Why doesn't my Kaspersky detect malware installed on my PC ?

[jmdorropio]

SO: Windows 7 SP1 Home Premium x64 Build 7601

Antivirus: Kaspersky Plus, Updated, All active components

My PC has been a bit strange for a few weeks now. It turns off the antivirus by itself, the screen goes off, etc. I did a full scan of the disks many times and nothing was detected. The exception list is empty. I had to reinstall the K Plus twice, because it uninstalled itself. K Plus has the malware detection component installed and working. Nothing detected. I installed Malwarebytes and it immediately detected 19 malware installed on my PC and removed them.
I have always trusted Kaspersky's quality and now this happens.

Can you explain to me why K Plus does not detect viruses and lets itself be uninstalled by malware?
My trust in Kaspersky is very shaken. On top of that, my subscription only ends in 200 days 😞

[Berny]

@jmdorropio Welcome.

Under normal conditions Kaspersky doesn’t uninstall itself, can you please provide some details such as e.g. free disk space and RAM memory. Also , Windows 7 is end of life. Are you talking about 19 viruses or Adware issues ?

[jmdorropio]

Hello Berny. Thank you for your quick response.

I'm talking about 19 malware, that were already installed in the Windows registry. This Windows 7 SP1 is old but Kaspersky is not. Latest version, updated base date. The SO being old is no excuse.

If you want more details, I can provide them.

Physical Memory: Memory Usage    45 %
Total Physical    7.91 GB
Available Physical    4.35 GB
Total Virtual    16 GB
Available Virtual    12 GB

HDDs: Primary 440Gb, 119Gb free
Secundary: 698Gb, 92Gb free

[harlan4096]

Those detections are not actually considered as malware:

 

https://www.kaspersky.com/resource-center/definitions/what-is-pup-pua

 

Also, registry keys by their selves (without files) probably were just leftovers or remnants.

 

It's true that MalWareBytes has better detection in those types of Adware/PUP/PUA, Kaspersky in the last years has improved the detection of them, just be sure You have enabled these settings:

 

 

[Berny]

@jmdorropio

Also, please see → Not-a-Virus: What is it?

"Adware technically is not malicious ..."

[jmdorropio]

Yes, I always had these settings all enabled.

I don't have any remaining registry because I always use CCleaner.

I've been checking my PC for a while now looking for this week's symptoms. None of them have appeared yet. By this time tomorrow I should have some certainty that it was this malware that was preventing my PC, windows, bios and screen, from working perfectly.

They were definitely not PUPs. I never had adds or toolbars.

 

[jmdorropio]

It's confirmed. Since the malwarebytes disinfection, the PC has returned to normal, with the previous problems no longer occurring. I'm very disappointed with Kaspersky's product 😞