How to remove the Rokarolla banking trojan from Android

What kind of malware is Rokarolla?

Rokarolla is a banking trojan targeting Android devices. It abuses Accessibility Services to take near-complete control of infected phones and steal banking and cryptocurrency credentials. Rokarolla was first analyzed by Zimperium researchers Vishnu Pratapagiri and Fernando Ortega.

Rokarolla malware overview

In the samples reviewed, Rokarolla arrives disguised as a fake "TikTok 18+" app. A screen claims the device needs "age verification" to unlock adult content, then walks the victim through enabling Accessibility Services for the fake app step by step, arrows and all.

Once granted, a follow-up prompt asks the victim to let the app "have full control of your device," including viewing and controlling the screen and performing actions on the victim's behalf. Accepting this hands Rokarolla the permissions it needs to operate almost as if the attacker were physically holding the phone.

Zimperium's analysis found the malware supports 137 remote commands. These let a remote operator read and interact with whatever is shown on screen, since Accessibility Services can parse UI elements the same way a screen reader does.

Rokarolla is built to go after 217 specific banking and cryptocurrency apps. It displays fake login screens, essentially phishing overlays, on top of the real apps to capture usernames and passwords as the victim types them.

The same overlay technique is used against the lock screen itself, letting Rokarolla capture the device PIN or unlock pattern. Combined with keylogging and general input capture, this gives the operators multiple ways to record what a victim types.

Beyond credential theft, Rokarolla can take timestamped screenshots and stream them back to the attacker, functioning like a crude remote-desktop tool similar to VNC. It can also read and swap data on the clipboard, which is often abused to redirect copied cryptocurrency wallet addresses.

The malware harvests SMS messages, WhatsApp contacts, and call information, and can request to become the default SMS and phone app. From there it can silently intercept one-time passcodes sent by banks, send texts on the victim's behalf, and block incoming calls to keep fraud-alert calls from ever reaching the victim.

Rokarolla takes several steps to stay hidden. It disables Google Play Protect, hides its own icon from the app drawer, mutes sound and vibration while it works, and keeps the screen awake so its background activity is harder to notice. Its code is also obfuscated to slow down analysis.

The malware talks to its command-and-control servers over HTTPS, assigns each infected device a unique bot ID, and reports device details such as manufacturer, OS version, RAM, storage, screen size, battery level, locale, and time zone. It also relies on several backup domains, so taking one server offline does not necessarily stop the campaign.

It has to be mentioned that malware developers often improve upon their software and methodologies. Hence, potential future iterations of Rokarolla could have additional or different functionalities and features.

In summary, the presence of software like Rokarolla on devices can lead to multiple system infections, serious privacy issues, financial losses, and identity theft.

Conclusion

Rokarolla is a good example of how far Accessibility Service abuse has evolved on Android. A single permission grant, disguised as an age check, can end up giving an attacker near-total remote control over a phone and its banking apps.

Similar Android banking trojans and remote access tools are commonly seen in the wild. Some examples include OverlayPhantom, Massiv, and FvncBot.

How did Rokarolla infiltrate my device?

According to BleepingComputer, Rokarolla spreads through malicious websites that impersonate popular apps such as TikTok and Google Chrome, luring victims into downloading a fake installer.

In the observed samples, the app is presented as "TikTok 18+" and uses a fake age-verification screen to trick victims into enabling Accessibility Services, followed by a fake Google Play Protect scan meant to reassure the victim the app is safe.

More broadly, Android threats like this one are also distributed through third-party app stores, phishing links sent over messaging apps, malicious ads, and apps bundled with pirated or cracked software.

How to avoid installation of malware?

Only install apps from the official Google Play Store or a developer's verified website, and check an app's reviews, permission requests, and developer details before installing it.

Be especially cautious with any app that asks to enable Accessibility Services, become the default SMS handler, or "take full control" of the device, since legitimate apps rarely need this level of access. Keep the device and its apps updated, and run reliable mobile security software.

Rokarolla installation prompt impersonating TikTok 18+ (source: zimperium.com):

Rokarolla asking for accessibility permissions (source: zimperium.com):

Rokarolla asking for additional permissions (source: zimperium.com):

Quick menu:

• Introduction
• How to delete browsing history from the Chrome web browser?
• How to disable browser notifications in the Chrome web browser?
• How to reset the Chrome web browser?
• How to delete browsing history from the Firefox web browser?
• How to disable browser notifications in the Firefox web browser?
• How to reset the Firefox web browser?
• How to uninstall potentially unwanted and/or malicious applications?
• How to boot the Android device in "Safe Mode"?
• How to check the battery usage of various applications?
• How to check the data usage of various applications?
• How to install the latest software updates?
• How to reset the system to its default state?
• How to disable applications that have administrator privileges?

Delete browsing history from the Chrome web browser:

Tap the "Menu" button (three dots on the right-upper corner of the screen) and select "History" in the opened dropdown menu.

Tap "Clear browsing data", select "ADVANCED" tab, choose the time range and data types you want to delete and tap "Clear data".

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Disable browser notifications in the Chrome web browser:

Tap the "Menu" button (three dots on the right-upper corner of the screen) and select "Settings" in the opened dropdown menu.

Scroll down until you see "Site settings" option and tap it. Scroll down until you see "Notifications" option and tap it.

Find the websites that deliver browser notifications, tap on them and click "Clear & reset". This will remove permissions granted for these websites to deliver notifications. However, once you visit the same site again, it may ask for a permission again. You can choose whether to give these permissions or not (if you choose to decline the website will go to "Blocked" section and will no longer ask you for the permission).

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Reset the Chrome web browser:

Go to "Settings", scroll down until you see "Apps" and tap it.

Scroll down until you find "Chrome" application, select it and tap "Storage" option.

