Home > Trojan > Cloud9 Malicious Browser Extension Removal

Cloud9 Malicious Browser Extension Removal

What Is Cloud9 Malware?

cloud9-malicious-browser-extension-removal-sensorstechforumCloud9 is a recently discovered malicious browser extension that targets the most popular browsers, including Google Chrome, Mozilla Firefox, Microsoft Edge, and Internet Explorer.

The primary method of distribution, according to Zimperium zLabs researchers, is side-loading via fake executables and malicious websites that prompt users to install fake Adobe Flash Player updates.

The malicious browser extension can steal information during the victim’s browser session and can install additional malware. This is done so that its operators can gain control over the infected system. The end purpose is turning the infected device into a bot by adding it to a botnet. Thus, security researchers are also referring to the extension as Cloud 9 JavaScript Botnet.

N.B. Security researchers are warning that Cloud9’s malware developers are targeting all popular types of browsers and operating systems. The number of infected users is currently unknown, but considering the attack’s mechanism, the number could be quite large.

Cloud9 Malware Summary

Name Cloud9
Type Browser Extension / Trojan / Malware
Short Description Capable of stealing information, performing ad and code injection, installing additional malware, etc.
Symptoms Pop-unders, lack of operational resources, worsened browser performance
Distribution Method Side-loading and fake Adobe Flash Player updates
Detection Tool See If Your Device Has Been Affected by Cloud9


Malware Removal Tool

User Experience Join Our Forum to Discuss Cloud9.

Cloud9 – How Is It Distributed?

According to the researcher’s report, no traces of the Cloud9 extension were found on any official browser extension store. The hackers were mainly relying on threat actor communities to spread it. The main distribution tactics used in these campaigns include side-loading through fake executables and malicious websites that trigger Adobe Flash Player updates.

Other popular methods that hackers use to distribute various types of malware across the web include malicious spam (malspam) that contains fake email attachments and malicious links, and trojanized downloads. These malware distribution methods highlight the importance of being vigilant while surfing the web. Be careful when planning to download software from freeware websites, as their installers can contain malicious code.

Since most malware and ransomware campaigns rely on malspam, we also advise you to watch out for malicious emails. These are often masqueraded as legitimate messages urging you to perform a specific action. Double-check the sender before opening an unexpected email that tries to trick you into doing something particular.

Cloud9 – What Does It Do?

The Cloud9 malicious extension capabilities include:

  • Sending GET/POST requests to get malicious resources;
  • CookieStealing, which can compromise user sessions;
  • Keylogging;
  • Performing a Layer 4 / Layer 7 hybrid attack that can initiate DDos attacks from the victim’s PC;
  • Detecting the operating system and browser to initiate further payloads;
  • Executing pop-unders for malicious advertising;
  • Executing JavaScript code from other sources that can be used to inject more malicious code;
  • Silently loading webpages for ad and malicious code injections;
  • Mining cryptocurrencies on the browser and leveraging the computer’s resources;
  • Sending browser exploits to take over the victim’s device.

Is Cloud9 Browser Extension a Virus?

No, it is not a virus. Cloud9 often disguises itself as a legitimate browser extension, but its main purpose is to collect user data, display intrusive advertisements, redirect web traffic, or modify browser settings without the user’s consent. It can be inadvertently installed through software bundling, deceptive downloads, or clicking on malicious links. Once infected, the Cloud9 Browser Extension Virus can compromise the user’s privacy, security, and browsing experience. It is advisable to remove this virus promptly using reputable anti-malware software to protect your system and data.

Is It Dangerous?

The Cloud9 browser extension can be considered potentially dangerous or unwanted due to its intrusive behavior and potential risks. While not all instances of the Cloud9 extension may be malicious, some versions have been associated with unwanted activities such as data collection, intrusive advertising, browser hijacking, and unauthorized modifications to browser settings. These actions can compromise user privacy, security, and browsing experience.

How to Remove Cloud9 Malware

Since this is a highly malicious threat that can expose your computer at risk of various attacks, we advise you to proceed with extra caution. The use of a professional anti-malware program for the removal of Cloud9 is recommended. However, we have also provided manual removal instructions. You can combine both methods for maximum efficiency.

Milena Dimitrova

An inspired writer and content manager who has been with SensorsTechForum since the project started. A professional with 10+ years of experience in creating engaging content. Focused on user privacy and malware development, she strongly believes in a world where cybersecurity plays a central role. If common sense makes no sense, she will be there to take notes. Those notes may later turn into articles! Follow Milena @Milenyim

More Posts

Follow Me:

Preparation before removing Cloud9.

Before starting the actual removal process, we recommend that you do the following preparation steps.

  • Make sure you have these instructions always open and in front of your eyes.
  • Do a backup of all of your files, even if they could be damaged. You should back up your data with a cloud backup solution and insure your files against any type of loss, even from the most severe threats.
  • Be patient as this could take a while.
  • Scan for Malware
  • Fix Registries
  • Remove Virus Files

Step 1: Scan for Cloud9 with SpyHunter Anti-Malware Tool

1. Click on the "Download" button to proceed to SpyHunter's download page.

It is recommended to run a scan before purchasing the full version of the software to make sure that the current version of the malware can be detected by SpyHunter. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria.

