Remove Jager Ransomware and Restore AES and RSA Encrypted Files - How to, Technology and PC Security Forum |

Remove Jager Ransomware and Restore AES and RSA Encrypted Files

Jager-Ransomware-sensorstechforum-main-decrypt-files-ransom-noteJagerDecryptor – this is what victims of the Jager ransomware see after their files have been encoded using a strong AES-256 and RSA-2048 encryption ciphers. This type of ransomware attacks has increased in both numbers and sophistication. The cyber-criminals behind Jager ransomware leave a ransom note asking victims to pay the sum of 100$ to restore their files. After 24 hours the price becomes 150$ and after 48h – 200$. On top of this, the virus threatens to destroy the decryption keys in 72 hours.

Everyone whose computer has been infected by Jager ransomware is advised to immediately remove this virus and try other methods to restore their files instead of paying the ransom. In this article, we have provided more information about this virus as well as instructions on how to remove Jager and try to restore your files.

Threat Summary



Short DescriptionJager uses a combination of AES-256 and RSA-2048 ciphers to encrypt the files of victims and ask 100$ for decryption as a payment in BitCoins.
SymptomsThe user may witness ransom message in a “Important_Read_Me.html” file which explains that there are 72 hours to pay the ransom otherwise the files will be gone forever.
Distribution MethodVia exploit kits, drive by download, JavaScript attacks or PUPs.
Detection Tool See If Your System Has Been Affected by Jager


Malware Removal Tool

User ExperienceJoin our forum to Discuss Jager Ransomware.

How Does Jager Ransomware Spread

Cyber-criminals behind Jager ransomware may use a wide variety of tools to spread this ransomware, hide it from anti-malware software and other functions:

The most commonly used spam technique is associated with massive spam e-mail campaigns. Such may either contain two types of malicious objects:

Malicious files uploaded as attachments to the e-mail. They may be Microsoft Office documents with malicious macros which are activated after you click on the “Enable Editing” button. They may also be .js files or executables appearing to look like pictures or other types of files.

Malicious web links. They may contain malicious scripts that induce a drive-by download attack. The links may originally appear legitimate, and this is because they are, however, they cause a redirect to the malicious host which infects the computer without the user’s knowledge.

The e-mails sent by cyber-criminals usually appear to resemble messages from legitimate services like PayPal, eBay or other services.

Jager Ransomware – In Depth Analysis

After it has slipped past the defenses of a targeted machine, Jager Ransomware uses advanced techniques to run while being obfuscated and drop its payload. The virus may create files in the following targeted Windows directories:

  • %AppData%
  • %Temp%
  • %Windows%
  • %Common%
  • %Roaming%
  • %Local%

The files may either have completely random names, names that resemble legitimate programs or their installers and even names which make them seem like legitimate Windows processes in Windows Task Manager, for example, svchost.exe.

After it has dropped its malicious files, Jager ransomware may also create custom values for its encryption file to run on Windows startup. This is achievable by modifying the Run or RunOnce registry keys:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

When Jager Ransowmare begins to encipher user files, it scans for a wide variety of file types:

→ .3dm, .3ds, .3g2, .3gp, .7z, .accdb, .aes, .ai, .aif, .apk, .app, .arc, .asc, .asf, .asm, .asp, .aspx, .asx, .avi, .bmp, .brd, .bz2, .c, .cer, .cfg, .cfm, .cgi, .cgm, .class, .cmd, .cpp, .crt, .cs, .csr, .css, .csv, .cue, .db, .dbf, .dch, .dcu, .dds, .dif, .dip, .djv, .djvu, .doc, .docb, .docm, .docx, .dot, .dotm, .dotx, .dtd, .dwg, .dxf, .eml, .eps, .fdb, .fla, .flv, .frm, .gadget, .gbk, .gbr, .ged, .gif, .gpg, .gpx, .gz, .h, .htm, .html, .hwp, .ibd, .ibooks, .iff, .indd, .jar, .java, .jks, .jpg, .js, .jsp, .key, .kml, .kmz, .lay, .lay6, .ldf, .lua, .m, .m3u, .m4a, .m4v, .max, .mdb, .mdf, .mfd, .mid, .mkv, .mml, .mov, .mp3, .mp4, .mpa, .mpg, .ms11, .msi, .myd, .myi, .nef, .note, .obj, .odb, .odg, .odp, .ods, .odt, .otg, .otp, .ots, .ott, .p12, .pages, .paq, .pas, .pct, .pdb, .pdf, .pem, .php, .pif, .pl, .plugin, .png, .pot, .potm, .potx, .ppam, .pps, .ppsm, .ppsx, .ppt, .pptm, .pptx, .prf, .priv, .privat, .ps, .psd, .pspimage, .py, .qcow2, .ra, .rar, .raw, .rm, .rss, .rtf, .sch, .sdf, .sh, .sitx, .sldx, .slk, .sln, .sql, .sqlite, .sqlite, .srt, .stc, .std, .sti, .stw, .svg, .swf, .sxc, .sxd, .sxi, .sxm, .sxw, .tar, .tbk, .tex, .tga, .tgz, .thm, .tif, .tiff, .tlb, .tmp, .txt, .uop, .uot, .vb, .vbs, .vcf, .vcxpro, .vdi, .vmdk, .vmx, .vob, .wav, .wks, .wma, .wmv, .wpd, .wps, .wsf, .xcodeproj, .xhtml, .xlc, .xlm, .xlr, .xls, .xlsb, .xlsm, .xlsx, .xlt, .xltm, .xltx, .xlw, .xml, .yuv, .zip, .zipx, .dat Source: Trendmicro

