THREAT REMOVAL

What Is CCleaner Trojan.Nyetya Malware and How to Remove It

This article aims to help you by showing how to remove the CCeaner Trojan.Nyetya virus completely from your computer and how to protect yourself in the future as well.

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.

Threat Summary

Name CCleaner Trojan.Nyetya
Type Trojan Horse
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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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:

→ \workspace\ccleaner\branches\v5.33\bin\CCleaner\Release\CCleaner.pdb

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:

→ HKLM\SOFTWARE\Piriform\Agomo

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:

→ 216.126.225.148

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.

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Ventsislav Krastev

Ventsislav is a cybersecurity expert at SensorsTechForum since 2015. He has been researching, covering, helping victims with the latest malware infections plus testing and reviewing software and the newest tech developments. Having graduated Marketing as well, Ventsislav also has passion for learning new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management, Network Administration and Computer Administration of System Applications, he found his true calling within the cybersecrurity industry and is a strong believer in the education of every user towards online safety and security.

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How to Remove CCleaner Trojan.Nyetya from Windows.


Step 1: Boot Your PC In Safe Mode to isolate and remove CCleaner Trojan.Nyetya

OFFER

Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your PC with SpyHunter

Keep in mind, that SpyHunter’s scanner is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware removal tool to remove the malware threats. Read our SpyHunter 5 review. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria

1. Hold Windows key() + R


2. The "Run" Window will appear. In it, type "msconfig" and click OK.


3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".
Tip: Make sure to reverse those changes by unticking Safe Boot after that, because your system will always boot in Safe Boot from now on.


4. When prompted, click on "Restart" to go into Safe Mode.


5. You can recognise Safe Mode by the words written on the corners of your screen.


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. To do that:


1. Hold the Windows Logo Button and "R" on your keyboard. A Pop-up window will appear.


2. In the field type in "appwiz.cpl" and press ENTER.


3. This will open a window with all the programs installed on the PC. Select the program that you want to remove, and press "Uninstall"
Follow the instructions above and you will successfully uninstall most programs.


Step 3: Clean any registries, created by CCleaner Trojan.Nyetya 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 CCleaner Trojan.Nyetya there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.


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


3. You can remove the value of the virus by right-clicking on it and removing it.
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.

IMPORTANT!
Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode.
This will enable you to install and use SpyHunter 5 successfully.

Step 4: Scan for CCleaner Trojan.Nyetya 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.

SpyHunter5-update-2018


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

SpyHunter5-Free-Scan-2018


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-Free-Scan-Next-2018

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


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Get rid of CCleaner Trojan.Nyetya from Mac OS X.


Step 1: Uninstall CCleaner Trojan.Nyetya and remove related files and objects

OFFER
Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your Mac with SpyHunter for Mac
Keep in mind, that SpyHunter for Mac needs to purchased to remove the malware threats. Click on the corresponding links to check SpyHunter’s EULA and Privacy Policy


1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:


2. Find Activity Monitor and double-click it:


3. In the Activity Monitor look for any suspicious processes, belonging or related to CCleaner Trojan.Nyetya:

Tip: To quit a process completely, choose the “Force Quit” option.


4. Click on the "Go" button again, but this time select Applications. Another way is with the ⇧+⌘+A buttons.


5. In the Applications menu, look for any suspicious app or an app with a name, similar or identical to CCleaner Trojan.Nyetya. If you find it, right-click on the app and select “Move to Trash”.


6: Select Accounts, after which click on the Login Items preference. Your Mac will then show you a list of items that start automatically when you log in. Look for any suspicious apps identical or similar to CCleaner Trojan.Nyetya. Check the app you want to stop from running automatically and then select on the Minus (“-“) icon to hide it.


7: Remove any left-over files that might be related to this threat manually by following the sub-steps below:

  • 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:

Disclaimer! If you are about to tamper with Library files on Mac, be sure to know the name of the virus file, because if you delete the wrong file, it may cause irreversible damage to your MacOS. Continue on your own responsibility!

1: Click on "Go" and Then "Go to Folder" as shown underneath:

2: Type in "/Library/LauchAgents/" and click Ok:

3: Delete all of the virus files that have similar or the same name as CCleaner Trojan.Nyetya. If you believe there is no such file, do not delete anything.

You can repeat the same procedure with the following other Library directories:

→ ~/Library/LaunchAgents
/Library/LaunchDaemons

Tip: ~ is there on purpose, because it leads to more LaunchAgents.


Step 2: Scan for and remove malware from your Mac

When you are facing problems on your Mac as a result of unwanted scripts, programs and malware, the recommended way of eliminating the threat is by using an anti-malware program. Combo Cleaner offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.



Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer


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.


Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer


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.



Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer


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.



Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer


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".

stf-safari preferences


Step 4: After that, select the 'Extensions' Tab.

stf-safari-extensions


Step 5: Click once on the extension you want to remove.


Step 6: Click 'Uninstall'.

stf-safari 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.


How to Reset Safari
IMPORTANT: Before resetting Safari make sure you back up all your saved passwords within the browser in case you forget them.

Start Safari and then click on the gear leaver icon.

Click the Reset Safari button and you will reset the browser.


Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer


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.


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