(To be fair, it stopped between 99.1 and 99.9 percent of widespread malware in all three instances.) In earlier tests conducted on Windows 10 by AV-TEST, Windows Defender stopped 80.5 of zero-day malware in September 2015, and 95 percent the following month.
In December 2015, its Windows 8.1 zero-day-detection rate slipped to 90 percent. In evaluations conducted on Windows 8.1 in November 2015 by German independent lab AV-TEST, Windows Defender detected 97.5 percent of zero-day malware, and 99.6 percent of widespread malware.īut Windows Defender's detection rates are consistently inconsistent. That doesn't mean Windows Defender isn't getting better than it once was. Our best-reviewed products, Avira Free Antivirus and Bitdefender Antivirus Plus, have detection engines that consistently stop between 99 and 100 percent of both categories of malware. Most other products we review, free or paid, stop better than 95 percent of zero-day malware, and 98 or 99 percent of widespread malware.
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