BLACK HAT - Questions swirl around VM rootkit detection

At Black Hat, researcher presents new findings on rootkits, Vista security

Can rootkit malware that hides by mimicking a software-based virtual machine ever be detected? That was the topic of debate as security researchers presented their latest findings to packed audiences at the Black Hat Conference here.

Joanna Rutkowska, researcher at the firm Invisible Things, was the one who famously ignited the keen interest in virtualized rootkits after she described and demonstrated her rootkit creation, called Blue Pill, at last year's Black Hat.

Wednesday, Rutkowska returned to Black Hat to acknowledge that researcher Edgar Barbosa has come the closest to devising a method for detecting Blue Pill. "Congratulations to Edgar," she said, during the highly technical presentation she made with her colleague, researcher Alexander Tereshkin. Rutkowska said she and her colleague hadn't found a way yet to evade Barbosa's so-called counterbased detection method as detailed in a paper he made public in July at the SyScan conference.

Rutkowska also said she is posting the Blue Pill code publicly for download at the Blue Pill Project Web site. "You can freely upload Blue Pill right now," she said. Blue Pill has been developed in a number of variants since last year, including one based on nested hypervisors, where stealth, virtual-machine malware is nested inside other stealth, virtual-machine malware.

On a separate topic, she faulted Microsoft's code-signing security that requires a Microsoft-approved signed certificate for kernel-mode protection. Rutkowska last year had shown a way to break that security, which would let an attacker load malware on 64-bit Vista, but Microsoft fixed that problem a few months ago by changing an API. However, she asserted on Wednesday that she and Tereshkin had uncovered another route around Vista kernel protection: Faulty third-party drivers, which although digitally signed, are simply vulnerable.

She also noted that it was all too simple to obtain a Microsoft-approved code-signing certificate through a largely automated process that cost US$250 for a certificate. Microsoft was not immediately available to comment on Rutkowska's findings.

At an earlier session at Black Hat titled "Don't Tell Joanna, the Virtualized Rootkit is Dead," researchers Thomas Ptacek from Matasano Security, Nate Lawson from Root Labs, and Peter Ferrie from Symantec, labored to describe how they are on the path to detecting virtual-machine malware through three technical approaches. They described these technical approaches as side-channel attack, vantage-point attack and performance event counters.

In the end, however, Ptacek said the research was focused on detecting the presence of virtualization malware called Vitriol, created by researcher Dino Dai Zovi, for VMware. That's because Vitriol is one of only a few known examples of virtualization malware, and Rutkowska had declined to supply any Blue Pill code before the conference.

The three researchers indicated they intend to release their published findings, as well as a software framework they call Samsara for detecting virtualization malware, within a few days.

Recommended

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Ellen Messmer

Network World

Comments

Comments are now closed.

Most Popular Reviews

Follow Us

Best Deals on GoodGearGuide

Shopping.com

Latest News Articles

Resources

GGG Evaluation Team

Kathy Cassidy

STYLISTIC Q702

First impression on unpacking the Q702 test unit was the solid feel and clean, minimalist styling.

Anthony Grifoni

STYLISTIC Q572

For work use, Microsoft Word and Excel programs pre-installed on the device are adequate for preparing short documents.

Steph Mundell

LIFEBOOK UH574

The Fujitsu LifeBook UH574 allowed for great mobility without being obnoxiously heavy or clunky. Its twelve hours of battery life did not disappoint.

Andrew Mitsi

STYLISTIC Q702

The screen was particularly good. It is bright and visible from most angles, however heat is an issue, particularly around the Windows button on the front, and on the back where the battery housing is located.

Simon Harriott

STYLISTIC Q702

My first impression after unboxing the Q702 is that it is a nice looking unit. Styling is somewhat minimalist but very effective. The tablet part, once detached, has a nice weight, and no buttons or switches are located in awkward or intrusive positions.

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?