What is STOP Ransomware

Encryption specialist Michael Gillespie (USA) has managed to create his decoder for some versions and variants of STOP Ransomware, when the encryption tool uses an offline key for encryption. Tool is called STOPDecrypter and can be downloaded below.

STOP Ransomware (a.k.a. DJVU Ransomware) is wide-spread file-encrypting virus-extortionist. This is one of the most dangerous ransomware with high damaging effect and prevalence rate. It uses AES-256 encryption algorithm in CFB mode with zero IV and a single 32-byte key for all files. A maximum of 0x500000 bytes (~5 Mb) of data at the beginning of each file is encrypted. Virus appends .stone, .davda .lanset or .redmat extensions to encoded files. Infection affects important and valuable files. These are MS Office documents, OpenOffice, PDF, text files, databases, photos, music, video, image files, archives, application files, etc. DJVU Ransomware does not encrypt system files, to make sure Windows operates correctly and users are able to browse internet, visit payment page and pay the ransom. STOP Ransomware creates _readme.txt file, that is called “ransom note” and it contains instructions to make payment and contact details. Virus places it on the desktop and in the folders with encrypted files. Developers offer following contact details: stoneland@firemail.cc and gorentos@bitmessage.ch, or Telegram: @datarestore. Below is the example of such file:

STOP (.stone, .davda, .lanset or .redmat) Ransomware
ATTENTION!

Don't worry my friend, 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:
hxxps://we.tl/t-4Orti6OnRT
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:
stoneland@firemail.cc

Reserve e-mail address to contact us:
gorentos@bitmessage.ch

Our Telegram account:
@datarestore

Your personal ID:
{random-44-character-alphanumeric-id}

Hackers extort $980 in exchange for decryption of your files (victims supposedly get 50% discount, if they contact cyber criminals within 72 hours after the encryption). In our experience dealing with malefactors, often they don’t reply to victims, after getting the ransom. There is no point in paying them, because files encrypted by some versions of STOP (DJVU) Ransomware can be decrypted with help of free STOPDecrypter. Before initiating file decryption, you need to stop malicious process and remove STOP Ransomware. This page contains precise instructions to remove STOP (DJVU) Ransomware and decrypt .stone, .davda, .lanset or .redmat files in Windows 10, Windows 8 and Windows 7.

stop ransomware (.stone, .davda, .lanset or .redmat extensions)

How STOP Ransomware infected your PC

Virus modifies “hosts” file to block Windows updates, downloading antivirus programs, and visiting sites related to security news or offering security solutions. The process of infection also looks like installing of Windows updates, malware shows fake window, that mimics update process. 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. STOP 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. Virus assigns certain ID with the victims, that is used to name those files and supposedly to send decryption key. Great tools to protect against Stone or Redmat Ransomware are: Emsisoft Anti-Malware and Malwarebytes Anti-Malware.

Download STOP Ransomware Removal Tool

Download Removal Tool

To remove STOP Ransomware completely, we recommend you to use WiperSoft AntiSpyware from WiperSoft. It detects and removes all files, folders and registry keys of STOP Ransomware.

How to remove STOP Ransomware manually

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

STOP Ransomware files:


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

STOP Ransomware registry keys:

no information

How to decrypt and restore .stone, .davda, .lanset or .redmat files

Use automated decryptors

Download STOPDecrypter (.stone, .davda, .lanset or .redmat variations)

stop ransomware decrypter

STOPDecrypter is able to decrypt .stone, .davda, .lanset or .redmat files, encrypted by STOP Ransomware. This tool was developed by Michael Gillespie. It requires encrypted and original file pair with the size more ~150 Kb and works only for those encrypted with offline keys. Download it here:

Download STOPDecrypter

If you are infected with STOP 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 .stone, .davda, .lanset or .redmat 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 STOP Ransomware in future

1. Get special anti-ransomware software

Use BitDefender Anti-Ransomware

bitdefender anti-ransomware

Famous antivirus vendor BitDefender released free tool, that will help you with active anti-ransomware protection, as 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

onedrive backup

Regardless of success of protection against ransomware threats, you can save your files using simple online backup. Cloud services are quite fast and cheap nowadays. There is more sense using online backup, than creating physical drives, that can get infected and encrypted when connected to PC or get damaged from dropping or hitting. Windows 10 and 8/8.1 users can find pre-installed OneDrive backup solution from Microsoft. It is actually one of the best backup services on the market, and has reasonable pricing plans. Users of earlier versions can get acquainted with it here. Make sure to backup and sync most important files and folders in OneDrive.

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

spamfighter

Malicious attachments to spam or phishing e-mails is 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 SpamFighter. It works with various desktop applications, and provides very high level of anti-spam protection.

Download SPAMFighter 5/5 (3)

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