How to find and remove a virus in a Xiaomi Redmi phone

Xiaomi Redmi smartphone owners often face intrusive advertising, strange interface behavior or sudden battery discharge, which may indicate malware penetration. Despite the built-in protection of MIUI Security, some threats are able to bypass standard filters, especially if the user installs applications from unknown sources. Understanding how the virus works in the Android system is the first step to effectively combat it.

In this article, we will discuss in detail the algorithms for detecting hidden threats, methods for forcible removal of them, and ways to prevent re-infection. Digital hygiene is as important as physical protection of the device, so you should not ignore the first symptoms.

The main signs of infection of the device

The first indicator of problems is often a sharp drop in performance. If your Xiaomi Redmi Note or older model began to noticeably slow down when switching between applications, this is a reason to be wary.

The second alarm is the appearance of banner ads on the desktop or in system notifications that cannot be closed. Adware is often masquerading as system processes or harmless utilities such as “cleaning up memory” or “flashlight”. It is also worth paying attention to traffic consumption: if statistics show abnormally high Internet consumption by an application that you hardly use, this is a clear sign of hidden data transfer.

• 📉 A sharp decrease in battery life and rapid heating of the body.
• 📢 Spontaneous opening of browsers and pop-up advertising.
• 🔒 Blocking settings or inability to remove an unknown application.
• 📲 New icons that you haven’t installed.

⚠️ Warning: If a device is locked on the screen and you want to transfer money (virus-blocker), do not pay the bill. This will not unlock the phone, but only confirm to the attackers that the victim is active.

Diagnostics through built-in antivirus MIUI

The first tool to use is the built-in security scanner, the MIUI system is based on the Avast or AVL engine (depending on the firmware version and region), which provides a basic level of protection. To start the check, you need to open the Security application (green icon with a shield) and click the Security Check button.

The scanning process takes a few minutes and checks the installed applications, system files and memory for known virus signatures. It is important to update the virus databases regularly in the settings of this application, as new threats appear daily, and if the built-in scanner finds a threat, it will prompt you to delete it or quarantine it.

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For maximum efficiency, close all running applications before starting the scanner so that the virus cannot hide its processes during the scan.

However, it is worth understanding the limitations of this method: some complex Trojans can masquerade as Android system processes, for example, called com.android.system.update. In such cases, the built-in antivirus can consider the file legitimate, skipping the threat. Therefore, relying only on regular tools is not always reasonable.

Use of third-party antivirus solutions

If standard testing fails but symptoms persist, you need to use "heavy artillery" to help third-party antiviruses like Kaspersky Internet Security, Dr.Web Light or Malwarebytes have deeper heuristic analysis algorithms that can detect threats by behavior, not just by signature databases.

When installing a third-party defender, make sure you download it exclusively from the official Google Play Market Store. APK-files from third-party sites at the time when the system may already be infected, carries high risks.

Special attention should be paid to the Anti-Virus and Real-Time Protection features in these applications, which can prevent malware from re-entering, and some antiviruses have URL-checking functionality, which is useful if a virus has entered your phone through a phishing site.

Analysis in Safe Mode (Safe Mode)

The most effective way to find and remove a virus that is hidden from routine checks is to download to Safe Mode, in which the Android operating system only runs with pre-installed system applications, blocking all third-party software, allowing you to see the "clean" system and remove the pest, which in normal mode can block access to settings.

To enter Safe Mode on most Xiaomi Redmi models, press the power off button. When the menu with the "Stop" and "Reset" buttons appears on the screen, press and hold your finger on the "Stop" icon. In a couple of seconds, a pop-up will appear suggesting that you switch to Safe Mode. Confirm the action.

When you reboot, you'll see in the corner of the screen, "Safe Mode." Now go to Settings → Apps → All apps. Look carefully for apps without a name, with an empty icon, or those you haven't exactly installed. Often viruses have names like "System Service," "Update," or just a set of characters.

⚠️ Warning: In Safe Mode, some sensor or network functions are not working, depending on the model. This is normal.

Manual verification of installed applications and access rights

Often viruses are disguised as useful utilities: calculators, scanners QR-Look carefully at the list of all programs, if you see an application that you don't remember or that was installed recently (before problems arose), it's a candidate for removal. Pay particular attention to applications that have permission to "overlay over other windows" or "Access to special features".

These permissions allow malware to intercept screen control, read keystrokes (keyloggers) or block the interface. You can check these rights in the Settings menu → Applications → Permissions. Revoke any suspicious permissions from unnecessary programs.

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Removing administrator rights is a key step without which many modern Trojans cannot be removed by standard methods.

Radical measures: Resetting and cleaning the system

If none of the above methods worked and the virus continues to be active, the last reliable way is a full reset to factory settings (Hard Reset), which completely removes all data from the internal drive, including viruses, photos, contacts and applications.

To perform the reset, go to Settings → About Phone → Reset → Erase all data. The system will request confirmation and input of the unlock password. Once the phone is rebooted, it will be like new. Important: do not restore applications from the backup immediately when you first set up, as the virus can be stored in the backup.

In particularly difficult cases, when the virus blocks login even in safe mode, you need to reset via the Recovery menu. To do this, turn off the phone completely, then press the Volume + and Power buttons simultaneously before the Mi logo appears. In the Recovery menu (manage volume buttons, select the power button), select Wipe Data → Wipe All Data.

Prevention of re-infection

After a successful cleanup, it is important to secure the result and prevent new attacks. The main reason for infection on Xiaomi Redmi is to install applications from unknown sources. In the security settings, always keep the Device Protection switch active and prevent installation. APK-files from browsers and messengers.

Update the operating system regularly MIUI. In security updates, Xiaomi is closing vulnerabilities through which viruses enter the phone. SMS from unknown numbers, even if they look like messages from banks or delivery services.

• 🛡️ Use only the official Google Play Store.
• 🔄 Regularly update the system and applications.
• 🚫 Disable the installation from unknown sources.
• 👁️ Read the permissions requested when installing.

⚠️ Warning: Hacked versions of paid games and software are the main source of Trojans. Free cheese is only in a mousetrap, and the price of such "free" software is your personal data and money on the map.

Frequently Asked Questions (FAQ)