Want data? Scoop up those lost USB keys

Study finds none encrypted, most have data, two-thirds infected
  • Stilgherrian (CSO Online (Australia))
  • — 07 December, 2011 14:06
Lucky dip! Lost USB keys bought at NSW RailCorp's lost property auction yield personal data. (Photo: Sophos)

Lucky dip! Lost USB keys bought at NSW RailCorp's lost property auction yield personal data. (Photo: Sophos)

Lost USB memory keys make such rich and easy pickings for personal data that criminals must surely be onto this scam already. Their only risk is getting infected by the damn things.

In a study of 50 devices bought at the NSW RailCorp lost property auction in Sydney released today, Sophos found that none were encrypted or contained encrypted files, yet "many" contained personal or business information.

"We acquired these lawfully and now we've got them," Paul Ducklin, Sophos' head of technology for the Asia-Pacific region, told CSO Online.

Ducklin's lucky dip yielded lists of tax deductions, CVs and job applications, family photos and business data such as AutoCAD drawings, source code — and even the minutes of an activists' meeting.

"The good part is that we didn't find any obvious 'smoking guns'," Ducklin wrote in the report, "There were no visible plans for nuclear submarines, no insider trading tips, no credit card dumps, no criminal plots, and no US State Department cables dating back to the 1970s."

However two-thirds of the USB keys contained malware, mostly Mal/AutoInf-A autorun worms (16), Mal/Palevo-A (15), Mal/Inject-H (13), Mal/VB-AD (4) and others. The worst example had six different infections.

Ducklin wrote simple scripts on a netbook to take an image of each key without altering its data, check it for malware, and search for files. He chose to learn as little as possible yet still make the point.

Sophos didn't search for keywords across slack space or attempt to reconstruct deleted files. Nor did they search on the Spotlight indexing data on the nine keys that had clearly been used under OS X.

Imaging the keys was the slowest part, with data transfer speeds ranging from 7.5 megabytes per second (MBps) to 20MBps. Most were slower than the average hard drive.

"There wasn't any forensic art and science about this," Duckin said. Criminals could easily organise it on a mass scale.

"This could be done by someone who knew no more than how to open the lid of a laptop and insert USB keys," he said.

"You can image a key and then put it back. Apart from the fact that there are fingerprints on the key, or that it went missing for a while, no-one would know."

Contact Stilgherrian at Stil@stilgherrian.com or follow him on Twitter at @stilgherrian

Tags: encryption, NSW RailCorp, security, sophos, Sophos Paul Ducklin, storage, usb

Comments

Post new comment

The content of this field is kept private and will not be shown publicly.
Users posting comments agree to the CSO comments policy.
Login or register to link comments to your user profile, or you may also post a comment without being logged in.
CSO Corporate Partners
  • FirEye
  • Clear Swift
  • Trend Micro
  • Sophos
  • NetIQ
rhs_login_lockGet exclusive access to CSO, invitation only events, reports & analysis.
CSO Directory

Splunk for Security (Enterprise)

Splunk collects, indexes and harnesses all the fast moving machine data generated by your applications, servers and devices - physical, virtual and in the cloud.

Security Awareness Tip
Software security company www.clearswift.com gives some advice this holiday season to make sure employees don’t end up on Santa’s naughty list!


At a fundamental business level, social media is a useful additional tool for communicating and collaborating with customers, colleagues and new business prospects. From an HR point of view, the social web is not only useful for recruitment but also as a knowledge network. At an employee level, social media is changing the way we work: Employees increasingly expect to be able to access personal technology and services in the workplace. As the lines between work and home life blur, staff are looking for greater flexibility in their roles; working from home is an increasing trend, but so too is ‘home-ing from work’, where staff expect to be able to perform personal tasks at work.

But social media brings risk and reward to business in equal measure. Information security is a key concern: Many organisations view social media channels as yet another route along which sensitive data can escape from the business, whether accidentally or maliciously. On top of this, senior management may be concerned about the amount of time employees spend on social networks.

This cultural shift raises new questions about trust in the workplace, the balance of power in employer / employee relationship and levels of control over people and content.


Organisations using content and web security technology can manage the way their staff use email and the internet without having to resort to a default position of mistrust. With a whopping third of ANZ employers completely blocking social media access at work, there’s a real danger of throwing the benefits of collaboration out with the risks.


It doesn’t have to be that way.

Trust breeds responsibility: People underestimate the amount of company time they spend on personal browsing. Allow staff to view their own web usage and foster more responsible behaviour without undermining trust.


Know limits: Set clear limits on personal surfing and communicate them to users. Alert them when they are approaching their limit. Help your people to play by the rules.


Share the load: Spread responsibility for usage reporting among managers and department heads so everyone gets to see how their usage impacts on the rest of the organisation. This also gives managers greater control and visibility into usage.


Need to know: Yes, you need reports and visibility. What you don’t need is employee data becoming common knowledge. Access control means reporting can be adjusted on a need-to-know basis.


Security ABC Guides

7 Ways to Protect Your Business Printers

Can a hacker burn down your business by remotely setting one of your printers on fire? Researchers at Columbia University have recently proposed such a scenario, although HP quickly denied that it's possible. However, even if your printers can't be used as remote firestarters, there are many risks involved in networking a printer.