There is a specific Rar ransomware variant that encrypts your system's files and appends a .Rar extension to them. Safe Handling Procedures
If you open the archive to view its contents, look for hidden extensions like .exe , .scr , or .bat disguised as documents.
Upload the file to VirusTotal to check it against multiple antivirus engines .
Is WinRAR safe? Everything you need to know - ExpressVPN
While the RAR format itself is a legitimate compression tool, attackers often use it to conceal malicious scripts or executables. A file titled "ACCOUNTS" is a typical social engineering tactic used to bait users into opening it, thinking it contains sensitive login info.
If you have already downloaded this file, any files within it.
Ensure you are using the latest version of WinRAR (6.23 or higher) to avoid known vulnerabilities that allow automatic code execution.