Chaes Banking Trojan Hijacks Chrome Browser with Malicious Extensions

A financially-motivated malware campaign has compromised over 800 WordPress websites to deliver a banking trojan dubbed Chaes targeting Brazilian customers of Banco do Brasil, Loja Integrada, Mercado Bitcoin, Mercado Livre, and Mercado Pago.

First documented by Cybereason in November 2020, the info-stealing malware is delivered via a sophisticated infection chain that’s engineered to harvest sensitive consumer information, including login credentials, credit card numbers, and other financial information.

“Chaes is characterized by the multiple-stage delivery that utilizes scripting frameworks such as JScript, Python, and NodeJS, binaries written in Delphi, and malicious Google Chrome extensions,” Avast researchers Anh Ho and Igor Morgenstern¬†said. “The ultimate goal of Chaes is to steal credentials stored in Chrome and intercept logins of popular banking websites in Brazil.”

The attack sequence is triggered when users visit one of the infected websites, upon which a pop-up is displayed, urging them to install a fake Java Runtime application. Should the user follow through the instructions, the rogue installer initiates a complex malware delivery routine that culminates in the deployment of several modules.

Some of the intermediary payloads are not only encrypted but also hidden as commented-out code inside the HTML page of a Blogger blogspot domain (“awsvirtual[.]”). Read more:

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