Troldesh ransomware removal instructions
What is Troldesh?
Troldesh is a family of ransomware-type viruses. Malware from this family is created using a 'development kit', which various affiliates utilize with their payment email addresses, and then distribute to infect as many computers as possible. After system infiltration, these viruses encrypt victims' files using an asymmetric encryption algorithm (for example, RSA-2048) and modify the filenames. For instance, if the original file copy was named filesample.jpg, it would be renamed to filesample.jpg.[VICTIM'S ID].[DEVELOPERS' EMAIL].xtbl. Never variants of this ransomware use .dexter and .crypted000007 extensions for encrypted files. These viruses also change the desktop wallpaper and create a number of text files (named, for example, How to decrypt your files.txt), placing them in each folder containing the encrypted files.
The text file and desktop wallpaper state that the victim must use the email address provided to restore compromised data. A reply is then received stating that the victim must pay a ransom to receive a decryption key. Payment instructions are also provided. This ransom must be paid in Bitcoins (BTC), and the size usually fluctuates between 0.5 and 1.5 BTC (at time of research, 1 BTC was equivalent to $538.06). Be aware, however, that cyber criminals often ignore victims, despite payments made. Therefore, you should never attempt to contact these criminals or pay any ransom. Two keys - public (encryption) and private (decryption) - are generated when encrypting files with the asymmetric algorithm. Decryption without the private key is impossible. Nevertheless, some ransomware has flaws and, therefore, you can try to restore your files using Rakhni Decryptor developed by the Kaspersky team (download link). Otherwise, you can only restore your files/system from a backup.
Screenshots of messages (desktop wallpapers) encouraging users to contact the developers of Troldesh ransomware to decrypt their compromised data:
Victims of this ransomware can try using ShadeDecryptor tool by Kaspersky to regain control of their compromised data. More info and download link HERE. Here’s a screenshot of ShadeDecryptor:
Currently-known email addresses used by developers of ransomware belonging to the Troldesh family:
Troldesh ransomware removal:
- What is Troldesh?
- STEP 1. Troldesh virus removal using safe mode with networking.
- STEP 2. Troldesh ransomware removal using System Restore.
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.
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.
Video showing how to start Windows 8 in "Safe Mode with Networking":
Log in to the account infected with the Troldesh 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.
2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.
3. Next, type this line: rstrui.exe and press ENTER.
4. In the opened window, click "Next".
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 Troldesh ransomware virus infiltrating your PC).
6. In the opened window, click "Yes".
7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining Troldesh 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 Troldesh 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.
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 protect your computer from file encrypting ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and Malwarebytes Anti-Ransomware, which artificially implant group policy objects into the registry to block rogue programs such as Troldesh ransomware.)
HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user intervention:
Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:
- 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 Troldesh ransomware: