The company is targeting malware and malicious extensions that modify search results to redirect users to unintended pages, inject ads, and lock users on ad-filled sites.
The new security features for Chrome on Windows are an addition to existing defenses, such as Safe Browsing warnings for pages known to deliver malware.
Google is now clamping down on Chrome extensions that change user settings, such as the default search engine. The browser will automatically detect when an unauthorized change is made and offers to restore the original settings.
It has also redesigned Chrome's Cleanup feature which offers a shortcut to restoring the browser's default settings after an infection. It shows an alert when the browser detects unwanted software and offers a way to remove it. Chrome users have previously been able to use the standalone Chrome Cleanup Tool to remove harmful software. Google says it redesigned the alerts to make it easier to see what software will be removed.
Chrome Cleanup has also gained a malware detection engine from antivirus firm ESET, which works in tandem with Chrome's sandbox technology.
This integration of the new "sandboxed engine" doesn't replace antivirus on Windows as it only targets and removes software that violates Google's unwanted software policy. However the policy covers a variety of bad behaviors, from deceptive installs to spyware. It also mean that Chrome can detect and remove more unwanted software than previously.
Google estimates the new security features will help "tens of millions" of Chrome users clear up security problems in the next few days.