In today's digital world, where Internet of Things As the internet penetrates every home, the router is no longer just a device for distributing a signal. It has become a fully-fledged computer with its own operating system, often based on Linux, and a permanent IP address. It is this feature that makes routers an attractive target for hackers creating botnets for DDoS attacks or stealing confidential user data.
Many owners are unaware that their home network is already infected. Unlike viruses on PCs, router malware operates at the network level, intercepting traffic from all connected devices, including smartphones and TVs. Changing DNS addresses to attacker servers is the most common sign of a device compromise. If you notice any strange network behavior, you shouldn't ignore it.
Scanning a router requires a comprehensive approach, as standard computer antivirus software doesn't always detect threats hidden in the network equipment firmware. You'll need to analyze logs, check DNS settings, and possibly reflash the firmware. Let's take a detailed look at how to detect and neutralize hidden threats.
⚠️ Please note: Admin panel interfaces (web interfaces) may vary significantly across different manufacturers (TP-Link, ASUS, Keenetic, MikroTik). The layout of menu items changes with the release of new firmware versions, so please consult the official documentation for your model.
The main signs of a router infection
The first step to security is proper diagnosis. Users often confuse hardware malfunctions with a virus attack. However, there are specific symptoms that indicate that router is controlled by third parties. If you see that the antivirus software on your connected laptop is blocking malicious links even though you haven't downloaded anything, this is a warning sign.
Pay attention to your internet speed. A sudden drop in internet speed, especially during off-peak hours, may indicate that your device has become part of a botnet. Attackers are using your network resources to send spam or attack other servers, which creates a significant load on your bandwidth.
- 🚩 Unexpected password change from Wi-Fi or admin panel without your participation.
- 🚩 Unknown devices appear in the list of connected clients (
StatusorWireless). - 🚩 Blocking access to antivirus company websites or router manufacturer technical support sites.
- 🚩 Pop-up windows demanding payment even on devices without a browser (e.g. Smart TV).
Another clear sign is a change in your browser's start page or redirected search queries. You search for information on Google, but end up on strange websites with ads. This is the result of substitution. DNS servers in the router settings. Checking these parameters is a mandatory diagnostic step.
Diagnostics via the administrative panel
To perform a thorough check, you need to access the device's settings. You'll need to connect to the router's network (via cable or Wi-Fi) and enter its IP address in the browser's address bar. Standard addresses usually look like this: 192.168.0.1 or 192.168.1.1Login requires authorization.
After entering the interface admin panels First of all, check the section responsible for the Internet connection. It may be called WAN, Internet or NetworkFind the fields where DNS addresses are listed. Normally, these should contain your provider's addresses or automatic settings. If you see unknown IP addresses (often servers in other countries), the virus has already invaded.
Next, go to the system logs section (System Log or Logs). This is where the event history is stored. Look for multiple login attempts from different IP addresses or strange system messages about service restarts. Successful logins while you were sleeping indicate that the administrator account has been compromised.
Check the list of connected devices (Attached Devices, DHCP Client List). Compare the number of gadgets with the actual number of your smartphones, PCs, and TVs. If you see a device with an unfamiliar MAC address or name (for example, Unknown-Device), block his access immediately.
| Verification parameter | Normal condition | Sign of a virus |
|---|---|---|
| DNS servers | Automatically or provider IP | Unknown IP addresses (often foreign) |
| Client list | Only your devices | Unnecessary gadgets or "Unknown" |
| Remote control port | Disabled | Enabled on port 8080/80 |
| CPU load | Low idle | Constantly high (100%) |
Scanning the network with special utilities
A router's built-in tools are often insufficient for a complete diagnosis. Specialized network scanners installed on a computer come to the rescue. Programs like Fing, Advanced IP Scanner or Angry IP Scanner Allows you to see the network through the eyes of an administrator. They show open ports and firmware versions.
Use utilities to check for open ports. Viruses often open ports for remote botnet control. If the scanner shows open ports that you haven't configured (for example, Telnet port 23 or SSH port 22), this is a critical vulnerability. On home networks, these ports should be closed to access from the external network (WAN).
