Tasa virus is a ransomware that belongs to STOP/Djvu family. Main functionality of this malware is data encryption, which makes it impossible to use the files. Upon execution, Tasa ransomware searches the disks in the system for videos, photos, documents etc., and encrypts all the matches. You can distinguish the resulting files by .tasa extensions at the end. These files are not accessible without the decryption operation.
Tasa Virus Overview
Tasa
🤔 Tasa virus belongs to ransomware that originates from the DJVU/STOP ransomware family. Its main target is to cipher all of your files it can reach. After that this ransomware asks for a ransom payment – ($490 – $980) in Bitcoin.
The Tasa virus is a malicious program that encrypts your files and makes you pay for their restoration. This malware encrypts different file types. ciphered files can be identified by a distinct “.tasa” extension. The files touched by ransomware become inaccessible and unusable.
Then, the ransomware asks for a ransom payment in Bitcoin from its victims, that ranges from $490 to $980, depending on the time passed after the attack. In all cases, a text file with ransom payment guidances is named as “_readme.txt“.
Tasa Ransomware uses Salsa20 encryption algorithms to cipher the files. Since Tasa virus uses such a robust encryption method, it becomes pretty difficult, if even possible, to pick the decryption key without cooperating with the attackers.
Once Tasa malware finishes the encryption, it shows a ransom note to the victim, asking for a ransom payment in exchange for the decryption key. The ransom note provides instructions on how to pay off the bill and often includes threats of data loss or ransom amounts surge if the ransom is not paid within a specified timeframe.
I have created an all-encompassing list of the solutions, advice, and practices to stop the Tasa virus and recover access to your files. There are cases when it may be possible to restore your files, but sometimes, it may be impossible.
📌 Important Note!
It is important to say that paying off the bill is not a guarantee of the successful recovery of your files. The cybercriminals behind the Tasa virus are not trustworthy. There were the cases where victims have paid the ransom, only to be denied by the cybercriminals with the decryption key provision.
Tasa employs a unique key for each victim, with one exception:
- If Tasa fails to connect the command and control server (C2) before starting the encryption process, it resorts to using offline keys. This key is the same for all users, which allows for the decryption of files encrypted by the ransomware.
The Tasa virus bears resemblance to other DJVU ransomware variants such as Jaqw, Jasa, Jaoy, Yytw, Yyza, Popn, and Poaz. This virus encrypts a wide range of common file types and appends its distinct “.tasa” extension to all files. For instance, a file named “1.jpg” would be altered to “1.jpg.tasa” and “2.png” to “2.png.tasa“.
After successful encryption, malware spawns a special text file named “_readme.txt” and places it in every folder containing the encrypted files. It as well adds this file to the desktop, so the victim will not miss its appearance even without opening folders.
The image below provides a visual representation of files with the “tasa” extension:
Encrypted Files by STOP/DJVU Ransomware
| Name | Tasa Virus |
| Ransomware family1 | DJVU/STOP2 ransomware |
| Extension | .tasa |
| Ransomware note | _readme.txt |
| Ransom | From $490 to $980 (in Bitcoins) |
| Contact | support@fishmail.top, datarestorehelp@airmail.cc |
| Detection | VirTool:Win32/CeeInject!KC, Trojan-Ransom.Win32.Blocker.ikgf, Win32/Filecoder.Spacecolon.A |
| Symptoms |
|
| Fix Tool | To remove possible malware infections, scan your PC: 6-day free trial available. |
This message asking payment is for restore files via decryption key:
_readme.txt (STOP/DJVU Ransomware) – The scary notification demanding users to pay the ransom to decrypt the encrypted data contains these exasperating cautions.
Tasa ransomware arrives as a set of procedures that are meant to execute certain tasks on a victim’s computer. One of the first ones being launched is winupdate.exe, a sneaky process that displays a fraudulent Windows update notification during the attack. This is meant to convince the victim that their PC has become slow because of a Windows update.
