Cybersecurity researchers have uncovered a brand new variant of an Android banking trojan referred to as TrickMo that comes full of new capabilities to evade evaluation and show faux login screens to seize victims’ banking credentials.
“The mechanisms embody utilizing malformed ZIP recordsdata together with JSONPacker,” Cleafy safety researchers Michele Roviello and Alessandro Strino mentioned. “As well as, the appliance is put in by a dropper app that shares the identical anti-analysis mechanisms.”
“These options are designed to evade detection and hinder cybersecurity professionals’ efforts to research and mitigate the malware.”
TrickMo, first caught within the wild by CERT-Bund in September 2019, has a historical past of focusing on Android gadgets, significantly focusing on customers in Germany to siphon one-time passwords (OTPs) and different two-factor authentication (2FA) codes to facilitate monetary fraud.
The mobile-focused malware is assessed to be the work of the now-defunct TrickBot e-crime gang, over time regularly bettering its obfuscation and anti-analysis options to fly below the radar.
Notable among the many options are its potential to document display screen exercise, log keystrokes, harvest images and SMS messages, remotely management the contaminated gadget to conduct on-device fraud (ODF), and abuse Android’s accessibility companies API to hold out HTML overlay assaults in addition to carry out clicks and gestures on the gadget.
The malicious dropper app found by the Italian cybersecurity firm masquerades because the Google Chrome net browser that, when launched after set up, urges the sufferer to replace Google Play Companies by clicking the Verify button.
Ought to the consumer proceed with the replace, an APK file containing the TrickMo payload is downloaded to the gadget below the guise of “Google Companies,” following which the consumer is requested to allow accessibility companies for the brand new app.
“Accessibility companies are designed to help customers with disabilities by offering alternative routes to work together with their gadgets,” the researchers mentioned. “Nevertheless, when exploited by malicious apps like TrickMo, these companies can grant in depth management over the gadget.”
“This elevated permission permits TrickMo to carry out varied malicious actions, equivalent to intercepting SMS messages, dealing with notifications to intercept or conceal authentication codes, and executing HTML overlay assaults to steal consumer credentials. Moreover, the malware can dismiss keyguards and auto-accept permissions, enabling it to combine seamlessly into the gadget’s operations.”
Moreover, the abuse of the accessibility companies permits the malware to disable essential safety features and system updates, auto-grant permissions at will, and stop the uninstallation of sure apps.
Cleafy’s evaluation additionally uncovered misconfigurations within the command-and-control (C2) server that made it doable to entry 12 GB value of delicate information exfiltrated from the gadgets, together with credentials and photos, with out requiring any authentication.
The C2 server additionally hosts the HTML recordsdata used within the overlay assaults. These recordsdata embody faux login pages for varied companies, counting banks equivalent to ATB Cellular and Alpha Financial institution and cryptocurrency platforms like Binance.
The safety lapse not solely highlights the operational safety (OPSEC) blunder on the a part of the risk actors, but in addition places the victims’ information susceptible to exploitation by different risk actors.
The wealth of data uncovered from TrickMo’s C2 infrastructure might be leveraged to commit id theft, infiltrate varied on-line accounts, conduct unauthorized fund transfers, and even make fraudulent purchases. Even worse, attackers might hijack the accounts and lock the victims out by resetting their passwords.
“Utilizing private info and pictures, the attacker can craft convincing messages that trick victims into divulging much more info or executing malicious actions,” the researchers famous.
“Exploiting such complete private information ends in rapid monetary and reputational injury and long-term penalties for the victims, making restoration a posh and extended course of.”
The disclosure comes as Google has been plugging the safety holes round sideloading to let third-party builders decide if their apps are sideloaded utilizing the Play Integrity API and, if that’s the case, require customers to obtain the apps from Google Play in an effort to proceed utilizing them.
