Google started to show warnings for search results that install malicious software. The same warnings can be seen in image search (one example is an "innocent" query like site:crackserver.com, that shows all the images indexed from crackserver.com). If you click on a thumbnail from the search results, you'll be sent to an interstitial that recommends to try another search result.
In the new interface of image search, the domain name is less visible, as you have to hover over the thumbnail to see it. So these malware warnings could help you avoid sites that might damage you computer.
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