IT Trenches

Aug 14 2009   12:48PM GMT

Bootkit – rootkit – malware bypasses disk encryption!

Troy Tate Profile: Troy Tate

If you have not been nervous before about someone infecting computers without your knowledge then you should be much more nervous after reading this article.

In 1987 the Stoned boot sector virus came out and was one of the most prevalent viruses of the early personal computer era. As with most malware concepts, this old threat has been made new again.

An 18-year old security specialist gave a presentation on a bootkit/rootkit (STONED) at the annual Blackhat security conference. This bootkit is not your typical bootkit in that it can bypass disk encryption and load itself into memory before the disk encryption software is activated. The demonstration showed the bootkit loading before disk encryption is activated. Once the malware is loaded from the master boot record (MBR), it is then in memory and can download other malware such as trojans to capture banking credentials.

The bootkit software can be installed either by having physical access to the device or by a user with administrative credentials (this makes a good case for the “least user authority” (LUA) principle). Once the malware is installed and activated it is very difficult to detect. According to one article:

Once installed, Stoned cannot be detected with traditional anti-virus software because no modifications of Windows components take place in memory, says Kleissner. Stoned runs in parallel with the actual Windows kernel. Even an anti-virus function in the BIOS can’t stop the bootkit, as modern Windows versions modify the MBR without referring to the BIOS.

Our challenge as infosec professionals is laid out before us. How we deal with threats like these and protect our users and organizations becomes more difficult all of the time. We have to stay on top of our game because the rules and game conditions are always changing.

Thanks for reading & let’s continue to be good network citizens.

1  Comment on this Post

 
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  • Mfrizzi
    Can't say this is much of a surprise, but I don't see how the data is at any risk here. As long as the [A href="http://www.sophos.com/products/enterprise/encryption"]encryption software [/A] is running, the data should be safe. The only real risk I see is that data could be transmitted elsewhere, where it could be unpacked over time.
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