Use a reputable antivirus (like Microsoft Defender, Malwarebytes, or Bitdefender) to scan your entire system.
If you encounter this file online, note the following red flags: Download Suspect Sant42WERFGTYT rar
If you are curious, you can upload the file to VirusTotal.com (without opening it) to see how many security engines flag it as malicious. Download Suspect Sant42WERFGTYT rar