Home Guides LeChiffre ransomware virus: decrypt and remove

LeChiffre ransomware virus: decrypt and remove

3 min read
Find out what’s nonstandard about the LeChiffre ransom Trojan, get efficient prevention advice and learn how to restore .LeChiffre extension files.

The crypto infection dubbed LeChiffre isn’t the most sophisticated one, but it proved to be enduring enough to stick around for many months. Originally discovered in spring of 2015, this contagion has been modified several times ever since. There’s a number of common denominators in all of its iterations, including the data encryption algorithm, the .LeChiffre extension that’s concatenated to skewed files, the names of documents with ransom instructions, as well as the unusual way of execution on targeted Windows computers. This ransomware uses a combo of RSA-1024 and AES cryptosystems to jumble bytes constituting a victim’s data elements, thus making it impossible to open files. The post-encryption routine involves the appending of a specific extension, from which the malware actually got its name.

_How to decrypt LeChiffre files.html document
_How to decrypt LeChiffre files.html document

To inform users about their options to recover the enciphered data, the Trojan creates ransom notes named “_How to decrypt LeChiffre files.html”. This item is opened with the default web browser on the machine. The contents of this walkthrough include the following information: “Attention! Your important files (photos, videos, documents, archives, databases, backups, etc.) were crypted with the strongest military cipher RSA1024 and AES. No one can help you to restore files without our decoder.” The victim is further told to send an email to decrypt.my.files@gmail.com with the title “_secret_code.txt” and attach a couple of .doc, .xls or .jpg files that are less than 5 MB in size. In response, the threat actors will supposedly send the decrypted editions of these entities along with the conditions of recovering the rest. The scoundrels also emphasize that the user will be able to get their data back for free, but not earlier than in six months.

Muddled files with .LeChiffre extension
Muddled files with .LeChiffre extension

An offbeat thing about LeChiffre is the payload deployment method. Most of the time, the loader is executed on PCs manually, as opposed to the routine used by the overwhelming majority of ransomware threats. In particular, the attackers find and harness remote access connections protected by weak user credentials. This way, they can literally deposit the offending loader and launch it without much chance for detection on the victim’s end. Another facet of this approach makes it possible for the extortionists to perform encryption offline, that is, without the ransomware reaching out to a C2 server to obtain the public crypto key. While considerably restricting the attack surface, this tactic has obvious benefits for the criminals.

Despite the fact that security analysts have contrived a decryptor for LeChiffre, it is reportedly inefficient for cracking the most recent edition of the ransomware. With that in mind, the prospect of paying 2 Bitcoins, which is over 1000 USD, is a harsh one. Under the circumstances, it’s worthwhile to try some restoration techniques that are helpful in a lot of crypto malware scenarios.

Automated removal of LeChiffre 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 .LeChiffre files 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 .LeChiffre 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 the 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 LeChiffre 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 LeChiffre ransomware removal tool

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