How to remove FvncBot trojan from your Android device

What kind of malware is FvncBot?

FvncBot is a trojan targeting Android OSes (Operating Systems). It is a multifunctional malicious program that can execute various commands on infected devices and perform overlay attacks. In the autumn of 2025, FvncBot was discovered being distributed under the guise of an app associated with mBank – the fourth largest universal banking group in Poland.

FvncBot malware overview

FvncBot's infection chain is initiated by a loader. Disguised as the "Klucz bezpieczeństwa Mbank" ("Mbank security key"), the loader requests to install a "Play component" to ensure the application's safe and stable operation ("Komponent Play zapewnia bezpieczna i stabilna funkcjonalnosé aplikacji"). Following installation, users are instructed to press "AKTYWUJ" ("Activate") and thus execute FvncBot.

Like most Android-specific malicious programs, this malware exploits the Android Accessibility Services, which are intended to provide additional assistance with device interaction to users who require it. They are capable of reading the screen, providing keyboard input, simulating the touchscreen, and otherwise interacting with the device – hence, malicious software that abuses these services obtains their full functionality.

FvncBot utilizes several anti-detection techniques, including code obfuscation and the ability to bypass Accessibility Services restrictions for Android OSes 13 and later. Upon successful infiltration, FvncBot provides detailed instructions on how to enable the Android Accessibility Services.

Afterward, the trojan establishes communication with its C&C (Command and Control) server. Some of the commands FvncBot can execute include: obtaining a list of installed apps, opening applications (including homescreen, system settings, etc.), changing the volume level, muting/unmuting the device, opening the notification bar, locking/unlocking the device, performing gestures (e.g., click, swipe, scroll, etc.), simulating the keyboard, pasting text into input fields and clipboard, taking screenshots, recording keystrokes (keylogging), displaying overlays, and so on.

The malware's ability to carry out overlay attacks is its key functionality. When a victim opens a targeted application, FvncBot overlays it with a phishing screen that records data entered into it (e.g., log-in credentials, personally identifiable information, credit/debit card numbers, etc.). Alternatively, the malware could display a dark screen to hide its activities (e.g., fraudulent transactions, purchases, etc.). This trojan can also stream the victim's screen, almost in real-time.

It must be mentioned that malware developers often improve upon their software and techniques. Therefore, potential future variants of the FvncBot trojan could have additional/different functionalities and features.

To summarize, the presence of malicious software like FvncBot on devices can lead to severe privacy issues, financial losses, and identity theft.

Similar malware examples

We have written about countless malicious programs; Sturnus, Klopatra, and Datzbro are merely some of our newest articles on trojans similar to FvncBot.

Malware is a broad term covering software with a variety of malicious functionalities. These programs can be multifunctional or have a specific and limited purpose. However, regardless of how a piece of malicious software operates – its presence on a system endangers device integrity and user safety. Therefore, all threats must be eliminated immediately upon detection.

How did FvncBot infiltrate my device?

FvncBot has been observed being proliferated under the guise of a security app of Mbank. However, the distribution method is unknown. Generally, malware is spread by relying on phishing and social engineering tactics.

The most prevalent proliferation techniques include: suspicious download sources (e.g., freeware and free file-hosting sites, P2P sharing networks, third-party app stores, etc.), drive-by (stealthy/deceptive) downloads, malvertising, malicious attachments or links in spam (e.g., emails, PMs/DMs, social media posts, SMSes, etc.), online scams, pirated content, illegal software activation tools ("cracks"), and fake updates.

Some malicious programs can self-spread through local networks and removable storage devices (e.g., external hard drives, USB flash drives, etc.).

How to avoid installation of malware?

Caution is key to ensure device and user safety. Therefore, always research software by reading terms and expert/user reviews, reviewing required permissions, and verifying developer permissions. Download only from official and verified sources. Activate and update programs using legitimate functions/tools, as those acquired from third-parties can contain malware.

Be vigilant when browsing since the Internet is rife with deceptive and malicious content. Do not open attachments or links found in suspicious/irrelevant communications (e.g., emails, PMs/DMs, SMSes, etc.).

It is paramount to have a reputable antivirus installed and kept up-to-date. Security software must be used to perform regular system scans and to remove detected threats.

Steps provided by the loader to install FvncBot trojan (image source – Intel 471 Blog):

Steps provided by FvncBot trojan to enable the Accessibility Services (image source – Intel 471 Blog):

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 cyber criminals. 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 FvncBot malware, should I format my storage device to get rid of it?

Malware removal rarely requires formatting.

What are the biggest issues that FvncBot malware can cause?

The threats associated with an infection differ depending on the malware's capabilities and the attackers' goals. FvncBot is a trojan that can stream victims' screens, display phishing overlays, record keystrokes, and perform other malicious actions. Generally, high-risk malware is linked to severe privacy issues, financial losses, and identity theft.

What is the purpose of FvncBot malware?

Malware is predominantly used for profit. Other potential reasons include process disruption (e.g., websites, services, companies, etc.), attackers seeking amusement or exacting personal grudges, hacktivism, and political/geopolitical motivations.

How did FvncBot malware infiltrate my Android device?

While FvncBot's distribution is unknown, it has been disguised as mBank's security app. The most commonly used malware proliferation methods include: malvertising, spam emails/messages, online scams, drive-by downloads, dubious download sources, pirated content, fake updaters, and illegal software activation tools ("cracks"). Some malicious programs can self-spread through local networks and removable storage devices.

Will Combo Cleaner protect me from malware?

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