Lssr ransomware (virus) - Bonus: Decryption Steps

Lssr virus Removal Guide

What is Lssr ransomware?

Lssr ransomware is a virus designed to lock videos, music, and other files on your computer and hold them hostage until a ransom is paid

Lssr ransomwareThis is the threat that connects to the machine to find files for possible encryption

Lssr ransomware – a computer infection that encrypts all personal files with the help of a mixed encryption algorithm. Then it can mark files with the .lssr extension, restricting access to them. Malware then drops a ransom note _readme.txt, which claims that the only way to securely return data is by paying a ransom – it should be delivered using bitcoin digital currency. The ransom amount starts at $980, but criminals offer the discount to make people more eager to pay. However, experts[1] do not recommend considering the payment. Even when the amount is less than a few hundred. If you transfer money but files remain locked, you lose money and data.

This virus derives from a well-known Djvu ransomware family, which was first spotted many years back and since then released multiple variants, including Piiq, Pooe, Leex. In this article, we will provide alternative methods for .lssr file recovery and safe ways of deleting the infection from a Windows computer. It is crucial to clear the infection before you try to restore affected pieces, so the system cannot be affected again. If files get encrypted once again, that data gets permanently damaged.

If you have been infected by one of the Djvu/STOP ransomware variants, it is possible that your computer's encryption can be decrypted offline using a program like Emsisoft decryptor. However, it must also be mentioned that this will not work for everyone – only if data was locked via an offline ID when the malicious software couldn't connect to the remote server and use the online ID creation method.

Otherwise, if you are infected by an earlier version of the same virus, your only option is to pay the ransom. A better way to avoid being infected with Lssr ransomware is by downloading apps from trusted sources and not from third-party app stores or links placed in random email messages.

Cryptocurrency extortion malwareMalicious files can be hidden and the virus active but unnoticed until the ransom note is presented

Furthermore, it's always a good idea to have a reliable anti-malware tool installed on your computer. The ransom message that appears in the _readme.txt file states that all of the user's details were stored on servers controlled by criminals, and all they need from them is just one thing: money. It then encourages users to send Bitcoin payments as soon as possible. In most cases, the amount you are expected to pay varies, but this family hasn't changed the ransom amount, contact information, and the name of the ransom note for years now.

The ransom note file reads:


Don't worry, you can return all your files!
All your files like pictures, 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:

Your personal ID:

If you think your files were locked with an offline ID and can't be recovered now, try again later. You also need to upload a set of documents – one encrypted and another that's healthy before the company sends it back. This test decryption is one of the many methods used to fake the legitimacy of the decryptor tool that criminals promote.

Name Lssr virus
Type Ransomware, crypto-virus, file locking virus
Malware family Djvu/STOP ransomware
Extension Files appended with .lssr extension, e.g., “picture.jpg” is turned into “picture.jpg.lssr”
Ransom note _readme.txt

File recovery If no backups are available, recovering data is almost impossible. Nonetheless, we suggest you try the alternative methods that could help you in some cases – we list them below
Malware removal Perform a full system scan with powerful security software
System fix Malware can seriously tamper with Windows systems, causing errors, crashes, lag, and other stability issues after it is terminated. To remediate the OS and avoid its reinstallation, we recommend scanning it with the FortectIntego repair tool

If you got your files encrypted using this threat, you have the option to wait until the decryption creators have more time on their hands for creating the tool capable of recovering these types of threats. When the encryption is done locally without any online key-sharing service involved in the process, the possibility of decryption is bigger. When offline IDs are user, the option is very unlikely since there needs to be somebody that paid asked ransom and got their encrypted data recovered.

Using file-sharing sites in order to download software can also be risky – even if it's from well-known and legitimate developers. Sometimes malicious files may be attached as part of the installer without any knowledge of the developer itself, so even installing a necessary application may put your devices at risk. This is one of the common methods used to spread threats like the Lssr file virus.

Clear the system and repair needed computer functions

You can restore your files after the infection. It can be done using versions from a different device that is not infected yet. If your computer had any USB, it different drives connected. They most likely got infected and files on them – encrypted. Unfortunately, it is too easy to decrypt or restore any of those files. You need a proper decryption tool. There are some options for this threat family, but solutions are still limited.

