Djvu VirusRansomwareRemoval Guide

Guer Virus Removal Guide (+Decrypt .guer files)

Guer Virus Ransomware

Guer is a destructive software application working as typical ransomware. Michael Gillespie, the widely known malware researcher, first found this new name in the DJVU ransomware family.

Guer was developed for the sole function to encrypt all popular file types. Realistically, as soon as the encryption is successfully achieved, the users are unable to get access to them. Guer virus includes its own “.guer” to all the encrypted files. For example, the file “price_list.xls”, when crypted by Guer, will be entitled as “price_list.xls.guer”. As soon as the file encryption is accomplished, Guer puts its own distinct text file (_readme.txt) into all the folders that keep the encrypted files.

The alert mentioned by _readme.txt asking for the random os very comparable to the notifications given by other ransomware hazards coming from the DJVU family. The warning basically shows that the files have been encrypted and the only solution to get access to it is to use an unique standalone key. Regretfully, this statement is definitely true.

The technique to encrypt the files used by Guer is not completely investigated. However, there is no doubt that each computer system owner might be issued a special decryption key, which is absolutely special. It is very tough to recover the information without the appropriate key in place.

“Don’t worry, you can return all your files!”, from _readme.txt message:

Don't worry, you can return all your files! virus

One more peculiarity of the Guer infection is that the users are unable to get access to the key. The decrypting key is hosted on a special server under the complete control by the crooks who have actually introduced the Guer ransomware into the world wide web. In order to acquire the key and restore the important data, the users are told to get in touch with the frauds via e-mail or by telegram and to pay the ransom in the quantity of $980.

The message likewise says that the people need to get in touch with the Guer authors within 72 hours upon the minute of the data encryption. The alert shows that by doing so the people will acquire a 50% discount, therefore, the ransom quantity drops down to $490.

No matter what the quantity of the ransom is, we strongly advise that you do not pay the ransom. There is no guarantee that these online crooks will keep their guarantees, so they might not care at all what the victims feel about the file encryption, even when the quantity of the ransom is received into their accounts. Hence, paying ransom typically does not result in a successful healing. So, the users may just lose their money for absolutely nothing.

Likewise, we advise you not to get in touch with the scams as they instruct. Do not transfer cash into their wallets. There are no applications that might break the Guer virus or bring back the data at no charge. Therefore, the only appropriate decision is to bring back the data from possible backups (if available).

Virus Summary

NameGuer Ransomware
File Extensionguer
Short DescriptionThe ransomware encrypts all the data stored on your system and requires a ransom to be paid on your part supposedly to recover your important files.
SymptomsFile encryption by the ransomware is performed by means of the AES-256 algorithm (CFB mode) encryption algorithm. Once the encryption is completed, the ransomware adds its special .guer extension to all the files modified by it.
Distribution MethodAdware bundles and software cracks
Similar InfectionsLokas, Besub, Nusar
Guer Removal Tool   GridinSoft Anti-Malware
Guer Decryption Tool   Emsisoft Djvu Decryptor

Do not forget that the Web is now loaded with infections similar to the Guer ransomware. For example, this specific risk is generally identical to Brusaf and other ransomware-type infections. These harmful utilities have been established in order to encrypt the important information and express the need for the users to pay the ransom. All these infections utilize the identical algorithm to produce the particular key for effective information decryption.

Unless the Guer ransomware is still under the advancement procedure or has actually got some hidden bugs, it is not possible to bring back the information manually. Therefore, the only working option to avoid the loss of your essential data is to regularly maintain current backups of all your crucial data.

Another crucial piece of recommendations is to keep the backups on unique storage not connected to your main computer. For example, you may keep it on the USB Flash Drive, or some external hard disk drive, or by using the cloud data storage services. Keeping the backups on your regular drive is very dangerous, given that the backup might also be encrypted by the Guer .

Leaks for the Guer ransomware attack.

Guer utilizes lots of paths to penetrate the vulnerable computers. It is not certain what specific approach was utilized in your case, however, the intrusion might occur by means of the following channels:

  • bundling with third-party programs, primarily free software;
  • spam emails from the unknown senders;
  • sites providing complimentary hosting;
  • P2P (peer-to-peer) torrent software.

There are times when the Guer might disguise itself as some authentic application, for example, through the deceptive alerts demanding installation of some software upgrade. This is the most typical trick utilized by the scams to inject the Guer ransomware files into the system. This way users partly take part in its setup, without clearly comprehending the risk.

