Many .rar files from unofficial sources are password-protected to bypass automated antivirus scans. Recommended Actions
If you are unsure of the origin, do not extract the contents. SHgurlz.rar
Use a tool like 7-Zip or WinRAR to "Open Archive" rather than "Extract" to view the list of files inside without running them. SHgurlz.rar
Be wary of .exe , .bat , or .vbs files hidden inside the archive, especially if the expected content was images or data files. Need to open, create, or convert a RAR file? - WinZip SHgurlz.rar