Analysis of commands of Telnet logs illegally connected to IoT devices

Mirai is an active malware that targets and poses constant threats to IoT devices. IoT malware penetrates IoT devices illegally, makes them download other malware such as bots, and infects them. Therefore, to improve the security of IoT devices, it is important to analyze the behaviors of IoT malware and take countermeasures. In this study, to analyze the behaviors of IoT malware after entering IoT devices and propose new security functions for operating systems to prevent activities such as IoT malware infection, we analyze Telnet logs collected by a honeypot of IoT devices. Thereafter, we report the analysis results regarding IoT malware input commands. The results show that many commands related to shell execution, file download, changing file permissions, and file transfer, are often executed by IoT malware.