In addition, the frauds might send unsolicited spam email with tricky alerts motivating the people to open suspicious accessories or click some download links, for instance, those motivating the people to open particular photos, text files, tax files and other info.

No doubt, opening these files or clicking on the malicious links may basically damage the system. Fake Adobe Flash Player upgrade alerts may result in the Guer ransomware infiltration. Similarly, downloading the cracked software application may in addition consist of the ransomware installer. The last but not the least, installation of Guer might occur through some Trojan horses that may be set up stealthily into the system and without the user’s direct approval and even approval.

Avoiding the Guer ransomware injection.

Naturally, there is no outright guarantee that your computer system will be always free of any malware attacks, nevertheless, we want to share some useful pointers with you to make it safer. Make certain to pay very attention while searching the web and particularly while downloading cost-free programs. Do not open any suspicious e-mail attachments, particularly if the sender is not understood to you.

Do not forget that particular freeware installer might also contain some other extra apps in the bundle. These additional applications might be very destructive. It is of utmost significance to keep your anti-virus software and your operating system in general to be always properly upgraded.

It is quite sensible that downloading cracked apps is prohibited, however, furthermore, such unauthorized software use might also bring severe damage to your system. Thus, do not download any cracked programs. Plus, the fact that your current anti-virus did not secure the system from the Guer ransomware is an excellent factor for you to reconsider your options and change to another program that can render the safeguarding functions on a much better level.

Below please find the quotation from the Guer text file:

 Don't worry, you can return all your files!
 All your files like photos, databases, documents and other important are encrypted with strongest encryption and unique key.
 The only method of recovering files is to purchase decrypt tool and unique key for you.
 This software will decrypt all your encrypted files.
 What guarantees you have?
 You can send one of your encrypted file from your PC and we decrypt it for free.
 But we can decrypt only 1 file for free. File must not contain valuable information.
 You can get and look video overview decrypt tool:
 Price of private key and decrypt software is $980.
 Discount 50% available if you contact us first 72 hours, that's 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 answer more than 6 hours.
 To get this software you need write on our e-mail:
 Reserve e-mail address to contact us: 

 Our Telegram account:

Screenshot of files with “.guer” extension added by the ransomware:”

Guer Ransomware - encrypt files with .guer extension

Use GridinSoft Anti-Malware to remove Guer ransomware from your computer

1.Download GridinSoft Anti-Malware.

You can get GridinSoft Anti-Malware by clicking the button below:

  GridinSoft Anti-Malware

2. Double-click on the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-ag.exe file to install GridinSoft Anti-Malware on your computer.
GridinSoft Anti-Malware
An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.
GridinSoft Anti-Malware Setup

3. Press Install button for run GridinSoft Anti-Malware.

GridinSoft Anti-Malware Install

3.Once installed, GridinSoft Anti-Malware will automatically run.

GridinSoft Anti-Malware  Start

4. Wait for the GridinSoft Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your computer for Win Speedup 2018 and other malicious programs. This process can take a 20-30 minutes, so we suggest you periodically check on the status of the scan process.
GridinSoft Anti-Malware Scan

5. Click on “Clean Now”.

When the scan has completed, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.
GridinSoft Anti-Malware Scan Result

Use Emsisoft Decryptor for restore guer files

You can get Emsisoft Decryptor by clicking the button below:

  Emsisoft Decryptor

  1. Run the decryptor as an administrator. The license terms will show up, which you have to agree to by clicking the “Yes” button.
  2. Once the license terms are accepted, the primary decryptor user interface opens.
  3. By default, the decryptor will pre-populate the locations to decrypt with the currently connected drives and network drives. Additional locations can be added using the Add” button.
  4. Decryptors typically offer various options depending on the particular malware family. The available options are located in the Options tab and can be enabled or disabled there. You can find a detailed list of the available Options below.
  5. After you have added all the locations you want to decrypt to the list, click the “Decrypt” button to start the decryption process. The screen will switch to a status view, informing you about the current process and decryption status of your files
  6. The decryptor will inform you once the decryption process is finished. If you require the report for your personal records, you can save it by clicking the “Save log” button. You can also copy it straight to your clipboard to paste it into emails or forum posts if you are asked to.
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Daniel Zimmermann

Daniel Zimmermann has been writing on security and malware subjects for many years and has been working in the security industry for over 10 years. Daniel was educated at the Saarland University in Saarbrücken, Germany and currently lives in New York.

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