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Legacy BIOS infectected with a Bootkit, compromised system.

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2 replies to this topic

#1 porfirio1830


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Posted 17 August 2015 - 04:12 PM

Recently I received a Laptop in my business with the following features:
1. MSI-U100/windowsXp
2. Once the OS is up, it deletes what I write and I can not navigate through the file manager because it
sends me always to the desktop.
3. I disconnected the HD from the Laptop.
4. I test it booting with a USB live Linux. Surprise! The laptop made the same things like point 2.
5. I disconnected the battery from CMOS RAM during 1 hour.
6. I did a Flash to the BIOS with the last update obtained from the website of MSI.
7. The Laptop keeps making the same thing like point 2.
8. I've tried with different distributions of Linux, and what I observed is that the
"thing which is inside BIOS" rises similar privileges like root or administrator, so in
this way it owns the Laptop.
9. My great question: How can I clean the BIOS and all the stuff related to the boot
process? In order to get a clean boot.
10. I would appreciate your sincere help.
Note 1:
I wiped the HD, the USB flash memory with DBAN with the highest levels of security.
I've tested the BIOS and it works well for 3 minutes or so and appears the problematic behaviour later.
When I say "I've tested" I mean with clean instalation of Windows and Linux.
I changed the motherboard in order to discard a malfunction of the keyboard and the keyboard works
What I noticed is that the problematic BIOS works well with FreeDos and I suspect that
the "rare thing in the BIOS" is not able to work at this level because I can edit text files without problems
and run some apps as a file-manager based on Dos without problems.
Now my question would be more specific:
Do you know about some tools to clean my BIOS that could run on FreeDos?
Note 2:
I've executed several popular antirootkit. Some of them report that they suspect of mbr rootkit activity.
But I don't know how to clean the BIOS.
Note 3:
This bug-BIOS doesn't allow me to install a clean windowsXp and makes the same behaviour of point 2 with Freedos at this moment.

Thanks for your attention.


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Posted 22 August 2015 - 04:15 PM

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