcode sequences extracted from malware samples and calculates the similarities for the image matrices. Particularly, our proposed methods are available for packed malware samples by applying them to the execution trac

Summary With the growing number of malware, malware analysis technologies need to be advanced continuously. Malware authors use various packing techniques to hide their code from malware detection tools and techniques. The packing techniques are generally used to compress and encrypt executable code in executable files, and the unpacking code is usually embedded in the executable files. Therefore, packed executable files can be executed by itself, and the information associated with packing can

As the number of Android malware has been increased rapidly over the years, various malware detection methods have been proposed so far. Existing methods can be classified into two categories: static analysis-based methods and dynamic analysis-based methods. Both approaches have some limitations: static analysis-based methods are relatively easy to be avoided through transformation techniques such as junk instruction insertions, code reordering, and so on. However, dynamic analysis-based methods

This paper proposes an advanced countermeasure against distributed web-crawlers. We investigated other methods for crawler detection and analyzed how distributed crawlers can bypass these methods. Our method can detect distributed crawlers by focusing on the property that web traffic follows the power distribution. When we sort web pages by the number of requests, most of requests are concentrated on the most frequently requested web pages. In addition, there will be some web pages that normal u

With the advancement of network communication technology and Internet of Everything (IoE) technology, which connects all edge devices to the internet, the network traffic generated in various platform environments is rapidly increasing. The increase in network traffic makes it more difficult for the detection system to analyze and detect malicious network traffic generated by malware or intruders. Additionally, processing high-dimensional network traffic data requires substantial computational r