Some basic email scanners are more efficient at "peeking" inside .zip files than .rar archives.
While .zip is the most common compression format, attackers often use .rar or .7z because: JuHlandDMgglssga01 rar
Attackers often password-protect these archives (providing the password in the email body) to prevent automated antivirus tools from scanning the contents. 3. Potential Contents and Payloads Some basic email scanners are more efficient at