Modern smartphones have computing power sufficient to solve cryptographic problems, which is what attackers take advantage of. Users often look for ways install a miner for passive income, but most often they are faced with a situation where malware enters the system unnoticed. Such a app consumes the resources of the processor and video accelerator, causing overheating and rapid battery discharge, while the profit is made by the owner of the virus, not you.
Detecting a hidden one cryptojacking can be difficult, since malware developers disguise them as system processes or harmless utilities. In this article, we will analyze in detail the algorithms for searching for illegal miners, methods for analyzing them, and methods for completely cleaning the device. You will learn what signs indicate virus activity and how to protect your Android from re-infection in the future.
Direct signs of malware activity
The first and most obvious symptom of the presence of a miner is the abnormal behavior of the smartphone hardware. Even in idle mode, when the screen is off and there are no applications running, the device may feel hot to the touch. This happens because hash calculations creates an extreme load on the processor cores, forcing them to operate at maximum frequencies.
Pay attention to the battery drain rate. If your phone previously held a charge for a day and a half, but now requires recharging every 4-5 hours with minimal use, this is an alarming sign. Malicious scripts run in the background constantly, consuming energy even when you are not using the gadget.
⚠️ Attention: Constant overheating of the smartphone case above 45 degrees Celsius can lead to irreversible degradation of the battery and peeling of the display due to expansion of the glue.
It is also worth listening to the work devices. Ventilation holes (if any) may make noise, and the case itself may vibrate due to the intense operation of components. Sometimes users notice that the phone begins to “slow down” when performing simple tasks such as typing or opening contacts, since all resources are thrown into mining.
Use a real-time temperature monitoring application to record heat spikes when the phone is idle.
Analysis of battery and processor usage statistics
The most reliable software way to find a miner is a deep analysis of system statistics. The operating system Android keeps detailed records of energy consumption by each running process. Attackers often disguise their applications as system services with similar names, for example System Update or Google Service Framework, but with spelling errors.
To check this information, you need to go to the device settings. Navigation may vary depending on the manufacturer's shell, but the general path usually looks like this: Settings → Battery → Battery Usage. In this menu, you will see a list of applications sorted by energy consumption.
Look for processes that rank unreasonably high in the list. If you see an application with the name Wi-Fi Tool or Flash Playerthat you did not install, and it consumes 30-40% of the charge, it is almost guaranteed to be a miner. Legitimate system processes rarely consume more than 10-15% of total energy.
- 🔍 Check applications running in the background for more than 1 hour without screen activity.
- 🔋 Pay attention to processes with a high percentage of CPU usage in standby mode.
- 📱 Compare the names of suspicious services with official list of system processes for your model.
If the statistics indicate “Android System” or “Media Server” with abnormally high consumption, this may indicate that a virus has entered the system partition and is masquerading as a legitimate component. In this case, simply deleting the application will not be enough.
Identifying hidden applications in the list of installed apps
Many miners try to hide their presence in the general list of installed apps. They may not have an icon on the desktop or in the application menu, but still remain active in the system. To find such hidden entities, you need to use the advanced settings of the application manager.
Go to the Settings → Applications → All applicationssection. Scroll to the very end of the list. Often malware is hidden at the very bottom of the list or, conversely, at the very top, simulating a system service. Look for applications without an icon (empty white square) or with a transparent icon.
Another method is to use developer mode or special utilities. Some miners block access to their settings, so the “Delete” button may be inactive (grayed out). In this case, you must first revoke device administrator rights from the suspicious application.
| Symptom | Legitimate application | Miner virus |
|---|---|---|
| Icon in the menu | Present, clear | Absent or transparent |
| RAM consumption | Low in the background | High, constant |
| Resolutions | Functions correspond | Request for excess rights (file access) |
| Application size | Stable | Can grow over time (module loading) |
It is also worth checking the section "Special access" in settings. Miners often request the right to display on top of other windows or access to Accessibility (Accessibility) in order to intercept control and prevent their removal.
How to find an application without an icon via ADB?
If you cannot visually find the virus, you can connect your phone to the PC and enter the command adb shell pm list packages. This will display a list of all packages, including hidden ones, from which you can identify unnecessary software.
