A New Android Banking Trojan Masquerades as Utility and Banking Apps in India

Authored by Dexter Shin

Over time, cyber threats focusing on Android units have grow to be extra refined and chronic. Just lately, McAfee Cell Analysis Crew found a brand new Android banking trojan focusing on Indian customers. This malware disguises itself as important companies, equivalent to utility (e.g., fuel or electrical energy) or banking apps, to get delicate info from customers. Some of these companies are very important for every day life, making it simpler to lure customers. We’ve beforehand noticed malware that masquerades as utility companies in Japan. As seen in such instances, utility-related messages, equivalent to warnings that fuel service will disconnect quickly until the invoice is checked, could cause important alarm and immediate rapid motion from the customers.

We’ve recognized that this malware has contaminated 419 units, intercepted 4,918 SMS messages, and stolen 623 entries of card or bank-related private info. Given the energetic malware campaigns, these numbers are anticipated to rise. McAfee Cell Safety already detects this risk as Android/Banker. For extra info, go to McAfee Cell Safety

Phishing by messaging platforms like WhatsApp

As of 2024, India is the nation with the best variety of month-to-month energetic WhatsApp customers. This makes it a major goal for phishing assaults. We’ve beforehand launched one other Banker distributed by way of WhatsApp. Equally, we suspect that the pattern we lately discovered additionally makes use of messaging platforms to succeed in particular person customers and trick them into putting in a malicious APK. If a person installs this APK, it’ll enable attackers to steal the sufferer’s monetary knowledge, thereby engaging in their malicious purpose.

Determine 1. Scammer messages reaching customers by way of Whatsapp (supply: reddit)

Contained in the malware

The malware we first recognized was pretending to be an app that allowed customers to pay their fuel payments. It used the emblem of PayRup, a digital cost platform for public service charges in India, to make it look extra reliable to customers.

Determine 2. Malware disguised as fuel payments digital cost app

As soon as the app is launched and the permissions, that are designed to steal private knowledge equivalent to SMS messages, are granted, it asks the person for monetary info, equivalent to card particulars or checking account info. Since this malware pretends to be an app for paying payments, customers are prone to enter this info to finish their funds. On the financial institution web page, you possibly can see main Indian banks like SBI and Axis Financial institution listed as choices.

Determine 3. Malware that requires monetary knowledge

If the person inputs their monetary info and tries to make a cost, the information is distributed to the command and management (C2) server. In the meantime, the app shows a cost failure message to the person.

Determine 4. Cost failure message displayed however knowledge despatched to C2 server

One factor to notice about this app is that it could actually’t be launched straight by the person by the launcher. For an Android app to look within the launcher, it must have “android.intent.class.LAUNCHER” outlined inside an within the AndroidManifest.xml. Nevertheless, since this app doesn’t have that attribute, its icon doesn’t seem. Consequently, after being put in and launched from a phishing message, customers could not instantly understand the app continues to be put in on their machine, even when they shut it after seeing messages like “Financial institution Server is Down”, successfully conserving it hidden.

Determine 5. AndroidManifest.xml for the pattern

Exploiting Supabase for knowledge exfiltration

In earlier studies, we’ve launched numerous C2 servers utilized by malware. Nevertheless, this malware stands out on account of its distinctive use of Supabase, an open-source database service. Supabase is an open-source backend-as-a-service, just like Firebase, that gives PostgreSQL-based database, authentication, real-time options, and storage. It helps builders shortly construct purposes with out managing backend infrastructure. Additionally, it helps RESTful APIs to handle their database. This malware exploits these APIs to retailer stolen knowledge.

Determine 6. App code utilizing Supabase

A JWT (JSON Net Token) is required to make the most of Supabase by its RESTful APIs. Apparently, the JWT token is uncovered in plain textual content inside the malware’s code. This supplied us with a singular alternative to additional examine the extent of the information breach. By leveraging this token, we had been capable of entry the Supabase occasion utilized by the malware and achieve priceless insights into the size and nature of the information exfiltration.

Determine 7. JWT token uncovered in plaintext

Throughout our investigation, we found a complete of 5,558 information saved within the database. The primary of those information was dated October 9, 2024. As beforehand talked about, these information embody 4,918 SMS messages and 623 entries of card info (quantity, expiration date, CVV) and financial institution info (account numbers, login credentials like ID and password).

Determine 8. Examples of stolen knowledge

Uncovering variants by package deal prefix

The preliminary pattern we discovered had the package deal title “gs_5.buyer”. Via investigation of their database, we recognized 8 distinctive package deal prefixes. These prefixes present crucial clues in regards to the potential rip-off themes related to every package deal. By inspecting the package deal names, we will infer particular traits and sure focus areas of the assorted rip-off operations.

Primarily based on the package deal names, plainly as soon as a rip-off theme is chosen, at the very least 2 totally different variants are developed inside that theme. This variability not solely complicates detection efforts but additionally will increase the potential attain and impression of their rip-off campaigns.

Cell app administration of C2

Primarily based on the data uncovered to this point, we discovered that the malware actor has developed and is actively utilizing an app to handle the C2 infrastructure straight from a tool. This app can ship instructions to ahead SMS messages from the sufferer’s energetic telephones to specified numbers. This functionality differentiates it from earlier malware, which generally manages C2 servers by way of internet interfaces. The app shops numerous configuration settings by Firebase. Notably, it makes use of Firebase “Realtime Database” quite than Firestore, seemingly on account of its simplicity for fundamental knowledge retrieval and storage.

Determine 9. C2 administration cell software

Conclusion

Primarily based on our analysis, we have now confirmed that 419 distinctive units have already been contaminated. Nevertheless, contemplating the continuous improvement and distribution of latest variants, we anticipate that this quantity will steadily enhance. This development underscores the persistent and evolving nature of this risk, emphasizing the necessity for cautious remark and versatile safety methods.

As talked about initially of the report, many scams originate from messaging platforms like WhatsApp. Subsequently, it’s essential to stay cautious when receiving messages from unknown or unsure sources. Moreover, given the clear emergence of assorted variants, we advocate utilizing safety software program that may shortly reply to new threats. Moreover, by using McAfee Cell Safety, you possibly can bolster your protection in opposition to such refined threats.

Indicators of Compromise (IOCs)

APKs:

Domains:

• https[://]luyagyrvyytczgjxwhuv.supabase.co

Firebase:

• https[://]call-forwarder-1-default-rtdb.firebaseio.com

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