Djvu VirusRansomwareRemoval Guide

Qlln Virus Removal Guide (+Decrypt .qlln files)

Qlln – Ransomware

Qlln is a malicious software application working as common ransomware. Michael Gillespie, the widely known malware researcher, first found this new name in the DJVU ransomware family.

Qlln was developed for the sole function to encrypt all popular file types. Logically, as quickly as the file encryption is successfully achieved, the users are not able to get access to them. Qlln ransomware adds its own “.qlln” to all the encrypted data. For example, the file “price_list.xls”, when crypted by Qlln, will be entitled as “price_list.xls.qlln”. When the file encryption is accomplished, Qlln puts its own special text file (_readme.txt) into all the folders that store the encrypted files.

The alert stated by _readme.txt requesting the random os very similar to the alerts offered by other ransomware risks belonging to the DJVU family. The warning generally indicates that the files have been secured and the only option to get access to it is to use an unique standalone key. Regretfully, this statement is absolutely true.

The method to secure the files utilized by Qlln is not entirely looked into. However, there is no doubt that each computer owner may be released an unique decryption key, which is definitely unique. It is incredibly difficult to recover the information without the suitable key in place.

“Don’t worry, you can return all your files!”, from text file message:

message from Qlln virus

One more peculiarity of the Qlln infection is that the users are not able to get access to the key. The decrypting key is hosted on a special server under the complete control by the crooks who have released the Qlln virus into the world wide web. In order to acquire the key and bring back the important data, the users are informed to get in touch with the scams by means of e-mail or by telegram and to pay the ransom in the amount of $980.

The message also states that individuals need to contact the Qlln authors within 72 hours upon the moment of the data file encryption. The alert indicates that by doing so individuals will acquire a 50% discount rate, therefore, the ransom amount falls to $490.

No matter what the quantity of the ransom is, we strongly encourage that you do not pay the ransom. There is no warranty that these online scoundrels will keep their promises, so they may not care at all what the victims feel about the file encryption, even when the quantity of the ransom is received into their accounts. Thus, paying ransom often does not lead to a successful healing. So, the users may just lose their money for absolutely nothing.

Likewise, we urge you not to contact the scams as they advise. Do not transfer money into their wallets. There are no applications that might break the Qlln virus or bring back the data at no charge. Therefore, the only appropriate decision is to restore the data from possible backups (if available).

Virus Summary

NameQlln Ransomware
File Extensionqlln
Short DescriptionThe ransomware encrypts all the data stored on your system and requires a ransom to be paid on your part supposedly to recover your important files.
SymptomsFile encryption by the ransomware is performed by means of the AES-256 algorithm (CFB mode) encryption algorithm. Once the encryption is completed, the ransomware adds its special .qlln extension to all the files modified by it.
Distribution MethodAdware bundles and software cracks
Similar InfectionsLokas, Besub, Nusar
Qlln Removal Tool   GridinSoft Anti-Malware
Qlln Decryption Tool   Emsisoft Djvu Decryptor

Do not forget that the Internet is now filled with infections similar to the Qlln ransomware. For example, this particular risk is basically identical to Brusaf and other ransomware-type infections. These damaging utilities have been developed in order to encrypt the crucial information and reveal the need for the users to pay the ransom. All these infections utilize the similar algorithm to produce the particular key for successful information decryption.

Unless the Qlln ransomware is still under the advancement process or has got some hidden bugs, it is not possible to restore the data manually. Therefore, the only working service to avoid the loss of your crucial data is to regularly maintain up-to-date backups of all your crucial data.

Another essential piece of recommendations is to save the backups on unique storage not linked to your primary computer. For instance, you might store it on the USB Flash Drive, or some external drive, or by using the cloud data storage services. Keeping the backups on your regular drive is extremely dangerous, since the backup may likewise be secured by the Qlln .

Leakages for the Qlln ransomware attack.

Qlln uses numerous courses to penetrate the vulnerable computer systems. It is not particular what particular method was used in your case, however, the intrusion might happen through the following channels:

  • bundling with third-party programs, mainly freeware;
  • spam e-mails from the unidentified senders;
  • websites providing free hosting;
  • P2P (peer-to-peer) torrent downloads.

There are times when the Qlln may camouflage itself as some authentic application, for instance, through the misleading signals demanding installation of some software upgrade. This is the most common trick used by the scams to inject the Qlln infection files into the system. By doing this users partially participate in its installation, without plainly comprehending the risk.

