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Decrypt RZA4096 ransomware: “All of your files were protected by a strong encryption with RZA4096”

3 min read
This is a self-help walkthrough applicable for computer troubleshooting and decrypting personal data scrambled by RZA4096, or CryptXXX, ransomware.

Linguistic literacy is definitely a weak link of the gang responsible for distributing one of today’s nastiest ransom Trojans called CryptXXX and its alias known as UltraCrypter. The number of spelling errors that these guys did in the TXT edition of the restoration instructions is quite striking. Rather than write the correct denomination of the cryptosystem used to encode data, which is RSA-4096, the ne’er-do-wells mention RZA4096. This fact, however, does not appear to indicate that CryptXXX authors are unprofessional. The strength of the crypto and its flawless implementation is sufficient to make victims consider paying the ransom of 1.2 Bitcoins, or approximately 500 USD. Incidentally, the contaminated users often enter ‘RZA4096’ as the keyword when seeking assistance online.

TXT version of decrypt instructions created by RZA4096 ransomware
TXT version of decrypt instructions created by RZA4096 ransomware

The ransomware under consideration has gone through several tweaks during the last two months. While the earlier iterations featured specific extensions appended to one’s files, for instance .crypz, .cryptz, .cryp1, .crypt1, the latest variant concatenates a random string of 5 characters and digits that varies from prey to prey. An example would be something like .51FCD or .AD3A1. This isn’t the only change that surfaced, though.

The set of files that the infection drops on Windows Desktop and inserts into encrypted directories is now randomized as well. The names of these documents are derived from the unique 12-character ID that the victim got in the course of the compromise. Their formats are HTML, TXT and BMP. The Notepad version mentioned above says “All of your files were protected by a strong encryption RZA4096”. For more specific directions, the user is provided with a number of Tor gateways that point to a page titled “Decryption service”.

Victim-specific Decryption service page
Victim-specific Decryption service page

When on the decrypt page, the infected person is updated on the status of the attack. In particular, they can learn how much time is left before the ransom doubles and becomes 2.4 BTC, which is more than 1000 USD. The operating system details and IP address displayed on there are probably intended to make the assault look more sophisticated. Ultimately, the extortionists tell the victim to buy a piece of software called UltraDeCrypter, which will allegedly decrypt all data in a matter of minutes. Unfortunately, a lot of the RZA4096 attack incidents prove the opposite: paying up does not guarantee file recovery.

CryptXXX arrives at Windows computers through the aid of an exploit kit (EK), which harnesses security flaws in outdated software in order to execute the ransomware. By the way, there has been a shift from the Angler exploit kit to Neutrino in this campaign recently. This attack vector relies on a network of hacked websites which, when visited, redirect people to the EK’s landing page in a covert fashion.

Anyone hit by the RZA4096 strain of this crypto contagion should try several simple recovery techniques before delving deeper into cipher entropy or meeting the perpetrators’ demands.

Automated removal of RZA4096 virus

Owing to an up-to-date database of malware signatures and intelligent behavioral detection, the recommended software can quickly locate the infection, eradicate it and remediate all harmful changes. So go ahead and do the following:

1. Download and install the antimalware tool. Open the solution and have it check your PC for PUPs and other types of malicious software by clicking the Start Computer Scan button

Download RZA4096 virus remover

2. Rest assured the scan report will list all items that may harm your operating system. Select the detected entries and click Fix Threats to get the troubleshooting completed.

Ways of non-ransom recovery of encrypted files

Cracking the crypto used by this ransom Trojan is more of a science fiction thing rather than an attainable prospect for the masses. This is why the troubleshooting in predicaments of this sort is a matter of two approaches: one is to pay the ransom, which isn’t an option for many victims; and the other is to apply instruments that take advantage of the ransomware’s possible weaknesses. If the latter is your pick, the advice below is a must-try.

Backups can make your day

Not only are you a lucky person in case you’ve been backing up your most important files, but you’re also a wise and prudent user. This isn’t necessarily a resource-heavy activity these days – in fact, some providers of online services are allocating a sufficient size of cloud storage space for free so that every customer can easily upload their critical data without paying a penny. Having removed RZA4096 ransomware, therefore, all you have to do is download your stuff from the remote server or transfer it all from an external piece of hardware if that’s the case.

Restore previous versions of encrypted files

A positive upshot of using this technique depends on whether or not the ransomware has erased the Volume Shadow Copies of the files on your PC. This is a Windows feature that automatically makes and keeps the backups of data elements on the hard drive as long as System Restore is enabled. The cryptoware in question is programmed to switch off the Volume Shadow Copy Service (VSS), but it has reportedly failed to in some cases. Checking one’s options regarding this workaround is doable in two ways: through the Properties menu of each file or by means of the remarkable open-source tool called Shadow Explorer. We recommend the software-based way because it’s automated, hence faster and easier. Just install the app and use its intuitive controls to get previous versions of the encrypted objects reinstated.
Shadow Explorer

Data recovery toolkit to the rescue

Some strains of ransomware are known to delete the original files after the encryption routine has been completed. As hostile as this activity appears, it can play into your hands. There are applications designed to revive the information that was obliterated because of malfunctioning hardware or due to accidental removal. The tool called Data Recovery Pro by ParetoLogic features this type of capability therefore it can be applied in ransom attack scenarios to at least get the most important files back. So download and install the program, run a scan and let it do its job.

Download Data Recovery Pro

Data Recovery Pro

Ransomware Prevention Tips

To avoid the RZA4096 ransomware and other file-encrypting infections in the future, follow several simple recommendations:

  • Toggle your email provider’s anti-spam settings to filter out all the potentially harmful incoming messages. Raising the bar beyond the default protection is an important countermeasure for ransom Trojans

  • Define specific file extension restrictions in your email system. Make sure that attachments with the following extensions are blacklisted: .js, .vbs, .docm, .hta, .exe, .cmd, .scr, and .bat. Also, treat ZIP archives in received messages with extreme caution

  • Rename the vssadmin.exe process so that ransomware is unable to obliterate all Shadow Volume Copies of your files in one shot

  • Keep your Firewall active at all times. It can prevent crypto ransomware from communicating with its C&C server. This way, the threat won’t be able to obtain cryptographic keys and lock your files

  • Back up your files regularly, at least the most important ones. This recommendation is self-explanatory. A ransomware attack isn’t an issue as long as you keep unaffected copies of your data in a safe place

  • Use an effective antimalware suite. There are security tools that identify ransomware-specific behavior and block the infection before it can do any harm.
These techniques are certainly not a cure-all, but they will add an extra layer of ransomware protection to your security setup.

Revise your security status

Post-factum assessment of the accuracy component in malware removal scenarios is a great habit that prevents the comeback of harmful code or replication of its unattended fractions. Make sure you are good to go by running an additional safety checkup.

Download RZA4096 ransomware removal tool

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