Hybrid GozNym malware targets customers of 24 financial institutions

GozNym combines Nymaim and Gozi Trojans to hit US, Canadian financial institutions

A group of cybercriminals have combined two powerful malware programs to create a new online banking Trojan that has already stolen millions of dollars from customers of 24 US and Canadian banks.

The new threat has been dubbed GozNym by researchers from IBM X-Force because it combines the stealthy Nymaim malware and the Gozi banking Trojan.

The new computer Trojan targets 22 websites that belong to banks, credit unions and e-commerce platforms based in the US, and two that belong to financial institutions from Canada. Business banking services appear to be a top target for GozNym's creators, according to the IBM researchers.

Nymaim is what researchers call a dropper. Its purpose is to download and run other malware programs on infected computers. It is usually distributed through Web-based exploits launched from compromised websites.

Nymaim uses detection evasion techniques such as encryption, anti-VM and anti-debugging routines, and control flow obfuscation. In the past, it has primarily been used to install ransomware on computers.

However, since November, the cybercriminal gang that controls Nymaim has switched to banking fraud. Specifically, the dropper started loading a DLL that is part of the Gozi ISFB malware and which is capable of injecting malicious code into Web browsing sessions. This technique is most frequently used to perform online banking fraud.

The integration between Nymaim and Gozi became complete in April, when a new version was discovered that combined code from both threats in a single new Trojan - GozNym.

"This malware is as stealthy and persistent as the Nymaim loader while possessing the Gozi ISFB Trojan’s ability to manipulate Web sessions, resulting in advanced online banking fraud attacks," the IBM X-Force researchers said in a blog post.

Join the PC World newsletter!

Error: Please check your email address.

Tags securitycybercriminalsransomwaremalwareHybrid GozNym

Our Back to Business guide highlights the best products for you to boost your productivity at home, on the road, at the office, or in the classroom.

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

Lucian Constantin

IDG News Service
Show Comments

Most Popular Reviews

Latest News Articles

Resources

PCW Evaluation Team

Azadeh Williams

HP OfficeJet Pro 8730

A smarter way to print for busy small business owners, combining speedy printing with scanning and copying, making it easier to produce high quality documents and images at a touch of a button.

Andrew Grant

HP OfficeJet Pro 8730

I've had a multifunction printer in the office going on 10 years now. It was a neat bit of kit back in the day -- print, copy, scan, fax -- when printing over WiFi felt a bit like magic. It’s seen better days though and an upgrade’s well overdue. This HP OfficeJet Pro 8730 looks like it ticks all the same boxes: print, copy, scan, and fax. (Really? Does anyone fax anything any more? I guess it's good to know the facility’s there, just in case.) Printing over WiFi is more-or- less standard these days.

Ed Dawson

HP OfficeJet Pro 8730

As a freelance writer who is always on the go, I like my technology to be both efficient and effective so I can do my job well. The HP OfficeJet Pro 8730 Inkjet Printer ticks all the boxes in terms of form factor, performance and user interface.

Michael Hargreaves

Windows 10 for Business / Dell XPS 13

I’d happily recommend this touchscreen laptop and Windows 10 as a great way to get serious work done at a desk or on the road.

Aysha Strobbe

Windows 10 / HP Spectre x360

Ultimately, I think the Windows 10 environment is excellent for me as it caters for so many different uses. The inclusion of the Xbox app is also great for when you need some downtime too!

Mark Escubio

Windows 10 / Lenovo Yoga 910

For me, the Xbox Play Anywhere is a great new feature as it allows you to play your current Xbox games with higher resolutions and better graphics without forking out extra cash for another copy. Although available titles are still scarce, but I’m sure it will grow in time.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?