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Malware infecting multiple systems via router... possibility?

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#1 Barginski


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Posted 09 April 2014 - 10:22 PM

Hello all,


I recently got a new desktop PC, and am about to connect it to the internet. To do this, my service provider told me I'll have to connect it to the router used by the other desktop in my house. This concerns me a little bit, because the computer the router is connected to now has had a lengthy history of malware attacks.


So my question is this... Hypothetically, if System 1 was infected with malware, would it be at all possible for that malware to spread to an otherwise clean System 2, via the shared router? As soon as I can establish an internet connection on the new system, I'll be setting up Kaspersky AV 2014 and a full (paid) version of Malwarebytes.


Any input is appreciated. Thank you!

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#2 StudyVIruses


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Posted 09 April 2014 - 10:44 PM

Yes it would be possible for that to happen for example a virus called a worm.. can quickly spread through network routers and more.

#3 quietman7


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Posted 10 April 2014 - 05:28 AM

Routers can be compromised if they have a weak or default password which attackers can easily guess or break using a dictionary attack or brute force attack. Malware which can modify routers are rare and may require the router to be a specific make, model and firmware revision. The most common was the DNSChanger Trojan which compromised the router's weak default password using brute-force attacks. The Trojan then changed the router's DNS table to malicious DNS servers...redirecting Domain Name resolutions to unsolicited, illegal and malicious sites the attacker wanted victims to access.

...Some DNS changer Trojans can alter routers' DNS settings via brute-force attacks. As a result, all systems connected to the "infected" router also become infected. Some DNS changer Trojans can also be used to set up rogue Dynamic Host Configuration Protocol (DHCP) servers on certain networks, which can have the same effect.

How DNS Changer Trojans Direct Users to Threats
Millions Of Home Routers Vulnerable To Web Hack
Malware Silently Alters Wireless Router Settings

Some routers have known vulnerabilities which can be exploited to open them up to attacks without needing to know the proper password. There have been various reports of vulnerabilities and attacks against hardware devices such as routers and data storage. For example, Ars Technica reported that ASUS routers and any storage devices attached to them may be exposed to anyone online without the need of login credentials if users have taken advantage of remote access features built into the routers. Linksys routers have been reported to be vulnerable to a simple exploit that could give an attacker remote access to the router.Related ResourcesBest Practice:
1. Keep up to date with all security information related to your router.
2. Always reset your default router password with a strong password?.
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