Nevertheless, there cannot be any decryption or file recovery using data repair software or backups until the malware is present. The system requires proper cleaning with software like SpyHunter 5Combo Cleaner or Malwarebytes, so the detection[2] engines can indicate malicious files and terminate them.

Then another important step is file recovery in system folders. It can be crucial in virus removal and file repair functions since Lssr might disable some applications and alter settings to further control the infected machine. Once you do these things, you will be able to calm down and relax while being sure that no harm was done to your devices. Only then can data recovery be considered.

Lssr file virusThe virus is focused on ransom demands can be removed with AV tools

Once a computer is infected with malware, its system is changed to operate differently. For example, an infection can alter the Windows registry database, damage vital bootup and other sections, delete or corrupt DLL files, etc. Once a system file is damaged by malware, antivirus software cannot do anything about it, leaving it just the way it is. Consequently, users might experience performance, stability, and usability issues, to the point where a full Windows reinstallation is required.

Therefore, we highly recommend using a one-of-a-kind, patented technology of FortectIntego repair. Not only can it fix virus damage after the infection, but it is also capable of removing malware that has already broken into the system thanks to several engines used by the program. Besides, the application can also fix various Windows-related issues that are not caused by malware infections, such as Blue Screen errors, freezes, registry errors, damaged DLLs, etc.

  • Download the application by clicking on the link above
  • Click on the ReimageRepair.exe
    Reimage download
  • If User Account Control (UAC) shows up, select Yes
  • Press Install and wait till the program finishes the installation processReimage installation
  • The analysis of your machine will begin immediatelyReimage scan
  • Once complete, check the results – they will be listed in the Summary
  • You can now click on each of the issues and fix them manually
  • If you see many problems that you find difficult to fix, we recommend you automatically purchase the license and fix them.Reimage results

By employing FortectIntego, you would not have to worry about future computer issues, as most of them could be fixed quickly by performing a full system scan at any time. Most importantly, you could avoid the tedious process of Windows reinstallation in case things go very wrong due to one reason or another.

If you have infected your computer with one of the Djvu variants, you should try using Emsisoft decryptor for Djvu/STOP. It is important to mention that this tool will not work for everyone – it only works if data was locked with an offline ID due to malware failing to communicate with its remote servers.

In most cases, these newer versions, like Lssr virus, rely on an online key forming technique. Hence, each victim of the threat receives unique identification and needs to get the particularly matching decryption key, so files can be restored properly. It is not that possible without paying, so any victim of the advanced version faces data losses when backups are not updated, and other options fail to help.

Even if your case meets this condition, somebody from the victims has to pay criminals, retrieve an offline key, and then share it with security researchers at Emsisoft. As a result, you might not be able to restore the encrypted files immediately. Thus, if the decryptor says your data was locked with an offline ID but cannot be recovered currently, you should try later. You also need to upload a set of files – one encrypted and a healthy one to the company's servers before you proceed.

  • Download the app from the official Emsisoft website.Lssr ransomware
  • After pressing the Download button, a small pop-up at the bottom, titled decrypt_STOPDjvu.exe should show up – click it.
    Lssr ransomware
  • If User Account Control (UAC) message shows up, press Yes.
  • Agree to License Terms by pressing Yes.
    Lssr ransomware
  • After Disclaimer shows up, press OK.
  • The tool should automatically populate the affected folders, although you can also do it by pressing Add folder at the bottom.
    Lssr ransomware
  • Press Decrypt.
    Lssr ransomware

From here, there are three available outcomes:

  1. Decrypted!” will be shown under files that were decrypted successfully – they are now usable again.
  2. Error: Unable to decrypt a file with ID:” means that the keys for this version of the virus have not yet been retrieved, so you should try later.
  3. This ID appears to be an online ID; decryption is impossible” – you are unable to decrypt files with this tool.

The latest variants of the Lssr file virus are impossible to decode thanks to an offline ID vs. online ID encryption process, which allows for recovery of files from previous versions but not this one because it's more advanced and encoding data is done with a different set of keys that have no easy way to be recovered by external means like keyloggers or backups. You can store files related to threats and wait for the additional decryption option, but such things take time.

The Lssr virus is another type of malware that targets not only the OS itself but also uses brute force attacks to try to infect other devices like smartphones (through Bluetooth), smartwatches, and other connected IoT-like devices because it can share information with your Android smartphone or Apple watch.[3]

The infection rate for this particular variant was pretty high when first released, which means that there are probably thousands of users. This malware also attempts to connect to a server via a command-and-control server as it sets about looking for specific file types on your system. It can steal some valuable data and later on target victims or blackmail them.

