Typosquatting is a type of social engineering attack, where a threat actor registers domains with deliberately misspelled names of known brands or websites and hosts malicious content on them or lures visitors to input sensitive data into the website. This type of attack targets internet users who incorrectly type a URL into their web browser or click on a URL in a phishing e-mail. To increase the chance of a successful cyber-attack, hackers will try to mimic the look of the original website.
Typosquatting is not limited only to well-known brands and websites. Any brand could be picked and sometimes it is even easier to perform this attack on lesser-known brands as the more believable domain names will be available for registering. Typosquatting is not only a problem for users, but it also damages brand’s and organization’s reputation which is the target of typosquatting.
In this article, we will show you how to detect typosquatting.
To detect typosquatting we will use a tool called DNSTwist by Marcin Ulikowski. The tool is written in Python and it works by generating a large list of permutations based on a domain name you provide and then it will check if any of those permutations are in use. On the provided GitHub, you can find installation instructions. You may also inspect requirements.txt to see any requirements for the tool.
There are two options for quick installation through Python’s PIP:
pip install dnstwist
pip install dnstwist[full]
The difference is that the full version will install all the requirements, while others will just install the bare minimum. You can also install the bare minimum version and install other requirements depending on your needs.
Now we need to think of what organization might be targeted by typosquatting attacks. You could use your own organization’s domain, but for this demo purposes let’s use something popular, like google.com.
Detecting potential domain abuse
We will execute the following command:
dnstwist --registered google.com
We are using an option registered in order to track only registered domains. You could also omit that, and the tool will output all the permutations to your input, even if they are not registered. That could be useful to you to track which similar domains are still available for purchase.
DNSTwist offers a lot more options that you can try out. One interesting feature is,ssdeepwhich is able to detect similar HTML source code. For each generated domain, the tools will fetch content from the responding HTTP server, normalize HTML code and compare its fuzzy hash with the one for the original domain (your input).
If you are not keen on CLI tools, you can try the browser version, but keep in mind that it does not allow for any advanced usage.
What to do once you detect potential domain abuse
Since Google is a popular brand and website, we received a lot of results. If we assume that you are Google and you find on this list a registered domain, such as goog1e.com and you can verify that it is not registered by yourself – this is then a potential suspect for typosquatting or domain abuse.
In such case, you would request a domain takedown. Domain takedown is a process of removing infringing domains from the internet. This is usually done on registrar level, but sometimes these might be slow or unresponsive.
At Conscia ThreatInsights we use a modified version of DNSTwist to detect potential domain abuse and if we confirm one, we can request a domain takedown on behalf of our clients.