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Remove CCleaner 5.33 virus (Removal Guide) - updated May 2020

removal by Olivia Morelli - - | Type: Malware

CCleaner v5.33 virus is the corrupted utility version that brings Floxif malware to 2.27 million users via a hacked executable file

CCleaner virus

CCleaner virus defines a corrupted v5.3 version of a well-known anti-malware tool CCleaner. By using the Advanced Persistent Threat (APT) type of attack[1], the perpetrators have managed to violate the distribution network and deliver malware in the disguise of a certified CCleaner 5.33 version.  

The malware, which gained the name of Floxif Trojan[2], managed to deceive over 2 million users that they had downloaded a validated CCleaner version 5.33 and CCleaner Cloud 1.07.3191. The attack began on August 15 and lasted up to September 12, 2017, when security experts have managed to detect the felony. 

The malware gets executed if the user was using the admin account, so low-privileged account users who have installed the CCleaner 5.33 file were not affected. This malware affected main accounts and administrative accounts of devices that got this malicious version of the tool.

Updating to 3.34 version can remove the corrupted file and the tool. But for those who want to be totally safe additional actions should be helpful. The infected computer should not be used until the machine is cleaned from malware, resetting passwords is highly advised to stop Floxif infection and attackers from running deeper into the system and stealing passwords or other sensitive details. 

Name CCleaner 5.33 virus
Type Malware. the Floxif virus gets delivered via the corrupted version of a cleaner utility
Functions The virus can collect data from the machine and download or execute other malware directly in the background since it gains admin rights
Damage The threat can use stolen data to identify each unique device and attackers may target particular people with secondary payload drops. Having administrative rights on the computer means that hackers can easily download and launch scripts or programs directly on the system
Distribution Downloading the CCleaner version that was corrupted between August and September in 2017. Trojans can also use other methods of spreading like malicious files and other executables download via torrent services and fake program providers
Removal To remove CCleaner 5.33 virus, you need to get rid of the executable file itself. Updating to other versions may help, but malware should be eliminated using AV tools and security programs
Additional tips Even though updating to clean versions of the program can help with eliminating the trojan, other programs may be left behind or alterations that malware makes still trigger issues with your machine, so rely on Reimage Reimage Cleaner Intego or PC repair tools to check or even fix virus damage

Update September 28th, 2017Though Avast who now owns the tool originally created by Piriform, has stated that the malware was terminated, it seems that the cyber criminals continued the assault. The first stage of the CC Cleaner virus attack sparked assumptions that the endpoint target was ordinary users. Floxif trojan which behaves as a backdoor virus was programmed to collect information about victims' and send the data to a remote server. 

Due to the overload of the server, the database had crashed. It led malware developers to rebuild the database and initiate a second stage of the attack. It then revealed that ordinary users were only an intermediary chain to target major companies: Microsoft, Sony, Samsung, Cisco, VMware, D-Link, Linksys, HTC.

A recent analysis revealed over 700 000 devices were infected and approximately 20 companies have been infected with the malware within the span of 4 days.[3] Telecommunication and social network companies are among the most affected targets. The companies in Japan and Taiwan reported having the utmost number of infected computers – 10 and 13 – respectively.

Main facts about the Piriform malware (Floxif):

  • Floxif CCleaner Trojan was embedded in the 32-bit version of CCleaner 5.33.6162 and CCleaner Cloud 1.07.3191. The attackers added the malware into the main executable of the software, known as CCleaner.exe.
  • The malicious version was publicly available to download between August 15, 2017, and September 15, 2017. The company that owns the rights to the software reported that approximately 2.27 million people installed and used the compromised version of the PC optimization software.
  • The compromised version installed a backdoor to victim’s computers that was capable of transmitting certain data to C&C server.
  • Infected users should immediately update to 5.34 version of the software and take actions to change passwords and other sensitive data that criminals could have accessed.
  • Two IP addresses – and – are associated with the hackers.

Research suggests that updating might not be enough as criminals have included a previously undiscovered payload. Victims are advised to restore their computer from backups to erase the malware entirely.

The compromised version of CCleaner 5.33 included a malicious payload that contained a Domain Generation Algorithm (DGA) and ability to communicate with Command & Control (C&C) server. The virus used that connection to transmit all kinds of data from victim’s computer, including, but not limited to:

  • Computer’s name;
  • List of installed programs;
  • List of network adapters;
  • Unique IDs;
  • List of active processes.

To protect your computer and complete CCleaner virus removal, you must update from v5.33 to v.34 IMMEDIATELY. The impact of the malware is high, however, considering that the software manages to score up to 2 billion downloads per month, the situation could have been worse.  CCleaner malwareFloxif is the name of the malware found in CCleaner 5.33 version.

Besides, the compromised version could have brought more malware to your computer (as it reportedly could do so), so we strongly recommend scanning your computer with anti-malware software to remove CCleaner Floxif Trojan remains and other dangerous programs at once. You may also need to repair some damage that the virus leftover, so rely on PC repair tools that are reliable like Reimage Reimage Cleaner Intego.