Meanwhile, the ransomware runs another process (named as 4 random chars) which initiates scanning the system for target files and ciphering them. Then the ransomware removes Volume Shadow Copies from the disk through the following CMD command:
vssadmin.exe Delete Shadows /All /Quiet
Once erased, it becomes impossible to retrieve the previous computer state using System Restore Points. The concern is, ransomware operators are eliminating any built-in Windows approaches that could aid the victim to restore files for free. In addition, the rascals modify the Windows HOSTS file by adding a list of domains to it and redirecting them to the localhost IP. As a result, the victim will face a DNS_PROBE_FINISHED_NXDOMAIN error when trying to open one of the listed websites.
It has come to our attention that ransomware attempts to block websites that post various how-to guides for computer users. It is evident that by limiting specific domains, the malefactors are seeking to hinder the victim from reaching relevant and helpful ransomware-attack-related information online. This malware also keeps two text files on the victim’s computer that present particulars related to the attack – the victim’s public key and personal ID. These two files are named bowsakkdestx.txt and PersonalID.txt.
After all these modifications, the malware doesn’t cease. Variants of STOP/DJVU have a tendency to install Vidar password-stealing Trojan on compromised systems. This threat has an large list of capabilities, including:
- Stealing Steam, Telegram, Skype login / password;
- Stealing cryptocurrency wallets;
- Downloading other malware to the computer and running it;
- Stealing browser cookies, saved passwords, browsing history, and more;
- Viewing and manipulating files on victim’s computer;
- Allowing the hackers to perform other tasks on the victim’s computer remotely.
The encryption algorithm used by DJVU/STOP virus is AES-256. So, once your data is encrypted with an online decryption key, the chances to get your files back are quite low. Thing is, this key is unique for each victim, and brute forcing it will take exceptionally big amount of time.
Obtaining the online decryption key in another way is also merely impossible. It is stored on a command server owned by the hackers who promote the Tasa malware. For receiving decryption key the payment should be $980. To obtain the payment details, the victims should contact the fraudsters by email (support@fishmail.top).
The message by the ransomware states the following information:
ATTENTION! Don't worry, 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: https://we.tl/t-WJa63R98Ku 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: support@fishmail.top Reserve e-mail address to contact us: datarestorehelp@airmail.cc Your personal ID: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Do not pay the ransom!
Please, try to use the available backups, or Decrypter tool
The _readme.txt file also requests that the system owner must get in touch with the hackers within 72 hours after the attack. If the 72hrs demand is met, hackers grant a 50% off. This decreases the ransom sum down to $490.
Yet, stay away from paying the ransom! I highly recommend that you do not contact these scammers and do not pay. An efficient solution to regain the lost data is just using the backups you have, or using Decrypter tool from Emsisoft.
The uniqueness of all such viruses is the application a similar set of actions to generate the unique decryption key. Thus, unless the ransomware is still in development or exhibits some hard-to-track encryption, manual data recovery is a thing you can’t perform. The only solution to prevent the loss of your valuable data is to regularly make backups of your crucial files.
Note that even if you do preserve such backups regularly, they must be stored into a specific location without loitering, not being connected to your main workstation. For instance, the backup may be kept on the USB flash drive or some optional external hard drive storage. Optionally, you may rely to the help of online (cloud) information storage.
Needless to say, when you store your backup on your regular device, it may be ciphered together with other data. For this reason, placing the backup on your computer’s disk is surely not a wise idea.
How I was infected?
Ransomware has a various methods to built into your system. But it doesn’t really matter what way had place in your case.
Ransomware attack following a successful phishing attempt.
- Using online free hosting resources as a means to distribute the virus undetected.
- Disguising the virus installer alongside various apps, particularly those offered as freeware or shareware.
- Spreading the virus through spam emails containing deceptive links that lead to its installation.
- Obtaining pirated software from illegal peer-to-peer (P2P) resources, exposing users to potential malware threats.
Instances have been reported when the Tasa virus hiding as a legit procedure, for example, the messages asking to run a browser update or a vastly needed codec for online media playback. This is usually the way how some online deceptions aim to force you into installing the ransomware manually, by actually making you directly involve in this process.
Surely, the fake update alert will not indicate that you are going to actually install the virus. This installation will be hidden under some alert stating that you need to install an urgent security update or some questionable program whatsoever.
