Detecting malicious software on a smartphone is a task that requires a careful approach, since modern threats are often disguised as legitimate applications. Many users notice that something is wrong only when the device begins to work incorrectly, discharges quickly, or displays intrusive advertising. However, you should not rely solely on intuition, because some types of Trojans and spyware can operate hidden in the background without causing obvious disruptions in the interface.
There are several methods diagnostics: from built-in system tools to specialized software that can identify deeply integrated threats. In this article, we will look at how to spot viruses on an Android phone, using both standard Google security features and third-party solutions. It is important to understand that timely scanning of files and installed packages can save your personal data from theft or encryption.
Primary signs of infection: what to look for
Before running a scan, it is worth analyzing the behavior of the gadget. Often malware gives itself indirect signs that are easily confused with system failures or battery wear. If you notice a sharp drop in performance when simple applications take longer to load than usual, this is a cause for concern. A particularly alarming signal is the situation when the smartphone heats up at rest, without active user actions.
Pop-up advertising windows appearing on the desktop or on top of other applications are a classic symptom adware. Such apps often penetrate the system along with free utilities from unverified sources. It is also worth checking the list of installed apps: if you see applications with icons without names or those that you cannot remove in the standard way, this is most likely the work of malware.
⚠️ Attention: If banners appear on the lock screen demanding to unlock the device for money, do not transfer funds under any circumstances. This is fraud, and payment will not restore access to the system.
Abnormal traffic consumption is another important indicator. Go to Settings and look at your mobile data or Wi-Fi usage statistics. If some unknown application is consuming gigabytes of traffic in the background, it may be transferring your data to third-party servers. In this case, network activity becomes the main marker of the problem.
Using the built-in Google Play Protection scanner
The most accessible and safest method of initial scanning is using a standard antivirus from Google, which is integrated into the application store. This tool automatically scans all downloaded files, but also allows you to run a manual scan of your entire system. The function Play Protect works at the kernel level and is capable of detecting most known threats without installing additional software.
To start the procedure, you need to open the application Play Market on your device. In the upper left corner, click on the profile icon, then select Play Protectionfrom the drop-down menu. The window that opens will display the security status of your phone. If you see the message “Applications scanned: no threats detected,” it means that there are currently no known viruses in the Google database.
However, to be completely sure, you should initiate a forced scan. Click the button Check next to "Scan applications." The process can take from several minutes to half an hour, depending on the amount of installed software. At this time, the system checks the hash sums of the files against the threat database.
Enable the "Improve detection of malicious applications" option in the Play Protection settings to send data about installed applications to Google for more accurate analysis.
If protection detects a suspicious element, she will offer to delete it immediately. Agree with the system's recommendation, as ignoring the warning may escalate the problem. It is worth noting that the database is updated automatically, so it is important to have an active Internet connection during the scan.
Scanning through third-party antivirus utilities
When built-in tools are not enough or a more in-depth analysis of the file system is required, specialized applications from leading security vendors come to the rescue. apps like Kaspersky, Dr.Web or ESET have expanded signature databases and heuristic algorithms capable of finding new, previously unknown threats.
Installing such software requires caution: download the antivirus only from the official store Google Play, avoiding third-party sites and APK files. After installation, grant the application the necessary permissions to access files and system settings, otherwise the scan will be superficial. Run a full system scan that will check not only installed applications, but also the cache and downloaded files.
- 🔍 Deep scan: scans all memory sectors, including hidden folders where rootkits are often hidden.
- 🛡️ Real-time protection: monitors application activity and blocks unauthorized attempts access.
- 🧹 Junk cleaning: many antiviruses simultaneously delete temporary files that may contain traces of malicious code.
Some advanced utilities offer a function for checking access rights. If an application requests permissions that do not correspond to its functions (for example, a flashlight asks for access to contacts), the antivirus will mark it as suspicious. This helps to identify spywarewhich would otherwise go unnoticed.
⚠️ Attention: Never install two active antiviruses at the same time. They can conflict with each other, causing system slowdown and false positives.
Diagnostics through Safe Mode
If the phone behaves strangely, but antiviruses do not find anything, the virus may be running with administrator rights or masquerading as a system process. In this case, the diagnostic method is to load into Safe Mode (Safe Mode). In this state, only system applications are launched, and all third-party software, including potential viruses, is blocked.
To enter this mode, you usually need to hold down the power button, and then hold down the “Power off” or “Turn off” option on the screen for a long time until you are prompted to reboot into safe mode. On different models Samsung, Xiaomi or Pixel the combination of buttons may differ, so it is worth checking the instructions for a specific model. If the phone works stably in safe mode and the advertising has disappeared, then the problem is definitely in one of the installed applications.