CCleaner malware begins its second payload

Researchers from Talos Intelligence have reported[4] a second CCleaner virus’ payload that was aimed at a limited number of high-profile tech companies based on their domains. Criminals tried to compromise one of the largest companies, including:

Akamai, Intel, Microsoft, Google, Samsung, Sony, VMware, HTC, Linksys, D-Link, Cisco.

The second payload starts with an installer called GeeSetup_x86.dll. Once activated, it determines what is the version of the system – 32 or 64-bit and then drops the trojan on it. The one for 32-bit version is called TSMSISrv.dll, and the other one is EFACli64.dll. It appears that malicious actors sought to steal intellectual property from the listed technology firms.

Transmission of the trojan-backdoor

As we specified before, original servers of CCleaner were compromised during the cyber attack, and it means that the malware was available to everyone who downloaded the software from Piriform’s website.

The updated version was released on August 15th, 2017, meaning that it was the date when users started to download the compromised version on their computers unknowingly. warns[5] that the same thing could have happened to anyone who installed an update for the PC optimization software between August 15 and September 15 of 2017.

Is CCleaner safe?

Note that Piriform[6] CCleaner program itself is NOT a virus. It is an entirely legitimate software that you can use, however, malicious actors used illegal methods to break into companies’ servers and inject malicious scripts into the signed software.

Right when security experts detected C Cleaner virus, Avast issued an official statement urging users and companies update to 5.34 version. However, there is still a lack of information how the perpetrators have managed to continue the assault.

In order to ensure that your computer is safe from the malware, uninstall the program, scan the system using a security tool, and reinstall CCleaner 5.34 version. Now let us discuss options how to remove CCleaner malware.

Perform CCleaner virus removal

Research suggests that it might not be enough to remove CCleaner virus by updating it to 5.34 version. Since the second payload was discovered, we recommend cleaning your computer fundamentally. Security tools like SpyHunter 5Combo Cleaner or Malwarebytes should help, or you can rely on more powerful AV programs.

Therefore, we recommend you to restore your computer from a backup (created before installation of the malware) and then double-check your PC with PC repair software like Reimage Reimage Cleaner Intego that can find affected files. You can find instructions on how to clean your computer below that include additional tips for rebooting the PC in Safe Mode, for example.

Once you complete CCleaner removal, protect the accounts that you accessed while the malicious version of computer optimization software was running on your PC. We strongly recommend you change your passwords using a device that wasn’t compromised – ideally, your phone.

do it now!
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Compatible with Microsoft Windows Supported versions Compatible with OS X Supported versions
What to do if failed?
If you failed to remove virus damage using Reimage Intego, submit a question to our support team and provide as much details as possible.
Reimage Intego has a free limited scanner. Reimage Intego offers more through scan when you purchase its full version. When free scanner detects issues, you can fix them using free manual repairs or you can decide to purchase the full version in order to fix them automatically.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Reimage, try running SpyHunter 5.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Intego, try running Combo Cleaner.

To remove CCleaner 5.33 virus, follow these steps:

Remove CCleaner 5.33 using Safe Mode with Networking

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove CCleaner 5.33

    Log in to your infected account and start the browser. Download Reimage Reimage Cleaner Intego or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete CCleaner 5.33 removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove CCleaner 5.33 using System Restore

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of CCleaner 5.33. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage Reimage Cleaner Intego and make sure that CCleaner 5.33 removal is performed successfully.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from CCleaner 5.33 and other ransomwares, use a reputable anti-spyware, such as Reimage Reimage Cleaner Intego, SpyHunter 5Combo Cleaner or Malwarebytes

Access your website securely from any location

When you work on the domain, site, blog, or different project that requires constant management, content creation, or coding, you may need to connect to the server and content management service more often. It is a hassle when your website is protected from suspicious connections and unauthorized IP addresses.

The best solution for creating a tighter network could be a dedicated/fixed IP address. If you make your IP address static and set to your device, you can connect to the CMS from any location and do not create any additional issues for server or network manager that need to monitor connections and activities. This is how you bypass some of the authentications factors and can remotely use your banking accounts without triggering suspicious with each login. 

VPN software providers like Private Internet Access can help you with such settings and offer the option to control the online reputation and manage projects easily from any part of the world. It is better to clock the access to your website from different IP addresses. So you can keep the project safe and secure when you have the dedicated IP address VPN and protected access to the content management system.

Backup files for the later use, in case of the malware attack

Computer users can suffer various losses due to cyber infections or their own faulty doings. Software issues created by malware or direct data loss due to encryption can lead to problems with your device or permanent damage. When you have proper up-to-date backups, you can easily recover after such an incident and get back to work.

It is crucial to create updates to your backups after any changes on the device, so you can get back to the point you were working on when malware changes anything or issues with the device causes data or performance corruption. Rely on such behavior and make file backup your daily or weekly habit.

When you have the previous version of every important document or project you can avoid frustration and breakdowns. It comes in handy when malware occurs out of nowhere. Use Data Recovery Pro for the system restoring purpose.

About the author
Olivia Morelli
Olivia Morelli - Ransomware analyst

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