.Best Ransomware

Also Known As: .Best virus
Distribution: Low
Damage level: Severe

.Best ransomware removal instructions

What is .Best?

Discovered by Jakub Kroustek, .Best is categorized as one of many ransomware-type programs. Ransomware is malicious software designed to encrypt files stored on systems and keep them in that state unless a decryption tool is purchased and ransom demands are met. This particular infection belongs to the Dharma ransomware family. Once files are encrypted, .Best renames them by adding an additional extension (".best"). For example, "1.jpg" might become "1.jpg.id-1E857D00.[bestdecoding@cock.li].best". As you can see, it not only adds the extension, but also, a unique victim ID and the developer's email address. The program displays ransom demand messages in a pop-up window and a text file called "FILES ENCRYPTED.txt".

"FILES ENCRYPTED.txt" is a short message containing two email addresses: bestdecoding@cock.li and best@decoding.biz. According to .Best's developers, these email addresses should be used when contacting them regarding a decryption tool. A message within the pop-up window informs users with computers infected with .Best that the cost of decryption (ransom size) depends on how quickly contact is made. It is also stated that the email should contain the assigned unique ID. They promise to send a decryption tool when the stipulated sum (cryptocurrency) is transferred to the Bitcoin wallet, which should be provided after sending a message to one of the email addresses provided. These ransomware developers offer free decryption of one file as a 'guarantee' that they can be trusted and have the tool required for successful decryption. Users can send one encrypted file (no larger than 1MB) and wait for them to reply, however, they also encourage victims not to use any other decryption tools or seek the help of other third parties. They state that this might lead to permanent data loss or the cost of decryption might be be increased. There are no tools capable of decryption of files encrypted by .Best free of charge (at least not at the moment). Most ransomware developers use cryptography algorithms (symmetric or asymmetric) that generate unique decryption keys. Therefore, no other tools can be used for decryption. Furthermore, cyber criminals store these keys on remote servers that are controlled only by them. Therefore, it is virtually impossible to decrypt files without the help of ransomware developers. Note, however, that cyber criminals should not be trusted. Sending money (cryptocurrency) to these people does not give any positive outcome. Once the ransom is received, cyber criminals simply ignore the victims. If your computer is infected with .Best or other ransomware, use a data backup and restore everything from there. This is the best, free way to restore lost files.

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

.Best decrypt instructions

There are many different ransomware-type programs online, however, most share similarities: they are used to encrypt data and make ransom demands. Some examples of other computer infections similar to .Best include Dcrtr-Crypt, LoryEstside, and AUF. There are many more. The main differences between these malicious programs are cost of decryption and cryptography used for encryption. It is usually impossible to decrypt data without using the tool held by ransomware developers. This might only be possible if the ransomware is still in development or contains bugs/flaws. In any case, we advise you to maintain regular backups and store them on remote servers or unplugged storage devices. Locally stored backups are often encrypted together with regular data .

How did ransomware infect my computer?

It is not known exactly how .Best's developers distribute this ransomware, however, there are some common ways used to proliferate computer infections of this type. Cyber criminals use spam email campaigns, trojans, untrustworthy software download sources, fake software updaters and software cracking tools. Spam campaigns infect computers through email attachments. Cyber criminals attach Microsoft Office, archive, PDF, executable or other files, and send them to many people and hope that a percentage of them open the attachment. Once opened, it downloads and installs computer infections such as .Best (or other). Trojans are malicious programs that, if installed, proliferate other infections - they cause chain infections. Untrustworthy download sources such as free file hosting websites, freeware download websites, peer-to-peer networks (torrent clients, eMule, etc.), third party software downloaders/installers and other sources are also used to distribute malware. Typically, they present malicious files as legitimate, thus tricking many people into installing infections. Fake software updaters are used as tools to download malicious programs or other threats rather than the promised updates, or to exploit outdated software bugs and flaws. Some cyber criminals use software cracking tools to proliferate their infections. Rather than cracking paid software, users allow these tools to download and install malicious programs. This is a very common method used to distribute malware.

Threat Summary:
Name.Best virus
Threat TypeRansomware, Crypto Virus, Files locker
SymptomsCan't open files stored on your computer, previously functional files now have a different extension, for example my.docx.locked. A ransom demanding message is displayed on your desktop. Cyber criminals are asking to pay a ransom (usually in bitcoins) to unlock your files.
Distribution methodsInfected email attachments (macros), torrent websites, malicious ads.
DamageAll 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.

To eliminate .Best virus our malware researchers recommend scanning your computer with Spyhunter.
▼ Download Spyhunter
Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

How to protect yourself from ransomware infections?

To keep computers (operating systems) safe from various infections, very cautious when browsing the internet and downloading, installing, and updating software. Handle links or attachments presented in emails with care. If the email is irrelevant or the sender seems suspicious, do not open the links or attachments. Do not use software cracking tools. this is classed as cyber crime. Furthermore, these tools often infect computers rather than providing users with the expected software. Download software from official sources and via direct download links only. Many third party downloaders/installers include rogue applications and, therefore, these tools should not be used. Keep installed programs and operating systems updated, however, update them using implemented functions or tools provided by the official developer. Have a reputable anti-virus/anti-spyware suite installed and running/enabled - these tools can detect malware or other infections before any damage is done. If your computer is already infected with .Best, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in .Best ransomware pop-up window:

All your files have been encrypted!
All your files have been encrypted due to a security problem with your PC. If you want to restore them, write us to the e-mail bestdecoding@cock.li
Write this ID in the title of your message 1E857D00
In case of no answer in 24 hours write us to theese e-mails:best@decoding.biz
You have to pay for decryption in Bitcoins. The price depends on how fast you write to us. After payment we will send you the decryption tool that will decrypt all your files.
Free decryption as guarantee
Before paying you can send us up to 1 file for free decryption. The total size of files must be less than 1Mb (non archived), and files should not contain valuable information. (databases,backups, large excel sheets, etc.)
How to obtain Bitcoins
The easiest way to buy bitcoins is LocalBitcoins site. You have to register, click 'Buy bitcoins', and select the seller by payment method and price.
Also you can find other places to buy Bitcoins and beginners guide here:
Do not rename encrypted files.
Do not try to decrypt your data using third party software, it may cause permanent data loss.
Decryption of your files with the help of third parties may cause increased price (they add their fee to our) or you can become a victim of a scam.

Screenshot of .Best text file:

.Best text file

Text presented in .Best text file ("FILES ENCRYPTED")

all your data has been locked us
You want to return?
write email bestdecoding@cock.li or best@decoding.biz

Screenshot of files encrypted by .Best (".best" extension, which also contains an ID and email address):

Files encrypted by .Best

.Best ransomware removal:

Instant automatic removal of .Best virus: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of .Best virus. Download it by clicking the button below:
▼ DOWNLOAD Spyhunter By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

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 .Best 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 .Best 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 .Best 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 .Best 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 .Best, 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 .Best 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 as well as 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 .Best 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 pcrisk.com 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 virus and spyware activity level today:

Medium threat activity

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

QR Code
.Best virus QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of .Best virus on your mobile device.
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Platform: Windows

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