How to remove BrasDex malware (Android)

What is BrasDex malware

BrasDex is categorized as a banking virus that infects Android (and Windows) devices to access bank accounts and steal money from victims. This specific banker has been observed targeting victims in the Brazilian region – recently via a fake banking app named “Brazilian Banco Santander”. Previously, it used to infiltrate devices by disguising itself as essential Android settings applications. BrasDex abuses Accessibility Services to record the information entered into banking applications. However, instead of showing overlaid (fake) screens to bait users into entering their log-in credentials, it instead keyloggers them inside targetted banking applications themselves. Unlike other banking malware, BrasDex also employs an ATS (Automated Transfer System) mechanism, which allows cybercriminals to perform fraudulent transactions in an automated way – therefore automating malicious business and increasing illegal profits. In addition, it is also known that BrasDex exploits a popular Pix fast payment system that was developed by the Central Bank of Brazil. This makes its easier for cybercriminals since all they require is the victim’s identifier (which can be an email, CPF, phone number, or random ID). Please note that the Pxi system is not vulnerable – threat actors simply use this system to speed up the process of fraudulent transfers. A lot more technical information about BrasDex can be discovered in this report made by ThreatFabric. BrasDex is a dangerous virus that can cause unpleasant financial losses and privacy issues – thus, make sure to read our guide below and delete this devastating malware from your device. Once done, it is also important to change your log-in credentials.

How BrasDex malware infected your computer

As mentioned above, BrasDex has lately been spotted in distribution via a fake banking app called “Brazilian Banco Santander”. Earlier campaigns used to involve other fake Android system-related applications as well. Such apps may be spread through malicious ads, buttons, or links that suspicious download pages. In rarer yet also possible cases, banking malware may be delivered through trojanized apps that sneak to legitimate platforms like Google Play Store and get downloaded by users. And although such apps get reported and removed quite fast, they still manage to infect a number of innocent users. With regards to Windows users, BrasDex was detected in distribution through Casbaneiro trojan. This trojan was spread within a pushing e-mail about a failed delivery, ostensibly reported by the Brazilian postal service. The usage of phishing techniques in e-mail or SMS messages to fool users into clicking on suspicious links or downloading malicious attachments remains one of the most popular malware distribution techniques. The most popular argument as to why users should follow such message requests is echoed by outdated software, problems with a delivery, lack of Adobe Flash Player, unique lottery prizes, and other fake information meant to bamboozle naive and/or inexperienced users. Beware of such distribution channels and download only trusted and time-tested software, even from legitimate app markets like Play Store.

2. Manual removal

If you do not have any of the above-listed applications installed, but still experience the same symptoms of BrasDex malware, use these instructions to find the culprit. There are two traditional ways to do it. Both include checking the amount of battery and data resources demanded by the app. If there is a malicious program installed on your device, you will see excessively high resource demand by the malware. The steps listed below are similar on all Android-based smartphones.

To check Battery resources:

1. Find and open Settings on your device.
2. Among the list of settings, choose Battery.
3. Then tap on Battery Usage and check which application consumes the most (on top of the list).

To check data usage:

1. Open Settings as we did above.
2. Then choose something related to the network. Usually, it is called Connections.
3. Find and tap on Data Usage or similar. On some devices, you will see the overall usage of traffic immediately. If not, you have to choose WiFi and Mobile data usage separately.

After identifying which app causes the most resource consumption, you can navigate to Settings > Applications, find and delete the application you found. Before doing so, it higly-recommended to remove Administrative Privileges for the malicious app:

1. Go to Settings and find the Lock Screen and Security configuration.
2. Most smartphones have Advanced or Other security settings to open.
3. Then you should select something called Device Admin Apps.
4. Once done, find the malicious application you found before and Deactivate it.

If you are still unable to delete the stubborn app, we advise you to do it in Safe Mode. It ensures your smartphone is launched using only in-built and native features, which helps work around restrictions imposed by malicious software. Of course, BrasDex malware could block it as long as it has privileged rights, but still, give it a try if you have not done it yet. Here is how:

1. Push and hold the Power button until it opens the list of reboot options.
2. Then tap on and hold the Power off icon for a couple of seconds.
3. A new message will pop asking to boot in Safe Mode.
4. Confirm it and boot up your smartphone to affect the above steps in Safe Mode.

Once the deletion steps have been performed, you should no longer encounter the symptoms of the malicious BrasDex malware. We recommend you scout the list of installed applications for other suspicious presence that you do not remember installing. There is a chance BrasDex malware could install it upon.