☑️ Network security check
Some modern antivirus systems, such as Kaspersky or ESET, have home network testing modules (Home Network Protection). They can scan your router for known vulnerabilities and weak passwords. Run a full network scan through your antivirus software interface.
⚠️ Warning: Scanners may show false positives on some service ports. Before panicking, check your router documentation to see which ports are used for normal functions (e.g., IPTV or VoIP).
Methods for cleaning and removing malware
If a threat is confirmed, you need to act quickly. The most reliable way is a full factory reset (Factory Reset). This is guaranteed to remove any virus from RAM and modified configuration files. Find the button on the router body. Reset (often recessed into the body).
To reset, press and hold the button for about 10-15 seconds until the indicators flash simultaneously. The router will then reboot to its original state. It's important to understand: this method will not only remove the virus, but also all your internet settings, network names, and passwords. You'll have to set up the router again.
What to do if the Reset button does not work?
If a software reset is impossible or the button doesn't respond, try finding the contacts labeled RST on the device's board. With the power on, carefully short them with tweezers for a few seconds. Caution and electronics skills are required!
An alternative, more complex method is reflashing (Flashing). If the virus managed to infect the firmware itself (which is rare, but possible), a reset won't help. You'll need to download the official firmware from the manufacturer's website specifically for your model and hardware version. Use the section System Tools → Firmware Upgrade Download the file. This will completely overwrite the system code.
After clearing or resetting, immediately change your password for accessing the admin panel. Default passwords are admin/admin are known to all hackers. Create a complex password using letters, numbers, and symbols. Also, change the Wi-Fi network password using an encryption standard. WPA2-PSK or WPA3.
Setting up protection after cleaning
Simply removing the virus isn't enough; you need to prevent re-infection. First, disable the remote control feature (Remote Management or Web Management from WANThis feature allows you to manage your router from anywhere in the world, which is convenient for administrators but dangerous for regular users.
Be sure to update your firmware to the latest available version. Manufacturers regularly release security patches that close holes that allow viruses to penetrate. Enable automatic updates if your model router This supports this. This will save you from having to manually monitor releases.
- 🔒 Disable the protocol WPS (Wi-Fi Protected Setup), as it is vulnerable to PIN guessing.
- 🔒 Use MAC address filtering for critical devices.
- 🔒 Disable UPnP if it is not used regularly by games or torrents.
Regularly check your event logs. If you notice suspicious activity again, one of your client devices (computers or phones) may be infected and constantly trying to inject the virus back into the router. Run a full scan of all devices on the network.
Network security prevention
Network security is an ongoing process. Don't connect guest devices to your home Wi-Fi unsupervised. It's best to set up a separate guest network for guests (Guest Network), which is isolated from your main local network. If a guest device is infected, your files and printers will remain safe.
Make sure your router is physically accessible. If the device is located in a public area (office, cafe, hallway), an intruder can simply press the reset button or connect a cable. In such cases, it's critical to change the default password immediately after purchase.
Use complex passwords not only for Wi-Fi but also for your manufacturer account if your router is cloud-based (e.g., TP-Link ID or Keenetic Cloud). Hacking a cloud account gives a hacker complete control over the router from anywhere, bypassing local security.
Can an antivirus program on a computer detect a virus in a router?
A standard antivirus scans files on the hard drive and the PC's RAM. It doesn't have direct access to the router's file system. However, network modules in antivirus programs can detect traffic anomalies or DNS redirects, which indirectly indicate a problem.
Will the virus be cleared if I simply unplug the router?
No. Most viruses write themselves to a configuration file stored in non-volatile memory. After powering on, the router will load the infected settings. Only a hard reset or a firmware update will help.
Is it dangerous to buy a used router?
Yes, there is a risk. The previous owner may not have performed a factory reset, or the device may have been infected before sale. Always perform a factory reset and update the firmware immediately after purchasing used equipment.
How often should I change my Wi-Fi password?
We recommend changing your password every 3-6 months, as well as any time you share it with guests or repair technicians. This minimizes the risk of unauthorized access.
What is DNS Hijacking?
This is an attack in which a virus changes the DNS settings on your router. As a result, when you enter a bank or social media address, you're redirected to a fake website that's visually indistinguishable from the original but designed to steal passwords.