Real-World Protection Test February-May 2021
|Test Period||February - May 2021|
|Number of Testcases||736|
|Online with cloud connectivity|
|False Alarm Test included|
Malicious software poses an ever-increasing threat, not only due to the number of malware programs increasing, but also due to the nature of the threats. Infection vectors are changing from simple file-based methods to distribution via the Internet. Malware is increasingly focusing on users, e.g. by deceiving them into visiting infected web pages, installing rogue/malicious software or opening emails with malicious attachments. The scope of protection offered by antivirus programs is extended by the inclusion of e.g. URL-blockers, content filtering, cloud reputation systems, ML-based static and dynamic detections and user-friendly behavior-blockers. If these features are perfectly coordinated with the signature-based and heuristic detection, the protection provided against threats increases.
In this test, all protection features of the product can be used to prevent infection – not just signatures or heuristic file scanning. A suite can step in at any stage of the process – accessing the URL, downloading the file, formation of the file on the local hard drive, file access and file execution – to protect the PC. This means that the test achieves the most realistic way of determining how well the security product protects the PC. Because all of a suite’s components can be used to protect the PC, it is possible for a product to score well in the test by having e.g. very good behavioral protection, but a weak URL blocker. However, we would recommend that all parts of a product should be as effective as possible. It should be borne in mind that not all malware enters computer systems via the Internet, and that e.g. a URL blocker is ineffective against malware introduced to a PC via a USB flash drive or over the local area network.
In spite of these technologies, it remains very important that also conventional and non-cloud features such as the signature-based and heuristic detection abilities of antivirus programs continue to be tested. Even with all the protection features available, the growing frequency of zero-day attacks means that some computers will inevitably become infected. As signatures can be updated, they provide the opportunity to recognize and remove malware which was initially missed by the security software. Other protection technologies often offer no means of checking existing data stores for already-infected files, which can be found on the file servers of many companies. Those security layers should be understood as an addition to good detection rates, not as a replacement.
The Real-World Protection test is a joint project of AV-Comparatives and the University of Innsbruck’s Faculty of Computer Science and Quality Engineering. It is partially funded by the Republic of Austria.
The methodology of our Real-World Protection Test has received the following awards and certifications, including:
- Constantinus Award – given by the Austrian government
- Cluster Award – given by the Standortagentur Tirol – Tyrolean government
- eAward – given by report.at (Magazine for Computer Science) and the Office of the Federal Chancellor
- Innovationspreis IT – “Best Of” – given by Initiative Mittelstand Germany
Unfortunately, we cannot provide results for Microsoft Defender. During the testing, despite being configured for automatic updates and performing manual updates, parts of Defender were not correctly updated. As there were no error messages, this issue was only discovered at the beginning of June and required a new installation of the OS.
Testing dozens of antivirus products with hundreds of URLs each per day is a great deal of work, which cannot be done manually (as it would involve visiting thousands of websites in parallel), so it is necessary to use some sort of automation.
Every potential test-case to be used in the test is run and analyzed on a clean machine without antivirus software, to ensure that it is a suitable candidate. If the malware meets these criteria, the source URL is added to the list to be tested with security products. Any test cases which turn out not to be appropriate are excluded from the test set.
Every security program to be tested is installed on its own test computer. All computers are connected to the Internet. Each system is manually updated every day, and each product is updated before every single test case. Each test PC has its own external IP address. We make special arrangements with ISPs to ensure a stable Internet connection for each PC, and take the necessary precautions (with specially configured firewalls etc.) not to harm other computers (i.e. not to cause outbreaks).
The tests were performed under a fully patched Microsoft Windows 10 64-Bit. The use of up-to-date third-party software and an updated Microsoft Windows 10 64-Bit makes it very hard to find exploits in-the-field. Users should always keep their systems and applications up-to-date, in order to minimize the risk of being infected through exploits which use unpatched software vulnerabilities.
Our Real-World Protection Test aims to simulate real-world conditions as experienced every day by users. If user interactions are shown, we choose “Allow” or equivalent. If the product protects the system anyway, we count the malware as blocked, even though we allow the program to run when the user is asked to make a decision. If the system is compromised, we count it as user-dependent. We consider “protection” to mean that the system is not compromised. This means that the malware is not running (or is removed/terminated) and there are no significant/malicious system changes. An outbound-firewall alert about a running malware process, which asks whether or not to block traffic from the users’ workstation to the Internet, is too little, too late and not considered by us to be protection.
