Windows 10: Windows Defender isn't removing some of the threats

Defender notified me about 2 PUA's and I took the suggested action of removing them, but after I click on remove, it doesn't go. It shows that the threats are active. I uninstalled and removed the folder and the files/software which were affected but the threats are still there. The threats which I am getting are PUA:Win32/Presenoker and App:Cheat_Engine_BundleInstaller. I need some suggestions on how can I remove those completely.

:)

 

Windows defender false positive - forced to allow threat

Windows defender has started to identify C:\Windows\System32\mshta.exe as a threat [normally reported as a Trojan Powessere.G]. I use mshta.exe to run an hta custom MsgBox - I have been hoping to keep using my current CustomMsgBox tool [batch file calling a vbs-hta file] until later this year when I hope to have had enough time to replace it with a PowerShell alternative.

Windows defender's notification lets me "allow the threat" but that seems to me to be a bigger security hole than is necessary - it will now ignore a potentially real intrusion when all I want to run is a genuine Windows component. My immediate problem is fixed but I would prefer to fix the false positive using the exclusions list.

I cleared the 'Allowed threats history' so I could use the exclusions list instead. I added C:\Windows\System32\mshta.exe to the file exclusions list and I checked that it had taken properly by checking the exclusions list both in the UI & in the Registry. But the exclusion made no difference, it continued to detect and block the exe.

I have repeated the attempt several times [by clearing the allowed threats list & exclusions list beforehand] and the results are the same every time
- allowing the threat works,
- using the exclusions list has no effect.

I studied the relevant tutorial but have not spotted an error in what I have been doing - Add or Remove Windows Defender Exclusions

Does anybody with experience of using the exclusions list to counter false positives have any suggestions for me?

Denis

 

Windows Defender Doesnt Remove threats.

Can you give us what is/was the fully qualified name and
path to the file deemed to be a virus/trojan ?

It will be a lot easier to help you remove it once we know what it is and
where its saved into, as it appears under quarantine or on the list of detected items

`~`

I suggest you to use Windows Defender Offline in Safe mode and remove the virus and check if the issue is resolved.

Windows Defender Offline is a stand-alone tool that comes preloaded with the latest antimalware updates. It works outside of Windows, which means it can catch and clean infections that hide themselves when Windows is running.

• 
  Go to another PC that isn’t infected and download Windows Defender Offline.
  
• 
  Insert a blank USB flash drive or CD into the PC, and then run the Windows Defender Offline file that you just downloaded.
  
• 
  You will be prompted to install Windows Defender Offline to the blank USB flash drive or CD.
  
• 
  After you’ve installed Windows Defender Offline onto the USB flash drive or CD, insert it into your infected PC and
  restart in
  Safe Mode. You will be prompted to start the Windows Defender Offline tool.
  

The following articles may help if you're having trouble getting the tool to work:

• 
  Windows Defender Offline: frequently asked questions
  
• 
  Microsoft's Free Security Tools - Windows Defender Offline
  

After you've used Windows Defender Offline, you should make sure your security software is up to date and run a full scan:

• 
  Get the latest updates
  

Even if we've already detected and removed this particular threat, running a full scan might find other malware that is hiding on your PC.

Please post to us if the virus issue is resolved. We are glad to help you further.

-=-

 

Defender wont remove the threats

Hello,

Thank you for visiting Microsoft Community and providing us with the detailed description about the issue.

As per the description, I understand that you are experiencing issue with Windows Defender wont remove threats from the system.

I certainly understand your concern and will try my best to help you.

There might be a possibility that this issue might have occurred due to some third party security software that is installed on the system.

However, we need more information on this issue. Please answer this question so that we can understand this issue better.

• Did you make any significant changes to the computer prior to this issue?

I would suggest you to try the following methods and check if that helps.

Method 1:

Try re-starting the scan.

Sometimes restarting a scan can resolve issues such as this, where the scan can long or gets stuck.

If the issue persists, follow method 2

Method 2:

Windows Defender is taking long time to perform a full scan.



This issue happens due to temporary Internet files, cookies, and other app log files. To resolve this issue, it is recommended to remove all these files before you schedule a full scan.

Deleting the temporary files and the browsing history increases the performance of Internet Explorer. However, you can store the temporary files till the space allocated to it is completely filled up. So it is wise to delete
the files and the browsing history, every couple of months.

Please refer to these steps to remove all temporary files.

Delete the temporary files and the browsing history.

Reset Internet Explorer settings

http://windows.microsoft.com/en-us/internet-explorer/change-ie-settings#ie=ie-10

Note:
The Reset Internet Explorer Settings feature might reset security settings or privacy settings that you added to the list of Trusted Sites. The Reset Internet Explorer Settings feature might also reset parental control settings. We recommend that
you note these sites before you use the Reset Internet Explorer Settings feature. Resetting Internet Explorer isn't reversible, and all previous settings are lost after reset.

Follow the steps to Delete Browsing History.

Also, update the definition pack before you perform a full scan to remove the latest spyware.

How to manually download the latest definition updates for Windows Defender.

http://support.microsoft.com/kb/923159

I hope this information is helpful.

Please do let us know if you need any further assistance, we will be glad to assist you.

Thank you.

Jayant