The Guer virus is a STOP/DJVU family of ransomware-type infections. This virus encrypts your files (video, photos, documents) that can be tracked by a specific “.guer” extension. It uses a strong encryption method, which makes it impossible to calculate the key in any way.
Guer uses a unique key for each victim, with one exception:
- If Guer cannot establish a connection to its command and control server (C&C Server) before starting the encryption process, it uses the offline key. This key is the same for all victims, making it possible to decrypt files encrypted during a ransomware attack.
I have gathered a complete collection of all possible solutions, tips, and practices in neutralizing the Guer virus and decrypting files. In some cases, it is easy to recover your files. And sometimes it is just impossible.
There are several universal methods for recovering encrypted .guer files, which will be demonstrated below. It is vital to read the entire instruction manual carefully and make sure to understand it all. Do not skip any steps. Each of these steps is very important and must be completed by you.
Guer virus?
☝️ Guer can be correctly identify as a STOP/DJVU ransomware-type infection.
Guer
🤔 Guer virus is ransomware that originates from the DJVU/STOP family. Its primary purpose is to encrypt files that are important for you. After that ransomware virus asks its victims for a ransom fee ($490 – $980) in BitCoin.
The Guer ransomware is a kind of threat that encrypted your documents and then forces you to pay for them. Djvu/STOP ransomware family was first revealed and analyzed by virus analyst Michael Gillespie.
Guer virus is basically similar to other representatives of DJVU ransomware like: Aeur, Hhqa, Moqs. This virus encrypt all common file types and adds its particular “.guer” extension into all files. For instance, the file “1.jpg”, will be amended into “1.jpg.guer“. As soon as the encryption is accomplished, virus creates a special message file “_readme.txt” and puts it into all folders that contain the modified files.
The image below gives a clear vision of how the files with the “.guer” extension look like:
Guer File (STOP/DJVU Ransomware)
| Name | Guer Virus |
| Ransomware family1 | DJVU/STOP2 ransomware |
| Extension | .guer |
| Ransomware note | _readme.txt |
| Ransom | From $490 to $980 (in Bitcoins) |
| Contact | [email protected], [email protected] |
| Detection | Trojan-Ransom.Win32.GandCrypt.ewt, TrojanClicker:Win32/BuddyLinks.A, Trojan-Ransom.NSIS.MyxaH.pfd |
| Symptoms |
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| Fix Tool |
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This _readme.txt file asking payment is for get files back via decryption key:
_readme.txt (STOP/DJVU Ransomware) – The scary alert demanding from users to pay the ransom to decrypt the encoded data contains these frustrating warnings
The cryptography algorithm used by DJVU/STOP ransomware family is AES-256. So, if your files got encrypted with an online decryption key, which is unique. The sad reality is that it is impossible to decrypt the files without the unique key.
If Guer worked in online mode, you can’t gain access to the AES-256 key. It is stored on a distant server owned by the frauds who distribute the Guer ransomware.
For receiving decryption key the payment should be $980. To obtain the payment details, the victims are encouraged by the message to contact the frauds by email ([email protected]).
The message by the ransomware states the following information:
ATTENTION! Don't worry. You can return all your files! All your files like photos, databases, documents, and other important are encrypted with the strongest encryption and unique key. The only method of recovering files is to purchase a decrypt tool and unique key for you. This software will decrypt all your encrypted files. What guarantees do you have? You can send one of your encrypted files from your PC, and we decrypt it for free. But we can decrypt only 1 file for free. Furthermore, the file must not contain valuable information. You can get and look video overview decrypt tool: https://we.tl/t-WJa63R98Ku The price of the private key and decrypt software is $980. Discount 50% available if you contact us first 72 hours, that's the price for you is $490. Please note that you'll never restore your data without payment. Check your e-mail "Spam" or "Junk" folder if you don't get an answer in more than 6 hours. To get this software you need writes on our e-mail: [email protected] Reserve an e-mail address to contact us: [email protected] Your personal ID: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Do not pay for Guer!
Please, try to use the available backups, or Decrypter tool
_readme.txt file also indicates that the computer owners must get in touch with the Guer representatives during 72 hours starting from the moment of files were encrypted. On the condition of getting in touch within 72 hours, users will be granted a 50% rebate. Thus the ransom amount will be minimized down to $490). Yet, stay away from paying the ransom!
I strongly advise that you do not contact these crooks and do not pay. The one of the most real working solution to recover the lost data – just using the available backups, or use Decrypter tool.
The peculiarity of all such viruses applies a similar set of actions to generate the unique decryption key to recover the ciphered data.
Thus, unless the ransomware is still under the stage of development or possesses some hard-to-track flaws, manually recovering the ciphered data is a thing you can’t perform. The only solution to prevent the loss of your valuable data is to make backups of your crucial files regularly.
Note that even if you maintain such backups regularly, they ought to be put into a specific location without loitering, not being connected to your main workstation.
For instance, the backup may be kept on the USB flash drive or some alternative external hard drive storage. Optionally, you may refer to the help of online (cloud) information storage.
Needless to mention, when you maintain your backup data on your common device, it may be similarly ciphered as well as other data.
For this reason, locating the backup on your main computer is surely not a good idea.
How I was infected?
Ransomware has a various methods to built into your system. But it doesn’t really matter what way had place in your case.
Guer attack following a successful phishing attempt.
- hidden installation along with other apps, especially the utilities that work as freeware or shareware;
- dubious link in spam emails leading to the virus installer
- online free hosting resources;
- using illegal peer-to-peer (P2P) resources for downloading pirated software.
There were cases when the Guer virus was disguised as some legitimate tool, for example, in the messages demanding to initiate some unwanted software or browser updates. This is typically the way how some online frauds aim to force you into installing the Guer ransomware manually, by actually making you directly participate in this process.
Surely, the bogus update alert will not indicate that you will actually inject the ransomware. This installation will be concealed under some alert mentioning that allegedly you should update Adobe Flash Player or some other dubious program whatsoever.
Of course, the cracked apps represent the damage too. Using P2P is both illegal and may result in the injection of serious malware, including the Guer ransomware.
To sum up, what can you do to avoid injecting the Guer ransomware into your device? Even though there is no 100% guarantee to prevent your PC from getting damaged, there are certain tips I want to give you to prevent the Guer penetration. You must be cautious while installing free software today.
Make sure you always read what the installers offer in addition to the main free program. Stay away from opening dubious email attachments. Do not open files from the unknown addressees. Of course, your current security program must always be updated.
The malware does not speak openly about itself. It will not be mentioned in the list of your available programs. However, it will be masked under some malicious process running regularly in the background, starting from the moment when you launch your PC.
How To Remove Guer Virus?
In addition to encode a victim’s files, the Guer virus has also started to install the Azorult Spyware on system to steal account credentials, cryptocurrency wallets, desktop files, and more.3
Reasons why I would recommend GridinSoft4
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Run the setup file.
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Press “Install” button.
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Once installed, Anti-Malware will automatically run.
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Wait for complete.
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Click on “Clean Now”.
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