How to remove Jasa Ransomware and decrypt .jasa files

What is Jasa Ransomware

Jasa Ransomware is a dangerous malware that encrypts files on a victim’s computer and demands a ransom payment in exchange for a decryption key to restore access to the encrypted files. Jasa Ransomware uses the Salsa20 encryption algorithm to encrypt files on the victim’s computer. It scans each folder for the files it is able to encrypt. Then, when it finds the target, it makes a copy of the file, removes the original one, encrypts the copy, and leaves it instead of the removed original. Jasa Ransomware adds a .jasa extension to the end of the encrypted files to authenticate its presence. The encryption process is almost unbreakable, making it difficult to recover the encrypted files without the decryption key. The ransom note created by Jasa Ransomware is titled _readme.txt and is placed in all the folders that keep the encrypted files. Here is how it looks like:

The ransom-demanding message informs the victim that their data has been encrypted, and file recovery necessitates paying a ransom worth $490 to $980. The ransom note also warns the victim that they should try to decrypt their encrypted data without a decryption key; otherwise, they will lose their data forever. 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. Currently, there are no decryption tools available for Jasa Ransomware. Victims are advised not to pay the ransom and instead seek professional help from cybersecurity experts. Disconnecting the infected machine from the internet is the first thing to do to prevent the ransomware from communicating with its command and control server. Victims can also use backup solutions and anti-malware software to protect their data. Data recovery software can also be used to recover some encrypted files.

How Jasa Ransomware infected your computer

Jasa Ransomware infects computers through various methods, including spam email messages, web injectors, malicious software installers, misleading online advertisements, and through another virus infection. The virus exploits loopholes in the operating system or software, enabling unauthorized entry into the system. The malware can worm its way into the system through a myriad of avenues, including spam emails, enticing ads, or even through a sneaky backdoor left open by another virus. Once the ransomware is executed, it creates a folder in the Windows system directory where it places a copy of itself and changes some Windows settings so that it starts up every time the computer is restarted or turned on.

1. Download Jasa Ransomware Removal Tool
2. Get decryption tool for .jasa files
3. Recover encrypted files with Stellar Data Recovery Professional
4. Restore encrypted files with Windows Previous Versions
5. Restore files with Shadow Explorer
6. Restore media files with Media Repair
7. How to protect from threats like Jasa Ransomware

Virus modifies “hosts” file to block Windows updates, downloading antivirus programs, and visiting sites related to security news or offering security solutions. Jasa Ransomware comes along with AZORult trojan, which was initially created to steal logins and passwords. The process of infection also looks like installing Windows updates, the malware shows a fake window, that mimics the 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. Jasa 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. The virus assigns a certain ID to the victims, which is used to name those files and supposedly to send a decryption key. Great tools to protect against Jasa Ransomware are: Emsisoft Anti-Malware and Malwarebytes Anti-Malware.

How to remove Jasa Ransomware manually

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

Jasa Ransomware files:

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

Jasa Ransomware registry keys:

no information

How to decrypt and restore .jasa files

Use automated decryptors

Download STOP Djvu Decryptor from EmsiSoft (.jasa variations)

IMPORTANT: Read this detailed guide on using STOP Djvu Decryptor to avoid file corruption and time wasting.

STOP Djvu Decryptor is able to decrypt .jasa files, encrypted by Jasa Ransomware. This tool was developed by EmsiSoft. It works in automatic mode, but in most cases works only for files encrypted with offline keys. Download it here:

Download STOP Djvu Decryptor

Dr.Web Rescue Pack

Famous antivirus vendor Dr. Web provides free decryption service for the owners of its products: Dr.Web Security Space or Dr.Web Enterprise Security Suite. Other users can ask for help in the decryption of .jasa files by uploading samples to Dr. Web Ransomware Decryption Service. Analysis of files will be performed free of charge and if files are decryptable, all you need to do is purchase a 2-year license of Dr.Web Security Space worth $120 or less. Otherwise, you don’t have to pay.

If you are infected with Jasa 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 .jasa files

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.

Use Media Repair to decrypt media files encrypted with .jasa

1. Download Media Repair tool.
2. Right-click on the downloaded archive, and select Extract to Media_Repair\.
3. Then double-click on the extracted .exe file to launch the utility.
4. At first, you have to choose which file type you want to decrypt. You can do it from the drop-down menu in the utility.
5. Next, browser the folder with encrypted or reference files. Choose any of them and click on the Test icon located in the top right corner.
6. Media Repair will display a pop-up message with information on whether it can repair the selected file or not.
7. After checking if it is possible or not, select your reference file and click on the icon right under the Test button we used in step #5.
8. If the file pair is properly matched, you can move on and hit the Play button to start repairing. You can also stop the process anytime by clicking on the Stop button.

How to protect computer from viruses, like Jasa Ransomware, in future

1. Get special anti-ransomware software

Use G-DATA STOP/Djvu vaccine

G DATA has released a vaccine to block STOP/DJVU ransomware from encrypting victims’ files after infection. The vaccine prevents the ransomware from encrypting files anymore, but it does not prevent the infection itself. The vaccine is available on GitHub. Download it below:

Download STOP/Djvu vaccine

Use ZoneAlarm Anti-Ransomware

Famous antivirus brand ZoneAlarm by Check Point released a comprehensive tool, that will help you with active anti-ransomware protection, as an additional shield to your current protection. The tool provides Zero-Day protection against ransomware and allows you to recover files. ZoneAlarm Anti-Ransomware is compatible with all other antiviruses, firewalls, and security software except ZoneAlarm Extreme (already shipped with ZoneAlarm Anti-Ransomware) or Check Point Endpoint products. The killer features of this application are: automatic file recovery, overwrite protection that instantly and automatically recovers any encrypted files, file protection that detects and blocks even unknown encryptors.

Download ZoneAlarm Anti-Ransomware

2. Back up your files

As an additional way to save your files, we recommend online backup. Local storage, such as hard drives, SSDs, flash drives, or remote network storage can be instantly infected by the virus once plugged in or connected to. Jasa Ransomware uses some techniques to exploit this. One of the best services and programs for easy automatic online backup is iDrive. It has the most profitable terms and a simple interface. You can read more about iDrive cloud backup and storage here.

Download iDrive

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

Malicious attachments to spam or phishing e-mails are the 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 MailWasher Pro. It works with various desktop applications and provides a very high level of anti-spam protection.

Download MailWasher Pro