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Ivan-2458 avatar image
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Ivan-2458 asked Ivan-2458 published

Do Trojans survive factory resets?

I recently got effected by a Trojan and because of it, I decided to do a factory reset but I've seen around that some viruses can hide in the BIOS or in the recovery partition and get installed back when you complete the the set up.
(I did a full reset)

So, do Trojans, the ones you get from email attachments, survive factory resets?

windows-10-security
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yagmoth555 avatar image
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yagmoth555 answered Ivan-2458 edited

Hi

It completely depend on the trojan/virus that you have, but yes certain can put themselves into the recovery partition, and other can destroy the partition altogether.

I suggest to do a clean install with a iso or media kit if you have one.

You can easily get an Windows 10 iso with the media creation tool from a working computer, and use that one. (https://www.microsoft.com/en-ca/software-download/windows10)

Thanks

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How many gigabytes is the iso file?
What will change if I reinstall windows again?
Whats the percentuage that the trojan entered the recovery partition? Is it a rare thing or common

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When you reinstall from your windows directly the trojan can still here, when you use an external usb key is a new windows with zero risk, you need to have a usb key with 8 GB (be careful your data can be deleted)

Have a great day!

Please don't forget to Accept as answer and upvote :)

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So if I reinstall windows from a iso file, the virus will be gone (if it is still in the pc obvisiouly) right?

Is it a rare or common thing that the trojan enters the recovery partition

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liroyben avatar image
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liroyben answered liroyben edited

Hello,

I advise you to reset your windows via an external usb key and not from windows, at the time of installation delete all the partitions of your hard drive.
https://www.microsoft.com/en-us/software-download/windows10

Have a great day!

Please don't forget to Accept as answer and upvote :)

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LimitlessTechnology-2700 avatar image
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LimitlessTechnology-2700 answered

Hello Ivan,

It totally depends on the virus/ Trojan and Considering the full reset, it is advisable to execute it using an external drive. and don't forget to backup your data.

Do follow the thread using the below link,

https://answers.microsoft.com/en-us/windows/forum/all/a-virus-or-trojan-or-worm-that-can-survive-a/9abe4fbb-7952-44b4-9936-2a7ec3d881ba



Hope this answers all your queries, if not please do repost back.
If an Answer is helpful, please click "Accept Answer" and upvote it : )

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Ivan-2458 avatar image
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Ivan-2458 answered Ivan-2458 published

Update: I just bought the USB flash drive and I am planning to do the installation tomorrow or the day after.
I saw some tutorials and some questions came into my mind:

  1. Do I need to delete all partitions? (Are D:\ partitions also in the list?)

  2. Does the installation of Windows 10 (from a usb flashdrive) delete all files, applications, softwares and settings? Basically a factory reset?

  3. In the installation of the Windows Media Creation Tool, it asks what media to use, should I click "ISO file" or "USB flash drive"? (I am using
    another computer to install the tool in the USB flash drive)

  4. How do I boot up the computer with the USB flash drive?


@yagmoth555 @LimitlessTechnology-2700
@liroyben

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