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Rewards plus: Fake mobile banking rewards apps lure users to install info-stealing RAT on Android devices

 Our analysis of a recent version of a previously reported info-stealing Android malware, delivered through an ongoing SMS campaign, demonstrates the continuous evolution of mobile threats. Masquerading as a banking rewards app, this new version has additional remote access trojan (RAT) capabilities, is more obfuscated, and is currently being used to target customers of Indian banks. The SMS campaign sends out messages containing a link that points to the info-stealing Android malware. The malware’s RAT capabilities allow the attacker to intercept important device notifications such as incoming messages, an apparent effort to catch two-factor authentication (2FA) messages often used by banking and financial institutions. The malware’s ability to steal all SMS messages is also concerning since the data stolen can be used to further steal users’ sensitive info like 2FA messages for email accounts and other personally identifiable information (PII).

This diagram illustrates the typical infection chain of this Android malware. The infection starts from an SMS message that contains a malicious link that leads to the malicious APK.
Figure 1. Typical SMS campaign attack flow

Our investigation of this new Android malware version started from our receipt of an SMS message containing a malicious link that led us to the download of a fake banking rewards app. The fake app, detected as TrojanSpy:AndroidOS/Banker.O, used a different bank name and logo compared to a similar malware reported in 2021. Moreover, we found that this fake app’s command and control (C2) server is related to 75 other malicious APKs based on open-source intelligence. Some of the malicious APKs also use the same Indian bank’s logo as the fake app that we investigated, which could indicate that the actors are continuously generating new versions to keep the campaign going.

This blog details our analysis of the recent version’s capabilities. We strongly advise users never to click on unknown links received in SMS messages, emails, or messaging apps. We also recommend seeking your bank’s support or advice on digital options for your bank. Further, ensure that your banking apps are downloaded from official app stores to avoid installing malware.

To read the full article at Microsoft click here

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