While in safe mode, go to Settings → Applications. Study the list carefully. A virus application that would normally hide its icon or delete button will now become visible and available for uninstallation. Remove any suspicious apps that you did not install yourself or that have strange names.
adb shell pm list packages -fFor advanced users with access to USB debugging, you can use the ADB command to display a complete list of packages. This allows you to see even those applications that are hidden from the standard settings interface. If you find a package with a name similar to the system one, but installed recently, this is a reason to check it.
How to exit safe mode?
Simply reboot the device in the usual way. When turned on, the phone will automatically return to standard mode with all applications.
Analysis of applications with administrator rights
One of the most serious threats are apps that have received rights device administrator. Such applications cannot be removed in the usual way, since the system blocks this operation to protect critical settings. This is often how ransomware viruses work by blocking the screen.
You can check the list of such privileged apps in the security settings section. The path usually looks like Settings → Security → Device Administrators (or Settings → Biometrics and Security → Other security settings → Device administrator applications). This list should contain only trusted services, for example, "Find My Device" from Google or corporate email clients.
| Application name | Status | Action |
|---|---|---|
| Find my device | Active (System) | Leave |
| Flashlight LED | Active (Suspicious) | Disable and delete |
| Clean Master Pro | Active | Check necessity |
| Unknown System Service | Active (Critical) | Disable urgently |
If you see an unknown application in the list, especially with administrator rights, immediately uncheck the box next to it. After this, it will lose privileges and become a regular application that can be deleted through the standard menu. Without this step, virus removal is often impossible.
Administrator rights give the application full control over the device, including the ability to lock the screen and prevent deletion. Always check this list.
Manual check through Application Manager
Sometimes malicious code is embedded in legitimate applications or disguised as system services with a changed name. Manual analysis of the list of installed apps allows you to identify anomalies that automatic scanners miss. Pay attention to applications without icons or with icons in the form of a standard Android robot.
Go to Settings → Applications → All applications. Scroll to the end of the list. Look for apps with a blank name or a name consisting of a string of characters. Applications that have a huge amount of data in the “Size” column that is incomparable with their function are also suspicious (for example, a simple calculator takes up 500 MB).
- 📱 Checking the installation date: sort applications by installation date. If the virus appeared recently, it will be at the beginning or end of the list, depending on the sorting.
- 👁️ Visual inspection: look for duplicate system applications (two browsers, two stores, etc.).
- 🚫 Analyzing permissions: go to each suspicious one application and see what rights it requests.
Pay special attention to applications that can draw on top of other windows. This feature is often used to create fake bank login windows or display advertisements. Disable this permission for all unverified apps in the Special section. capabilities or On top of other applications.
⚠️ Attention: The Android settings interface may differ depending on the OS version and the manufacturer's shell (MIUI, OneUI, ColorOS). If you do not find the specified item, use the search inside the settings menu.
Dramatic measures: reset to factory settings
If none of the methods helped get rid of the virus, or if the device is so locked that it is impossible to even enter the settings, the last and most radical method remains - a complete data reset (Hard Reset). This procedure completely clears the internal memory of the phone, returning it to its out-of-the-box state, which is guaranteed to remove any software, including viruses.
Before performing a reset, it is critical to save all valuable data: photos, contacts and documents. The virus can damage files, so copy them to your computer or cloud storage. However, do not restore the application backup immediately after the reset, as you may get the virus back along with the backup. Restore only personal files.
To perform a reset via the menu: go to Settings → System → Reset settings → Delete all data (factory reset). Confirm the action and enter the unlock password. The device will reboot and begin the cleaning process, which may take several minutes.
☑️ Preparing to reset the device
If the menu is unavailable due to a virus, you can use Recovery mode. Turn off the phone, then hold down the combination of buttons (usually Volume Up + Power). In the menu that appears, use the volume buttons to select Wipe data/factory reset and confirm with the power button. After completion, select Reboot system now.
FAQ: Frequently Asked Questions
Can a virus on Android be infected through SMS?
SMS messages themselves do not contain executable code, so just reading the text is safe. However, the virus may come in the form of a link in a message. Clicking on such a link may lead to a phishing site or initiate the download of a malicious APK file. Never click on suspicious links from unknown numbers.
Do you need an antivirus on Android in 2026?
For an ordinary user who downloads applications only from Google Play and does not visit suspicious sites, the built-in protection of Play Protect is usually sufficient. An antivirus is necessary if you often install apps from third-party sources (APK), visit risky sites, or store confidential data on your phone.
What to do if, after removing the virus, the phone still slows down?
The virus may have damaged system files or left behind garbage in the registry. Try clearing the cache of all applications through settings. If the problem persists, the only reliable solution is a full reset to factory settings, which is guaranteed to eliminate any software errors.
How to distinguish a virus from a regular system crash?
System crashes are usually random and do not have a clear pattern. Viruses manifest themselves systematically: constant advertising, rapid discharge, heating at rest, strange lists in the call log or outgoing SMS. The presence of several such signs at the same time is highly likely to indicate infection.