Tap "MANAGE STORAGE", then "CLEAR ALL DATA" and confirm the action by taping "OK". Note that resetting the browser will eliminate all data stored within. This means that all saved logins/passwords, browsing history, non-default settings and other data will be deleted. You will also have to re-login into all websites as well.

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Delete browsing history from the Firefox web browser:

Tap the "Menu" button (three dots on the right-upper corner of the screen) and select "History" in the opened dropdown menu.

Scroll down until you see "Clear private data" and tap it. Select data types you want to remove and tap "CLEAR DATA".

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Disable browser notifications in the Firefox web browser:

Visit the website that is delivering browser notifications, tap the icon displayed on the left of URL bar (the icon will not necessarily be a "Lock") and select "Edit Site Settings".

In the opened pop-up opt-in the "Notifications" option and tap "CLEAR".

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Reset the Firefox web browser:

Go to "Settings", scroll down until you see "Apps" and tap it.

Scroll down until you find "Firefox" application, select it and tap "Storage" option.

Tap "CLEAR DATA" and confirm the action by taping "DELETE". Note that resetting the browser will eliminate all data stored within. This means that all saved logins/passwords, browsing history, non-default settings and other data will be deleted. You will also have to re-login into all websites as well.

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Uninstall potentially unwanted and/or malicious applications:

Go to "Settings", scroll down until you see "Apps" and tap it.

Scroll down until you see a potentially unwanted and/or malicious application, select it and tap "Uninstall". If, for some reason, you are unable to remove the selected app (e.g., you are prompted with an error message), you should try using the "Safe Mode".

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Boot the Android device in "Safe Mode":

The "Safe Mode" in Android operating system temporarily disables all third-party applications from running. Using this mode is a good way to diagnose and solve various issues (e.g., remove malicious applications that prevent users you from doing so when the device is running "normally").

Push the "Power" button and hold it until you see the "Power off" screen. Tap the "Power off" icon and hold it. After a few seconds the "Safe Mode" option will appear and you'll be able run it by restarting the device.

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Check the battery usage of various applications:

Go to "Settings", scroll down until you see "Device maintenance" and tap it.

Tap "Battery" and check the usage of each application. Legitimate/genuine applications are designed to use as low energy as possible in order to provide the best user experience and to save power. Therefore, high battery usage may indicate that the application is malicious.

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Check the data usage of various applications:

Go to "Settings", scroll down until you see "Connections" and tap it.

Scroll down until you see "Data usage" and select this option. As with battery, legitimate/genuine applications are designed to minimize data usage as much as possible. This means that huge data usage may indicate presence of malicious application. Note that some malicious applications might be designed to operate when the device is connected to wireless network only. For this reason, you should check both Mobile and Wi-Fi data usage.

If you find an application that uses a lot of data even though you never use it, then we strongly advise you to uninstall it as soon as possible.

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Install the latest software updates:

Keeping the software up-to-date is a good practice when it comes to device safety. The device manufacturers are continually releasing various security patches and Android updates in order to fix errors and bugs that can be abused by cybercriminals. An outdated system is way more vulnerable, which is why you should always be sure that your device's software is up-to-date.

Go to "Settings", scroll down until you see "Software update" and tap it.

Tap "Download updates manually" and check if there are any updates available. If so, install them immediately. We also recommend to enable the "Download updates automatically" option - it will enable the system to notify you once an update is released and/or install it automatically.

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Reset the system to its default state:

Performing a "Factory Reset" is a good way to remove all unwanted applications, restore system's settings to default and clean the device in general. However, you must keep in mind that all data within the device will be deleted, including photos, video/audio files, phone numbers (stored within the device, not the SIM card), SMS messages, and so forth. In other words, the device will be restored to its primal state.

You can also restore the basic system settings and/or simply network settings as well.

Go to "Settings", scroll down until you see "About phone" and tap it.

Scroll down until you see "Reset" and tap it. Now choose the action you want to perform:
"Reset settings" - restore all system settings to default;
"Reset network settings" - restore all network-related settings to default;
"Factory data reset" - reset the entire system and completely delete all stored data;

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Disable applications that have administrator privileges:

If a malicious application gets administrator-level privileges it can seriously damage the system. To keep the device as safe as possible you should always check what apps have such privileges and disable the ones that shouldn't.

Go to "Settings", scroll down until you see "Lock screen and security" and tap it.

Scroll down until you see "Other security settings", tap it and then tap "Device admin apps".

Identify applications that should not have administrator privileges, tap them and then tap "DEACTIVATE".

Frequently Asked Questions (FAQ)

My Android device is infected with Rokarolla malware, should I format my storage device to get rid of it?

Formatting is usually unnecessary. Rokarolla can typically be detected and removed by running reputable mobile antivirus software such as Combo Cleaner.

What are the biggest issues that Rokarolla malware can cause?

Rokarolla can hijack Accessibility Services to take near-full control of a device, steal banking and cryptocurrency logins through fake overlays, and intercept SMS-based one-time passcodes.

It can also record the screen, harvest contacts and messages, and block fraud-alert calls from banks, which can lead to significant financial losses and identity theft.

What is the purpose of Rokarolla malware?

Most malware attacks are driven by profit. In Rokarolla's case, the goal is clearly financial: stealing banking and cryptocurrency credentials to drain victims' accounts and wallets.

How did Rokarolla malware infiltrate my Android device?

Rokarolla has been distributed through fake websites impersonating apps like TikTok and Chrome, using a dropper disguised as a Google Play Protect scan to install the malicious payload.

Will Combo Cleaner protect me from malware?

Combo Cleaner is capable of detecting and eliminating nearly all known malware infections. Remember that performing a complete system scan is essential since sophisticated malicious programs typically hide deep within systems.