If this was received via email, report it to your IT department or as phishing to your email provider. To give you more specific advice, could you tell me:

Scan the file with reputable, updated antivirus software (e.g., Windows Defender, Malwarebytes).

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 ).

If you have downloaded this file, do not extract or run it .

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.