If you are reading this article, chances are you have CCleaner installed on your computer. News broke out recently that hackers managed to slither a backdoor into two versions of CCleaner – CCleaner 5.33.6162 and v1.07.3191 of CCleaner Cloud. The infection happened via two primary Trojan horses – the Trojan.Floxif and Trojan.Nyetya. If you have one of the following versions of CCleaner installed on your computer, we advise you to read this article in order to learn how to detect and remove the Trojan.Nyetya infection.
|Short Description||Aims to infect your computer and steal information from it or assume administrative control over it.|
|Symptoms||Registry entries added in multiple Windows registry sub-keys, like the “Agomo” key. Suspicious files created on your computer.|
|Distribution Method||Via CCleaner version 5.33.6162 and CCleaner Cloud version 1.07.3191.|
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|User Experience||Join Our Forum to Discuss CCleaner Trojan.Nyetya.|
How Does Trojan.Nyetya Infect CCleaner
During their research, security experts have established that n artifact was found within the binary of the CCleaner, called CCleaner.pdb. The artifact is located in the following directory:
When researchers cross referenced this with the valid certificate of the software, they have concluded that most likely a hacker compromised a segment of the development in order to create a separate environment that grants it access in order to perform the malicious operations. The way the malware installation works is when you install CCleaner itself, there is a function in it, called ‘__scrt_get_dyn_tls_init_callback’ and it calls a code execution which in turn results to the successful dropping of the payload of the CCleaner Trojan.Nyetya on the infected computer system.
CCleaner Trojan.Nyetya Analysis
Similar to the Floxif trojan, Trojan.Nyetya drops a malicious file, named CBkrdr.dll and this file may be located in the following directory:
→ C:\Program Files\Common Files\System\
After the initial malicious file has been dropped on the infected computer, the virus may modify the registry editor of the infected computer, adding a Windows registry sub-key, going by the name “Agomo”. It has the following location:
In addition to this, the Trojan.Nyetya also connects to a remote C2 server in order to transmit data via HTTPS POST request. The connection is to the following IP address:
From there, it may execute the loader and CCleaner may appear to look normal. However, the Trojan.Nyetya profiles the system, analyses if the user is administrator and transmits data from the infected machine to the C2 server. This data may be:
- Your keystrokes.
- Your saved passwords on your browsers.
- Important documents.
- Screenshots of your desktop.
- Network information. (IP, MAC, Next hop addresses, etc.)
- Financial data.
- Data from external devices (USB, SD cards, etc.)
- Install other malware.
So far is known that there are over 5 million installations of CCleaner each week and the app is installed in all 55 languages it offers, which means that the situation has already spread on a global scale. Security experts have managed to contain the situation by upgrading the software to version 5.34, but it will take time for some users to learn about the breach and update their systems.
In addition to this, Avast, who bought the Piriform, the developers of CCleaner on July 18, have released a report in which law enforcement, Cisco and Avast have conducted their investigations on the matter and have taken down the C&C server of the malware and registered multiple domains which could have been used in the future infections of the both Trojans. This has resulted in the new patched versions which were released, called CCleaner 5.34 and CCleaner Cloud 1.07.3214. This has resulted to the number of infected user machines decreasing from ~2 million to under a million computers.
How to Remove CCleaner Trojan.Nyetya from Your Computer
In order to successfully delete this Trojan horse from your PC, manual removal may prove to be a tricky process. This is why, it is strongly advisable to follow the removal instructions below.
The best course of action according to security experts at this point is to download an advanced anti-malware software which will automatically scan for the malicious objects created and modified by this malware and delete them permanently.
- Guide 1: How to Remove CCleaner Trojan.Nyetya from Windows.
- Guide 2: Get rid of CCleaner Trojan.Nyetya on Mac OS X.
- Guide 3: Remove CCleaner Trojan.Nyetya in Google Chrome.
- Guide 4: Erase CCleaner Trojan.Nyetya from Mozilla Firefox.
- Guide 5: Uninstall CCleaner Trojan.Nyetya from Microsoft Edge.
- Guide 6: Remove CCleaner Trojan.Nyetya from Safari.
- Guide 7: Eliminate CCleaner Trojan.Nyetya from Internet Explorer.
- Guide 8: Disable CCleaner Trojan.Nyetya Push Notifications in Your Browsers.
How to Remove CCleaner Trojan.Nyetya from Windows.
Step 1: Boot Your PC In Safe Mode to isolate and remove CCleaner Trojan.Nyetya
Step 2: Uninstall CCleaner Trojan.Nyetya and related software from Windows
Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it.
