Advanced Protection users are already well-protected from phishing. As a result, we’ve seen that attackers target these users through other means, such as leading them to download malware. In August 2019, Chrome began warning Advanced Protection users when a downloaded file may be malicious.
Now, in addition to this warning, Chrome is giving Advanced Protection users the ability to send risky files to be scanned by Google Safe Browsing’s full suite of malware detection technology before opening the file. We expect these cloud-hosted scans to significantly improve our ability to detect when these files are malicious.
When a user downloads a file, Safe Browsing will perform a quick check using metadata, such as hashes of the file, to evaluate whether it appears potentially suspicious. For any downloads that Safe Browsing deems risky, but not clearly unsafe, the user will be presented with a warning and the ability to send the file to be scanned. If the user chooses to send the file, Chrome will upload it to Google Safe Browsing, which will scan it using its static and dynamic analysis techniques in real time. After a short wait, if Safe Browsing determines the file is unsafe, Chrome will warn the user. As always, users can bypass the warning and open the file without scanning, if they are confident the file is safe. Safe Browsing deletes uploaded files a short time after scanning.
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