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Advanced Persistent Threat (APT) is one of the most serious types of cyber attacks, which is a new and more complex version of multi-step attack. Within the APT life cycle, the most common technique used to get the point of entry is spear-phishing emails which may contain disguised executable files. This paper presents the disguised executable file detection (DeFD) module, which aims at detecting disguised exe files transferred over the connections. The detection is based on a comparisondoi:10.7287/peerj.preprints.2998 fatcat:uhmtc4o6wrhfbdcsxzwujtdeu4