Development of UBoatRAT At the time of this writing, we have identified fourteen samples of UBoatRAT and one downloader associated with the attacks. Most of UBoatRAT samples retrieve C2 address from GitHub as described above. Only one sample released in May connected to public blog service in Hong Kong and compromised legitimate web server in Japan as C2. The sample uses regular HTTP protocol for communication. The account for the blog, 'elsa_kr' has existed since April 2016 and has no meaningful contents at this moment