How to remove Tisc virus

Tisc ransomware is a unique threat controlling processes on the system that can ensure persistence

Tisc ransomware is aiming to affect files as soon as it gets on the computer, so victims believe all the claims and pay the demanded sum. The virus belongs to a DJVU family of ransomware-type infections. This nasty malware will encrypt your files (video, photos documents) and makes them unopenable before marking files with an extension .tisc. All affected files on the machine or network receive the extension, so the user knows which pieces are encrypted.

In most cases, ransomware affects the most commonly used files, so there are few files left unencrypted. It uses strong encryption,^[1] so there isn’t much hope for the average person trying to crack these codes themselves. Official decryption solutions also are limited because researchers haven’t released the proper application yet. It takes a long time, so you can only rely on the existing program or third-party alternatives.

This encryption software locks up all sorts of data types such as images & videos, documents, and audio files. However, the Tisc virus can also damage the system data in directories, folders directly. The infection controls important startup processes and other parts of the machine to keep the malware running and affecting more aspects of the system.

If you cannot open your images, documents, or different files and they have a .tisc extension, it is the direct indication that your machine is infected by this threat. The virus runs on the computer for a while but can delete itself once files get locked. However, the code is still active and can encrypt any additionally added pieces. The virus will leave _readme.txt files in various folders. This is the message for victims with instructions on further actions. The file includes the text with claims and scary facts to get money for the alleged decrypting. People are encouraged to provide Bitcoin currency payments, so the files get restored.

The ransom note provides contact and payment information, so victims follow the suggestions and transfer payments quicker. It encourages victims to contact the attacker via manager@mailtemp.ch or managerhelper@airmail.cc email addresses within 72 hours from attack for a decryption tool. The alleged application costs between $490-$980, depending on how soon they want it done.

False claims encouraging users to pay though it is not recommended

Cybercriminals claim that they are able to provide free decryption of some test files, but caution should be exercised when trusting these people. This is the method to fake trust between Tisc virus makers and victims.

ATTENTION!

Don’t worry, you can return all your files!
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The only method of recovering files is to purchase decrypt tool and unique key for you.
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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.

Downloading any content from the email related to criminals can be dangerous due to the potential risks involved in handling unknown data! We do not recommend falling for these tricks at all. Experts^[2] also note that virus developers are the ones that distributed the threat with the purpose of getting money. Threat actors are not trustworthy, so do not even try to write them.

Removing the Tisc virus before attempting to decrypt files will prevent it from constantly encrypting them and keep your data safe. Remember that as long as ransomware is active, these malicious programs can inject files into the Windows operating system, which loads every time you start up a computer. It also alters various files to keep functions disabled. It also can damage the files like Shadow Volume copies needed for the alternate version of the data recovery.

The first thing to do is remove the Tisc virus before attempting any decryption because it will be impossible once encryption has progressed and even launched a second time. You can run a tool like SpyHunterCombo Cleaner or MalwarebytesMalwarebytes to check and remove any detected^[3] threats. This is the way to clear all infection pieces properly from your machine. Then you can safely move on to file restoring of your choice.

Offline vs. Online IDs determine if the decryption is possible

The latest versions of the Djvu ransomware released after August 2019 are designed to work exclusively with online IDs. The existing decryption tool is not very helpful because it only helps with older versions/ variants with offline keys. The virus connects with command and control servers to make unique keys, so if you want your data back, there’s no master key available anywhere, and criminals are the only ones who can restore that data. Meaning we’ll need an entirely different approach than before if we want our files restored!

There are few options for those unfortunate enough to get infected with Tisc ransomware. The virus is becoming more persistent, and developers have modified their encryption methods which makes the family of Djvu dangerous than ever before. It is not possible to decrypt files correctly without help from an outside party or technical expertise that can decode these pieces.

If you have 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 is locked with an offline ID due to malware failing to communicate with its remote servers.

Even if the Tisc virus 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.
• After pressing Download button, a small pop-up at the bottom, titled decrypt_STOPDjvu.exe should show up – click it.
• If User Account Control (UAC) message shows up, press Yes.
• Agree to License Terms by pressing Yes.
  
  
• 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.
  
• Press Decrypt.
  
  

System recovery after the infection

If you are looking to recover your encrypted data, remove ransomware first before that. We do understand that having your files locked by the Tisc threat is frustrating, but there are steps you need to take before adding any files to the PC. If the infection isn’t dealt with, it could come back again on the next boot of the system. When a cyber threat still remains inside the computer system, the device is not safe to use. It means that those files stored locally or on an external device can get affected, so remember this advice well!

Once a computer is infected with any threat, including the Tisc virus, the 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 is not capable of doing 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 is also capable of fixing various Windows-related issues that are not caused by malware infections, for example, Blue Screen errors, freezes, registry errors, damaged DLLs, etc.

• Download the application by clicking on the link above
• Click on the ReimageRepair.exe
  
• If User Account Control (UAC) shows up, select Yes
• Press Install and wait till the program finishes the installation process
• The analysis of your machine will begin immediately
• 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 purchase the license and fix them automatically.

Alternative for the decryption tool

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.

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.
3. Follow on-screen instructions to install the software.
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.
6. Press Next.
7. At the bottom, enable Deep scan and pick which Disks you want to be scanned.
8. Press Scan and wait till it is complete.
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.