In addition, the scams might send unsolicited spam email with tricky informs motivating individuals to open suspicious attachments or click on some download links, for example, those encouraging the people to open certain pictures, text files, tax files and other info.

No doubt, opening these files or clicking the malicious links may essentially harm the system. Fake Media Player upgrade alerts may result in the Qlln ransomware infiltration. Similarly, downloading the cracked software may furthermore consist of the ransomware installer. The last but not the least, installation of Qlln might take place through some Trojan horses that might be installed stealthily into the system and without the user’s direct consent and even authorization.

Avoiding the Qlln ransomware injection.

Obviously, there is no absolute warranty that your computer system will be constantly free of any malware attacks, nevertheless, we would like to share some helpful tips with you to make it more secure. Make certain to pay very very close attention while searching the web and specifically while downloading cost-free programs. Do not open any dubious email attachments, specifically if the sender is not known to you.

Do not forget that particular freeware installer might also include some other extra apps in the bundle. These additional applications may be very damaging. It is of utmost value to keep your anti-virus software and your os in basic to be constantly appropriately upgraded.

It is quite sensible that downloading cracked apps is illegal, however, additionally, such unapproved programs use may likewise bring major damage to your computer. Thus, do not download any split programs. Plus, the fact that your current anti-virus did not safeguard the system from the Qlln ransomware is a great factor for you to reevaluate your choices and switch to another program that can render the safeguarding functions on a better level.

Below please find the quotation from the Qlln text file:


 Don't worry, you can return all your files!
 All your files like photos, databases, documents and other important are encrypted with strongest encryption and unique key.
 The only method of recovering files is to purchase decrypt tool and unique key for you.
 This software will decrypt all your encrypted files.
 What guarantees you have?
 You can send one of your encrypted file from your PC and we decrypt it for free.
 But we can decrypt only 1 file for free. File must not contain valuable information.
 You can get and look video overview decrypt tool:
 Price of private key and decrypt software is $980.
 Discount 50% available if you contact us first 72 hours, that's price for you is $490.
 Please note that you'll never restore your data without payment.
 Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours.

 To get this software you need write on our e-mail:

 Reserve e-mail address to contact us:

 Our Telegram account:

Screenshot of files with “.qlln” extension added by the ransomware:”

Qlln Ransomware - encrypt files with .qlln extension

Use GridinSoft Anti-Malware to remove Qlln ransomware from your computer

1.Download GridinSoft Anti-Malware.

You can download GridinSoft Anti-Malware by clicking the button below:

  GridinSoft Anti-Malware

2. Double-click on the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-ag.exe file to install GridinSoft Anti-Malware on your computer.
GridinSoft Anti-Malware
An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.
GridinSoft Anti-Malware Setup

3. Press Install button for run GridinSoft Anti-Malware.

GridinSoft Anti-Malware Install

3.Once installed, GridinSoft Anti-Malware will automatically run.

GridinSoft Anti-Malware  Start

4. Wait for the GridinSoft Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your computer for Win Speedup 2018 and other malicious programs. This process can take a 20-30 minutes, so we suggest you periodically check on the status of the scan process.
GridinSoft Anti-Malware Scan

5. Click on “Clean Now”.

When the scan has completed, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.
GridinSoft Anti-Malware Scan Result

Use Emsisoft Decryptor for restore qlln files

You can get Emsisoft Decryptor by clicking the button below:

  Emsisoft Decryptor

  1. Run the decryptor as an administrator. The license terms will show up, which you have to agree to by clicking the “Yes” button.
  2. Once the license terms are accepted, the primary decryptor user interface opens.
  3. By default, the decryptor will pre-populate the locations to decrypt with the currently connected drives and network drives. Additional locations can be added using the Add” button.
  4. Decryptors typically offer various options depending on the particular malware family. The available options are located in the Options tab and can be enabled or disabled there. You can find a detailed list of the available Options below.
  5. After you have added all the locations you want to decrypt to the list, click the “Decrypt” button to start the decryption process. The screen will switch to a status view, informing you about the current process and decryption status of your files
  6. The decryptor will inform you once the decryption process is finished. If you require the report for your personal records, you can save it by clicking the “Save log” button. You can also copy it straight to your clipboard to paste it into emails or forum posts if you are asked to.
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Daniel Zimmermann

Daniel Zimmermann has been writing on security and malware subjects for many years and has been working in the security industry for over 10 years. Daniel was educated at the Saarland University in Saarbrücken, Germany and currently lives in New York.

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