Xiaomi smartphone owners often face intrusive advertising or strange behavior of the system, which can signal the penetration of malware. On the popular Redmi 9 model running the MIUI shell, finding a threat requires understanding the specifics of the Android operating system.
Modern mobile threats have learned to disguise themselves as system processes, making them difficult for an inexperienced user to detect. The owner of Redmi 9 needs to carefully monitor the behavior of the interface and battery consumption. The first sign of infection is often a sharp decrease in autonomy or heating the case in downtime.
Before we start radical measures, we need to do basic diagnostics with built-in tools. MIUI It has a powerful enough arsenal for initial scanning that does not require the installation of third-party software (PUP) early stage.
Analysis of symptoms of infection of the device
Understanding exactly how the threat manifests is key to its successful elimination. On a Xiaomi Redmi 9 device, symptoms can range from barely noticeable delays to complete interface failures. It is important to distinguish software failures from hardware problems, although the line between them is sometimes blurred.
The main signs of malicious code include spontaneously opening browsers with tabs, even when you are not using the Internet, and you should also be wary if programs without icons or with name systems that you did not install appear in the list of applications.
⚠️ Note: If your phone has started sending it to you SMS to pay numbers or make calls, immediately remove SIM-Card to avoid financial losses.
Another alarming sign is the unexplained growth of traffic consumption: malware like Trojans or miners are constantly exchanging data with remote servers, and this can be checked in mobile data usage statistics, where a suspicious application will occupy a leading position.
- 📉 Sharp drop in performance and constant getting stuck of the launcher interface.
- 🔋 Fast battery discharge, especially in the background without active operation.
- 📲 Appearance of pop-ups on the desktop or on top of other applications.
- 🚫 Blocking the ability to install security updates or antivirus software.
Use of the built-in MIUI security scanner
The first step in combating threats on Xiaomi Redmi 9 should be the use of the native tool “Security”.This pre-installed application is optimized specifically for working with the MIUI shell and has access to deep layers of the system, inaccessible to third-party scanners.
Launch the Security app (green zipper icon) and press Security Check button. The system automatically scans the installed applications, checks for known virus signatures, and analyzes current privacy settings.
It is important to note that the antivirus engine in MIUI is periodically updated through Google Play services, but for maximum efficiency it is better to manually run database updates. If the built-in scanner found nothing, but the symptoms persist, the problem may lie in aggressive advertising or hidden permissions.
Once the scan is complete, the system will address the risks found. The built-in MIUI scanner effectively detects known high-risk Trojans and applications, but can skip complex spyware modules.
- 🛡️ Regular update of antivirus databases through the GetApps app store or Google Play.
- ⚙️ The ability to set the schedule of automatic checks at night.
- 🔍 Deep inspection APK-files before installing them from unknown sources.
Manual verification of installed applications and permissions
If the automatic tools fail, you need to manually audit the installed programs. On Redmi 9, many threats are disguised as system services or have no name. Go to Settings menu → Applications → All applications for detailed analysis.
Check the list carefully for strange entries, often hidden under names like System Service, Update, or Flash Player, but with or without a low-quality icon, removing such objects is a priority for restoring security.
You should pay special attention to permissions. Go to Privacy Protection → Permission Manager. Check which apps have access to SMS, make calls, or overlay other windows. Excess rights in simple games or calculators are a sure sign of danger.
☑️ Checking suspicious applications
Special features are a feature that often prescribes clicker viruses that mimic user actions, and if you see an unfamiliar app there, immediately disable it and delete it.
| Type of permit | Security risk | Action. |
|---|---|---|
| Overlay over other windows | High (phishing, clicking) | Disable all suspicious apps |
| Access to SMS | Critical (theft of bank codes) | Leave it only for messengers |
| Device administrator | Critical (deletion blockage) | Remove rights before deletion |
| Using data in the background | Medium (traffic, battery) | Limit or prohibit |
Verification through Google Play Protection and Third-Party Antiviruses
To improve security on Xiaomi Redmi 9, it is advisable to use cloud protection technologies from Google. Play Protect works at the system level and scans applications even before they are installed, as well as conducts periodic checks of already installed software.
To activate deep validation, open the Google Play Store app, click on your profile avatar, and select Play Protection. Click Check. This method is effective against the most common threats, as it uses the world's largest signature database.
However, if the threat is complex, embedded tools may not be enough, in which case it is recommended to install a specialized antivirus from a well-known vendor, such as Kaspersky, Dr.Web or Malwarebytes, which are able to find hidden miners and advertising modules that are ignored by standard scanners.
Should I install several antiviruses?
When using a third-party antivirus, it is important to give it the necessary permissions to scan the file system. Once the database is checked and cleaned, the antivirus can be removed so that Redmi 9 resources are not spent in the background.
Analysis of device administrator rights and hidden processes
One of the most insidious virus writers’ techniques is to obtain device administrator privileges. In this case, the user cannot simply remove the malicious application, since the Delete button will be inactive. On MIUI, this section is located along the Settings path → Passwords and Security → Privacy → Special Access Rights → Device Administrator Applications.
The list that opens should only include system services like Find a Device or enterprise clients if the phone is working. If you see an unknown application with administrator rights, it's almost guaranteed to be a virus, and the first step is to uncheck it, and then proceed to uninstall it.
It's also worth checking the list of processes that are running at the moment. Although Android restricts access to this for ordinary users, you can use the developer menu or third-party task managers. Look for processes with names that are similar to the system, but with typos or strange prefixes.
⚠️ Warning: Some viruses disguise themselves as empty spaces in the list of applications. If you see an “empty” line in the list of installed programs that cannot be highlighted with a standard click, try clicking on it several times quickly or use the file manager to find it. APK-file.
For advanced users, you can use USB debugging and adb commands to view the full list of packages. The adb shell pm list packages will display all installed packages where you can detect anomalies by the name of the packages that do not match the legitimate software.
- 🔓 Removal of Administrator Rights is a Mandatory Step Before Removing Persistent Viruses.
- 👁️ Visually search for “empty” lines in the app menu.
- 📦 Verification of application signatures for compliance with the developer.
Radical measures: Resetting and safe regime
If you can’t remove the threat using standard methods, the only reliable way is to switch to Safe Mode. In this mode, Redmi 9 loads only with system applications, which allows you to safely remove the virus that normally blocks user actions.
To enter Safe Mode on most MIUI devices, you need to press the shutdown button and then hold the "Stop" or "Reboot" option on the screen for a long time until you get a suggestion to go to Safe Mode. An alternative method is to press the volume button when you turn on the phone (depending on the firmware version).
While in Safe Mode, remove any suspicious apps and clear the browser cache. Once rebooted in normal mode, the system should work normally. If the problem is not solved, the last argument remains - a complete reset to factory settings.
💡
A full Hard Reset removes 100% of viruses, but also erases all personal data, so backup is critical.
Before resetting, make sure you save important contacts and photos. Reset is done through the Settings menu → About Phone → Reset → Erase all data. This will return the Xiaomi Redmi 9 to the “out of the box” state, guaranteed to remove any software infection.