A sudden decrease in performance, rapid battery drain, or the appearance of intrusive advertising may indicate that your smartphone is infected with malware. The operating system Android, due to its openness, has become the main target for cybercriminals who create Trojans, spyware and miners. Users often ignore the first alarm bells until the problem becomes critical for the safety of personal data.
Checking a device for viruses requires an integrated approach, including analysis of installed applications, monitoring network activity and the use of specialized software. In this article, we will look in detail at how to identify hidden threats, clean the system and prevent re-infection without losing important information.
Main signs of infection of a mobile device
The first step in diagnosis is to carefully monitor the behavior of the gadget. Malicious apps rarely work without a trace, leaving characteristic traces in the operation of the system. If you notice that your smartphone has started to slow down even on simple tasks, you should be wary.
One of the most obvious indicators is abnormal energy consumption. Viruses-miners or spyware modules constantly work in the background, loading the processor. This leads to the fact that the battery discharges much faster than usual, and the device body can become noticeably warm even at rest.
Pay attention to pop-up windows. If advertising appears on top of other applications or on the desktop when the browser is closed, this is a sure sign of presence Adware. Also, an alarming signal is the appearance of unknown icons in the application menu or automatic subscription to paid services, about which you receive SMS notifications from the operator.
- 📉 A sharp drop in the speed of the interface and a long launch of apps.
- 🔋 Rapid battery discharge and overheating of the case without an active load.
- 📢 Intrusive advertising and pop-up banners in unexpected places.
- 📡 Unexpected increase in mobile traffic consumption in operator statistics.
⚠️ Attention: If you see notifications about your phone being blocked or requests to transfer money to unlock it, do not pay under any circumstances accounts. This is a fraudulent scheme, and payment will not restore access to the device.
Checking with built-in Google Play Protect
Before installing third-party software, use the built-in protection system from Google. The service Play Protect automatically scans applications in the store Google Play and apps already installed on the device for malicious code. This is a basic level of protection that should be active on any modern smartphone.
To run a manual scan, you need to go to the application store. Enter the name of the service in the search bar or find it in the account settings menu. The system will analyze all installed packages and compare their signatures with the database of known threats.
If the system detects suspicious activity, it will offer to remove the dangerous application. However, it is worth remembering that the built-in scanner does not always cope with new or complex threats, so it should be considered as the first stage of diagnosis, and not a panacea.
Settings → Security → Scan deviceMake sure that the "Improve detection of malicious applications" function is enabled in the Play Protect settings for a more in-depth analysis.
ℹ️ The security menu interface may differ depending on the smartphone model and the manufacturer’s shell version (MIUI, OneUI, ColorOS). If you do not find the specified path, use the search in the settings.
Using specialized antiviruses
For a deeper scan, it is advisable to use professional solutions from well-known vendors. Market leaders, such as Kaspersky, Dr.Web or ESEToffer powerful engines that can detect complex Trojans and rootkits that standard tools miss.
When choosing an antivirus, pay attention to the functionality of the free version. Often a basic scanner is enough for a one-time scan and removal of the threat. Do not install several antivirus apps at the same time - this may cause process conflicts and slow down the phone even more.
After installation, run a full system scan. The process may take from 5 to 15 minutes depending on the number of files and the speed of the drive. Upon completion, carefully study the report: if threats are found, follow the app’s recommendations for neutralizing them.
| Antivirus | License type | Key feature | Impact on the battery |
|---|---|---|---|
| Kaspersky Internet Security | Freemium | Anti-theft and call protection | Average |
| Dr.Web Light | Free | Effective treatment module | Low |
| ESET Mobile Security | Trial version | Phishing protection | Low |
| Bitdefender Antivirus | Free | Minimalistic interface | Minimal |
Specialized antiviruses have more up-to-date databases signatures than built-in tools, which is critical for detecting fresh malware.
