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Windows 7: Virus remains after formatting

24 Jul 2012   #11
DustSailor

Microsoft Windows 8.1 Pro 64-bit
 
 

fralo, if you have the license on the computer case, you might try to download/install the ISO (the same version as you have for the license) here: Official Windows 7 SP1 ISO from Digital River My Digital Life

You will need another computer with DVD write capabilities. Use this program to create a CD from the ISO you download: Microsoft Store Online

You can also use a USB stick, but I've come across complications doing it. It may work for you as I imagine my situation was unique: Windows 7 USB/DVD Download Tool - created by Darryl Licht

Also, as Karl above said, remove all other drives EXCEPT the C drive which you are installing the system to. The CD/dvd player should be the only other 'drive' connected. This includes all USB sticks. If you use a USB stick to install windows from, make sure it is FREE of viruses first.


My System SpecsSystem Spec
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24 Jul 2012   #12
karlsnooks

MS Windows 7 Ultimate SP1 64-bit
 
 

DustSailor,
I agree with your advise which is part of my motivation in asking where he got his Win 7. Possible is that the DVD is infected.

My experience has been that most people with USB problems actually have defective USBs. Sometimes by using clean all on the usb, then creating a partition, formatting the partition as NTFS, setting active then one can use the usb.
My System SpecsSystem Spec
24 Jul 2012   #13
metalmania31

Windows 7 Pro 64bit build 7601 SP1
 
 

OP, you don't have any other type of storage on the system during install do you? i.e. USB stick, other hdd's, any media in cd/dvd drive.
What about the possiblity of a bios infection?
My System SpecsSystem Spec
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25 Jul 2012   #14
Kevin Ismail

Windows 7 Ultimate x64
 
 

Thanks, Karl.
Haven't noticed that.

Then the only suspect is probably the installation CD/DVD, or any other that follows? That a bit weird though?

Edit:
Late posted, connection problem
My System SpecsSystem Spec
25 Jul 2012   #15
DustSailor

Microsoft Windows 8.1 Pro 64-bit
 
 

Quote   Quote: Originally Posted by karlsnooks View Post
DustSailor,
I agree with your advise which is part of my motivation in asking where he got his Win 7. Possible is that the DVD is infected.
Yes, mate. I too would question the CD. I skipped that part because you had already asked the question, so I just posted the bit on the ISO. Now we'll wait for the OP to respond to see the origins of this CD, or if it is possible the virus resides on a USB stick/other drive that has yet to be removed.

Quote   Quote: Originally Posted by karlsnooks View Post
My experience has been that most people with USB problems actually have defective USBs. Sometimes by using clean all on the usb, then creating a partition, formatting the partition as NTFS, setting active then one can use the usb.
Quite possible, though I had to do a sort of backwards install (upgrade version install in a business). The fault most likely rest with the upgrade ISO I was trying to boot from, instead of a full install (which I ended up using). The entire story is probably reserved for another time, however, and not on this thread. I don't want to go too far off topic, I have that problem
My System SpecsSystem Spec
27 Jul 2012   #16
F5ing

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by fralo View Post
Okay, I followed the instructions to no avail. But here's what I did step by step.

1) Booted from WINDOWS 7 CD.
2) At language screen, hit shift/f10 to go cmd prompt
3) diskpart
4) list disk
5) select disk 0
6) clean all
7) exit
8) exit

Now back at the install screen, I made it to the listing of partitions. Selected disk 0 (unallocated space).

After install, trojan remains.
If that 'clean all' completed without errors that disk should be clean (it took quite a while to complete, right?). The trojan must be coming from elsewhere.

Quote   Quote: Originally Posted by fralo View Post
It also affects the screen when booting up. There are different colors, checked background. Before it actually gets to the Starting Windows logo, there are a bunch of "aa" scattered across the screen.

Thank you all for your help thus far. I may have to just get a new hard drive.
I don't think you need a new hard drive.

As metalmania31 mentioned previously, you might investigate the possibility of a bios infection (very rare but possible), especially as you've noticed oddities in your pre-Windows boot screens. Can you get into the BIOS? If so, does it look the same as it always did?

When you say the trojan remains after reinstall, is it the same "Trojan.DNSChanger"? Is it another MalwareBytes run that identifies it?

And as others have mentioned you should suspect your other storage drives and install media.
My System SpecsSystem Spec
28 Jul 2012   #17
OldMX

Microsoft Windows 10 Professional
 
 

Lol, you dont have a bios infection, get real, if the virus survived a clean all disk command, then you have the infection somewhere, like where you store your personal stuff or downloads, time to check external disks, usb jumpdrives, etc.
My System SpecsSystem Spec
28 Jul 2012   #18
karlsnooks

MS Windows 7 Ultimate SP1 64-bit
 
 

Quote   Quote: Originally Posted by OldMX View Post
Lol, you dont have a bios infection, get real, if the virus survived a clean all disk command, then you have the infection somewhere, like where you store your personal stuff or downloads, time to check external disks, usb jumpdrives, etc.
Please read our tutorial on using the CLEAN ALL command.

You will see that no malware will survive.

I also rule out a virus infection, however, CLEAN ALL does not touch the bios.

True is that one must also use an offline malware removal program such as WDO, link in my signature, to make sure that UFDs and external disks are malware-free.
My System SpecsSystem Spec
28 Jul 2012   #19
karlsnooks

MS Windows 7 Ultimate SP1 64-bit
 
 

Fralo,
I noticed you never answered the question as to the source of your WIN 7. I can only assume then that the Win 7 is not from a legal source.

This tutorial will show you how to install and give you a link to a legal source to download a Win 7 ISO.
Clean Reinstall - Factory OEM Windows 7
My System SpecsSystem Spec
28 Jul 2012   #20
windude99

Windows 7 Professional x64 Service Pack 1
 
 

Try running Darik's Boot and Nuke to wipe the hard drive: Darik's Boot and Nuke - Use to Secure Wipe a Hard Drive
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 Virus remains after formatting




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