If your files have been encrypted, we accept the challenge of analyzing your case.

Ransomware Khonsari

The Khonsari ransomware was the first group to exploit known Apache Log4j vulnerabilities (CVE-2021-44228 and CVE-2021-45046), the group has focused its attacks on Windows servers that have not had Log4j updated.

The group’s first registration occurred in December 2021, which all indicates that the group was created to directly exploit Apache Log4j vulnerabilities, but this may be just the beginning, the group may broaden its scope.

Unlike groups that use RaaS tactics, Khonsari is a closed and exclusive group, which shows that their attacks are targeted at specific companies.

The malware is relatively simple and small, it weighs only 12 KB, this makes it virtually unnoticeable for antivirus, the group acts only with encryption and there is no file theft.

The group uses AES 128 encryption, and interestingly the decryption key is also encrypted, but RSA encryption is used.

The key stays in the ransom note that is opened automatically after encrypting files, the .khonsari extension is added to all encrypted files.

If the note is deleted, the files cannot be decrypted, because the key was deleted along with the note.

If the decryption key is deleted, only a company that specializes in recovering files encrypted by ransomware can recover the files.

The best defense against Khonsari ransomware is to keep Log4j up to date.

Khonsari Ransomware

Recover Files Encrypted by Khonsari Ransomware

Recovery of files encrypted by Khonsari ransomware is possible even without the decryption key, Digital Recovery is capable of it.

With more than two decades in the data recovery market, we have developed the necessary experience to act in the most drastic data loss scenarios, which today is summed up as data loss by ransomware attack.

We can recover encrypted files on hard drives, SSDs, databases, storages (NAS, DAS, SAN), RAID systems, servers, virtual machines, among others.

All our processes are exclusive and customized for each client, during the whole process the client will be in contact with one of our specialists.

We make available to all our clients the confidentiality agreement (NDA).

Contact us and start the recovery process right now.

Ransomware Recovery FAQ

Every day, ransomware attacks get better and better. After a successful attack attempt, ransomware quickly maps the user’s most important files to begin encryption. Microsoft Office files, databases, PDFs and design are among its main targets.

Ransomware is designed to be unnoticeable, so it can disable all system defenses without being noticed and start the process of encrypting the files. Even though ransomware can go unnoticed by the system, it can still be noticed by the user, because ransomware uses the system’s own resources to do the encryption, this can slow down the system. Ransomware also changes file extensions. So be on the lookout for these signs: System slowdown and extensions being added to files.

To find out more, talk to our experts.

Yes, it is possible. You can restart the computer in safe mode which will limit the ransomware’s action as system resources will be locked. You can also disconnect the computer from the Internet which can interrupt the hackers’ connection to your system, it is worth remembering that there is ransomware that works even without being connected to the Internet. You can also start the diagnostics to identify threats with your antivirus, the vast majority of antiviruses have this function.
But there are cases where the encryption was interrupted by the user, some files had already been affected and this caused an error in the encryption and even the hackers could not restore the files, even with the decryption key. In these cases only a data recovery company, such as Digital Recovery, can recover the files.

To find out more, talk to our experts.

Yes, attacks usually happen mainly on holidays and weekends during the early morning hours. These days are chosen because there are not many active users on the system, which prevents the attack from being discovered before the encryption is completed.

To find out more, talk to our experts.

The vast majority of ransomware uses RSA [Rivest-Shamir-Adleman]-2048 and AES [Advanced Encryption Standard] encryption.

To find out more, talk to our experts.

First of all, do not pay the ransom. No matter what the hackers say, there is no guarantee that the decryption key will actually be released after the ransom is paid.
The first thing to do is to inform the authorities about the attack, governments have specialized cybercrime departments that will investigate the attack. After that, check if your backups were affected, if they were, only a company specialized in data recovery can recover your files, this is the next step. Contact Digital Recovery who will assist you in the complete recovery of your files.

To find out more, talk to our experts.

After first contacting us and sending the affected media we will diagnose the device to check the extent of the damage caused by the ransomware, with this we can project the duration of the process, and provide the budget to the customer. After the budget is approved by the customer, we start the recovery process, for this we have exclusive software that can, with the help of our specialists, reconstruct the data.
If the customer opts for remote recovery, instead of sending us the media, he/she will send the encrypted files to a virtual environment, which is totally safe, so that we can access them.
After the end of the process we will do a double check so that the customer can verify the integrity of the recovered files.
Payment is only made after delivery of the files and validation of the same by the client.

To find out more, talk to our experts.

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Redação Digital Recovery
Redação Digital Recovery
Team Digital Recovery is composed of data recovery specialists who, in a simple way, aim to bring information about the latest technologies on the market, as well as inform about our ability to act in the most complex data loss scenarios.
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