Downloading files from suspicious emails or websites is not advisable. Corporate emails containing attachments should always prompt the recipient to be cautious, especially if the extension is unknown or is often linked with malware. Some malicious files come in file formats such as .zip, .exe and .scr.
Web browsers include settings to restrict access to dangerous websites, and when one attempts to access a bad site, an alert message appears. Ignore such warnings and refrain from visiting that website or accessing that file. Be wary of harmful files; a phishing attempt may arrive as an attached file. Check if these files are expected or if the source is trustworthy. Security experts recommend never opening an attachment unless certain that the communication is from a genuine source. Even still, keep an eye out for anything odd in the attachment.
Tips: Run a virus or malware scanner on files before downloading attachments.