How to remove Mikser ransomware from the operating system?

Also Known As: Mikser virus
Distribution: Low
Damage level: Severe

Mikser ransomware removal instructions

What is the Mikser ransomware?

Mikser is a malicious program, classified as ransomware. Credit for its discovery belongs to GrujaRS. This malware operates by encrypting data and demanding payment for the decryption. Typically, ransomware-type programs append all affected files with an extension; that is not the case with Mikser. Once the encryption process is complete, a pop-up window is displayed. The text presented in it is the ransom note - in Polish.

The ransom-demanding message in the pop-up informs victims that their data has been encrypted. To recover the files, users are told that they must pay a ransom - 1 BTC (Bitcoin cryptocurrency). This sum is worth approximately 6,200 USD (note, exchange rates constantly fluctuate). After the ransom is paid, users are promised to be sent the necessary decryption keys/tools to decrypt their data. Unfortunately, in most cases of ransomware infections, without the interference of the cyber criminals responsible - decryption is impossible. It might be possible, if the malware is still in development and/or has bugs (flaws). Regardless of the circumstances, it is strongly advised against meeting the demands of criminals. As often, despite paying - victims do not receive the decryption tools. Hence, their files remain encrypted and worthless, and users experience significant financial losses. Removing Mikser ransomware will prevent it from further encryptions, however it will not restore already compromised data. The only solution is recovering the files from a backup, if one was created before the infection and was stored in a different location.

Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:

Mikser decrypt instructions (pop-up)

Ransomware is designed to encrypt data and demand a ransom for the decryption tools/software. NEPHILIMNEMTY REVENUE 3.1Likud are a few examples of such programs. There are two main differences between them: the cryptographic algorithm they use (symmetric or asymmetric) and the size of the demanded payment. The sums tend to vary from three and four digits (in USD). Digital currencies (e.g. cryptocurrencies, pre-paid vouchers, etc.) are usually used for the ransoms, since transactions of them are difficult/impossible to trace. To avoid permanent data loss, it is recommended to keep backups in remote servers and/or unplugged storage devices (preferably, in several separate locations).

How did ransomware infect my computer?

Ransomware and other malware commonly spread via trojans, spam campaigns, software "cracking" (activation) tools, fake updates and untrustworthy download channels. Trojans are a type of malicious software that have various abilities, which can feature the ability to cause chain infections (i.e. download/installation of additional malware). Spam campaigns are used to send deceptive/scam emails with malicious files attached to (or linked inside) them - on a mass scale. Virulent files can be in a variety of formats (e.g. Microsoft Office and PDF documents, archive and executable files, JavaScript, etc.) and when they are opened - it jumpstarts the infection process. Rather than activate licensed product, "cracks" can download/install malicious programs. Illegitimate updaters infect systems by abusing flaws of outdated products and/or simply install malware instead of the updates. Malicious content can be inadvertently downloaded from untrustworthy sources (e.g. unofficial and free file-hosting sites, Peer-to-Peer sharing networks and other third party downloaders).

Threat Summary:
Name Mikser virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension Encrypted files are not appended with an extension.
Ransom Demanding Message Text presented in the pop-up window.
Ransom Amount 1 BTC (Bitcoin cryptocurrency)
Cyber Criminals' Cryptowallet Address 13AM4VW2dhxYgXeQepoHkHSQuy6NgaEb94 (Bitcoin)
Detection Names Avast (FileRepMalware), BitDefender (Trojan.GenericKD.33583210), ESET-NOD32 (A Variant Of MSIL/Filecoder.YQ), Kaspersky (UDS:DangerousObject.Multi.Generic), Full List Of Detections (VirusTotal)
Symptoms Cannot open files stored on your computer, previously functional files now have a different extension (for example, my.docx.locked). A ransom demand message is displayed on your desktop. Cyber criminals demand payment of a ransom (usually in bitcoins) to unlock your files.
Distribution methods Infected email attachments (macros), torrent websites, malicious ads.
Damage All files are encrypted and cannot be opened without paying a ransom. Additional password-stealing trojans and malware infections can be installed together with a ransomware infection.
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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How to protect yourself from ransomware infections?

It is highly recommended not to open suspicious and/or irrelevant emails, especially ones received from unknown/suspect senders (addresses). Any attachments (or links) present in dubious letters - must not be opened, as that can result in a malware infection. Only official and verified download channels should be used. Additionally, all products should be activated and updated with tools/functions, provided by genuine developers. Illegal activation ("cracking") tools and third party updaters are deemed to be high-risk, hence they are advised against use. To protect device and user safety, it is crucial to have a reputable anti-virus/anti-spyware software installed and kept up-to-date. Furthermore, it should be used to run regular system scans and to remove detected threats/issues. If your computer is already infected with Mikser, we recommend running a scan with Malwarebytes for Windows to automatically eliminate this ransomware.

Text presented in Mikser ransomware's pop-up window:


Yo! Zaszyfrowałem twoje pliki kolego
Daj mi bitcoina to je odzaszyfruje

Przelej mi 1 BTC to moż e pomyśle o odzaszyfrowaniu ci plików.
No to tyle ode mnie

Adres: 13AM4VW2dhxYgXeQepoHkHSQuy6NgaEb94

Zapłaciłem! Oddaj mi moje pliki!


Screenshot of files encrypted by Mikser:

Files encrypted by Mikser ransomware (no extension)

Mikser ransomware removal:

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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Quick menu:

Step 1

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":

Step 2

Log in to the account infected with the Mikser virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the Mikser ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining Mikser ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of Mikser are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by Mikser, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as Mikser ransomware.

Note that Windows 10 Fall Creators Update includes a "Controlled Folder Access" feature that blocks ransomware attempts to encrypt your files. By default, this feature automatically protects files stored in the Documents, Pictures, Videos, Music, Favorites, and Desktop folders.

Controll Folder Access

Windows 10 users should install this update to protect their data from ransomware attacks. Here is more information on how to get this update and add an additional protection layer from ransomware infections.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove Mikser ransomware:

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.

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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
Mikser virus QR code
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