A Few Weirdest Of Scenarios Unsolved?

Question

I encountered 2 weird scenarios that i'd like to share with you?.While using the M.D.A. on it's own,my computer managed to download 20 Eicar test files without any warning popups on the screen and the second scenario was the M.D.A. had no issues with infected downloaded and installed and explored files/programs,nor did the M.D.A. have any issues of any installed malwares viruses trojans.I can also mention that the installed M.D.A also showed a 0% detection rates after doing a custom scan of an infected program/s and only found out the program was infected after moving to any free antivirus or by sending the infected program to VirusTotal.com for a second opinion scan,that has so far been 100% successful with its end results scan.VirusTotal.com scan feature for some unknown reason knows the difference between a safe file/program and a dangerous one?.I also went to one of your websites http://demo.w.d.microsoft.com and it clearly shows the end results after an attempt was made to download an Eicar test file/s,and the M.D.A. was showing to have taken actions each time,but sadly my M.D.A. didn't show the exact end results as shown by that website, once after an Eicar was downloaded.My M.D.A. was totally okay with it.Still not solved in 2026?

Answer 1

It sounds like you are experiencing some significant issues with Microsoft Defender Antivirus (M.D.A.) regarding its detection capabilities. Here are a few points to consider based on the context provided:

1. Detection of Eicar Test Files: Microsoft Defender Antivirus is designed to detect known threats, including test files like Eicar. If it is not detecting these files, it may indicate a configuration issue or that the real-time protection feature is not enabled.
2. Zero Detection Rates: If you are seeing a 0% detection rate after a custom scan, it could be due to several factors, including the possibility that the definitions are out of date or that the software is not functioning correctly. Microsoft continuously updates its detection capabilities, and sometimes new malware may not be recognized immediately until sufficient data is gathered.
3. Comparison with Other Scanners: Using services like VirusTotal can provide additional insights, as they aggregate results from multiple antivirus engines. If other scanners are detecting issues that Microsoft Defender is not, it may be worth investigating the settings and ensuring that all features of Microsoft Defender are properly configured and up to date.
4. User Participation: Microsoft encourages users to submit unknown or suspicious software for analysis, which helps improve their detection capabilities. If you encounter files that are not being detected, consider submitting them to Microsoft for further analysis.

If these issues persist, you might want to check for updates to Microsoft Defender or consider reaching out to Microsoft support for more tailored assistance.

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References:

• How Microsoft identifies malware and potentially unwanted applications
• Advanced technologies at the core of Microsoft Defender Antivirus