Source code for powerful Android banking malware is leaked

More attacks are expected as cybercriminals use the code

The source code for a powerful Android malware program that steals online banking credentials has been leaked, according to researchers with IBM.

The malware family is known by several names, including GM Bot, Slempo, Bankosy, Acecard, Slempo and MazarBot. 

GM Bot has been sold on underground hacking forums for around US$500. But it appears someone who bought the code then leaked it on a forum in December, perhaps to increase his standing, wrote Limor Kessem, a cybersecurity analyst with IBM Trusteer.

The person included an encrypted archive file containing the source code of GM Bot, according to Kessem.

"He indicated he would give the password to the archive only to active forum members who approached him," Kessem wrote. "Those who received the password in turn passed it on to other, unintended users, so the actual distribution of the code went well beyond that discussion board’s member list."

The source code of powerful banking trojans has been leaked before with apps such as Zeus, SpyEye and Carberp, Kessem wrote.

"While GM Bot may not be as prolific as the major banking Trojans mentioned here, it is definitely a game changer in the realm of mobile threats," Kessem added.

GM Bot emerged in late 2014 on Russian-speaking forums. It exploits an issue known as activity hijacking in older Android devices that allow an overlay to be displayed over a legitimate application.

Google has put in defenses against activity hijacking in Android versions higher than 5.0.

The overlay looks like what a user would expect to see after launching a legitimate banking app, but that app is actually running underneath the overlay. The user then inputs their authentication credentials, which are sent to the attackers.

Since GM Bot has full control over the device, it can also steal SMSes, such as one-time authentication codes.

"Previous mobile malware — before overlays became commercially available to fraudsters — could steal SMS codes, but those would have been meaningless without phishing schemes or a trojan on the victim’s PC to steal access credentials," Kessem wrote.

Since the leak of GM Bot's code, it appears its creators have developed a second version "which is sold in financial fraud-themed underground boards," Kessem wrote.

Join the newsletter!

Error: Please check your email address.
Rocket to Success - Your 10 Tips for Smarter ERP System Selection
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Jeremy Kirk

IDG News Service
Show Comments

Father’s Day Gift Guide

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

David Coyle

Brother PocketJet PJ-773 A4 Portable Thermal Printer

I rate the printer as a 5 out of 5 stars as it has been able to fit seamlessly into my busy and mobile lifestyle.

Kurt Hegetschweiler

Brother PocketJet PJ-773 A4 Portable Thermal Printer

It’s perfect for mobile workers. Just take it out — it’s small enough to sit anywhere — turn it on, load a sheet of paper, and start printing.

Matthew Stivala

HP OfficeJet 250 Mobile Printer

The HP OfficeJet 250 Mobile Printer is a great device that fits perfectly into my fast paced and mobile lifestyle. My first impression of the printer itself was how incredibly compact and sleek the device was.

Armand Abogado

HP OfficeJet 250 Mobile Printer

Wireless printing from my iPhone was also a handy feature, the whole experience was quick and seamless with no setup requirements - accessed through the default iOS printing menu options.

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.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?