AV-TEST Product Review and Certification Report – Sep-Oct/2017

During September and October 2017 we continuously evaluated 21 home user security products using their default settings. We always used the most current publicly-available version of all products for the testing. They were allowed to update themselves at any time and query their in-the-cloud services. We focused on realistic test scenarios and challenged the products against real-world threats. Products had to demonstrate their capabilities using all components and protection layers.


Windows Defender

PlatformWindows 10 (64 bit)


Protection against malware infections
(such as viruses, worms or Trojan horses)
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Industry averageIndustry averageSeptember October
Protection against 0-day malware attacks, inclusive of web and e-mail threats (Real-World Testing) 202 samples used 99%100%96.3%
Detection of widespread and prevalent malware discovered in the last 4 weeks (the AV-TEST reference set) 9,797 samples used 98.5%99.5%99.9%
Protection Score 5.0/6.0


Average influence of the product on computer speed in daily usage
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Industry averageIndustry averageStandard PC Industry averageIndustry averageHigh end PC
Slowing-down when launching popular websites 39 websites visited 13%8%13%15%
Slower download of frequently-used applications 20 downloaded files 3%1%2%2%
Slower launch of standard software applications 11 test cases applied 17%16%12%16%
Slower installation of frequently-used applications 17 installed applications 23%42%36%61%
Slower copying of files (locally and in a network) 7,521 files copied 10%2%13%2%
Performance Score 5.0/6.0


Impact of the security software on the usability of the whole computer
(lower values indicate better results)
More information

Industry averageIndustry averageSeptember October
False warnings or blockages when visiting websites 500 samples used 0 0 0
False detections of legitimate software as malware during a system scan 1,425,641 samples used 13 17 21
False warnings concerning certain actions carried out whilst installing and using legitimate software 40 samples used 0 0
False blockages of certain actions carried out whilst installing and using legitimate software 40 samples used 0 0
Usability Score 4.0/6.0

Evaluation based on a point system

All products can achieve a maximum of 6 points each in the three categories of protection, performance and usability. This means 18 points are the best possible test result.
At 10 points or higher, a product is awarded the AV-TEST seal of approval.
At 17.5 points or higher, AV-TEST also issues the "TOP PRODUCT" award. Additional details ›






All tested manufacturers