Step 3: Clean any registries, created by CCleaner Trojan.Nyetya on your computer.
The usually targeted registries of Windows machines are the following:
You can access them by opening the Windows registry editor and deleting any values, created by CCleaner Trojan.Nyetya there. This can happen by following the steps underneath:
Get rid of CCleaner Trojan.Nyetya from Mac OS X.
Step 1: Uninstall CCleaner Trojan.Nyetya and remove related files and objects
1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:
- Go to Finder.
- In the search bar type the name of the app that you want to remove.
- Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
- If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.
In case you cannot remove CCleaner Trojan.Nyetya via Step 1 above:
In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:
You can repeat the same procedure with the following other Library directories:
Tip: ~ is there on purpose, because it leads to more LaunchAgents.
Step 2: Scan for and remove CCleaner Trojan.Nyetya files from your Mac
When you are facing problems on your Mac as a result of unwanted scripts and programs such as CCleaner Trojan.Nyetya, the recommended way of eliminating the threat is by using an anti-malware program. SpyHunter for Mac offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.
Remove CCleaner Trojan.Nyetya from Google Chrome.
Step 1: Start Google Chrome and open the drop menu
Step 2: Move the cursor over "Tools" and then from the extended menu choose "Extensions"
Step 3: From the opened "Extensions" menu locate the unwanted extension and click on its "Remove" button.
Step 4: After the extension is removed, restart Google Chrome by closing it from the red "X" button at the top right corner and start it again.
Erase CCleaner Trojan.Nyetya from Mozilla Firefox.
Step 1: Start Mozilla Firefox. Open the menu window
Step 2: Select the "Add-ons" icon from the menu.
Step 3: Select the unwanted extension and click "Remove"
Step 4: After the extension is removed, restart Mozilla Firefox by closing it from the red "X" button at the top right corner and start it again.
Uninstall CCleaner Trojan.Nyetya from Microsoft Edge.
Step 1: Start Edge browser.
Step 2: Open the drop menu by clicking on the icon at the top right corner.
Step 3: From the drop menu select "Extensions".
Step 4: Choose the suspected malicious extension you want to remove and then click on the gear icon.
Step 5: Remove the malicious extension by scrolling down and then clicking on Uninstall.
Remove CCleaner Trojan.Nyetya from Safari.
Step 1: Start the Safari app.
Step 2: After hovering your mouse cursor to the top of the screen, click on the Safari text to open its drop down menu.
Step 3: From the menu, click on "Preferences".
Step 4: After that, select the 'Extensions' Tab.
Step 5: Click once on the extension you want to remove.
Step 6: Click 'Uninstall'.
A pop-up window will appear asking for confirmation to uninstall the extension. Select 'Uninstall' again, and the CCleaner Trojan.Nyetya will be removed.
Eliminate CCleaner Trojan.Nyetya from Internet Explorer.
Step 1: Start Internet Explorer.
Step 2: Click on the gear icon labeled 'Tools' to open the drop menu and select 'Manage Add-ons'
Step 3: In the 'Manage Add-ons' window.
Step 4: Select the extension you want to remove and then click 'Disable'. A pop-up window will appear to inform you that you are about to disable the selected extension, and some more add-ons might be disabled as well. Leave all the boxes checked, and click 'Disable'.
Step 5: After the unwanted extension has been removed, restart Internet Explorer by closing it from the red 'X' button located at the top right corner and start it again.
Remove Push Notifications caused by CCleaner Trojan.Nyetya from Your Browsers.
Turn Off Push Notifications from Google Chrome
To disable any Push Notices from Google Chrome browser, please follow the steps below:
Step 1: Go to Settings in Chrome.
Step 2: In Settings, select “Advanced Settings”:
Step 3: Click “Content Settings”:
Step 4: Open “Notifications”:
Step 5: Click the three dots and choose Block, Edit or Remove options:
Remove Push Notifications on Firefox
Step 1: Go to Firefox Options.
Step 2: Go to “Settings”, type “notifications” in the search bar and click "Settings":
Step 3: Click “Remove” on any site you wish notifications gone and click “Save Changes”
Stop Push Notifications on Opera
Step 1: In Opera, press ALT+P to go to Settings
Step 2: In Setting search, type “Content” to go to Content Settings.
Step 3: Open Notifications:
Step 4: Do the same as you did with Google Chrome (explained below):
Eliminate Push Notifications on Safari
Step 1: Open Safari Preferences.
Step 2: Choose the domain from where you like push pop-ups gone and change to "Deny" from "Allow".