Akamai Technologies released a new cybersecurity threat advisory which alerts banks and enterprises to the use of Yummba webinject tools in banking fraud. The advisory is available for download here.
Zeus crimeware has a history of being used to control compromised hosts (zombies) for many types of cybercrime, including the harvesting of banking credentials, building botnets for distributed denial of service (DDoS) attacks, and targeting platform-as-a-service and software-as-a-service infrastructures.
The added capabilities of Yummba custom webinjects make the malware even more dangerous. Webinject attacks available for sale in the wild vary in sophistication from simple attacks that report account information and credential theft to highly advanced webinjects that utilize ATSEngine for automated fund transfers to attacker-controlled accounts.
Each Yummba webinject is customized to match the look-and-feel of a website of a specific financial institution to fool the user into entering banking credentials. What's more, the Yummba webinjects work with the malicious Automatic Transfer System (ATSEngine), streamlining the process of wiring a victim's funds to a third-party account. As a result, a malicious actor using Yummba webinjects can inject dynamic content into a web display when a customer visits an online banking site, steal information from the user's session, and immediately and automatically transfer funds out of the victim's accounts.
"PLXsert has identified more than 100 financial institutions for which active webinjects are available in the wild. Most are mid-size and large financial institutions in North America and Europe," said Stuart Scholly, senior vice president and general manager, Security Business Unit, Akamai. "Preventing these attacks requires user education, improved security and system hardening, and international cooperation and community cleanup."
PLXsert anticipates the underground crimeware ecosystem will continue to produce new and more powerful tools like Yummba webinjects to take advantage of the massive number of exploited devices on the Internet.
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