ClamAV

ClamAV is an open source antivirus for Windows, Linux and macOS. With it, you can scan the entire computer for malware and malicious files. In its macOS version, there are several ways to install it: through Homebrew, or through the official macOS package.

The program has no interface, and its execution is done through Terminal. On Linux, it is possible to enable real-time protection, but on macOS you can only use it to scan for malware on an ad hoc basis. To update the virus database, use the freshclam command. To scan the entire device, use the clamscan command.

ClamAV was created as an antivirus aimed at scanning email and web browsers for malicious content. However, its antivirus and database update core now allows for the scanning of all types of system elements that may be affected by malware.

Its simplicity and advanced antivirus engine allows it to scan for malware quickly and without consuming too many resources. It is capable of detecting millions of viruses, worms, Trojans and other malware, such as those that exploit Office macros. It can also extract files for scanning, including .zip, .rar, .img, .iso, etc. So, if you are looking for a lightweight antivirus for macOS, you can download ClamAV.