Jasa virus is categorized as a ransomware strain associated with the STOP/DJVU family. Its primary purpose is to encrypt user files and demand a ransom. When the Jasa virus infects a system, it scans for a variety of file formats, particularly focusing on videos, photos, documents, or so. Subsequently, it employs a robust encryption algorithm to cipher these files, appending the .jasa extension to the compromised files.
Jasa Virus Overview
Jasa
🤔 Jasa virus is a part of STOP/Djvu ransomware family, that is active since 2019. This malware aims at ciphering your files, making them inaccessible without the decryption. Then, Jasa virus asks to pay a $490-$980 ransom in Bitcoin to get the decryption option.
The Jasa ransomware is a malicious program that encrypts your files and forces you to pay for their recovery. This malware ciphers a wide selection of file types. Ciphered files are identifiable by a distinct “.jasa” extension. As a result, the affected files become impossible to access and use.
After that, the ransomware demands a ransom payment in Bitcoin from the victims, ranging from $490 to $980. Typically, a text file with ransom payment guidances is named as “_readme.txt“.
Jasa Ransomware uses Salsa20 encryption algorithms to scramble the contents of the targeted files. Since Jasa virus employs such a robust ciphering method, it becomes quite hard, if even possible, to pick the decryption key without the assistance of the attackers.
Once Jasa malware finishes the encryption, it shows a ransom note to the user, demanding a ransom payment in exchange for the decryption key. The ransom note provides instructions on how to pay off the bill and also often includes threats of permanent data loss or ransom amounts surge if the ransom is not paid within a specified timeframe.
I have made a comprehensive list of potential solutions, advice, and methods to stop the Jasa malware and decrypt and recover your files. In some cases, you can decrypt the files, while sometimes, it may be impossible.
📌 Important Reminder!
It is essential to note that paying off the bill does not guarantee the successful files recovery. The cybercriminals behind the Jasa virus are known for their untrustworthiness. There were the cases where people have paid the ransom, only to be denied by the cybercriminals with the decryption key provision.
Jasa uses a unique key for each victim, with one exception:
- If Jasa fails to establish a connection with its command and control server (C&C Server) before starting the encryption process, it it uses offline keys. This key is the same for all users, allowing for the decryption of files encrypted by the ransomware.
The Jasa virus is similar to other DJVU ransomware variants like Jaoy, Taqw, Tasa, and Taoy. This virus encrypts a wide range of common file types and appends its distinct “.jasa” extension to all files. For instance, a file named “1.jpg” would be altered to “1.jpg.jasa” and “2.png” to “2.png.jasa“.
Upon successful encryption, the virus spawns a special text file named “_readme.txt” and places it in every folder containing the encrypted files. It as well adds the readme file to the desktop, so the user will not miss its appearance even without opening folders.
The image below provides a visual representation of files with the “jasa” extension:
Encrypted Files by STOP/DJVU Ransomware
| Name | Jasa Virus |
| Ransomware family1 | DJVU/STOP2 ransomware |
| Extension | .jasa |
| 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 frightening notification requesting users to pay off the ransom to unlock the encrypted data contains these exasperating admonitions.
The Jasa ransomware arrives on a victim’s computer as a set of tasks intended to carry out specific actions. One of the initial tasks it launches is winupdate.exe, which presents a fake Windows update alert during the attack. This action aims to convince the victim that a sudden PC slowdown occurs due to a Windows update.
Concurrently, the ransomware initiates another process (named with 4 random characters) that scans the PC for target files and encrypts them. Subsequently, the ransomware eliminates Volume Shadow Copies from the system disk using the following CMD command:
vssadmin.exe Delete Shadows /All /Quiet
Once deleted, restoring the previous computer state through System Restore Points becomes virtually impossible. The concern lies in the fact that ransomware operators are eliminating any built-in Windows methods that could assist victims in file recovery without payment. Additionally, the perpetrators modify the Windows HOSTS file by appending a list of domains and mapping them to the localhost IP. Consequently, when attempting to access one of the blocked websites, the victim encounters a DNS_PROBE_FINISHED_NXDOMAIN error.
We have noticed that the ransomware attempts to restrict websites that provide various how-to guides for computer users. Evidently, by limiting access to specific domains, the culprits aim to hinder victims from reaching relevant and helpful information about ransomware attacks online. The malware also deposits two .txt files on the victim’s computer containing attack-related details: the victim’s public key and personal ID. These files are named bowsakkdestx.txt and PersonalID.txt.
After all these alterations, the malware doesn’t cease. Variants of STOP/DJVU tend to deploy Vidar password-stealing Trojan on compromised systems. This threat carries an extensive list of capabilities, including:
- Manipulating and viewing files on the victim’s computer without their knowledge.
- Extracting sensitive information such as browser cookies, saved passwords, and browsing history.
- Obtaining unauthorized access to login credentials of Steam, Telegram, and Skype.
- Granting the hackers remote control over the victim’s computer for various malicious activities.