3. Reset browser settings

After removing the application completely, it is important to clear your browser from malicious settings that could be installed by BrasDex malware. You will have to perform a couple of steps comprising full restoration of browser settings. Besides infecting your device, the virus could also crawl into your browser to impose various changes. For instance, content like push notifications and other types of banners popping right on the screen might come from your browser. You can run a step-by-step cleaning for each browser segment (browsing history, push-notifications, permissions. etc.) to remove any malware traces. However, rolling browser configuration back to factory settings is better because it wipes out everything accumulated inside of a browser making sure no unwanted content dwells around your smartphone. We will show you both step-by-step clean-ups and full factory reset for the most popular browsers including Google Chrome, Mozilla Firefox, and Opera.

Google Chrome:

At first, let’s clear browsing data.

1. Open Chrome browser and tap on Menu (3-dot icon in the top right corner).
2. Then go to History and choose Clear browsing data….
3. In the Advanced tab check all boxes and tap Clear data.

Then, we should disable push notifications.

1. Open the same Menu and choose Settings.
2. Then find and open Site Settings.
3. Scroll down a bit until you find Notifications.
4. Locate websites under Allowed, tap on them, and choose Clear & Reset.
5. You can also disable the Notifications feature to prevent websites from asking for permission completely.

As mentioned, you can also reset your browser to default settings so that you have it from scratch. This means that all of the data stored within the browser will be deleted and rolled back to the default configuration. Since we are dealing with malicious behavior, it is good to perform such steps to make sure nothing harmful persists inside of your browser. It is more robust and quicker than running each step like above.

1. Find and open Settings on your screen.
2. Go to Applications and search for Chrome.
3. Once found, tap on it and navigate to Storage > Manage Storage.
4. Finally, tap on Clear All Data and wait until the process is done.

Mozilla Firefox:

The process looks almost identical, only slightly different in the names of the steps. Nevertheless, we will show you how it looks like on Firefox as well. To clear browsing data:

1. Open Firefox and navigate to Menu likewise in Chrome.
2. Choose History and tap on Clear private data.
3. Select all of the entries and tap Clear Data.

To disable push notifications, follow these steps.

1. Open Firefox again.
2. Open Menu (either on top or below) and choose Settings.
3. Then, go to Site permissions > Notification.
4. Choose Blocked to not see notifications at all.

Up next is resetting browsing settings completely. To do this, simply follow all of the steps mentioned for Chrome above.

Opera:

Clearing browsing data in Opera looks like this:

1. Open Opera and tap on the browser logo below on the right.
2. Choose Settings, scroll down the list, and tap on Clear browsing data….
3. Click Advanced, check all of the boxes listed, and choose Clear Data.

In order to disable notifications in Opera:

1. Open Opera and tap on the browser logo below on the right.
2. Choose Settings and scroll down until you find Site Settings.
3. Click on it and choose Notifications.
4. Tap Block to remove all Notification permission.

Performing full Opera reset equals to what we mentioned in instructions for Chrome.

4. Perform a Factory Reset

If you continue to stumble upon weird smartphone behavior and suspect the virus is not deleted, the best solution is resetting the device itself. This step will remove all the data stored on your system and roll all configuration settings back to the default state. In other words, you will reinstall your system from scratch. This will delete the virus and clean your smartphone from other unnecessary stuff in case you have not cleaned it for a very long time. Before doing so, make sure there is no important data to lose. It is also worth jotting the names of Google accounts and other services because most people tend to forget them throughout their usage. After performing the Factory Reset, you will have to log in to all of your user accounts once more. Now you are ready to dive into resetting your device.

1. Open Settings and go to About phone.
2. Right there, you will see information about Android and UI versions, your CPU, RAM, Memory, and more.
3. Somewhere at the bottom, you will see the Reset button. Click on it and choose Factory Reset to erase all data and get your smartphone back to default settings.
4. Agree with everything promoted and wait until your device completes the reset. It might take 30 minutes or close.
5. Also, if you do not have the same location of settings and unable to find some of these steps, you can type Reset being in Settings and open it up.

In fact, you can find any setting you need using the search. It is our responsibility to provide detailed instructions so you have a full picture of the entire process.

Summary

We hope the instructions above were helpful, and you were able to eliminate all traces of BrasDex malware from your Android device and secure it. The provided tutorial is general and based on common malware detection and removal techniques. If you have any questions or additional information on the topic, please, share your thoughts in the comment section below.