|Algorithm||AES-256 encryption. If EPUB cannot establish a connection to crooks server before starting the encryption process, it uses the offline key. This key is the same for all victims(!), making it possible to decrypt .epub files in the future.|
|Ransom||From $490 to $980 (in Bitcoins)|
|Distribution||Third-party downloaders, installers, peer-to-peer networks, RDP exploits, etc.,|
|Other variants|| |
Spectating that your files have a strange .epub extension means that you are infected with EPUB ransomware. This dangerous virus extorts your money, previously encrypting the files you have on your computer. Crooks who manage the spreading of this malware ask almost $1000 for file decryption. Fortunately, there are several other ways to solve the problem.
The decryption process after the EPUB virus attack must be conducted with special software. Manual attempts (with brute force, for example) will take too much time - there are 2^256 keys existing for the cipher that EPUB malware uses. You will spend more time than our planet existed and will approximately exist. Meanwhile, tools that are designed specially to decrypt the files after the ransomware attack can do it just in an hour.
System repairing, however, must be conducted with other applications. Ransomware makes different changes in your Windows settings, and all of them are targeted at making your system weaker. Reverting these changes is vital because otherwise, you will struggle to install the programs or connect to various websites. GridinSoft Anti-Malware performs the system recovery during the ransomware removal process.
It is also important to mention how you get a virus. Almost all STOP/Djvu families (and EPUB ransomware is its member) uses the programs from untrustworthy sites as the main distribution way. People often use such sources as eMule, or ThePirateBay, to get a certain application for free. However, while making the programs usable without purchasing, hackers can freely add any sort of malware. Exactly, EPUB ransomware is just a case.
The EPUB ransomware uses the AES-256 encryption algorithm. That is not the strongest method, but it still provides an overwhelming amount of possible decryption keys. To brute force the 78-digit number of keys, you need 3.5 unvigintillion years (1*10^65), even if you use the most powerful regular PC. Quantum computers can show a bit better results, but it is still too slow to get your files back while you are alive.
The exact algorithm of encryption is next: malware scans each folder for the files it is able to encrypt. Then, when it finds the target, it makes a copy of your file, removes the original one, encrypts the copy and leaves it instead of the removed original. Such a procedure is done to prevent the situation when you have already opened the file, so ransomware is not able to read it because of the Windows restrictions. To each encrypted copy, the virus adds the specific extension - ".epub". Then, ransomware creates a _readme.txt file in the folder where the encrypted file is located, and goes to the next folder.
Such an encryption method can be exploited for file recovery. Since the original file is deleted, you may try to recover it using the file recovery tools. The less time is passed - the bigger the chance to get your files back, so hurry up!
Another specific moment that can help you to use the files even after the encryption is the fact that EPUB ransomware encrypts only the first 150KB of each file. Hence, you can try to run a big file, such as video or music, without the encryption. Similar feature also works with other ransomware families - Dharma, Conti and Makop encrypt the same 150KB.
Ransom note: _readme.txt
Ransom note is the same for the whole ransomware family. In fact, it is one of the main signs of to which family the certain ransomware belongs. Here is the typical note for STOP/Djvu family:
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: hxxps://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: [email protected] Reserve e-mail address to contact us: [email protected] Your personal ID: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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