Scanning an Android phone: a complete guide for users

When it comes to scanning an Android phonemany imagine anti-virus scanning or malware scanning. However, in practice, this process is much broader: from diagnosing hardware components to analyzing network traffic. In an era when smartphones store banking data, personal correspondence and access to accounts, the ability to correctly scan a device is becoming a critical skill.

In this article we will analyze all types of scanning - from virus checking to hardware testing, we will explain when and why this is necessary, and also give step-by-step guide instructions for self-diagnosis. We will pay special attention hidden threats that 90% of antiviruses from Google Play do not detectto tools available without root access. If you have ever doubted the security of your Samsung, Xiaomi or Google Pixel - this guide is for you.

What is scanning Android phone: definition and types

The scanning a smartphone understands automated or manual analysis of its software and hardware in order to identify problems. Depending on the task, the process may involve:

• 🔍 File system - searching for viruses, Trojans, spyware.
• 📱 Hardware components - testing the screen, battery, speakers, cameras.
• 🌐 Network activity —monitoring of suspicious connections and data leaks.
• 📦 System logs —analysis of errors, failures and incorrect operation of applications.

It is important to distinguish superficial scanning (for example, a quick scan with an antivirus) from deep analysis, which can take hours and require special utilities. The latter is relevant when buying a used phone, after hacking or if you suspect spyware (spyware).

Why you need to scan an Android device: 5 key reasons

Many users start scanning only when the phone is already “buggy”. In fact, regular scanning can help prevent serious problems. Here top 5 situationswhen it is needed:

1. After installing applications from third-party sources (not Google Play). Even APKs from trusted sites may contain adware (intrusive advertising) or backdoor (hidden access for hackers).
2. Before selling or buying a used phone. Checking IMEI, the condition of the battery and the absence of blocking from the operator will save nerves and money.
3. If the device behaves strangely: spontaneous reboots, rapid battery discharge, overheating without load.
4. After connecting to public Wi-Fi. Open networks are a breeding ground for MITM attacks (traffic interception).
5. To optimize performance. Scanning reveals “junk” files, cache and background processes that slow down the system.

⚠️ Attention: If the phone starts showing ads in the status bar or locks the screen asking for payment, this is a sign ransomware. Immediately turn off the Internet and run the scan in safe mode (hold the power off button → "Safe Mode").

Types of scanning: from antivirus to hardware diagnostics

Not all scans are the same. Let's look at the main types and their features:

Scan type	What it checks	Tools	Execution time
Antivirus	Viruses, Trojans, spyware, phishing links	Malwarebytes, Bitdefender, Kaspersky	5–30 minutes
Hardware	State of screen, battery, cameras, speakers, sensors	Phone Check, CPU-Z, ##4636##	10–40 minutes
Network	Suspicious connections, data leaks, DNS spoofing	NetGuard, Fing, Wireshark (for PC)	From 1 hour
System	Errors in logs, application conflicts, broken files	Logcat (via ADB), DevCheck	20–60 minutes

For a comprehensive scan a combination of tools is often required. For example, an antivirus will not detect physical damage to the battery, and a hardware test will not find keylogger (a app for stealing passwords).

How to scan an Android phone for viruses: step-by-step guide

Virus scanning is the most popular type of scan. Here action algorithm for beginners:

Turn off mobile data and Wi-Fi|Close all applications|Connect the phone to charge (scanning drains the battery)|Update the antivirus databases-->

1. Select antivirus. Suitable for basic testing: Google Play Protect (built into Google Play Market). For in-depth analysis - Bitdefender Mobile Security or Malwarebytes.
2. Run a full scan. In the antivirus settings, select the “Deep Scan” or “Full Scan” option. This will take longer, but will detect hidden threats.
3. Check the results. Please note:
   • 🚨 Trojans (for example, Android.Triada) - can replace SMS and calls.
   • 🕵️ Spies (SpyNote) - steal data from messengers.
   • 💰 Banking viruses (Anubis) - intercept payments.

Remove threats. Follow the antivirus instructions. If the virus is not removed, go to Settings → Applications, find suspicious software and uninstall manually.

⚠️ Attention: Some viruses disguise themselves as system applications (for example, com.android.system). Before deleting, check the name on Google so as not to delete a critical Android component.

If the antivirus does not find threats, but the phone behaves strangely, try checking via ADB (for experienced users):

adb shell pm list packages -f | findstr "suspicious_word"

This command will list all installed packages. Look for unfamiliar names with random letters (for example, com.xyz.abc123).

Scanning hardware components: how to check hardware

Hardware faults are often disguised as software failures. For example, fast battery discharge can be caused by both a virus and physical wear of the battery. For diagnostics, use:

• 🔋 AccuBattery - analyzes the battery condition, shows actual capacity and wear.
• 📱 Phone Check and Test - tests the screen (for dead pixels), cameras, speakers, sensors.
• 🔧 CPU-Z - displays detailed information about the processor, memory, sensors.
• 📡 Network Signal Guru —checks the connection quality and antenna.

For screen checks for dead pixels:

1. Install the application Screen Test.
2. Run a test for solid colors (red, green, blue, black).
3. Carefully inspect the screen - look for dots, stripes or uneven backlighting.

