The extension .rar indicates a compressed archive file. Such files are often used by threat actors to bypass email scanners. Inside, it likely contains a malicious executable ( .exe , .scr ) or a document with malicious macros (e.g., .docm ).
This is almost certainly malware , potentially a trojan or ransomware , designed to steal credentials or encrypt files, leveraging nostalgia or curiosity regarding the historic "Melissa" virus. M3liss@.rar
did you find this file (email, file-sharing site, etc.)? Have you already executed or extracted the file? This will help me suggest the best security steps. The extension
Delete the file and empty your recycle bin immediately. potentially a trojan or ransomware