New Malvertising Campaign Caught Poking at Chrome’s Backdoor…


December 7, 2021

I bet that headline caught your attention! I regret nothing! You clicked, didn’t you?

Anyways, puns and innuendo aside, there is a new Malvertising campaign making the rounds designed to target Chrome via malicious extensions. These extensions, designed to look like popular applications,  create backdoors in the software that nefarious cybercriminals use to pilfer personal identifiable information (PII) data.

The group behind the campaign is called Magnat. They specifically target people looking for popular software via search engines. Once the victim clicks on a malicious link to a fake installer, their endpoint is infected with a password stealer called “RedLineStealer,” as well as a Chrome extension called “MagnatExtension” that’s designed to log keystrokes and take screenshots. The endpoint is also infected with an AutoIt-based backdoor that allows remote access.

MagnatExtension pretends to be Google’s Safe Browsing, also allows bad guys to gram cookies and execute naughty JavaScript code.

What can you do to prevent Magnat from wreaking havoc?

It’s super easy to download and install software nowadays. That goes for browser plugins as well. There are a few basic steps you should be taking as well. Here’s our list of seven steps EVERY municipality should do RIGHT NOW to help them avoid cyber attacks:

1. Restrict egress by source, identity, and protocols
“This way to the egress!” If you’re not familiar with the quote, it’s okay. It’s an obscure one. P.T. Barnum came up with it. It was a way to trick people who visited his exhibits into leaving without knowing they were doing so. 

This can apply, in a way to network traffic as well. It’s important to know not only where traffic is coming to on your network, but where it’s going to as well. Yes, some outbound traffic might be normal, or even welcome. That doesn’t mean all of it is.

Outbound traffic should be restricted by source, identity, and protocols. Start by making a list of remote services you should be communicating with regularly. After that, it’s important to scan your network to see if there’s any outbound traffic you don’t recognize, identify what it is and then block it accordingly.

Consider implementing a DENY ALL outbound traffic policy (with logging enabled) as well that limits outbound traffic of any type to what you expressly allow.

2. Implement Web Filtering to block known bad, unacceptable and unknown traffic

Beyond what some say can result in a possible increase in general workforce productivity, web filtering is better-leveraged blocking known bad websites as well as unacceptable and unknown traffic.

Properly setting up web filtering services on your firewalls can save you hours of headache. Most either have a service built-in or that you can subscribe to that will do most of the heavy lifting for you. Yeah occasionally you might bump into oddly misclassified websites or whatnot, but ultimately it does a pretty darn good job of keeping people safe on the internet.

We use FortiGuard and recommend it to anyone using a FortiGate device. Of course, Fortinet isn’t alone in offering a web filtering product. Others like Cisco and Barracuda (to name a few) do as well.

3. Block and alert on Botnet and C&C traffic

Botnets are nasty, nasty things. They can be difficult to detect too since they’re designed to operate without end-users knowledge. But you’re in luck, there are a few common things you can look for. 

  • IRC traffic (botnets and botmasters use IRC for communications)
  • Connection attempts with known C&C servers
  • Multiple machines on a network making identical DNS requests
  • High outgoing SMTP traffic (as a result of sending spam)
  • Unexpected popups (as a result of click-fraud activity)
  • Slow computing/high CPU usage
  • Spikes in traffic, especially Port 6667 (used for IRC), Port 25 (used in email spamming), and Port 1080 (used by proxy servers)
  • Outbound messages (email, social media, instant messages, etc) that weren’t sent by the user
  • Problems with Internet access
4. Implement Deep Packet Inspection
Implementing Deep Packet Inspection (DPI) allows you to analyze encrypted traffic that’s being sent over your network. DPI allows you to take action against traffic by blocking, re-routing, or logging it. DPI can also be used to make sure data is formatted correctly, look for malicious code, or if someone is eavesdropping on your network traffic.
DPI benefits include:
  • Filter and analyze messages
  • Open and close ports
  • Perform in-line spam screening
  • Proxy your IM traffic
  • Perform SSL session inspections
  • Prevent security breaches

We’re big believers in not being able to manage what you don’t measure. By analyzing your network traffic you get a much better idea of what’s going on day to day. DPI can help you accomplish that.

5. Enforce Application Control, limited to applications that are both known and sanctioned

Today’s world is all about apps! I don’t mean appetizers (but if that’s where your first thought went I like where your head’s at). I mean applications. You can’t do anything without ’em! They enable us.

But there are a lot of bad or questionable apps out there and it’s real easy to install them. By enforcing application control you can limit what gets installed on your endpoints to only what is known and what is sanctioned by you. You can implement application control rather easily by applying the principle of least privilege when assigning user rights.
Keep in mind that the average user doesn’t usually need to install any sort of application on their end-point to do their job. They should already have all the tools they need. Limiting their ability to do so from the get-go might be a solution you want to consider.


6. Install a next-generation endpoint protection application on your end-points and configure it to block scripts
There are a lot of products out there to consider when it comes to protecting your end-points. We’d never shy away from our love of Cylance but we’ll be the first to admit they’re not the only game in town and there are a lot of solutions out there that would probably work for you. What matters is you pick something and install it.

One of the biggest threats to municipalities, in general, is malware infestation. A next-generation end-point protection tool with script blocking configured can do a lot to stop your town from falling victim to a would-be attacker and meeting a similar fate to the towns we listed above.


7. Educate your end-users so they become more security-minded; start by enabling external email identification notifications

I am a big believer in the idea that the best way to protect yourself from something is to know as much as you can about it. If malware is as much a threat to municipalities as it appears to be (and it is) the best way to avoid an infestation is to not only educate yourself regarding the matter but the other people in the organization as well.

Yes, a next-generation endpoint protection product can help you avoid such an awful fate, but it’s much better to be proactive than reactive and a great way to do that is via security awareness training for your end-users.

Another way to accomplish this is to set up external email notifications that remind people not to do things like download and open attachments from people you don’t know. External email notifications are exceptionally easy to set up and implement (as you can see in this article:

Bonus Content

Google also allows you to directly block apps and extensions from being installed on managed Chrome Browsers or Chrome OS devices. You can read their article on the subject here.

You can also watch a video on the subject:


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Carl Keyser is the Content Manager at Integris.

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