Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Mobile

11/9/2020
06:10 PM
Connect Directly
Twitter
LinkedIn
RSS
E-Mail
50%
50%

New Brazilian Banking Trojan Targets Mobile Users in Multiple Countries

Ghimob is a full-fledged spy in your pocket, Kaspersky says.

A Brazil-based threat group that recently has been expanding its operations worldwide has deployed a new banking Trojan that is actively targeting Android users in multiple Latin American and European countries and could soon hit US users as well.

Researchers at Kaspersky recently discovered the so-called "Ghimob" remote access Trojan (RAT) while investigating another malware campaign. In a report this week, the security vendor described the malware as arriving on mobile devices via email purporting to be about some kind of debt.

Related Content:

3 Mobile Security Problems That Most Security Teams Haven't Fixed Yet

The Changing Face of Threat Intelligence

New on The Edge: Bug Bounty Hunters' Pro Tips on Chasing Vulns & Money

Recipients who fall for the scam and click on an embedded link in the email end up downloading the RAT on their devices. Once installed, Ghimob is capable of a variety of malicious actions that start with sending a message about successful infection to an attacker-controlled server.

The initial message includes data on phone model, a list of all applications on the device, and information on whether the user has implemented lock-screen security.

The Trojan, like a lot of Android malware, prompts users to grant it full access rights on the compromised device. Fabio Assolini, security researcher at Kaspersky, says that Ghimob, once installed, gives attackers complete remote control of the device. They can use it to take screenshots, use the microphone, and record all text typed in online fields and in mobile apps.

The Trojan can spy on 153 mobile apps, prevent manual uninstallation, install other apps from any source, and control the apps already installed — for instance, closing or opening an app or putting it in the background, Assolini says. "As the malware can take screenshots and act as a keylogger, any password typed or touched in the screen can be captured," he notes.

Ghimob can also record and replace any lock-screen pattern the user might have implemented to secure access to the device. Also, for fingerprint-based biometric authentication, the malware can put a black screen on the phone. "When the user tries to unlock the screen — using his fingerprint — the Trojan is using it to unlock any other financial app installed, tricking the user [into doing] it with his own fingerprint," Assolini says.

Because the malware uses the victim's own device to execute its fraudulent actions, most anti-fraud mechanisms at banks and other financial institutions trust the access and tend to accept the actions as legitimate, he says. In addition to bank accounts, Ghimob also targets apps from financial services companies, exchanges, and cryptocurrencies.

Brazilian Threat Actor
Kaspersky identified the group behind the malware as Guildma, a Brazilian threat actor associated with a set of four major banking Trojan families collectively referred to as the Tetrade. Until recently, the group has focused mostly on mobile device users in Brazil. But recently, it began aggressively expanding its operations and currently poses a threat to mobile banking users in multiple countries, including Angola, Germany, Mozambique, Paraguay, Peru, and Portugal, according to Kaspersky.

Assolini says it's unclear if Ghimob has targeted users in North America. But the malware is ready to steal data from multiple applications, including international payment systems in North America and other regions. "The Trojan is ready to steal credentials from several users," he says. "All it needs is the desire of the criminal, as addition of new targets in the malware seems pretty easy."

News of the Guildma group's apparent plans to target users around the world with its new mobile malware tool fits into a broader pattern. As smartphone use has increased, the devices have become attractive targets for attackers. Though the mobile device environment remains somewhat harder to crack than PCs and notebooks, attackers have ramped up campaigns targeting smartphones and tablets anyway.

Thirty-nine percent of organization's surveyed for Verizon's Mobile Security Index said they had experienced a mobile device-related security incident — many of them major — over the previous 12 months. Malware is a growing problem, but so too is adware and other potentially harmful applications.

 

Jai Vijayan is a seasoned technology reporter with over 20 years of experience in IT trade journalism. He was most recently a Senior Editor at Computerworld, where he covered information security and data privacy issues for the publication. Over the course of his 20-year ... View Full Bio
 

Recommended Reading:

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Attackers Leave Stolen Credentials Searchable on Google
Kelly Sheridan, Staff Editor, Dark Reading,  1/21/2021
How to Better Secure Your Microsoft 365 Environment
Kelly Sheridan, Staff Editor, Dark Reading,  1/25/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win an Amazon Gift Card! Click Here
Latest Comment: I can't find the back door.
Current Issue
2020: The Year in Security
Download this Tech Digest for a look at the biggest security stories that - so far - have shaped a very strange and stressful year.
Flash Poll
Assessing Cybersecurity Risk in Today's Enterprises
Assessing Cybersecurity Risk in Today's Enterprises
COVID-19 has created a new IT paradigm in the enterprise -- and a new level of cybersecurity risk. This report offers a look at how enterprises are assessing and managing cyber-risk under the new normal.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2021-21275
PUBLISHED: 2021-01-25
The MediaWiki "Report" extension has a Cross-Site Request Forgery (CSRF) vulnerability. Before fixed version, there was no protection against CSRF checks on Special:Report, so requests to report a revision could be forged. The problem has been fixed in commit f828dc6 by making use of Medi...
CVE-2021-21272
PUBLISHED: 2021-01-25
ORAS is open source software which enables a way to push OCI Artifacts to OCI Conformant registries. ORAS is both a CLI for initial testing and a Go Module. In ORAS from version 0.4.0 and before version 0.9.0, there is a "zip-slip" vulnerability. The directory support feature allows the ...
CVE-2021-23901
PUBLISHED: 2021-01-25
An XML external entity (XXE) injection vulnerability was discovered in the Nutch DmozParser and is known to affect Nutch versions < 1.18. XML external entity injection (also known as XXE) is a web security vulnerability that allows an attacker to interfere with an application's processing of XML ...
CVE-2020-17532
PUBLISHED: 2021-01-25
When handler-router component is enabled in servicecomb-java-chassis, authenticated user may inject some data and cause arbitrary code execution. The problem happens in versions between 2.0.0 ~ 2.1.3 and fixed in Apache ServiceComb-Java-Chassis 2.1.5
CVE-2020-12512
PUBLISHED: 2021-01-22
Pepperl+Fuchs Comtrol IO-Link Master in Version 1.5.48 and below is prone to an authenticated reflected POST Cross-Site Scripting