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Security specialists have recently discovered a virus that makes its way
into the BIOS, making it very hard to get rid of using current
commercial anti-virus solutions.

The virus called Mebromi seems to be focused towards Chinese users,
especially AMI BIOS owners, but this doesn't mean that the rest of the
world is safe, as this could represent a gate opener for hackers who
want to make sure our computers remain under their control.


A full description of the way Mebromi functions was posted on the
Webroot Threat Blog, giving us an insight on how this malicious element
makes its way to the very core of a computer.

The BIOS rootkit, an MBR rootkit, a kernel mode rootkit, a PE file
injector and a Trojan downloader are the elements encapsulated in this
potentially destructive malware, which at the moment is unable to cause
any damage to machines running 64-bit operating systems if the user
privileges are limited.

The whole thing starts with a few files that try to access the kernel
to load the virus's own kernel driver that will later generate the
serious part of the infection.

After it successfully infects the BIOS using a file called Cbrom.exe,
which is a legitimate tool developed by Phoenix Technologies designed to
modify the Award/Phoenix system's ROM binaries, it moves to infecting
the master boot record of the device.

The winlogon.exe or wininit.exe files are also corrupted and injected
with codes that will generate the download of additional infections.

http://news.softpedia.com/news/Mebro...d-221702.shtml