- Stealing cryptocurrency wallets from the victim’s system.
- Gathering sensitive data by running malicious software on the victim’s computer.
The cryptography algorithm in STOP/Djvu ransomware is AES-256. So, once your data is encrypted with an online decryption key, the possibility to get your files back without paying the ransom are quite low. Thing is, online key is unique for each victim, and picking it will take too much time.
Obtaining the online decryption key in another way is also merely impossible. It is kept on a server controlled by the hackers who spread the Jasa infection. For receiving unlocking key the payment should be $980. To see 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
_readme.txt file also states that the system user should contact the hackers within 72 hours starting from the moment of files were encrypted. On the condition of getting in touch within 72 hours, 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 to avoid contacting these frauds and do not pay. An efficient solution to retrieve the lost data is just using the available backups, or using Decrypter tool from Emsisoft.
The distinctiveness of such malware is the application a similar set of actions for generating the unique decryption key to recover the ciphered data. Thus, unless the ransomware is still in development or exhibits some hard-to-track encryption, manually recovering the ciphered data is a thing you can’t perform. The exclusive resolution to prevent the loss of your valuable data is to regularly make backups of your important files.
Keep in mind that even if you do preserve such backups regularly, they must be kept 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 substitute external hard drive storage. Optionally, you may turn to the help of online (cloud) information storage.
It goes without saying, when you keep your backup data on your regular device, it may be similarly ciphered as well as other data. For this reason, storing the backup on your main computer 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.
There were cases when the Jasa virus hiding as some legitimate tool, for example, the messages demanding to install a browser update or a vastly needed codec for online media playback. This is typically the way how some online frauds aim to force you into install the ransomware manually, by actually making you directly involve in this process.
Surely, the fraudulent update alert will not indicate that you are installing the threat. This installation will be disguised under some alert stating that you need to install an urgent security update or some suspicious program whatsoever.
Undoubtedly, the cracked apps represent the damage as well. Using P2P is illegal and may result in the injection of severe malware, including the Jasa ransomware.
To sum up, what can you do to prevent the injection of the ransomware into your computer? Even though there is no 100% assurance to prevent your PC from getting infected, there are certain tips I want to give you to avert the Jasa penetration. You must be careful while using free software today.
Ensure you always read what the installation window offers aside from the main free program. Keep away from opening dubious email attachments. Do not run files from the unknown senders. Naturally, your current security program must always be updated.
The malware does not states openly about itself. It will not be mentioned in the list of your available programs. However, it will be masked under some malicious process running consistently in the background, that starts at the moment when you boot up your computer.
How To Remove Ransomware?
Remove Jasa 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 Jasa 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 “Jasa 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 Jasa 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 .jasa Files?
How to restore big files?
Try removing .jasa extension on a few big files and opening them. This malware has issues with large files encryption. Either the virus read and did not encode the file, or it bugged and did not add the filemarker. If you have files that are very large (2GB+), such a situation is highly probable. Please, text me in the comments whether this helped you or not.
The newest extensions released around the end of August 2019 after the criminals made changes. This includes Jaoy, Taqw, Tasa etc.
As a result of the changes made by the criminals, STOPDecrypter is no longer backed. 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 available directories in order to unlock the currently reachable drives (the connected ones), including the network drives. You can choose extra locations with the “Add” button.
Decryptors usually offer several options depending on the specific malware family. The present possible options are presented in the Options tab and can be turned on or disabled there. You may locate 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 .jasa Files?
In some case ransomware is not doom for your files…
The Jasa ransomware encryption mechanism algoritm is next: it ciphers every file byte-by-byte, then saves a duplicate, removing (not overriding!) the original file. Hence, the data of the file placement on the disk drive is lost, but the original file is not erased from the physical disk. The cell, or the sector where this file was stored, can still contain this file, but it is absent in the file system and can be rewritten by data that has been loaded to this drive after the removal. Hence, it is possible to restore 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 open-source program, which is originally created for data recovery from damaged disks, or for data recovery in case if they are unintentionally deleted. However, as time has gone by, this program got the ability to restore the files of 400 different file types. Hence, it can be used for file recovery after the Jasa attack.
First, you need to download this app. It is 100% free, but the developer states that there is no warranty that your files will be recovered. PhotoRec is distributed together with other utility of the same developer – TestDisk. The program archive will bear 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 setup is required – this program has all the files it need within the archive, hence, you can mount it on your USB drive, and help your friends/parents/anyone who has been attacked by Jasa ransomware.
Upon the start, you will see the screen showing you the full list of your disk spaces. However, this information is 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 decision is to export them on USB drive or any other type of removable disk.
Then, you need to indicate the file formats. This option is located at the bottom, too. As it was mentioned, PhotoRec can retrieve 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 findings of the scan and recovery are shown.
Jasa 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 .jasa 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 Jasa 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 .JASA Files?
Name: JASA Ransomware
Description: The JASA 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 jasa extension. As a result, the affected files become inaccessible and unusable. Subsequently, the JASA 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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