Without a doubt, the software cracks represent the harm as well. Using P2P is illegal and may result in the introduction of severe malware, including the Tasa ransomware.
To sum up, what can you do to avoid the penetration of the ransomware into your computer? Even though there is no 100% assurance to stop your PC from getting compromised, there are some tips I want to give you to shield the Tasa penetration. You must be cautious while installing free software today.
Ensure you always read what the installer offers aside from the main free program. Keep away from launching questionable email attachments. Do not open files from the unknown recipients. Certainly, your current security program must always be updated.
The malware does not states openly about itself. It will not appear in the list of your available programs. However, it will be masked under some malevolent process running regularly in the background, starting from the moment when you boot up your computer.
How To Remove Ransomware?
Remove Tasa Virus with Gridinsoft Anti-Malware
We have also been using this software on our systems ever since, and it has always been successful in detecting viruses. It has blocked the most common Ransomware as shown from our tests with the software, and we assure you that it can remove Tasa Virus as well as other malware hiding on your computer.
To use Gridinsoft for remove malicious threats, follow the steps below:
1. Begin by downloading Gridinsoft Anti-Malware, accessible via the blue button below or directly from the official website gridinsoft.com.
2.Once the Gridinsoft setup file (setup-gridinsoft-fix.exe) is downloaded, execute it by clicking on the file.
3.Follow the installation setup wizard's instructions diligently.
4. Access the "Scan Tab" on the application's start screen and launch a comprehensive "Full Scan" to examine your entire computer. This inclusive scan encompasses the memory, startup items, the registry, services, drivers, and all files, ensuring that it detects malware hidden in all possible locations.
Be patient, as the scan duration depends on the number of files and your computer's hardware capabilities. Use this time to relax or attend to other tasks.
5. Upon completion, Anti-Malware will present a detailed report containing all the detected malicious items and threats on your PC.
6. Select all the identified items from the report and confidently click the "Clean Now" button. This action will safely remove the malicious files from your computer, transferring them to the secure quarantine zone of the anti-malware program to prevent any further harmful actions.
8. If prompted, restart your computer to finalize the full system scan procedure. This step is crucial to ensure thorough removal of any remaining threats. After the restart, Gridinsoft Anti-Malware will open and display a message confirming the completion of the scan.
Remember Gridinsoft offers a 6-day free trial. This means you can take advantage of the trial period at no cost to experience the full benefits of the software and prevent any future malware infections on your system. Embrace this opportunity to fortify your computer's security without any financial commitment.
Trojan Killer for “Tasa Virus” removal on locked PC
In situations where it becomes impossible to download antivirus applications directly onto the infected computer due to malware blocking access to websites, an alternative solution is to utilize the Trojan Killer application.
There is a really little number of security tools that are able to be set up on the USB drives, and antiviruses that can do so in most cases require to obtain quite an expensive license. For this instance, I can recommend you to use another solution of GridinSoft - Trojan Killer Portable. It has a 14-days cost-free trial mode that offers the entire features of the paid version. This term will definitely be 100% enough to wipe malware out.
Trojan Killer is a valuable tool in your cybersecurity arsenal, helping you to effectively remove malware from infected computers. Now, we will walk you through the process of using Trojan Killer from a USB flash drive to scan and remove malware on an infected PC. Remember, always obtain permission to scan and remove malware from a computer that you do not own.
Step 1: Download & Install Trojan Killer on a Clean Computer:
1. Go to the official GridinSoft website (gridinsoft.com) and download Trojan Killer to a computer that is not infected.
2. Insert a USB flash drive into this computer.
3. Install Trojan Killer to the "removable drive" following the on-screen instructions.
4. Once the installation is complete, launch Trojan Killer.
Step 2: Update Signature Databases:
5. After launching Trojan Killer, ensure that your computer is connected to the Internet.
6. Click "Update" icon to download the latest signature databases, which will ensure the tool can detect the most recent threats.
