Files with cryptic names like krisva3.rar are frequently identified as RedLine Stealer or similar Trojans that aim to steal browser passwords, cookies, and crypto wallets.

If the archive contains a file named "prepare" (like prepare.bat or setup.exe ), it is often designed to disable Windows Defender or create an exclusion folder so the actual virus can run without being detected.

If you still have the file, upload it to VirusTotal to see if multiple antivirus engines flag it as malicious.

If you have already executed any file from that archive, run a full system scan using a reputable tool like Malwarebytes or the built-in Windows Security to check for infections.