After encrypting the files, their first 4 bytes of code begins with the indication ! ENC. The ransomware then drops an .HTML file named “Important_Read_Me.html”. It aims to scare the affected user into paying the ransom by giving short deadlines and threatening to destroy any decryption possibilities.

The message is the following:

All your files have been encrypted with RSA-2048 and AES-256 ciphers. To decrypt your files, you need a private key which only we have on our server and nobody else.
Decryption price: 100$
Decryption price after 24h: 150$
Decryption price after 48h: 200$
After 72h: All your files will be unrecoverable
Contact us with email for more information about price and payment process ([email protected]) don’t forget to include your unique id ({USER ID HERE})
We will use BitCoins for payment. If you haven:
1. Start by creating a BitCoin wallet(we recommend
2. Buy necessary amount of BitCoins, our recommendations:

→ – A good service for Europe – Get BTC via Visa/MC or SEPA (EU) bank transfer – Buy Bitcoins using Visa / Mastercard or Wire Transfer. – It is recommended for the fast and easy service. Payment methods: Western Union, Bank of America, cash through FedEx, Moneygram, and/or wire transfer – Old and proven Bitcoin dealer – Bitcoins dealer (Visa/Mastercard, etc.) – International catalog of Bitcoins exchanges – Another Bitcoins sellers catalog – International catalog of Bitcoins exchanges – A catalog for the European Union

We will decrypt one file for free which is less than 200KB to show that our decryptor works. You can find this document in desktop and documents folders

Jager Ransomware’s Encryption Explained

The encryption algorithms which are being used by Jager ransomware are the following:

  • RSA-2048 (Rivest Shamir Adleman).
  • AES-256 (Advanced Encryption Standard).

The encryption process is rather sophisticated but to simply explain it, the AES cipher is used to encrypt the files, changing their hex code structure. It may not encrypt the entire file. Instead it may use bits of data which it encodes. This is enough to render the file unusable.

The RSA cipher may then be used to encrypt the AES decryption key which is created after the encryption of the files is done.

The encryption procedure by Jager may look like the sequence in the following image:


Related Article: Ransomware Encryption Explained – Why Is It So Effective?

To decrypt the files, the cyber-criminals use the reverse procedure – they have programmed a decryptor which works with the RSA key which is sent to them. After they upload the files on the decryptor, it simply uses the key, unlocks the file and then it can be used again.

However, if the affected user tries direct decryption by using different factorization methods, it will take an enormous amount of time.

Related Article: Restore Files Encrypted via RSA Encryption

These ciphers (RSA and AES) are some of the top algorithms used by the government to encrypt top secret files and their decryption if you do not know the key may take hundreds of years if your computer does not break by that time.

Remove Jager Ransomware and Try To Restore the Encoded Files

Jager ransomware is a very powerful virus. It may spread even further, and experts strongly advise users to employ a relevant ransomware protection against it. It is also highly recommended not to pay any ransom and wait for a decrypter to be released out to the public which may happen eventually. Malware researchers are constantly analyzing viruses and discovering holes in their code which eventually allow them to create free decryptors.

We advise you to follow the removal instructions below to delete Jager ransomware completely and wait for us to update this article with a decrypter. In the meantime, you may attempt the other methods for file restoration which we have provided in step “3. Restore files encrypted by Jager” below. They may not be 100% successful, but there is a chance you may restore at least some of your files for free which is a good temporary solution until a decryptor is released.

Ventsislav Krastev

Ventsislav has been covering the latest malware, software and newest tech developments at SensorsTechForum for 3 years now. He started out as a network administrator. Having graduated Marketing as well, Ventsislav also has passion for discovery of new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management and then Network Administration, he found his passion within cybersecrurity and is a strong believer in basic education of every user towards online safety.

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