How to uninstall ANTEFRIGUS ransomware from operating systems

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

ANTEFRIGUS ransomware removal instructions


ANTEFRIGUS is the name of a ransomware infection. Generally, malware of this type is designed to encrypt files with a strong encryption algorithm that can only be decoded with specific decryption software and/or key. In fact, this particular ransomware does not encrypt files stored on the C (C:) drive. It does, however, encrypt data stored on other drives such as D, E, F, F, H and I. It appends a random extension to each encrypted file. For example, "1.jpg" might become "1.jpg.mewqsm", and so on for all affected files. Furthermore, ANTEFRIGUS creates a ransom message within a text file called "mewqsm-readme.txt" (its name is associated with the appended random extension).

The ransom message states that ANTEFRIGUS encrypts all files and they can be decrypted by following instructions provided on a Tor website. At the time of the research, the address provided was not accessible. Cyber criminals who designed ANTEFRIGUS encourage victims who have trouble accessing the website or other difficulties to send an email to In other cases, victims supposedly open the website and enter a key (provided in the ransom message) and appended extension. These cyber criminals also warn victims not to try to restore files using third party software or to modify them. These actions might apparently damage data permanently. As mentioned, this ransomware does not encrypt all files, only those that are stored on drives other than C:. Furthermore, it does not encrypt files that have certain extensions (a list of these extensions is provided below), however, it is possible that, in some cases, this ransomware encrypts no files at all. Some analyzed samples were broken and did not encrypt any data. In any case, we advise against contacting or paying any ransomware developers. In many cases, victims who trust them are scammed - they paid the ransom but received no decryption tools or keys. Generally, only the cyber criminals who developed the malware (ransomware) can provide tools to decrypt files. If your files are encrypted by ANTEFRIGUS, restore them from a backup if you have one. Ensure that this ransomware is removed from the system immediately. Note, however, that removing it will only prevent further encryption, whilst encrypted files remain inaccessible.

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

ANTEFRIGUS decrypt instructions

In most cases, ransomware-type programs are designed to lock (encrypt) files so that victims are forced to pay ransoms (purchase decryption tools/keys). Some examples of other malware of this type include Ninja, DoppelPaymer, and Peet. Main differences are cost of decryption and cryptographic algorithm (symmetric or asymmetric) used to block access to data. In some cases, files can be recovered without having to contact or pay ransomware developers, however, only if the ransomware is still in development and contains bugs/flaws, etc. It is likely that this is the case with the ANTEFRIGUS. In any case, to avoid data and financial loss in future, have your data backed up and store it on an unplugged storage device or a remote server such as Cloud.

How did ransomware infect my computer?

Typically, operating systems are infected with malware through spam campaigns, Trojans, fake software updaters, unofficial software activation ('cracking') tools and dubious download channels/sources. A common way to proliferate malware is to send emails that include malicious files (attachments). In most cases, cyber criminals attach Microsoft Office, PDF documents, executable files such as .exe, archive files such as ZIP, RAR and JavaScript files. If opened, these files install malicious software. Trojans are malicious programs that are often designed to proliferate and install other malware. Note, however, that this can only happen if the Trojan is already installed on the operating system. Fake software updating tools cause damage by downloading and installing malicious programs rather than various updates, or by exploiting vulnerabilities of already installed and outdated software. Unofficial activation tools supposedly allow users to bypass paid activation of licensed programs, however, this software can infect computers with high-risk malware. Untrustworthy software download channels such as freeware download websites, free file hosting websites, Peer-to-Peer networks (torrent clients, eMule), third party downloaders, installers can be used to distribute malware. To achieve this, cyber criminals disguise malicious files as legitimate, upload them, and wait for someone to download and open them. If opened, the files cause installation of malicious software.

