BASANAI is a newly identified MedusaLocker-family ransomware variant targeting Windows systems, employing double extortion via file encryption and claimed pre-encryption data exfiltration. No CVE identifier exists and BASANAI-specific IOCs are not yet available from primary sources; detections should rely on MedusaLocker family behavioral baselines including mass file extension changes, README.txt ransom note creation, shadow copy deletion, and anomalous RDP authentication events. Priority hardening actions include isolating internet-exposed RDP, enforcing MFA on all remote access, and validating offline backup integrity.