Updated April 4, 2023
Introduction to Ransomware decryption tools
Ransomware is a malicious attack that hacks or encrypts the data in your machine and demands a cost in return. There are few tools available to decrypt the file which is hacked by ransomware. It can be downloaded free and can be used without any flaws. Once the ransomware attack happens, it leaves a message and corrupts the file. Every attack has its properties and to decrypt these files and retrieve the original content, many decryption tools are available free of cost.
Tools for Ransomware decryption
Some of the effective ransomware decryption tools are discussed in this article.
1. AES_NI
It is applied in a ransomware attack in December 2016 and it is found in multiple users with unique file extensions. To encrypt the files, it merges RSA-2048 and AES-256 properties. It creates a local public key to encrypt the files and combined with a private key which is available in the C folder and a copy is stored in the C&C server. So, it encrypts the files this way and retrieves the original data without any ransom.
2. Alcatraz Locker
When a ransomware attack happened in November 2016, this software is used to encrypt the files by a combination of Base 64 coding and AES 256 encryption. The attacked files have an extension “.Alcatraz” and it leaves a message on the user’s desktop in the ransomed.html file
3. Apocalypse
Apocalypse deployed in ransomware attack happened in June 2016. Here the attack displays the file name with an extension “.FuckYourData”, or “.encrypted”. The important note should be is the password policy should be very strong and ensure that no one can break it. Because this attack happens via RDP in multi-national companies.
4. Badblock
To decrypt a badblock ransomware attack, the combo cleansing technique is used and it is removed in a lengthy process like scanning, detecting, code running, decrypting, and extracting the data. The badblock doesn’t rename the file and cannot be detected that easily and so it requires professional automated malware removal. After file decryption, the displayed message has a file with the extension of help decrypt.html
5. Bart
Bart is a unique malware attack that encrypts the files via phishing email and demands for bitcoin to decrypt the code. If any user, clicks a suspicious mail, the code will be downloaded and encrypt the files in Zip format and it changes the desktop images with a message like bart.zip. The decryption tool follows the brute force method to guess the password in the ransomware archive and follows multiple decryption steps to retrieve the data. Bart attacks even in absence of network connection and the decryption tool follows command-control server and RSA public-key cryptography.
6. BigBossRoss
The decryption tool for Bigbossross is designed to debug the files with AES128 encryption. It can be identified as it leaves the files with the extension of “.jpg”, “.bigbossross” or “.obfuscated” and develops #decryption with contact information of hackers to demand ransom. It also creates a “read.me” file in every folder. In few decryption tools, the data cannot be retrieved and it is advised to contact the hacker to avoid permanent data loss.
7. BTCWare
The decryption tool employed to encrypt the BTCware should decrypt AES 192 and RC4 coding. This malware attack happened in five different variants and the file is appended with the extension of .theva, .btcware, .cryptowin, .cryptobyte, .onyon.
8. Crypt888
The crypt888 attack alters the system wallpaper and includes the lock, at the beginning of the file name. The fake mail will be sent in the name of your bank, Paypal, and Microsoft which contains redirect links to his websites which in turn opens the gate to the hacker to encrypt and lock it. So it can be prevented by using a spam filter and can disable macros in office products. The file-sharing methods and morphed social media images can also pave the way to the Crypt888 attack. So after this attack, the corrupted files should be removed from the system before taking any actions or the virus may corrupt the entire files. In windows, select the task manager and kill the malicious process in file location and also choose windows repair registry.
9. Cryptomix
It is emerged Cryptoshield and encrypts the file by AES256 encryption. So the decryption tool works on the file using an offline key and decrypts the data. If the generated offline key doesn’t encrypt the data, the decryptor with mole variant retrieves the data without any modification in the original file. Here the file name changes with extension of .rmd, .rdmk, .scl, .lesli, .code and .cryptoshield
10. Crysis
To decrypt the Crysis ransomware attack, it follows the decryption of asymmetric and RSA-1024.
11. Delta
To decrypt the Delta, it should follow to decode the RC4 encryption and RSA-2048. The filename ends with .delta with several random alphabets. It leaves the ransom message in the “info.hta” file.
12. Encrypt tile
To decrypt this malware attack, the tool is designed to work on AES-128 encryption. It hacks the data in login time between system and user and leaves .docencryptile at end of the file name.
13. FindZip
The attack happens on Mac OS and the encryption happens in ZIP archives. The corrupted files comprise .findzip at end of the document. It changes the file names to how-to-decrypt and demands a ransom. To decrypt the files, we should involve Textwrangler, Xcode, pktrack source code, Xcode command-line tools. It is automated and can be decrypted in both Mac Yosemite, Mac-Sierra, and Windows. The user should install Xquartz for Windows and Wine for Mac to prevent Findzip ransomware attacks.
14. Fonix
The decryption tool for this software should crack the RSA-2048 session key, ChaCha encryption, SALSA encryption, and RSA-4096 master keys. This tool is available free with the RSA master key to decrypt the data. The encrypted files have the extension of “.XINOF” or “.FONIX”.
Conclusion
So to prevent such type of ransomware attack, the user should have a strong firewall, reliable anti-malware software with a secure web browser. We should not believe in spam and have a regular data backup practice.
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