If the phone is overheats, use AIDA64 to monitor the processor temperature Normal values:

• Idle: 30–40°C.
• Under load (games, videos): up to 60–70°C.
• Critical temperature: >80°C (risk of shutdown).

What to do if the phone overheats for no reason?

1. Check background processes in Settings → Battery —the application may be to blame.

2. Remove the cover (it may block the heat sink).

3. Reset the settings to factory settings (if it gets hot after the update).

4. Contact the service - the thermal paste or battery may need to be replaced.

Network scanning: how to detect data leaks

If your phone autonomously connects to unknown servers or consumes traffic in the background, this may be a sign of spying activity. To analyze network activity:

1. Use NetGuard —the application shows which apps are accessing the Internet and blocks suspicious connections.
2. Check the DNS servers. The default should be your operator's or Google's DNS (8.8.8.8). If there are unknown IPs there, this is a sign DNS-hijacking.
3. Analyze traffic via Fing or Wireshark (on a PC). Look for connections to servers in China, Russia or other suspicious locations.

Pay attention to unusual portsto which the phone connects:

• 🚫 Port 4444 — often used for remote control (Metasploit).
• 🚫 Port 8080 — can point to a proxy server for intercepting traffic.
• 🚫 Port 5555 —standard port ADBthrough which hackers gain access to the system.

⚠️ Attention: If you find a connection to an IP address 185.143.223.43 (or similar), immediately turn off the Internet and reset your settings. This address is associated with a botnet. TrickBot.

Hidden threats: what standard scans do not find

Even the best antiviruses miss some types of threats:

• 🕵️ Spy modules in the firmwareSome budget phones (especially Chinese brands) contain. built-in backdoors for data collection. Check the firmware through F-Droid or XDA Developers.
• 📱 Fake system updatesScammers send notifications about a “critical Android update” that actually installs. virus. Never update using links from SMS!
• 🔑 Keyloggers in keyboards. Popular keyboards like Gboard or SwiftKey are usually safe, but third-party ones (for example, AI Type) can transmit entered passwords.
• 📡 Substitution of base stations (IMSI-catcher). In public places, attackers can intercept SMS and calls through false cell towers. Sign: the phone suddenly switches to 2G.

Detection of such threats requires specialized tools:

• LBE Security Master - scans application rights.
• XPrivacyLua (requires root) - blocks application access to confidential data.
• Orbot — routes traffic through Tor, protecting against wiretapping.

Frequent errors when scanning and how to avoid them

Many users make mistakes that negate all the benefits of the scan. Here's what you can't do:

• ❌ Ignore antivirus updates. Without fresh databases, it will not detect new viruses. data-i="233">or Malwarebytes or Bitdefender at least once a week.
• ❌ Scan only the system one sectionViruses often hide in folders /sdcard/ or /Download/.
• ❌ Use “cleaners” like Clean Master. Not only do they not help, but they themselves collect user data.
• ❌ Reset settings without a backupIf a virus has infected the backup copy in Google Drive. after resetting, it will return.

Also avoid suspicious ones “optimizers” v Google Play. Many of them (for example, DU Speed Booster) themselves show false threats in order to sell the “premium version”.

⚠️ Attention: If after scanning the antivirus offers to “speed up the phone” for a fee, this is a marketing gimmick. Android does not need to “overclock” or “clean the registry” (unlike Windows).

For maximum security follow this checklist:

Use 2 antiviruses (for example, Malwarebytes + Bitdefender)|Scan not only files, but also network activity|Update the OS and applications|Do not install APKs from unverified sources|Regularly check application permissions in Settings-->

FAQ: Answers to frequently asked questions about scanning Android

Is it possible to scan a phone without an antivirus?

Yes, but it is less effective. You can manually:

• Check the list of installed applications in Settings → Applications.
• Use Google Play Protect (built-in protection).
• Run diagnostics via ##4636## (hardware test).

However, without an antivirus you miss most modern threats that disguise themselves as system processes.

How often should you scan your phone?

Recommended frequency:

• 📅 Anti-virus scanning — once a week (or after installing new applications).
• 🔧 Hardware diagnostics —once a month (especially for the battery).
• 🌐 Network check —before connecting to public Wi-Fi.

Can scanning damage the phone?

No, correct scanning does not harm the device. However:

• Deep scan drains the battery.
• Some tests (for example, CPU stress test) may cause overheating.
• Removing system files manually (without root) will lead to failure.

Always monitor the phone's temperature during long checks.

What to do if the antivirus finds a virus, but cannot remove it?

Take action step by step:

1. Reboot the phone into safe mode (hold the power off button → "Safe Mode").
2. Try to remove the virus manually through Settings → Applications.
3. If that doesn’t help, run reset to factory settings (don’t forget to back up your important data).
4. For persistent viruses (for example, xHelper) it may required flashing.

Which phones are most often infected with viruses?

According to statistics Malwarebytes (2023), the leaders are:

1. Budget models Xiaomi/Redmi (due to pre-installed Chinese services).
2. Samsung with outdated firmware (especially on Android 9 and below).
3. Phones with root access (root gives access to system files).
4. Devices where updates are disabled (for example, Huawei without Google Services).

Least viruses on Google Pixel i iPhone (thanks to strict control of applications).