Many users don't even suspect that their home network can be taken over by hackers. Wi-Fi router Often becomes an invisible victim of attacks, remaining undetected by its owner. While you're quietly watching movies or working, your device could be sending spam or mining cryptocurrency.
The symptoms of an infection aren't always obvious: your internet might simply be slower than usual. However, ignoring these signs can be dangerous, as all connected devices are at risk. In this article, we'll discuss how to diagnose the problem and restore your network's security.
Modern routers are full-fledged computers with their own operating system. Linux-based Firmware is vulnerable to the same exploits as desktop OSes. Therefore, the question of how to check a router for viruses is critical for every smart home owner.
Signs of a router infection
The first warning sign is often a sudden drop in internet speed. If your provider guarantees a stable connection, but you're constantly experiencing video buffering, you should be wary. A virus could be using your connection to transfer large amounts of data in the background.
Pay attention to the activity indicators on the device body. If the data transfer light WAN or Internet Flashing at a crazy speed when you are not downloading anything is a bad sign. Traffic may leak due to botnet or miner activity.
⚠️ Note: If your antivirus software constantly blocks connection attempts to unknown IP addresses, the source of the problem may lie in your network equipment, not your PC.
Another symptom is the inability to access the router's admin panel or the password being changed without your intervention. Attackers often change login credentials to consolidate their presence in the system. You may also experience spontaneous redirects to advertising sites when attempting to open any portal.
Diagnostics using antivirus software
The first step to detecting a threat is using specialized software. Standard PC antiviruses often don't scan network equipment in depth, but they can detect network activity. You'll need utilities that can analyze network connections and open ports.
Many modern cybersecurity solutions have modules for checking routers. For example, products from Kaspersky or Bitdefender can scan the network for vulnerabilities. They check to see if dangerous ports are open, such as Telnet or SSH, for the outside world.
- 🔍 Run a full network scan in your antivirus package.
- 🔍 Check the list of connected devices for unknown gadgets.
- 🔍 Use online scanners such as F-Secure Router Checker.
It's important to understand that your computer's antivirus software only sees external manifestations. If a virus has penetrated the firmware (firmware), it can mask its activity. Therefore, software testing is only an initial diagnostic step, requiring further confirmation.
Manually check settings and logs
The most reliable way to find out the truth is to look "under the hood" of the device. You need to log in to the administrator's web interface. To do this, enter the gateway IP address (often 192.168.0.1 or 192.168.1.1) in the browser's address bar. You'll need to enter your username and password.
First of all, check the system logs section (System Log or Event Log). There may be records of failed login attempts or, conversely, successful authorizations from an unfamiliar IP. If you see hundreds of records per minute, this is a sign DDoS attacks or the work of a brute-force script.
Check your DNS settings. This is a critical parameter. If your DNS server addresses are changed to IP addresses you don't recognize (not your ISP's or public ones like Google 8.8.8.8), you're being redirected to phishing sites. This phenomenon is called DNS hijacking.
| Parameter | Normal condition | Sign of infection |
|---|---|---|
| DNS Server | Automatically or from the provider | Unknown IP addresses |
| Remote Management | Disabled | Enabled |
| UPnP | Limited or disabled | Active for all devices |
| Password Admin | Complex, modified | Standard (admin/admin) |
⚠️ Note: Router interfaces from different manufacturers (Asus, TP-Link, Keenetic) may differ. Menu item names may vary, but the settings themselves remain the same.
Analyzing the list of connected clients
Go to the section responsible for the wireless network or client status (Wireless Status, Client List, DHCP Client List). This displays all devices currently accessing the internet through your router. Carefully review the list of MAC addresses.
Compare each device to your own gadgets. TVs, smartphones, laptops, smart light bulbs—they should all be familiar to you. If you see a device with the name Unknown or a strange MAC address that you don't recognize, this is cause for concern. Someone may have hacked your Wi-Fi key.
To accurately identify your devices, you can temporarily disconnect them from the network and see which ones disappear from the list. If an "extra" client remains, it means someone else has access. In this case, you should immediately change your Wi-Fi password and encryption type. WPA2-PSK or WPA3.
☑️ Checking connected devices
Virus removal and cleaning methods
If the threat is confirmed, the most effective treatment is a complete reset of the settings (Hard Reset). There is a small hole with the inscription on the router body. ResetPress it with a paperclip for 10-15 seconds until the lights flash. This will reset the device to its factory settings, removing any viruses from the active memory.
However, if a virus has penetrated the firmware recovery section, a simple reset may not be enough. In this case, a reflash is necessary. Download the latest firmware version only from the manufacturer's official website. Via the web interface in the section Administration or System Tools Select the firmware file and start the update.
Update process:1. Download the .bin or .trx file from the official website.
2. Log into the router (192.168.0.1).
3. Find the "Software Update" section.
4. Upload the file and click "Start".
5. Wait for the reboot (do not turn off the power!).
After reinstalling the system, be sure to change the password for accessing the admin panel. Standard passwords are admin/1234 Known to all hackers and bots. Create a unique combination of characters that is difficult to guess.
What to do if the router does not update?
If the standard update procedure fails or is interrupted, you may need to use Recovery Mode. This typically involves holding down the Reset button while turning on the device and using a dedicated TFTP client to upload the firmware. The instructions vary for each model.
Prevention of re-infection
After cleaning, it's important to secure the results. Enable automatic firmware updates if supported by your model (Auto Update). This ensures that security holes are closed immediately after the manufacturer releases patches.
Disable remote control (Remote Management), unless you specifically use it. This feature allows you to manage your router from anywhere in the world, but it often becomes an entry point for hackers. It's also worth disabling the protocol. WPS, as it has known vulnerabilities.
- 🛡️ Change your administrator and Wi-Fi network passwords regularly.
- 🛡️ Disable unnecessary services (UPnP, Telnet, SSH) externally.
- 🛡️ Use a guest network for guest devices and IoT gadgets.
⚠️ Please note: Manufacturers are discontinuing support for older router models. If your device is more than 5-7 years old and no firmware updates are available, no settings can guarantee security. In this case, the only solution is to replace the equipment with modern equipment.
Frequently Asked Questions (FAQ)
Can an antivirus program on a computer remove a virus from a router?
No, antivirus software on a PC runs on the computer's operating system. It can block access to a malicious website redirected by the router, but it can't modify files inside the router. A reset or reflash of the router itself is required.
How do I know if my Wi-Fi has been hacked?
The main symptom is the appearance of unfamiliar devices in the DHCP client list. Other signs may include the network activity indicator blinking when you're not doing anything, or the inability to access the router settings with your usual password.
Is a router virus dangerous for banking data?
Yes, it's extremely dangerous. Through DNS spoofing, attackers can redirect you to a fake bank website. You'll think you're entering your data on the real resource, but your information will actually end up in the hands of hackers. Therefore, checking your DNS settings is essential.
Will the virus reset the settings after a Hard Reset?
A typical virus residing in RAM will be removed. However, there are complex threats (such as rootkits) that can install themselves in protected memory areas. In such cases, the only solution is to reflash the device via cable or TFTP.