What is Lssr Ransomware

STOP Ransomware is a sophisticated encryption virus, that uses the Salsa20 algorithm to encode sensitive personal data, such as photos, videos, and documents. The latest version (Lssr Ransomware), appeared in July 2021, adds .lssr extension to files and makes them unreadable. To date, the family includes about 315 representatives, and the total number of affected users is approaching a million. Most of the attacks are in Europe and South America, India, and Southeast Asia. The threat also affected the United States, Australia, and South Africa. Although the Lssr virus is less known than GandCrab, Dharma, and other ransomware trojans, it is this year that accounts for more than half of the detected attacks. Moreover, the next rating participant, the aforementioned Dharma, lags behind him by this indicator by more than four times. A significant role in the prevalence of STOP Ransomware is played by its diversity: in the most active periods, experts found three or four new versions daily, each of which hit several thousand victims. The ransom note file (_readme.txt), created by the threat is represented below:

STOP Ransomware (.lssr extensions)
ATTENTION!
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:
hxxps://we.tl/t-mNr1oio2P6
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:
manager@mailtemp.ch
Reserve e-mail address to contact us:
helpmanager@airmail.cc
Your personal ID:
{random-44-character-alphanumeric-id}

The virus uses similar patterns in all versions: it encrypts files, adds a new extension to them, and places a ransom note on the infected machine (it requires $490, but if not paid within 72 hours amount doubles to $980). Emsisoft experts, together with ransomware expert Michael Gillespie, have released a free STOP Djvu Decryptor (currently released and updated solely by Emsisoft). The development, created by Gillespie and Emsisoft specialists, uses a characteristic feature in the work of Lssr – the malware creates an encryption key based on the first five bytes of the affected object. This allows experts to recreate the key using the source file. In addition, for some files, the code starts from the same sections – for example, Microsoft Office documents coincide with ZIP archives in this. As a result, the decryption of one object allows you to work with other formats. To use the descriptor, the user needs to train the program – download the same document in encrypted and original form through the online interface. Such pairs need to be selected for each file format that needs to be restored. Trained in this way, the utility will then be able to decrypt all objects of the corresponding formats. Stellar Data Recovery Professional is one of the best file-recovery tools and, if used properly, may recover copies and duplicates of encrypted files, that were removed prior to infection. The only option for successful 100% recovery is existing backups. The article below explains how to remove Lssr Ransomware correctly and decrypt .lssr files for free.

lssr ransomware

  1. Download Lssr Ransomware Removal Tool
  2. Get decryption tool for .lssr files
  3. Recover encrypted files with Stellar Data Recovery Professional
  4. Restore encrypted files with Windows Previous Versions
  5. Restore files with Shadow Explorer
  6. How to protect from threats like Lssr Ransomware

Virus modifies “hosts” file to block Windows updates, downloading antivirus programs, and visiting sites related to security news or offering security solutions. Lssr Ransomware comes along with AZORult trojan, which was initially created to steal logins and passwords. The process of infection also looks like installing Windows updates, the malware shows a fake window, that mimics the update process.

fake windows update from Lssr Ransomware

It uses rdpclip.exe to replace a legal Windows file and to launch an attack on a computer network. After encrypting the files, the encrypter is deleted using the delself.bat command file. Lssr Ransomware virus is propagated via spam attack with malicious e-mail attachments and using manual PC hacking. Can be distributed by hacking through an unprotected RDP configuration, fraudulent downloads, exploits, web injections, fake updates, repackaged, and infected installers. The virus assigns a certain ID to the victims, which is used to name those files and supposedly to send a decryption key. Great tools to protect against Lssr Ransomware are: Emsisoft Anti-Malware and Malwarebytes Anti-Malware.

Download Lssr Ransomware Removal Tool

Download Removal Tool

To remove Lssr Ransomware completely, we recommend you to use WiperSoft AntiSpyware from WiperSoft. It detects and removes all files, folders, and registry keys of Lssr Ransomware and prevents future infections by similar viruses.

