Xiaomi and Redmi smartphone owners often face intrusive advertising or strange behavior of the system, suspecting a virus attack. Indeed, the Android operating system, which runs MIUI, is the most common platform for mobile malware. However, you should not panic ahead of time, since many symptoms can be eliminated with simple cleaning methods.
Before we take drastic measures, we need to diagnose the problem accurately. Often users confuse system errors or aggressive optimization of background processes with the activity of viruses. In this article, we will discuss how to distinguish a real threat from a failure, and provide a step-by-step algorithm of actions to completely clean your device.
Modern smartphones have powerful security features, but the human factor remains a weak link: installing applications from unknown sources or clicking on dubious links opens the door for Trojans and miners. Understanding the mechanisms of penetration of malicious code will help you not only remove it, but also prevent re-infection in the future.
The main signs of infection of the smartphone
The first signal that your Redmi has malware is a sharp drop in performance, the phone starts to heat up even in standby mode, and the battery runs out in a matter of hours, because virus processes consume CPU resources for their tasks, such as mining cryptocurrency or sending spam.
Another obvious symptom is the appearance of banner ads on the desktop or in system windows, where they should not be. If you notice that the browser opens tabs with questionable content, or applications are launched without your participation, this is a reason for immediate check.
- 🔥 The smartphone is strongly warmed in the upper part of the body even in simple.
- 📉 A sharp drop in autonomy: the charge goes to 20-30% half-hour.
- 🚫 Inability to remove an unknown application through the standard menu.
- 💸 SMS messages about writing off money or subscriptions to paid services.
It's important to understand that some viruses masquerade as system processes. They may have names similar to standard Android services, but consume a disproportionate amount of power. Analysis of the charge expenditure in battery settings often helps identify such an uninvited guest, even if their icon is hidden.
Diagnostics through the built-in MIUI tools
The MIUI shell has built-in security tools that users often underestimate, and the first step is to check through the standard Security app, which scans the system for known threats and potentially unwanted programs using databases from antivirus labs.
To start the check, go to Settings → Security or find the same app with the shield icon on your desktop. Press the Security Check button and wait for the scan to end. The system will check the installed applications, system files and settings for anomalies.
☑️ Primary diagnostics plan
If the built-in scanner didn't find anything, but the symptoms persist, it's worth checking the list of installed applications manually. Go to Settings → Apps → All apps and study the list carefully. Look for programs without a name, with a transparent icon or those that you didn't install. Often viruses hide there, simulating system utilities.
⚠️ Note: If you see an application with device administrator permissions that you are unfamiliar with, immediately disable its permissions in the Settings section. → Passwords and security → Confidentiality → Special rights of access → Device administrators, without this step, it's impossible to remove it.
Use of third-party antivirus solutions
When built-in tools are scarce, specialized antiviruses come to the rescue. There are many effective solutions for the Android platform from leading cybersecurity vendors. Installing a reliable security guard is a critical step to detect complex threats that may have slipped past the system filter.
It is recommended to choose products from well-known companies such as Kaspersky, Dr.Web, ESET or Bitdefender. Avoid questionable "accelerators" and "cleaners" with questionable reviews, as they themselves may contain advertising modules.
| Antivirus | Type of scan | Impact on the battery | Free version |
|---|---|---|---|
| Dr.Web Light | Online and offline | Low. | Aye (limited) |
| Kaspersky | Real-time. | Average. | Aye (basic) |
| ESET Mobile | Scheduled. | Very low. | Got it (trial) |
| Bitdefender | Background | Minimum | Aye (basic) |
Once installed, run a full system scan. If a threat is found, follow the file removal or quarantine program guidelines. In some cases, it may be necessary to restart safe mode for effective cleaning if the virus blocks the antivirus.
What is a safe regime?
Manual removal of malicious applications
If the antivirus doesn't work, you have to manually delete it, and it requires careful attention because you need to identify the malicious file accurately. Most viruses are hidden under names like System Update, Flash Player, or they don't have a name at all, appearing as a blank spot on the list.
To remove, go to Settings → Applications → Application Management. Find a suspicious process. If the Remove button is inactive, the application has been given administrator privileges. First turn them off in the corresponding menu, as described earlier, and then return to deletion. Forced stopping before deleting can also help break the active processes of the virus.
- 🔍 Look for apps with weird names or no icons.
- 🛑 Check access rights: if the calculator requires access to contacts and SMS - it is a virus.
- 🗑️ Remove the app immediately after detection without delaying.
Sometimes a virus can be embedded in a legitimate application that you recently downloaded, and remember when you installed the software you started having problems, and try to delete it. If you can't delete the file using standard methods, you can use ADB (Android Debug Bridge) through your computer, but that requires more technical knowledge.
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Before removing system or suspicious applications, take a screenshot of the installed program list, which will help restore important components if you accidentally delete something superfluous.
Cleaning the browser and resetting network settings
Often the problem is not a separate application, but a browser hijacker, which is embedded in the browser data and forwards requests to advertising sites, in which case deleting the applications will not help, you need to clean the browser data.
Go to Settings → Applications → All apps, find your browser (Chrome, Mi Browser, etc.) and select Memory. Click Clear and select Clear All or Clear Data. This will delete the cache, cookies and saved passwords, returning the browser to its original state.
⚠️ Caution: Clearing your browser data will delete all saved passwords and browsing history.Make sure your passwords are synced with your Google account before performing this operation.
It is also recommended to reset your network settings if the virus has changed DNS or proxy servers. Go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. This action will not delete your personal files, but will return network settings to factory values, which can link to malicious servers.
Radical measures: full reset to factory settings
If none of the above methods work, the last and most effective way is a complete reset, which completely removes all data from the internal drive, including viruses, and returns the phone to the “out of the box” state. A full reset is guaranteed to remove 99.9% of all known mobile viruses, as it formats the partition with user data.
Before starting the procedure, be sure to back up important data (photos, contacts, documents) to your computer or to the cloud. After resetting, it will be impossible to restore deleted files. Make sure that the battery is at least 50-60%.
To perform a reset via the menu, go to Settings → About Phone → Settings Reset → Erase all data. The phone will request confirmation and unlock password. Once confirmed, the device will restart and begin the cleanup process, which can take 5 to 15 minutes.
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Hard Reset is the only way to guarantee the removal of deep system viruses, but it requires a mandatory data backup beforehand.
There is also a Recovery Mode reset method that is useful if the virus blocks the input to the settings menu. To do this, turn off the phone, then press the Volume Up + Power buttons at the same time. In the Recovery menu, select the language (English), then Wipe Data → Wipe All Data and confirm the action. After completion, select Reboot → Reboot to System.
Prevention of re-infection
Once a successful cleanup is done, it is important to maintain the result and prevent the threat from re-entering,-installDisable the ability to install applications from unknown sources in the settings, leaving this feature only for trusted stores.
Update your operating system and apps regularly. Xiaomi and Google are constantly releasing security patches to close vulnerabilities that hackers exploit. Ignoring updates leaves your Redmi vulnerable to attacks.
- 🚫 Do not follow links from SMS from unknown numbers.
- 📲 Install apps only from Google Play or Mi GetApps.
- 🔄 Check your phone regularly with built-in antivirus.
- 🔒 Do not use simple passwords and avoid public Wi-Fi for important transactions.
Be careful when installing new games or programs. Read carefully the permissions the app requests. If a simple flashlight game requires access to your geolocation, contacts and microphone, that's a clear sign of fraud. Vigilance is the best protection for your digital device.