2. After you have installed SpyHunter, wait for it to update automatically.

SpyHunter 5 Scan Step 1

3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.

SpyHunter 5 Scan Step 2

4. After SpyHunter has finished scanning your PC for any files of the associated threat and found them, you can try to get them removed automatically and permanently by clicking on the 'Next' button.

SpyHunter 5 Scan Step 3

If any threats have been removed, it is highly recommended to restart your PC.

Step 2: Clean any registries, created by Cloud9 on your computer.

The usually targeted registries of Windows machines are the following:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

You can access them by opening the Windows registry editor and deleting any values, created by Cloud9 there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.
Remove Virus Trojan Step 6

2. When you open it, you can freely navigate to the Run and RunOnce keys, whose locations are shown above.
Remove Virus Trojan Step 7

3. You can remove the value of the virus by right-clicking on it and removing it.
Remove Virus Trojan Step 8 Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.

Step 3: Find virus files created by Cloud9 on your PC.

1.For Windows 8, 8.1 and 10.

For Newer Windows Operating Systems

1: On your keyboard press + R and write explorer.exe in the Run text box and then click on the Ok button.

Remove Virus Trojan Step 9

2: Click on your PC from the quick access bar. This is usually an icon with a monitor and its name is either “My Computer”, “My PC” or “This PC” or whatever you have named it.

Remove Virus Trojan Step 10

3: Navigate to the search box in the top-right of your PC's screen and type “fileextension:” and after which type the file extension. If you are looking for malicious executables, an example may be "fileextension:exe". After doing that, leave a space and type the file name you believe the malware has created. Here is how it may appear if your file has been found:

file extension malicious

N.B. We recommend to wait for the green loading bar in the navigation box to fill up in case the PC is looking for the file and hasn't found it yet.

2.For Windows XP, Vista, and 7.

For Older Windows Operating Systems

In older Windows OS's the conventional approach should be the effective one:

1: Click on the Start Menu icon (usually on your bottom-left) and then choose the Search preference.

Remove Virus Trojan

2: After the search window appears, choose More Advanced Options from the search assistant box. Another way is by clicking on All Files and Folders.

Remove Virus Trojan Step 11

3: After that type the name of the file you are looking for and click on the Search button. This might take some time after which results will appear. If you have found the malicious file, you may copy or open its location by right-clicking on it.

Now you should be able to discover any file on Windows as long as it is on your hard drive and is not concealed via special software.

Cloud9 FAQ

What Does Cloud9 Trojan Do?

The Cloud9 Trojan is a malicious computer program designed to disrupt, damage, or gain unauthorized access to a computer system.

It can be used to steal sensitive data, gain control over a system, or launch other malicious activities.

Can Trojans Steal Passwords?

Yes, Trojans, like Cloud9, can steal passwords. These malicious programs are designed to gain access to a user's computer, spy on victims and steal sensitive information such as banking details and passwords.

Can Cloud9 Trojan Hide Itself?

Yes, it can. A Trojan can use various techniques to mask itself, including rootkits, encryption, and obfuscation, to hide from security scanners and evade detection.

Can a Trojan be Removed by Factory Reset?

Yes, a Trojan can be removed by factory resetting your device. This is because it will restore the device to its original state, eliminating any malicious software that may have been installed. Bear in mind, that there are more sophisticated Trojans, that leave backdoors and reinfect even after factory reset.

Can Cloud9 Trojan Infect WiFi?

Yes, it is possible for a Trojan to infect WiFi networks. When a user connects to the infected network, the Trojan can spread to other connected devices and can access sensitive information on the network.

Can Trojans Be Deleted?

Yes, Trojans can be deleted. This is typically done by running a powerful anti-virus or anti-malware program that is designed to detect and remove malicious files. In some cases, manual deletion of the Trojan may also be necessary.

Can Trojans Steal Files?

Yes, Trojans can steal files if they are installed on a computer. This is done by allowing the malware author or user to gain access to the computer and then steal the files stored on it.

Which Anti-Malware Can Remove Trojans?

Anti-malware programs such as SpyHunter are capable of scanning for and removing Trojans from your computer. It is important to keep your anti-malware up to date and regularly scan your system for any malicious software.

Can Trojans Infect USB?

Yes, Trojans can infect USB devices. USB Trojans typically spread through malicious files downloaded from the internet or shared via email, allowing the hacker to gain access to a user's confidential data.

About the Cloud9 Research

The content we publish on SensorsTechForum.com, this Cloud9 how-to removal guide included, is the outcome of extensive research, hard work and our team’s devotion to help you remove the specific trojan problem.

How did we conduct the research on Cloud9?

Please note that our research is based on an independent investigation. We are in contact with independent security researchers, thanks to which we receive daily updates on the latest malware definitions, including the various types of trojans (backdoor, downloader, infostealer, ransom, etc.)

Furthermore, the research behind the Cloud9 threat is backed with VirusTotal.

To better understand the threat posed by trojans, please refer to the following articles which provide knowledgeable details.

Leave a Comment

Your email address will not be published. Required fields are marked *

This website uses cookies to improve user experience. By using our website you consent to all cookies in accordance with our Privacy Policy.
I Agree