Originally published at: http://www.howtogeek.com/174846/latest-chrome-canary-channel-build-adds-automatic-malware-download-blocking-feature/
As Chrome’s popularity continues to grow, malware authors are looking for new ways to target and trick users of Google’s browser into downloading malicious software to their computers. With this problem in mind, Google has introduced a new feature into the Canary Channel to automatically detect and block malware downloads whenever possible in order to help keep your system intact and safe.
How does it decied if something is malware.
I believe it is tied in with Google's purchase/acquisition of VirusTotal earlier this year...