A joint cybersecurity advisory has been issued by multiple agencies to warn companies about the Medusa ransomware.Medusa is a ransomware-as-a-service (RaaS) variant that has impacted over 300 victims across various critical infrastructure sectors.The ransomware gains access through phishing campaigns and exploits unpatched software vulnerabilities.The threat actors encrypt files with the .medusa extension and communicate with victims through a .onion data leak site.