“All of your files were protected by a strong encryption with RSA-4096”.
RSA-4096 denotes a standard of asymmetric encryption where both components of the public-private key pair are 4096 bits long. Such a high degree of entropy means that the objective of data decoding is hardly feasible unless the aforementioned private key is readily available. The crypto strength, unfortunately, has been misapplied by cybercrime actors over the past couple of years. Ransomware, a category of malicious code enciphering files belonging to infected users, turns this nonmalignant technology into a devastating tool for extortion. The only specimen that claims to harness this particular algorithm at this point is called TeslaCrypt.
Although all three iterations of said ransom trojan supposedly employ RSA-4096, it’s questionable how true-to-life such statements are. The only place where the standard is mentioned is in the ransom notes, which are documents that explain victims how to get their encrypted data back. However, analysis of several samples of this infection proves that it relies on a different mechanism, namely the AES cipher. This one is weaker, mainly because the encryption and decryption keys are identical. Security experts even managed to create an automatic decoder for some editions of the virus. And yet, affected computer users who seek assistance often judge the predicament by what they see in the ransom instructions, which say “All of your files were protected by a strong encryption with RSA-4096”. By the way, different versions of the TeslaCrypt hoax feature different titles of these documents. Howto_Restore_FILES is a widespread one. It’s available in HTM, TXT and PNG formats.
The ransomware under consideration also appends new extensions to the victim’s filenames. These allow determining the trojan variant and include .aaa, .abc, .ccc, .ecc, .exx, .micro, .mp3, .ttt, .vvv, .xyz, .xxx, and .zzz. In order to reinstate the defiantly withdrawn files, the user needs the unique private key, which is a subject of the imposed bargain with the racketeers. In other words, only a payment is grounds for decryption of the data. The bad guys ask for 2 Bitcoins or so. That’s a lot of money to pay for something you actually own. Anyway, do not panic after seeing the spooky-looking RSA-4096 alert. The ransom may be the sole option to restore information in some cases, but it may as well not be mandatory. The part below will advise you on the workarounds.
Automated removal of RSA-4096 ransomware
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
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 TeslaCrypt 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.
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.
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.