Manual analysis of installed applications and access rights
Many viruses disguise themselves as useful utilities: flashlights, QR code scanners or memory cleaners. Carefully review the list of all installed apps. Remove any applications that you don't remember installing or that have suspicious names.
Pay special attention to access rights. Go to your privacy settings and check what permissions are given to each app. A warning sign is if you are asked for rights to read SMS, access contacts, or be able to overlay other windows for a simple calculator or game.
Check the list of device administrators. Malware often gains administrator rights to prevent itself from being removed. If you see an unknown application in this list, immediately revoke its rights through the menu Settings → Security → Device Administratorsand then delete it.
- 🔍 Look for applications without an icon or with a name consisting of a set of characters.
- 🚫 Revoke "Call Control" rights from applications not associated with your phone.
- 👁️ Check permissions for "Access to Accessibility" - this is a common attack vector.
Removing non-removable viruses through safe mode
If normal removal is impossible, since the "Delete" button is inactive or the application is restored immediately, you need to boot into safe mode. In this mode, only system applications are launched, which allows you to remove malicious software that is usually hidden or blocks user actions.
To enter safe mode on most smartphones, you need to hold down the power button, and then hold down the “Shut down” or “Reboot” option on the screen for a long time until you are prompted to boot into safe mode. On some models Samsung or Xiaomi the procedure may differ.
While in safe mode, go to application settings and remove suspicious software. After cleaning, reboot your phone as usual. If the problem disappears, then the threat has been eliminated.
How to enter safe mode on different models?
On devices with pure Android, hold down the power button, press and hold the "Power off" icon on the screen. On Samsung smartphones, turn off the phone, then turn it on and immediately hold down the volume down button until the logo appears.
⚠️ Attention: In safe mode, third-party widgets and some functions may not work. This is normal, do not try to repair the phone in this state, your goal is only to remove viruses.
Radical measures: reset to factory settings
If none of the methods helped and the phone continues to behave inappropriately, the last resort remains - a complete data reset (Hard Reset). This procedure will return the device to its original state, deleting absolutely all data, including viruses, photos and contacts.
Before performing a reset, it is critical to save a backup copy of important data to a cloud drive or computer. Make sure that you copy only files (photos, documents), but not the applications themselves, so as not to restore the infected file back.
You can perform a reset through the settings menu in the "Recovery and reset" section or through the Recovery menu using the physical volume and power buttons. After the process is completed, the phone will need to be set up again as new.
☑️ Preparing to reset the settings
A full factory reset guarantees the removal of 99% of types of malware, but requires careful preparation to save personal data.
Prevention and protection against future threats
After cleaning the device, it is important to change your usage habits to avoid re-infection. The main rule is to avoid installing applications from dubious sources. Download apps only from the official store Google Play or proven alternatives.
Regularly update the operating system and installed applications. Developers are constantly closing security vulnerabilities that hackers exploit. Ignoring updates leaves your phone open to attack.
Be careful of phishing links. Do not follow links from suspicious SMS or instant messenger messages, even if they are sent by friends - their accounts could have been hacked. Installing a reliable antivirus with a web protection function will become an additional barrier to threats.
Frequently asked questions
Can a virus on Android steal money from a bank card?
Yes, it is possible. Banking Trojans can intercept SMS messages containing verification codes or overlay fake data entry windows on top of real banking applications. Always check which application you are entering the details in.
Do you need to buy a paid antivirus for your phone?
For most users, free versions of reputable antiviruses or built-in Google Play Protect are sufficient. Paid versions are needed if you store critical commercial data on your phone or frequently visit risky sites.
How can you tell if your phone is being tapped?
Signs of spyware may include strange sounds during calls, rapid discharge, heating in standby mode, and strange behavior of the network indicator. However, these symptoms may also indicate technical problems.
Does resetting the settings remove viruses from the memory card?
No, resetting the phone only clears the internal memory of the device. If the virus is on an SD card, it must be removed separately by scanning the card through a computer or a file manager with an antivirus.