Navegando por Autor "MOREIRA, Caio Carvalho"

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Acesso aberto (Open Access)
Abordagem Inteligente com Combinação de Características Estruturais para Detecção de Novas Famílias de Ransomware
(Universidade Federal do Pará, 2024-03-22) MOREIRA, Caio Carvalho; SALES JUNIOR, Claudomiro de Souza de; País de Nacionalidade Brasi
Ransomware is a malicious software that aims to encrypt user files and demand a ransom to unlock them. It is a cyber threat that can cause significant financial damage, as well as compromise privacy and data integrity. Although signature-based detection scanners commonly combat this threat, they fail to identify unknown ransomware families (variants). One method to detect new threats without the need to execute them is static analysis, which inspects the code and structure of the software, along with classification through intelligent approaches. The Detection of New Ransomware Families (DNFR) can be evaluated in a realistic and challenging scenario by categorizing and isolating families for training and testing. Hence, this thesis aims to develop an effective static analysis model for DNFR, which can be applied in Windows systems as an additional security layer to check executable files upon receipt or before execution. Early ransomware detection is essential to reduce the likelihood of a successful attack. The proposed approach comprehensively analyzes executable binaries, extracting and combining various structural features, and distinguishes them between ransomware or benign software employing a soft voting model comprising three machine learning techniques: Logistic Regression (LR), Random Forest (RF), and eXtreme Gradient Boosting (XGB). Results for DNFR demonstrated an average accuracy of 97.53%, precision of 96.36%, recall of 97.52%, and F-measure of 96.41%. Additionally, scanning and predicting individual samples took an average of 0.37 seconds. This performance indicates success in quickly identifying unknown ransomware variants and adapting the model to the constantly evolving landscape, suggesting its applicability in antivirus protection systems, even on resource-limited devices. Therefore, the method offers significant advantages and can assist developers of ransomware detection systems in creating more resilient, reliable, and fast-response solutions.
Acesso aberto (Open Access)
Navegação, reconhecimento de gestos e controle de interface no sistema ITV utilizando o dispositivo kinect
(Universidade Federal do Pará, 2013-05-10) MOREIRA, Caio Carvalho; RIBEIRO FILHO, Manoel; http://lattes.cnpq.br/9329438229733907
This work presents the implementation of navigation in the virtual environment, gesture recognition and interface control, able through the Kinect device, in the ITV System: a system for training operators and maintainers of hydroelectrics and electrical substations. In addition, it shows some recent improvements, such as conversion of a ITV on a video file, audio and visual alarms, ambience sound in three dimensions and narration of the process. Besides presenting the ITV System, are exposed to the Kinect device and the algorithm used to compare patterns of movement, the DTW. Then, this work explains in detail the design and the implementation of the navigation, the interface control and the gesture recognition. As a case study, it displays a Virtual Technical Instruction (ITV), designed especially to test and evaluate the new proposed interface. Subsequently, this work presents satisfactory results, obtained through the analysis of qualitative questionnaires applied to the students of the Federal University of Pará. Finally, considerations for this study and ideas for future work are made.