Using anti-virus scanners and specialized utilities
Manual search is effective, but does not always detect complex threats that use polymorphic code. For in-depth diagnostics, it is recommended to use specialized antivirus solutions. Standard Google Play Protect often misses new versions of miners, so it is better to install a third-party scanner.
It is recommended to use tools such as Malwarebytes, Kaspersky Internet Security or Dr.Web. These applications have signature databases that are updated in real time and are able to find known families of miners, such as Loapi or XmrMiner.
When running a full scan, make sure that the phone is connected to a Wi-Fi network, as the signature database can be large. If your antivirus finds a threat, follow its quarantine or removal instructions. In some cases, you may need to reboot into safe mode for successful cleaning.
⚠️ Attention: Do not install several antiviruses at the same time. This will create a resource conflict, slow down the phone and may trigger false alarms against each other.
In addition to classic antiviruses, there are utilities for network monitoring, for example, NetGuard. They allow you to see which applications are trying to connect to external servers. The miner needs to send data about the found hashes to the pool, so suspicious outgoing traffic from an unknown process is a sure sign of infection.
☑️ Actions when a virus is detected
Cleaning through safe mode and resetting settings
If the virus has administrator rights or has penetrated the system so deeply that it cannot be removed in normal mode, you must use Safe Mode. In this mode, only system applications are launched, which blocks the activity of malware and allows you to remove it.
To enter safe mode, you usually need to hold down the power button on the screen, and then press and hold the “Power off” (or “Restart”) item until the corresponding request appears. After rebooting, “Safe Mode” will appear in the corner of the screen. Now you can go to the application settings and remove suspicious software.
In extreme cases, when removal is impossible or the system continues to be unstable, the only option is a full reset to factory settings (Factory Reset). This procedure will remove all data from the internal memory, including viruses, but will return the phone to its original state.
Settings → System → Reset settings → Erase all data (factory reset)Before performing a reset, it is critical to save contacts, photos and documents to a cloud drive or computer. Remember that after the reset, all installed applications will be deleted, and you will have to configure the phone again.
Resetting to factory settings is the only 100% guaranteed way to remove complex system miners that block the removal of applications.
Infection prevention and rules of digital hygiene
So as not to look for ways to remove them in the future miner, you must follow safety rules when using a smartphone. The main attack vector is the installation of applications from untrusted sources. Never download hacked games, mods or “premium” versions of apps from dubious forums.
Carefully read the permissions that the application requests during installation. If a simple flashlight or calculator asks for access to your contacts, microphone, or the right to install other applications, this is a clear signal of danger. Cancel the installation of such software immediately.
- 🚫 Prohibit the installation of applications from unknown sources in the security settings.
- 🛡️ Regularly update the Android operating system and security patches.
- 📉 Avoid clicking on advertising banners on sites with pirated content.
It is also worth periodically checking the list of applications with administrator rights. Go to Settings → Security → Device Administrators and make sure there is nothing unnecessary there. Only services like “Find Device” or corporate profiles should have such rights.
⚠️ Attention: Settings interfaces may differ depending on the Android version and shell (MIUI, OneUI, ColorOS). If you do not find the specified item, use the search in the settings.
Frequently asked questions (FAQ)
Can a miner steal my passwords and card data?
The classic miner itself is aimed only at computing power. However, mining viruses are often delivered as part of Trojan complexes, which may include keyloggers or data stealers. Therefore, if a miner is detected, you should change all important passwords after cleaning the phone.
Why does the antivirus not see the miner, although the phone is heating up?
Virus developers constantly update the code, using obfuscation and polymorphism techniques to change the file signature. Anti-virus databases may not be able to keep up with new threats. In such cases, only manual analysis of battery statistics and network activity helps.
Is it dangerous to mine cryptocurrency on a phone legally?
Yes, it is dangerous for the device itself. Smartphones do not have an active cooling system comparable to PCs. A prolonged load of 100% will lead to swelling of the battery, degradation of the screen and failure of the processor. The economic benefit will be meager.
How to remove a miner if it does not allow you to enter the settings?
Try to boot into safe mode (holding the volume down button when turning it on). If this does not help, you will need to enter Recovery mode and perform a complete data reset (Wipe Data/Factory Reset), which will delete all information from the phone.