Google has a hugely privileged view of the Internet and it uses that position to collect data and intelligence on malicious Web site behavior and malware trends. In a new report based on four years worth of data on site and malware activity, the company found that attackers are now deploying highly specialized evasion and obfuscation techniques that play off what researchers and users do and then adjust and adapt. Social engineering malware the kind that uses various tricks to goad users into visiting a site or downloading a file make up barely two percent of all malware observed by Google.
Source: https://threatpost.com/google-most-vulnerabilities-only-exploited-short-time-081811/75558/