Mamona is a newly identified strain of commodity ransomware that operates entirely offline, setting itself apart from conventional ransomware-as-a-service models that require network-based command-and-control infrastructure. This ransomware employs custom-built cryptographic routines and allows any threat actor to deploy it independently through builder kits, following its public exposure on the clearnet. It targets Windows systems by encrypting user-accessible files, renaming them with a .HAes extension, and deploying ransom notes throughout directories, all without exfiltrating data or using external libraries. The ransomware also uses techniques like obfuscated delays and self-deletion to evade detection and complicate forensic analysis. While a decryptor tool has been confirmed to restore encrypted files, Mamona's execution disrupts business continuity by causing data loss and workflow interruptions. Enhanced detection and protection measures are recommended, including regular offline backups, endpoint monitoring, user education, and network segmentation to mitigate its impact.