Threat Summary:
Threat Type Ransomware, Crypto Virus, Files locker.
Encrypted Files Extension ANTEFRIGUS prepends a random extension, i.e. mewqsm
Ransom Demanding Message mewqsm-readme.txt (its name depends on the pre-pended extension).
Cyber Criminal Contact
Ransom Amount $1,995/$3,990 in Bitcoins.
Detection Names BitDefenderTheta (Gen:NN.ZexaF.32250.sy0@aWO6vFc), ESET-NOD32 (A Variant Of Win32/Kryptik.GYHS), Kaspersky (UDS:DangerousObject.Multi.Generic), Microsoft (Trojan:Win32/Wacatac.B!ml), 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.
Additional Information This ransomware does not encrypt files stored on the C (C:) drive. Some of the analyzed samples were broken and did not encrypt anything. It is very likely that this ransomware is still in a development state.
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

Download files and software only from official websites and via direct download links. None of the aforementioned or other similar sources should be trusted. If an email is received from a suspicious, unknown address and contains a web link or attachment, its contents should not be opened, especially if the received email is irrelevant. Installed software must be updated through tools or implemented functions  created by official developers. The same applies to software activation. It is illegal to activate any licensed software using unofficial activation ('cracking') tools. Scan the operating system for threats regularly with reputable antivirus or anti-spyware software. If your computer is already infected with ANTEFRIGUS, we recommend running a scan with Malwarebytes for Windows to automatically eliminate this ransomware.

Text in this file:

[+] Whats Happen ? [+]


Your files are encrypted, and currently unavailable.You can check it : all files on you computer has expansion mewqsm.
By the way, everything is possible to recover(restore), but you need to follow our instructions.Otherwise, you cant return your data(NEVER).


[+] What guarantees ? [+]


Its just a business.We absolutely do not care about youand your deals, except getting benefits.If we do not do our workand liabilities - nobody will not cooperate with us.Its not in our interests.
To check the ability of returning files, You should go to our website.There you can decrypt one file for free.That is our guarantee.
If you will not cooperate with our service - for us, its does not matter.But you will lose your timeand data, cause just we have the private key.In practise - time is much more valuable than money.


[+] How to get access on website ? [+]


You have two ways :
1)[Recommended] Using a TOR browser!
a) Download and install TOR browser from this site: hxxps://
b) Open our website :  hxxp://yboa7nidpv5jdtumgfm4fmmvju3ccxlleut2xvzgn5uqlbjd5n7p3kid.onion/?mewqsm


(If you canít follow the link or other difficulty write to the technical support email :


2) If TOR blocked in your country, try to use VPN! For this:
 a) Open any browser (Chrome, Firefox, Opera, IE, Edge) and download and install free VPN programm and download TOR browser from this site hxxps://
  b) If you are having difficulty purchase bitcoins, or you doubt in buying decryptor, contact to any data recovery company in your country, they will give you more guarantees and take purchase and decryption procedure on themselves. Almost all such companies heared about us and know that our decryption program work, so they can help you.


When you open our website, put the following data in the input form:



Extension name :  


--------- -

!!!DANGER !!!
DONT try to change files by yourself, DONT use any third party software for restoring your data or antivirus solutions - its may entail damge of the private keyand, as result, The Loss all data.
ONE MORE TIME : Its in your interests to get your files back.From our side, we(the best specialists) make everything for restoring, but please should not interfere.

Screenshot of pop-up displayed by ANTEFRIGUS once encryption is complete:

Pop-up displayed after ANTEFRIGUS ransomware is done encrypting

Text presented within this pop-up:


Your computer is encrypted !!! For decryption see the file with instructions on your desktop !!!

Screenshot of files encrypted by ANTEFRIGUS (random extension):

Files encrypted by ANTEFRIGUS

List of extensions that are not encrypted by ANTEFRIGUS:

adv, ani, bat, big, bin, cab, cmd, com, cpl, cur, deskthemepack, diagcab, diagcfg, diagpkg, dll, drv, exe, hlp, hta, icl, icns, ico, ics, idx, key, ldf, lnk, lock, mod, mpa, msc, msi, msp, msstyles, msu, nls, nomedia, ocx, pck, prf, rom, rtp, scr, shs, spl, sys, theme, themepack, wpx

ANTEFRIGUS 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 ANTEFRIGUS 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 ANTEFRIGUS 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 ANTEFRIGUS 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 ANTEFRIGUS 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 ANTEFRIGUS, 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 ANTEFRIGUS 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 ANTEFRIGUS 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
ANTEFRIGUS virus QR code
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