A 35-year-old Ukrainian man has been arrested for running a large-scale cryptojacking operation that allegedly compromised over 5,000 hosting servers and resulted in losses exceeding $4.5 million. Europol has called for enhanced security measures in response to this incident, highlighting the vulnerability of digital infrastructure to such attacks. The suspect exploited vulnerable server accounts to install unauthorized mining software focused on Bitcoin and Ethereum, a tactic that significantly impacted both the cryptocurrency and cloud computing sectors. The Ukrainian Cyberpolice led the operation with support from Europol and an unnamed cloud service provider. This arrest underscores the urgent need for robust cybersecurity practices across all industries.