On the Internet, we are constantly exposed to different threats and viruses. These risks can result in additional infiltration of our devices; that is why it's important not only to install a virus detector but also to be aware of how they work—another important fact – the importance of file backups. Without them, your files cannot be recovered once encrypted.

Alternate option – data recovery software

Since many users do not prepare proper data backups prior to being attacked by ransomware, they might often lose access to their files permanently. Paying criminals is also very risky, as they might not fulfill the promises and never send back the required decryption tool. Lssr ransomware is created by malicious actors that shouldn't be trusted.

While this might sound terrible, not all is lost – data recovery software might be able to help you in some situations (it highly depends on the encryption algorithm used, whether ransomware managed to complete the programmed tasks, etc.). Since there are thousands of different ransomware strains, it is immediately impossible to tell whether third-party software will work for you.

Therefore, we suggest trying regardless of which ransomware attacked your computer. Before you begin, several pointers are important while dealing with this situation:

  • Since the encrypted data on your computer might permanently be damaged by security or data recovery software, you should first make backups of it – use a USB flash drive or another storage.
  • Only attempt to recover your files using this method after you perform a scan with anti-malware software.

Install data recovery software

  1. Download Data Recovery Pro.
  2. Double-click the installer to launch it.
    Lssr ransomware
  3. Follow on-screen instructions to install the software.Install program
  4. As soon as you press Finish, you can use the app.
  5. Select Everything or pick individual folders where you want the files to be recovered from.Select what to recover
  6. Press Next.
  7. At the bottom, enable Deep scan and pick which Disks you want to be scanned.Select Deep scan
  8. Press Scan and wait till it is complete.Scan
  9. You can now pick which folders/files to recover – don't forget you also have the option to search by the file name!
  10. Press Recover to retrieve your files.Recover files

The first thing you should do if this happens is to remove all external USB ports from your device so any malicious files cannot infect other computers through these connections. One of the most common ways for cyber-criminals is to send a text message with a shortened link to their victim, redirecting them to legitimate sites.

Unfortunately, these are nothing more than misleading websites that try to trick people into downloading malicious applications. If you click on an attachment or enter your login data, you will install dangerous malware and expose yourself to identity theft or ransomware attacks. Lssr virus payload can end up launched immediately after the infiltration.

You need to have proper system security tools like SpyHunter 5Combo Cleaner pr Malwarebytes running, so anything like this would not happen. Also, your machine is kept virus-free when these malicious pieces get blocked before infiltrating. It is crucial when it comes to these file-encrypting infections because you may suffer from permanent money and file loss.

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Compatible with Microsoft Windows Compatible with macOS
What to do if failed?
If you failed to fix virus damage using Fortect Intego, submit a question to our support team and provide as much details as possible.
Fortect Intego has a free limited scanner. Fortect Intego offers more through scan when you purchase its full version. When free scanner detects issues, you can fix them using free manual repairs or you can decide to purchase the full version in order to fix them automatically.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Fortect, try running SpyHunter 5.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Intego, try running Combo Cleaner.

How to prevent from getting ransomware

Stream videos without limitations, no matter where you are

There are multiple parties that could find out almost anything about you by checking your online activity. While this is highly unlikely, advertisers and tech companies are constantly tracking you online. The first step to privacy should be a secure browser that focuses on tracker reduction to a minimum.

Even if you employ a secure browser, you will not be able to access websites that are restricted due to local government laws or other reasons. In other words, you may not be able to stream Disney+ or US-based Netflix in some countries. To bypass these restrictions, you can employ a powerful Private Internet Access VPN, which provides dedicated servers for torrenting and streaming, not slowing you down in the process.

Data backups are important – recover your lost files

Ransomware is one of the biggest threats to personal data. Once it is executed on a machine, it launches a sophisticated encryption algorithm that locks all your files, although it does not destroy them. The most common misconception is that anti-malware software can return files to their previous states. This is not true, however, and data remains locked after the malicious payload is deleted.

While regular data backups are the only secure method to recover your files after a ransomware attack, tools such as Data Recovery Pro can also be effective and restore at least some of your lost data.

About the author
Olivia Morelli
Olivia Morelli - Ransomware analyst

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