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.

Perimeter

Attackers Divert Bank Phone Calls to Cover Tracks

Researchers at Trusteer uncover banking malware that steals telephone information to help attackers re-route calls from banks alerting customers to fraud.

A new version of a sneaky piece of banking malware has been armed with a new feature to help attackers cover their tracks.

According to Trusteer, certain new configurations of Ice IX – a modified variant of the Zeus platform – are capturing telephone account information belonging to their victims. The goal is to enable the attackers to divert calls from banks that are intended for the customer to telephones controlled by the attacker.

“We believe the fraudsters are executing fraudulent transactions using the stolen credentials and redirecting the bank’s post-transaction verification phone calls to professional criminal caller services…that approve the transactions,” noted Amit Klein, CTO of Trusteer.

In one attack observed by researchers at Trusteer, the malware stole the victim’s user ID and password as well as their secret question answer, date of birth and account balance at login. In the second phase of the attack, the victim is asked to update their home, mobile and work telephone information and select the name of their service provider from a drop-down list featuring three popular UK providers: British Telecommunications, TalkTalk and Sky. Next, the victim is asked to submit their telephone account number.

“This is very private data typically only known to the phone subscriber and the phone company,” explained Klein. “It is used by the phone company to verify the identity of the subscriber and authorize sensitive account modifications such as call forwarding. The fraudsters justify this request by stating this information is required as a part of verification process caused by "a malfunction of the bank’s anti-fraud system with its landline phone service provider".”

The end result is that attackers can circumvent attempts by the bank to alert customers via phone of malicious activity. Such activities are no longer rare, noted Liam O Murchu, manager of operations for Symantec Security Response.

“Common post-theft activities we’ve observed include acting as a man-in-the-browser, whereby the malware prevents the end user from seeing fraudulent transactions on the bank’s website, ensuring the victims do not suspect any nefarious activity has occurred behind the scenes,” he said. “We’ve been seeing this tactic for a few years. Another example of such activity is malware that modifies the banking webpage displayed in the browser in a manner to prevent certain actions, such as printing a statement, logging off, etc. One such threat is W32.Qakbot.”

Ice IX is actually one of the first spin offs of Zeus to appear last year after the Zeus source code was leaked. The malware is not particularly prevalent at this point, especially next to the native Zeus code’s binaries, Vikram Thakur, principal security response manager at Symantec, told Dark Reading.

“We think the reason for this is because most people who are feeding off the Zeus source code aren’t necessarily developers and simply compile and use what they already have in their possession,” he said.

“Zeus is by far the most prevalent banking malware in the wild today,” Murchu added. “That being said, there are other sophisticated pieces of malware in the wild that use rootkits to cover their tracks and are involved in siphoning information off one’s computer without specifically targeting banking information.”

Brian Prince is a freelance writer for a number of IT security-focused publications. Prior to becoming a freelance reporter, he worked at eWEEK for five years covering not only security, but also a variety of other subjects in the tech industry. Before that, he worked as a ... View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Microsoft Patches Wormable RCE Vulns in Remote Desktop Services
Kelly Sheridan, Staff Editor, Dark Reading,  8/13/2019
The Mainframe Is Seeing a Resurgence. Is Security Keeping Pace?
Ray Overby, Co-Founder & President at Key Resources, Inc.,  8/15/2019
GitHub Named in Capital One Breach Lawsuit
Dark Reading Staff 8/14/2019
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Current Issue
7 Threats & Disruptive Forces Changing the Face of Cybersecurity
This Dark Reading Tech Digest gives an in-depth look at the biggest emerging threats and disruptive forces that are changing the face of cybersecurity today.
Flash Poll
The State of IT Operations and Cybersecurity Operations
The State of IT Operations and Cybersecurity Operations
Your enterprise's cyber risk may depend upon the relationship between the IT team and the security team. Heres some insight on what's working and what isn't in the data center.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2019-15113
PUBLISHED: 2019-08-16
The companion-sitemap-generator plugin before 3.7.0 for WordPress has CSRF.
CVE-2019-15114
PUBLISHED: 2019-08-16
The formcraft-form-builder plugin before 1.2.2 for WordPress has CSRF.
CVE-2019-15115
PUBLISHED: 2019-08-16
The peters-login-redirect plugin before 2.9.2 for WordPress has CSRF.
CVE-2019-15116
PUBLISHED: 2019-08-16
The easy-digital-downloads plugin before 2.9.16 for WordPress has XSS related to IP address logging.
CVE-2017-18547
PUBLISHED: 2019-08-16
The nelio-ab-testing plugin before 4.6.4 for WordPress has CSRF in experiment forms.