How to uninstall Bozok malware?

Also Known As: Bozok Remote Administration Trojan
Type: Trojan
Distribution: Low
Damage level: Severe

Bozok virus removal guide

What is Bozok?

Bozok is the name of a Remote Access (Administration) Trojan, or simply a RAT. Malware of this type allows cyber criminals behind it to monitor and control victim's computer. Bozok can be used to upload and download files to/from victim's computer, start and end various processes, modify registry, steal stored (saved) passwords and execute various commands. Bozok is free, which increases the number of cyber criminals who could try to infect computers with it.

Bozok malware

One of the main things that cyber criminals can do with Bozok is to infect computers with some other malware by uploading and executing malicious files. They could install ransomware, other types of Trojans, cryptocurrency miners, or other malicious programs. Also, Bozok allows cyber criminals to download files stored on victim's computer, including personal, sensitive documents (e.g., financial documents) that may contain confidential information, passwords, etc. Furthermore, this RAT can be used to start and kill processes, for example, to end processes of running computer security software and prevent Bozok from being detected and/removed by it. As if it were not enough, this malware can be used to modify the registry, for example, to make sure it would launch itself after a reboot, to hide itself, to integrate with existing legitimate processes, and so on. Cyber criminals can use it to steal stored passwords as well, which means they could be capable to steal various accounts and use them for malicious purposes. For example, to make fraudulent purchases, transactions, trick other users into making money transactions, spread malware via email or other services, etc. Additionally, Bozok can be used to download and load a DLL plugin which extends its functionality with certain commands. Research shows that those commands can be used to start and stop a VNC (Virtual Network Computing) session, enable and disable webcam, start and stop keylogging, and perform other tasks. To sum up, having Bozok installed on a computer could cause problems such as identity theft, monetary, data loss, installation of unwanted, malicious software, issues related to online privacy, and/or other serious problems.

Threat Summary:
Name Bozok Remote Administration Trojan
Threat Type Trojan, password-stealing virus, banking malware, spyware.
Detection Names BitDefenderTheta (Gen:NN.ZevbaF.34128.Cn0@a8DwJ0mO), ESET-NOD32 (A Variant Of Win32/GenKryptik.CMKB), Kaspersky (Trojan.Win32.Boht.akq), Microsoft (Trojan:Win32/Wacatac.C!ml), Full List (VirusTotal)
Malicious Process Name(s) FastStone Capture (its name may vary)
Symptoms Remote Administration Trojans are designed to stealthily infiltrate the victim's computer and remain silent, and thus no particular symptoms are clearly visible on an infected machine.
Distribution methods Infected email attachments, malicious online advertisements, social engineering, software 'cracks'.
Damage Stolen passwords and banking information, identity theft, the victim's computer added to a botnet.
Malware Removal (Windows)

To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Malwarebytes.
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More examples of malware like Bozok (RATs) are DarkTrack, EpicSplit and VoidRAT. It is common that such software does not appear in a list of running processes, programs, which means that cyber criminals behind it have a greater chance to use it for a longer period of time and cause more damage. Therefore, it is important to take certain precautions to avoid installation of any RAT (or other malware), ways on how to avoid that are described below.

How did Bozok infiltrate my computer?

Research shows that cyber criminals attempt to trick users into installing Bozok through phishing campaigns. They send emails that contain some malicious attachment with a purpose to trick recipients into opening it. When opened, that attachment causes installation of Bozok. Some examples of files that cyber criminals attach to their emails to spread malware are malicious Microsoft Office documents, executable files like .exe, JavaScript files, PDF documents, archive files like RAR, ZIP. It is common that malware is distributed by using Trojans, unreliable software download channels, unofficial activation tools and fake updaters too. Trojans are malicious programs that often are designed to spread (install) other malware - cause chain infections. However, they can cause it only if users already have them installed on computers. Untrustworthy channels are used to proliferate malware by disguising malicious files as harmless, regular. When downloaded and opened/executed, those files install malware. Some examples of unreliable download channels are free file hosting, freeware download websites, unofficial pages, Peer-to-Peer networks (e.g., torrent clients, eMule), third party downloaders. Unofficial activation tools illegal programs that supposed to activate licensed software for free (bypass its activation). Although, such tools often are designed to install malware instead. Therefore, users who attempt to activate software this way often infect their computers by themselves. Fake software updaters can cause such damage either by installing malicious software instead of updates, fixes, or by exploiting bugs, flaws of outdated software that is installed on a computer.