Preparation for every testing day
Every morning, any available security software updates are manually downloaded and installed. Before each test case is carried out, the products have some time to download and install automatically newer updates which have just been released, as well as to load their protection modules (which in several cases takes some minutes). If a major signature update for a product is made available during the day, but fails to download/install before each test case starts, the product will at least have the signatures that were available at the start of the day. This replicates the situation of an ordinary user in the real world.
Testing Cycle for each malicious URL
Before browsing to each new malicious URL we update the programs/signatures (as described above). New major product versions (i.e. the first digit of the build number is different) are installed once at the beginning of the month, which is why in each monthly report we only give the main product version number. Our test software monitors the PC, so that any changes made by the malware will be recorded. Furthermore, the recognition algorithms check whether the antivirus program detects the malware. After each test case the machine is reset to its clean state.
Security products should protect the user’s PC and ideally, hinder malware from executing and perform any actions. It is not very important at which stage the protection takes place. It could be while browsing to the website (e.g. protection through URL Blocker), while an exploit tries to run, while the file is being downloaded/created or when the malware is executed (either by the exploit or by the user). After the malware is executed (if not blocked before), we wait several minutes for malicious actions and to give e.g. behavior-blockers time to react and remedy actions performed by the malware. If the malware is not detected and the system is indeed infected/compromised (i.e. not all actions were remediated), the process goes to “System Compromised”. If a user interaction is required and it is up to the user to decide if something is malicious, and in the case of the worst user decision the system gets compromised, we rate this as “user-dependent”. Because of this, the yellow bars in the results graph can be interpreted either as protected or not protected (it’s up to each individual user to decide what he/she would probably do in that situation).
Due to the dynamic nature of the test, i.e. mimicking real-world conditions, and because of the way several different technologies (such as cloud scanners, reputation services, etc.) work, it is a matter of fact that such tests cannot be repeated or replicated in the way that e.g. static detection rate tests can. Anyway, we log as much data as reasonably possible to support our findings and results. Vendors are invited to provide useful log functions in their products that can provide the additional data they want in the event of disputes. After each testing month, manufacturers are given the opportunity to dispute our conclusion about the compromised cases, so that we can recheck if there were maybe some problems in the automation or with our analysis of the results.
In the case of cloud products, we can only consider the results that the products achieved in our lab at the time of testing; sometimes the cloud services provided by the security vendors are down due to faults or maintenance downtime by the vendors, but these cloud-downtimes are often not disclosed to the users by the vendors. This is also a reason why products relying too heavily on cloud services (and not making use of local heuristics, behavior blockers, etc.) can be risky, as in such cases the security provided by the products can decrease significantly. Cloud signatures/reputation should be implemented in the products to complement the other local/offline protection features, but not replace them completely, as e.g. offline cloud services would mean the PCs are being exposed to higher risks.
We aim to use visible and relevant malicious websites/malware that are currently out there, and present a risk to ordinary users. We usually try to include as many working drive-by exploits as we find – these are usually well covered by practically all major security products, which may be one reason why the scores look relatively high. The rest are URLs that point directly to malware executables; this causes the malware file to be downloaded, thus replicating a scenario in which the user is tricked by social engineering into following links in spam mails or websites, or installing some Trojan or other malicious software.
We use our own crawling system to search continuously for malicious sites and extract malicious URLs (including spammed malicious links). We also search manually for malicious URLs.
In this kind of testing, it is very important to use enough test cases. If an insufficient number of samples are used in comparative tests, differences in results may not indicate actual differences in protective capabilities among the tested products. Our tests use more test cases (samples) per product and month than any similar test performed by other testing labs. Because of the higher statistical significance this achieves, we consider all the products in each results cluster to be equally effective, assuming that they have a false-positives rate below the industry average. Read more in this paper.
We use statistical methods like hierarchical cluster analysis (using average linkage between groups) to group the results and see at what level of similarity the clusters are joined. Products that have above-average FPs (wrongly blocked score) are downgraded according to the ranking system below. Products with over 100 FPs are downgraded to Tested.
|Ranking system||Protection score
|< / = ∅ FPs||Tested||Standard||Advanced||Advanced+|
|> ∅ FPs||Tested||Tested||Standard||Advanced|
|> 100 ∅ FPs||Tested||Tested||Tested||Tested|
False Positive (False Alarm) Test Result
The false-alarm test in the Real-World Protection Test consists of two parts: wrongly blocked domains (while browsing) and wrongly blocked files (while downloading/installing). It is necessary to test both scenarios because testing only one of the two above cases could penalize products that focus mainly on one type of protection method, either URL filtering or on-access/behaviour/reputation-based file protection.
a) Wrongly blocked domains (while browsing)
We used around five-hundred randomly chosen popular domains. Blocked non-malicious domains/URLs were counted as false positives (FPs). The wrongly blocked domains have been reported to the respective vendors for review and should now no longer be blocked.
