The U.S. Coast Guard has issued a warning after its monitoring system was compromised by a “Ryuk” ransomware that left the system stunned for 30 hours. It is yet to be ascertained whether the attackers made a demand for any ransom; usually, Ryuk ransomware is followed by a demand for a ransom in crypto. The warning was issued on the marine safety bulletin platform after the attackers had targeted an unnamed facility. An initial investigation report suggested that a sophisticated phishing attack had facilitated the spread of a ransomware program…