How to avoid installation of malware?

Attachments and website links in irrelevant emails that are received from suspicious, unknown addresses should not be trusted (opened). It is because such emails often are sent by cyber criminals who seek to trick recipients into installing malware. Therefore, email contents should be opened only when there is not reason to think that it is not safe. Installed software must be updated and activated only with implemented functions and/or tools that are designed by official software developers. Third party, unofficial tools often cause installation of various malicious programs. Besides, it is not legal to activate any licensed programs with unofficial activators ('cracking' tools). All files and programs should be downloaded only from official, trustworthy websites, and via direct links. Other channels (like third party downloaders, Peer-to-Peer networks, unofficial sites) can be used as tools to distribute malicious software. The same applies to third party installers. And finally, the operating system should be regularly scanned for threats and it should be done by using a reputable antivirus or anti-spyware software. If you believe that your computer is already infected, we recommend running a scan with Malwarebytes for Windows to automatically eliminate infiltrated malware.

Malicious Bozok's process running in Task Manager as "FastStone Capture" (its name may vary):

bozok rat faststone capture malicious process in task manager

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Malwarebytes is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
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How to remove malware manually?

Manual malware removal is a complicated task - usually it is best to allow antivirus or anti-malware programs to do this automatically. To remove this malware we recommend using Malwarebytes for Windows. If you wish to remove malware manually, the first step is to identify the name of the malware that you are trying to remove. Here is an example of a suspicious program running on a user's computer:

malicious process running on user's computer sample

If you checked the list of programs running on your computer, for example, using task manager, and identified a program that looks suspicious, you should continue with these steps:

manual malware removal step 1Download a program called Autoruns. This program shows auto-start applications, Registry, and file system locations:

screenshot of autoruns application

manual malware removal step 2Restart your computer into Safe Mode:

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":


manual malware removal step 3Extract the downloaded archive and run the Autoruns.exe file.

extract and run autoruns.exe

manual malware removal step 4In the Autoruns application, click "Options" at the top and uncheck "Hide Empty Locations" and "Hide Windows Entries" options. After this procedure, click the "Refresh" icon.

Click 'Options' at the top and uncheck 'Hide Empty Locations' and 'Hide Windows Entries' options

manual malware removal step 5Check the list provided by the Autoruns application and locate the malware file that you want to eliminate.

You should write down its full path and name. Note that some malware hides process names under legitimate Windows process names. At this stage, it is very important to avoid removing system files. After you locate the suspicious program you wish to remove, right click your mouse over its name and choose "Delete".

locate the malware file you want to remove

After removing the malware through the Autoruns application (this ensures that the malware will not run automatically on the next system startup), you should search for the malware name on your computer. Be sure to enable hidden files and folders before proceeding. If you find the filename of the malware, be sure to remove it.

searching for malware file on your computer

Reboot your computer in normal mode. Following these steps should remove any malware from your computer. Note that manual threat removal requires advanced computer skills. If you do not have these skills, leave malware removal to antivirus and anti-malware programs. These steps might not work with advanced malware infections. As always it is best to prevent infection than try to remove malware later. To keep your computer safe, install the latest operating system updates and use antivirus software.

To be sure your computer is free of malware infections, we recommend scanning it with Malwarebytes for Windows.

About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
Bozok Remote Administration Trojan QR code
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