Step 3: Scan the Infected PC:
7. Safely eject the USB flash drive from the clean computer.
8. Boot the infected computer to the Safe Mode.
9. Insert the USB flash drive.
10. Run tk.exe
11. Once the program is open, click on "Full Scan" to begin the malware scanning process.
Step 4: Remove Found Threats:
12. After the scan is complete, Trojan Killer will display a list of detected threats.
13. Click on "Cure PC!" to remove the identified malware from the infected PC.
14. Follow any additional on-screen prompts to complete the removal process.
Step 5: Restart Your Computer:
15. Once the threats are removed, click on "Restart PC" to reboot your computer.
16. Remove the USB flash drive from the infected computer.
Congratulations on effectively removing Tasa Virus and the concealed threats from your computer! You can now have peace of mind, knowing that they won't resurface again. Thanks to Gridinsoft's capabilities and commitment to cybersecurity, your system is now protected.
Video Guide
How To Decrypt .tasa Files?
How to restore big files?
Try removing .tasa extension on a few big files and opening them. This malware has issues with large files encryption. Either the virus read and did not encrypt the file, or it failed and did not add the filemarker. If you have files that are very large (2GB+), the latter is most likely. Please, let me know in comments if that will work for you.
The newest extensions released around the end of August 2019 after the criminals made changes. This includes Yytw, Yyza, Popn etc.
As a outcome of the changes made by the criminals, STOPDecrypter is no longer assisted. It has been replaced with the Emsisoft Decryptor for STOP Djvu Ransomware developed by Emsisoft.
You can download free decryption tool here: Decryptor for STOP Djvu.
Download and run decryption tool.
Start downloading the decryption tool.
Make sure to launch the decryption utility as an administrator. You need to agree with the license terms that will come up. For this purpose, click on the “Yes” button:
As soon as you accept the license terms, the main decryptor user interface comes up:
Select folders for decryption.
Based on the default configurations, the decryptor will by default choose the reachable directories in order to decrypt the currently reachable drives (the connected ones), including the network drives. You can choose extra locations with the “Add” button.
Decryptors typically offer several options depending on the specific malware family. The existing possible options are presented in the Options tab and can be activated or turned off there. You may discover a detailed list of the currently active Options below.
Click on the “Decrypt” button.
As soon as you add all the desired locations for decryption into the list, click on the “Decrypt” button in order to initiate the decryption procedure.
Note that the main screen may turn you to a status view, letting you know of the active process and the decryption statistics of your data:
The decryptor will notify you as soon as the decryption procedure is completed. If you need the report for your personal papers, you can save it by choosing the “Save log” button. Note that it is also possible to copy it directly to your clipboard and to paste it into emails or messages here if you need to do so.
The Emsisoft Decryptor might display different messages after a failed attempt to restore your files:
✓ Error: Unable to decrypt file with ID: [your ID]
✓ No key for New Variant online ID: [your ID]
Notice: this ID appears to be an online ID, decryption is impossible
✓ Result: No key for new variant offline ID: [example ID]
This ID appears be an offline ID. Decryption may be possible in the future.
It can take a few weeks or months until the decryption key gets found and uploaded to the decryptor. Please follow updates regarding the decryptable DJVU versions here.
✓ Remote name could not be resolved
How to Restore .tasa Files?
In some case ransomware is not doom for your files…
The Tasa ransomware encryption mechanism feature is next: it encodes every file byte-by-byte, then saves a duplicate, removing (not overriding!) the initial file. Thus, the data of the file location on the disk drive is lost, but the original file is not deleted from the disk. The cell, or the sector where this file was stored, can still contain this file, but it is not listed by the file system and can be replaced by data that has been loaded to this drive after the removal. Hence, it is possible to retrieve your files using special software.
Anyway, after realizing it was an online algorithm, it is impossible to retrieve my encrypted files. I also had my backup drive plugged in at the time of the virus, and this was also infected, or so I thought. Every folder within my backup drive had been infected and was encrypted. However, despite losing some important files, I retrieved almost 80% of my 2TB storage.
When I started going through the folders, I noticed the readme.txt ransom note in every folder. I opened some of the folders and found that all files that were not in a subfolder within that folder had been encrypted. However, I found a flaw and glimmer of hope when I went into the subfolders in other folders and found that these files had not been encrypted. Every folder within my c and d drives, including subfolders, had been encrypted, but this was not the case with the backup drive. Having subfolders created within a folder has saved 80% of my data.
