Security > Analysis and Malware Removal

CMD appear and disappear when booting Win10 USB

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MEY:
It seems normal that a CMD appear and disappear when booting from a Win10 DVD made by Microsoft and sold on a DVD media.

But it doesn’t seem normal that a CMD appears and disappears when booting from a Win10 USB or burned DVD created by downloaded files from Microsoft.

In the beginning there didn’t appeared and disappeared any CMD when I booted from a Win10 USB. But after checking my outlook mail, it suddenly appeared. And I expect it to be caused by a rootkit or other type of malicious code. But I’m not totally sure.

I have tried to use PartedMagic NVME Secure Erase to delete all data on my SSD, but the CMD still appears when booting from USB.

If I go to the next page of the installation program and then abort the installation of Win10, the CMD doesn’t appear the next time I boot from the USB. But if I then continue the installation or abort the installation, the CMD appears again the next time I boot from the USB.

I therefore expect the appearance to be caused by a rootkit or other kind of malicious code either on the SSD or on the motherboard. If it was on the USB or other place, I would expect it to appear every time the pc booted from the Win10 USB.

If I’m right in the cause of the appearance of the CMD, I really hope someone can help me get rid of it as I haven’t got any luck with it in about half a year now.

Corrine:
Hi, MEY.  Welcome to LandzDown Forum.

Please follow the Log Posting Instructions.

Thank you.

winchester73:
https://www.bleepingcomputer.com/forums/t/711460/cmd-appear-and-disappear-when-booting-win-10-from-usb/

https://malwaretips.com/threads/cmd-appear-and-disappear-when-booting-windows-10-usb.97798/

It’s going to be vital that you follow instructions given at only one help site, otherwise confusion will reign supreme.

winchester73:
nasdaq has replied to you in the MalwareTips thread, and closed your BleepingComputer thread to avoid duplication ... I'd suggest you continue there since you haven't replied to Corrine here.

plodr:
He also posted at MajorGeeks
https://forums.majorgeeks.com/threads/cmd-appear-and-disappear-when-booting-win10-usb.321300/

and who knows how many other places we haven't looked in.

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