By blocking whole domains, the security products not only risk causing a loss of trust in their warnings, but also possibly causing financial damage (besides the damage to website reputation) to the domain owners, including loss of e.g. advertisement revenue. Due to this, we strongly recommend vendors to block whole domains only in the case where the domain’s sole purpose is to carry/deliver malicious code, and otherwise block just to the malicious pages (as long as they are indeed malicious). Products which tend to block URLs based e.g. on reputation may be more prone to this and score also higher in protection tests, as they may block many unpopular/new websites.
b) Wrongly blocked files (while downloading/installing)
We used around one thousand different applications listed either as top downloads or as new/recommended downloads from various download portals. The applications were downloaded from the original software developers’ websites (instead of the download portal host), saved to disk and installed to see if they are blocked at any stage of this procedure. Additionally, we included a few clean files that were encountered and disputed over the past months of the Real-World Protection Test.
The duty of security products is to protect against malicious sites/files, not to censor or limit the access only to well-known popular applications and websites. If the user deliberately chooses a high security setting, which warns that it may block some legitimate sites or files, then this may be considered acceptable. However, we do not regard it to be acceptable as a default setting, where the user has not been warned. As the test is done at points in time and FPs on very popular software/websites are usually noticed and fixed within a few hours, it would be surprising to encounter FPs with very common applications. Due to this, FP tests which are done e.g. only with very popular applications, or which use only the top 50 files from whitelisted/monitored download portals would be a waste of time and resources. Users do not care whether they are infected by malware that affects only them, just as they do not care if the FP count affects only them. While it is preferable that FPs do not affect many users, it should be the goal to avoid having any FPs and to protect against any malicious files, no matter how many users are affected or targeted. Prevalence of FPs based on user-base data is of interest for internal QA testing of AV vendors, but for the ordinary user it is important to know how accurately its product distinguishes between clean and malicious files.
The below table shows the numbers of wrongly blocked domains/files:
|FPs / User-dependent FPs
[lower is better]
|ESET, Kaspersky||0 / 0 (0)||0|
|Vipre||1 / 0 (1)||1|
|Total AV, Total Defense
||2 / 0 (2)||2|
||3 / 0 (3)||3|
|G Data||3 / 1 (4)||3.5|
|Bitdefender||5 / 0 (5)||5|
|McAfee||6 / 0 (6)||6|
|K7||7 / 6 (13)
|average (14)||average 13
|Avast, AVG||19 / 2 (21)||20|
|NortonLifeLock||22 / 1 (23)||22.5|
|Trend Micro||36 / 0 (36)||36|
|Panda||38 / 0 (38)||38|
||52 / 0 (52)||52|
 Although user dependent cases are extremely annoying (esp. on clean files) for the user, they were counted only as half for the “wrongly blocked rate” (like for the protection rate).
To determine which products have to be downgraded in our award scheme due to the rate of wrongly blocked sites/files, we backed up our decision by using statistical methods and by looking at the average scores. The following products with above-average FPs have been downgraded: Avast, AVG, NortonLifeLock, Trend Micro, Panda, and Malwarebytes.
Test period: February – May 2021 (736 Test cases)
|Blocked||User dependent||Compromised||Protection Rate*||Cluster|
Total Defense, Vipre
* … Protection Rate = [Blocked % + (User dependent % / 2)]
Award levels reached in this Real-World Protection Test
The awards are decided and given by the testers based on the observed test results (after consulting statistical models). The following awards are for the results reached in this Real-World Protection Test:
* these products got lower awards due to false alarms
Expert users who do not care about wrongly blocked files/websites (false alarms) or user-dependent detections, are free to rely on the protection rates instead of our awards ranking which takes those in consideration
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This publication is Copyright © 2021 by AV-Comparatives ®. Any use of the results, etc. in whole or in part, is ONLY permitted after the explicit written agreement of the management board of AV-Comparatives prior to any publication. AV-Comparatives and its testers cannot be held liable for any damage or loss, which might occur as result of, or in connection with, the use of the information provided in this paper. We take every possible care to ensure the correctness of the basic data, but a liability for the correctness of the test results cannot be taken by any representative of AV-Comparatives. We do not give any guarantee of the correctness, completeness, or suitability for a specific purpose of any of the information/content provided at any given time. No one else involved in creating, producing or delivering test results shall be liable for any indirect, special or consequential damage, or loss of profits, arising out of, or related to, the use or inability to use, the services provided by the website, test documents or any related data.
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