Alternative Removal Tool

Download SpyHunter 5

To remove Lssr Ransomware completely, we recommend you to use SpyHunter 5 from EnigmaSoft Limited. It detects and removes all files, folders, and registry keys of Lssr Ransomware. The trial version of SpyHunter 5 offers virus scan and 1-time removal for FREE.

How to remove Lssr Ransomware manually

It is not recommended to remove Lssr Ransomware manually, for safer solution use Removal Tools instead.

Lssr Ransomware files:

_readme.txt
rdpclip.exe
delself.bat
{randomname}.exe

Lssr Ransomware registry keys:

no information

How to decrypt and restore .lssr files

Use automated decryptors

Download STOP Djvu Decryptor from EmsiSoft (.lssr variations)

IMPORTANT: Read this detailed guide on using STOP Djvu Decryptor to avoid file corruption and time wasting.

STOP djvu ransomware decryptor from emsisoft

STOP Djvu Decryptor is able to decrypt .lssr files, encrypted by Lssr Ransomware. This tool was developed by EmsiSoft. It works in automatic mode, but in most cases works only for files encrypted with offline keys. Download it here:

Download STOP Djvu Decryptor

Dr.Web Rescue Pack

Famous antivirus vendor Dr. Web provides free decryption service for the owners of its products: Dr.Web Security Space or Dr.Web Enterprise Security Suite. Other users can ask for help in the decryption of .lssr files by uploading samples to Dr. Web Ransomware Decryption Service. Analysis of files will be performed free of charge and if files are decryptable, all you need to do is purchase a 2-year license of Dr.Web Security Space worth $120 or less. Otherwise, you don’t have to pay.

If you are infected with Lssr Ransomware and removed it from your computer, you can try decrypting your files. Antivirus vendors and individuals create free decryptors for some crypto-lockers. To attempt to decrypt them manually you can do the following:

Use Stellar Data Recovery Professional to restore .lssr files

stellar data recovery professional

  1. Download Stellar Data Recovery Professional.
  2. Click Recover Data button.
  3. Select type of files you want to restore and click Next button.
  4. Choose location where you would like to restore files from and click Scan button.
  5. Preview found files, choose ones you will restore and click Recover.
Download Stellar Data Recovery Professional

Using Windows Previous Versions option:

  1. Right-click on infected file and choose Properties.
  2. Select Previous Versions tab.
  3. Choose particular version of the file and click Copy.
  4. To restore the selected file and replace the existing one, click on the Restore button.
  5. In case there is no items in the list choose alternative method.

Using Shadow Explorer:

  1. Download Shadow Explorer program.
  2. Run it and you will see screen listing of all the drives and the dates that shadow copy was created.
  3. Select the drive and date that you want to restore from.
  4. Right-click on a folder name and select Export.
  5. In case there are no other dates in the list, choose alternative method.

If you are using Dropbox:

  1. Login to the DropBox website and go to the folder that contains encrypted files.
  2. Right-click on the encrypted file and select Previous Versions.
  3. Select the version of the file you wish to restore and click on the Restore button.

How to protect computer from viruses, like Lssr Ransomware, in future

1. Get special anti-ransomware software

Use BitDefender Anti-Ransomware

bitdefender anti-ransomware

Famous antivirus vendor BitDefender released a free tool, that will help you with active anti-ransomware protection, as an additional shield to your current protection. It will not conflict with bigger security applications. If you are searching complete internet security solution consider upgrading to full version of BitDefender Internet Security 2018.

Download BitDefender Anti-Ransomware

2. Back up your files

idrive backup

As an additional way to save your files, we recommend online backup. Local storage, such as hard drives, SSDs, flash drives, or remote network storage can be instantly infected by the virus once plugged in or connected to. Lssr Ransomware uses some techniques to exploit this. One of the best services and programs for easy automatic online backup is iDrive. It has the most profitable terms and a simple interface. You can read more about iDrive cloud backup and storage here.

3. Do not open spam e-mails and protect your mailbox

mailwasher pro

Malicious attachments to spam or phishing e-mails are the most popular method of ransomware distribution. Using spam filters and creating anti-spam rules is good practice. One of the world leaders in anti-spam protection is MailWasher Pro. It works with various desktop applications and provides a very high level of anti-spam protection.

Download MailWasher Pro
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