This page describes how to exchange the Video BIOS (VBIOS) of a Robin or Woodpecker module. For exchanging the VBIOS, the CBROM.EXE is needed. This tool is provided by Phoenix Technologies and Toradex is not allowed to send a copy to the customers. Therefore Toradex offers the service of exchanging the VBIOS for the fee of one support hour. Please contact the Toradex support for more information.

WARNING

Cbrom Exe Bios Download

It uses the CBROM command-line tool to hook its extension into the BIOS. The next time the system boots, the BIOS extension adds additional code to the hard drive's master boot record (MBR) in order to infect the winlogon.exe / winnt.exe processes on Windows XP and 2003 / Windows 2000 before Windows boots. BIOS-Mods.com for years has been and continues to be an open, collaborative space to help users around the world make the most of their motherboards, hardware platforms, and computers as a whole. Over the years, we have had many talented developers come and go who have all left tremendous impacts on our ability to modify BIOS images and provide.

The exchange of the VBIOS is a fundamental change in the BIOS image. If the modification is not done correctly, the board might not boot anymore. Use a baseboard with a second BIOS image for recovering corrupted BIOS images. If you do not have such a baseboard, be aware of the risk. The VBIOS modification is on your own risk.
For customer that want avoid the risk or do not have the CBROM.EXE tool, Toradex offers the service of changing boot logos for the fee of one support hours. If you are interested, please contact the Toradex support team. If you are planing to do the VBIOS exchanging on your own, please contact the Toradex support for getting the latest BIOS version. Not all BIOS versions are compatible with the EMGD/IEGD VBIOS. The module might not boot if you use an older BIOS image with a EMGD/IEGD VBIOS.

Creating a Customized VBIOS

A customized VBIOS can be created by either using the Intel Embedded Media and Graphics Driver (EMGD) or Intel Embedded Graphics Driver (IEGD) Configuration Editor. In order to get the VBIOS, you need to select Video BIOS in the Package editor. The generated VBIOS can be tested under DOS. Please take a look to the documentation coming with the EMGD/IEGD (search for TSR). If you are planing to use our service to exchange the VBIOS, please test the VBIOS prior to send it to us. Toradex can not do tests with the customer display.

Exchange the Video BIOS

After exchanging the Video BIOS, the chipset micro code (CMC) has to be relinked to the image. Otherwise the BIOS does not boot anymore. The easiest way to obtain the CMC is to extract it from the current BIOS image:

Next step is to remove the old VBIOS from the BIOS image:

Cbrom Exe Bios Update

Now the new VBIOS can be included in the BIOS image:

IMPORTANT: do not forget the last step, the relinking of the chipset micro code:

The modified BIOS image can now be flashed to the Woodpecker or Robin module by using the Awdflash or Torflash tool.

We have seen many discussions of the MyBios “Bioskit” discovered at the end of 2011. MyBios was the first malware to successfully infect the Award BIOS and survive the reboot. It was first discovered by a Chinese security company; many other security vendors published detailed analyses after that.

We have seen a lot of samples targeting the master boot record (MBR) to survive a reboot and reinfect a system. We found a sample in our collection that infected the MBR. Further investigation showed that the next variant of the malware was a Bioskit. The first variant of the malware was an executable that infected the MBR; the second was a DLL with the Bioskit component. We will discuss the second variant in this blog.

DLL Analysis

The malware’s main dropper is a DLL that is responsible for the MBR infection. It reads the original MBR from Sector 0 and writes it to Sector 15.

4000 divya prabandham tamil pdf format online. MyBios code writes the malicious MBR.

The malware overwrites the original MBR in sector 0 and writes the file to be dropped (the downloader) in hidden sectors. The DLL copies itself to the Recycle folder and deletes itself. The downloader is dropped and executed every time the system is started.

The malicious MBR

The next two screens show the malicious MBR code, which reads the original MBR from Sector 15 into memory at location 0000:7c00. Control passes to the original MBR at this location and the system boots in the normal way.

Usually the boot sector is read to this memory location in a clean system after the power-on self-test and INT 19 jumps to location 0000:7c00.

The malicious MBR at 7c00 before the interrupt

The original MBR at 7c00 after the interrupt

All the components dropped will be present in the DLL, including the utility cbrom.exe from the BIOS manufacturer, which the malware uses to flash the BIOS.

Dropped System File

Cbrom Exe Biosphere

The sys file responsible for flashing the BIOS is similar to the one seen in MyBios. Unlike bios.sys, the code to check the BIOS manufacturer and the BIOS size is present in the DriverEntry. However, the functionality of both the drivers remains the same.

Code to check for Award BIOS

The rest of the code responsible for backing up and flashing the BIOS is present in the driver dispatch. A graph showing the code flow of both MyBios and the Niwa rootkit can be seen below.

Cbrom Exe Bioskop

MyBios code flow

NIWA code flow

What’s interesting is that the strings observed in both malware are almost identical.

MyBios:
City racing mod for pc. This is not an Aword BIOS!

NIWA:
This not an Aword BIOS!

Identical strings:
Flash Aword BIOS form disk c bios.bin success.
SMI_AutoErase Aword Bios Failed.
ExAllocatePool read file NonPagedPool failed.
Backup Aword BIOS to disk c bios.bin success.
MmMapIoSpace physics address:0x%x failed.

It cannot be a coincidence that almost all of the strings are identical (including misspellings and bad grammar). This suggests the same individual or group is behind both of these BIOS-flashing malware.

McAfee detection and cleaning

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McAfee detects this infection as “Niwa!mem” and successfully cleans the MBR infection and deletes all other malicious dropped components.

Conclusion

We have now seen two Bioskit malware in the wild within a couple of months. When the first Bioskit was identified, we did not know how s