Security experts push free Gauss detection tools

Tools sniff for surveillance malware's custom font, which may hint at a 'zero-day' exploit

Two security organizations have released online tools that let Windows users check for possible infections by Gauss, the newly-revealed cyber surveillance malware thought to have been built by one or more governments.

Kaspersky Lab and the Laboratory of Cryptography and System Security (CrySys) at the Budapest University of Technology and Economics each published Gauss detection tools today.

Gauss, Kaspersky said yesterday, is a sophisticated threat that monitors financial transactions with Middle Eastern banks, perhaps as part of a wider investigation into the funding of terrorist groups. Kaspersky believes that Gauss was built by or under the auspices of a government, in large part because of coding practices that resemble those used in Flame, an advanced spying and data-stealing toolkit that targeted Iranian computers.

Flame, which was uncovered three months ago but may have been operating since mid-2008, was notable for its ability to fake the Windows Update service, then use that to infect up-to-date Windows PCs.

Kaspersky has rejected the idea that Gauss is a run-of-the-mill money-stealing Trojan.

Both CrySys and Kaspersky sniff out Gauss by looking for a custom-built font, dubbed "Palida Narrow," that the malware adds to infected machines.

CrySys first posted a detection tool that relied on the Palida Narrow strategy; Kaspersky took the same approach, but simplified it by inserting an IFRAME element into a Web page. The IFRAME uses JavaScript to check for the presence of the font.

The CrySys tool is available here, while Kaspersky's sniffer can be found here.

CrySys has played a prominent role in analyzing some of the malware that Kaspersky argued is linked to Gauss, including "Duqu," which is believed to have been crafted by the same team that built Stuxnet, the worm used to sabotage Iran's nuclear fuel enrichment program several years ago.

It's not yet clear why Gauss inserts the Palida Narrow font into infected PCs, or what purpose the new font serves. Some have speculated that it may hint at the use of a yet-undiscovered "zero-day" exploit of an unpatched vulnerability in word processing software, such as Microsoft Word.

Yesterday, Kaspersky senior researcher Roel Schouwenberg acknowledged that there are many facets of Gauss that remain mysterious, including whether it, like Stuxnet, relied on one or more unpatched bugs -- "zero days" in security speak -- to compromise personal computers.

Because one payload that Gauss installs is heavily encrypted, Kaspersky and other security firms cannot yet analyze it, and so cannot say whether it exploits unpatched vulnerabilities.

Kaspersky's Gauss infection-detection tool sniffs for the mysterious custom font that the malware installs.

"But I wouldn't be surprised that there is a zero-day [exploit] in that payload," Schouwenberg said in a Thursday interview.

Many antivirus programs, including those from Kaspersky and Symantec, also detect Gauss through their traditional signature-based software.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at @gkeizer, on Google+ or subscribe to Gregg's RSS feed. His email address is

See more by Gregg Keizer on

Read more about cyberwarfare in Computerworld's Cyberwarfare Topic Center.

Join the CSO newsletter!

Error: Please check your email address.
Show Comments

Featured Whitepapers

Editor's Recommendations

Solution Centres

Stories by Gregg Keizer

Latest Videos

  • 150x50

    CSO Webinar: The Human Factor - Your people are your biggest security weakness

    ​Speakers: David Lacey, Researcher and former CISO Royal Mail David Turner - Global Risk Management Expert Mark Guntrip - Group Manager, Email Protection, Proofpoint

    Play Video

  • 150x50

    CSO Webinar: Current ransomware defences are failing – but machine learning can drive a more proactive solution

    Speakers • Ty Miller, Director, Threat Intelligence • Mark Gregory, Leader, Network Engineering Research Group, RMIT • Jeff Lanza, Retired FBI Agent (USA) • Andy Solterbeck, VP Asia Pacific, Cylance • David Braue, CSO MC/Moderator What to expect: ​Hear from industry experts on the local and global ransomware threat landscape. Explore a new approach to dealing with ransomware using machine-learning techniques and by thinking about the problem in a fundamentally different way. Apply techniques for gathering insight into ransomware behaviour and find out what elements must go into a truly effective ransomware defence. Get a first-hand look at how ransomware actually works in practice, and how machine-learning techniques can pick up on its activities long before your employees do.

    Play Video

  • 150x50

    CSO Webinar: Get real about metadata to avoid a false sense of security

    Speakers: • Anthony Caruana – CSO MC and moderator • Ian Farquhar, Worldwide Virtual Security Team Lead, Gigamon • John Lindsay, Former CTO, iiNet • Skeeve Stevens, Futurist, Future Sumo • David Vaile - Vice chair of APF, Co-Convenor of the Cyberspace Law And Policy Community, UNSW Law Faculty This webinar covers: - A 101 on metadata - what it is and how to use it - Insight into a typical attack, what happens and what we would find when looking into the metadata - How to collect metadata, use this to detect attacks and get greater insight into how you can use this to protect your organisation - Learn how much raw data and metadata to retain and how long for - Get a reality check on how you're using your metadata and if this is enough to secure your organisation

    Play Video

  • 150x50

    CSO Webinar: How banking trojans work and how you can stop them

    CSO Webinar: How banking trojans work and how you can stop them Featuring: • John Baird, Director of Global Technology Production, Deutsche Bank • Samantha Macleod, GM Cyber Security, ME Bank • Sherrod DeGrippo, Director of Emerging Threats, Proofpoint (USA)

    Play Video

  • 150x50

    IDG Live Webinar:The right collaboration strategy will help your business take flight

    Speakers - Mike Harris, Engineering Services Manager, Jetstar - Christopher Johnson, IT Director APAC, 20th Century Fox - Brent Maxwell, Director of Information Systems, THE ICONIC - IDG MC/Moderator Anthony Caruana

    Play Video

More videos

Blog Posts