Windows 10: Trojan:Win32/Malgent was not detected by defender or any other antivirus

I'm a Windows 11 user. I always keep my computer up to date. Also I have scanned my computer many times using Kaspersky premium, Kaspersky virus removal tool and Windows defender. But when I scanned my computer using Microsoft safety scanner, I found Trojan:Win32/Malgent malware in my computer. Why was windows defender unable to found that? Why any other antimalware program was unable to find that? What would this malware have done to me? Is this have caused because of a stealth rootkit? Please help ASAP

:)

 

Windows Defender detects an .exe as Win32/Bitrep.A Trojan?

OK, I had this software(earlier version) on another computer and never had it detected as a Trojan. I tried installing the latest version of this software on my new computer and it got detected as "Win32/Bitrep.A" Trojan after about a week of being installed
and Windows Defender deleted it. I tried re-downloading and then scanned the installation exe with Windows Defender and it detected it as the same Trojan. I then tried re-downloading again and Windows Defender deleted it as soon as it finished downloading.
The earlier version installation exe wasn't detected as a Trojan. I also tried a update exe to the software that wasn't the same version and nothing was detected. It seems to be with this certain version of the software or the update to this version. The developer
recommended installing the free version of Avast. Once installed, I scanned the installation exe with Avast and nothing was detected. Is there a Trojan with the software? According to Windows Defender there is. According to Avast there isn't.

* Moved from Windows 10/Security

 

Trojan- Win32/Dynamertic

I am trying to get rid of a Trojan called
win32/Dynamertic and windows defender detects the Trojan but is not able to remove it. Half way through the removal the PC just hangs and I have to go into Task Manger and close defender down. Tried on line and off line to remove the
virus but no luck. Today was my fourth try.

Is there a solution to getting rid of this Trojan???

 

How to remove Trojan: Win32\Dorv.Flrfn

Windows Defender detected Trojan: Win32\Dorv.Flrfn buried deep in an external hard drive. An error message appeared. I don't think the trojan was purged. I think a manual removal was recommended. How do I do this or is there another way to remove it?