As I said, I believe this to be only a small loophole on a backup drive. I’ve since found a further 10 % of my data on another hard drive on a different pc. So my advice is if you use a backup drive, create subfolders. I was lucky, I guess. But I was also unlucky that the virus hit as I was transferring some files from my backup.
Hopefully, this can help some other people in my situation.
Jamie NewlandRecovering your files with PhotoRec
PhotoRec is an free program, which is originally created for files recovery from damaged disks, or for files recovery in case if they are unintentionally deleted. However, with time flow, this program got the ability to restore the files of 400 different extensions. Hence, it can be used for data recovery after the Tasa attack.
First, you need to download this app. It is 100% free, but the developer notifies that there is no assurance that your files will be restored. PhotoRec is spread together with other tool of the same developer – TestDisk. The resulting archive will have TestDisk name, but don’t worry. PhotoRec files are right inside.
To launch PhotoRec, you need to find and open “qphotorec_win.exe” file. No installation process is required – this program has all the files it need inside of the archive, hence, you can mount it on your USB drive, and try to help your friends/parents/anyone who has been attacked by Tasa ransomware.
After the launch, you will encounter the screen showing you the complete list of your disk spaces. However, this details are probably useless, because the required menu is placed a bit higher. Click this bar, then choose the disk which was attacked by ransomware.
After selecting the disk, you need to pick the destination folder for the recovered files. This menu is located at the lower part of the PhotoRec window. The best choice is to export them on USB drive or any other type of removable disk.
Then, you need to define the file formats. This option is located at the bottom, too. As it was mentioned, PhotoRec can regain the files of about 400 different formats.
Finally, you can initiate files retrieval by pressing the “Search” button. You will see the screen where the outcomes of the scan and recovery are shown.
Tasa files recovery Video Guide.
Frequently Asked Questions
No way. These files are encrypted by ransomware. The contents of encrypted files are not available until they are decrypted.
If your data remained in the .tasa files are very valuable, then most likely you made a backup copy.
If not, then you can try to restore them through the system function – Restore Point.
All other methods will require patience.
Of course not. Your encrypted files do not pose a threat to the computer. What happened has already happened.
You need GridinSoft Anti-Malware to remove active system infections. The virus that encrypted your files is most likely still active and periodically runs a test for the ability to encrypt even more files. Also, these viruses install keyloggers and backdoors for further malicious actions (for example, theft of passwords, credit cards) often.
In this situation, you need to prepare the memory stick with a pre-installed Trojan Killer.
Have patience. You are infected with the new version of STOP/DJVU ransomware, and decryption keys have not yet been released. Follow the news on our website.
We will keep you posted on when new keys or new decryption programs appear.
The Tasa ransomware encrypts only the first 150KB of files. So MP3 files are rather large, some media players (Winamp for example) may be able to play the files, but – the first 3-5 seconds (the encrypted portion) will be missing.
You can try to find a copy of an original file that was encrypted:
- Files you downloaded from the Internet that were encrypted and you can download again to get the original.
- Pictures that you shared with family and friends that they can just send back to you.
- Photos that you uploaded on social media or cloud services like Carbonite, OneDrive, iDrive, Google Drive, etc
- Attachments in emails you sent or received and saved.
- Files on an older computer, flash drive, external drive, camera memory card, or iPhone where you transferred data to the infected computer.
If the guide doesn’t help you to remove infection, please download the GridinSoft Anti-Malware that I recommended. Do not forget to share your experience in solving the problem. Please leave a comment here! This can help other victims to understand they are not alone. And together we will find ways to deal with this issue.
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Brendan SmithHow To Restore & Decrypt .TASA Files?
Name: TASA Ransomware
Description: The TASA Virus belongs to the STOP/DJVU family of ransomware infections. This malicious software encrypts various file types, including videos, photos, and documents, which become identifiable by a distinct tasa extension. As a result, the affected files become inaccessible and unusable. Subsequently, the TASA ransomware demands a ransom payment in Bitcoin from its victims, ranging from $490 to $980.
Operating System: Windows
Application Category: Virus
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