Windows 10: Why does Windows Defender Antivirus allow threats without notifying me? What is a "special...

Windows Defender Antivirus is ignoring threats and not notifying me full scan. It tells me the machine is not infected while displaying something else entirely in the MPlog file. I have no exclusions listed. What is a "special threatID" and why is any threat allowed on my machine without notifying me?Switch: MP_THREAT_ACTION_ALLOW6Line: Using signature default action MP_THREAT_ACTION_ALLOW6 for special threatID: 0xd1e8a0017ffffffeLog Lines: Internal signature match:subtype=Lowfi, sigseq=0x000053E7BB4DB404, sigsha=818723e64792e0724fa6dfc94578493cba68edbe, cached=false, source=0, resourcei

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Windows defender is continuously notifying "defender antivirus found threats"

Hi,

I am running Windows 10 Education version 1703 61-bit on an Intel Xeon(R) X5472 @3.00GHz processesor.

This morning I started receiving these notifications from the windows defender app "defender antivirus found threats." three or four times every minute. The defender app already scanned and found the threat. it also performed an offline scan. but is continuing
to notify multiple time a minute.

but when clicking on the notification the windows defender security center does not show any threat. the system has slowed down considerably.

What remedies should I apply.

Thank you

Best Regards

 

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

 

Defender notified threat.

As my AV am using Kasperski free plus MBAM free.
Also have set up Defender to do periodic scans (there being no conflict)

Defender has notified a threat and quarantined it.
Neither Kasperski or Mbam reported it.
Link below for info on threat.
Spyware:Win32/WebHancer.A [Microsoft] | ThreatExpert Statistics