If you are a developer or security researcher wanting to "develop a piece" (such as a report or a removal tool) for this:
: Check the file's hash (MD5/SHA256) against databases like Any.Run or Joe Sandbox . 21453.rar
: You can upload the file to VirusTotal without opening it. This service will run the file against over 70 different antivirus engines to see if it has been flagged before. If you are a developer or security researcher
Are you trying to recover from an infection caused by this file, or 21453.rar