GCYI Ransomware. How to decrypt .gcyi files?

If you can’t open your photos, documents, or other files and see the .gcyi extension on them, your computer is definitely infected with Gcyi ransomware. It pertains to STOP/Djvu ransomware group

Gcyi ransomware encrypts personal documents found on the victim’s PC with the extension “.gcyi” and after that generates the ransom note in each folder which contains encrypted files. The instructions are put on the victim’s desktop in the “readme.txt” file. Its task is generally comparable to other examples of the same ransomware family: Eucy, Ckae, Naqi.

What is Gcyi Ransomware?

NameGcyi Virus
Ransomware family1DJVU/STOP2 ransomware
Extension.gcyi
Ransomware note_readme.txt
RansomFrom $490 to $980
Contactmanager@mailtemp.ch, helprestoremanager@airmail.cc
SymptomsThe images, videos, and other documents have the “.gcyi” extension and cannot be opened by any programs
Fix Tool Trojan Killer – ransomware infections tool. 14-day free trial.

Gcyi is file-encrypting ransomware that prevents normal access to your text files, Excel tables, videos and pics by encrypting them. It marks the ciphered files with the “.gcyi” extension. Then Gcyi ransomware adds a money ransom note (readme.txt) to each folder. In it, you can see the guidance to pay the ransom ($490-$980 in Bitcoin) to a certain Bitcoin address. The AES-256 or RSA-1028 cipher it uses to cipher the files is not decryptable with contemporary computers. Even quantum PCs that currently exist will spend thousands of years to find the decryption key.

How dangerous is the Gcyi ransomware?

When Gcyi ransomware gets in your system, it will examine your computer for photos, videos, and also important documents. It encrypt] all widespread file formats- .psd, .doc, .docx, .xls, .xlsx, .pdf, .jpeg, .png, et cetera. When these documents are found, the ransomware will encrypt them and also change their extension to “.gcyi” so that you understand what happened.

After the Gcyi ransomware ciphered the files on your computer, it will generate the last “readme.txt” file on the main screen. Besides the money transferring instructions, the victims also see the emails to contact the crooks – helprestoremanager@airmail.cc and manager@mailtemp.ch.

Here is the ransom note that the Gcyi ransomware shows to its victims:

ATTENTION!

Don't worry, you can return all your files!
All your files like pictures, 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:
https://we.tl/t-fhnNOAYC8Z
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:
manager@mailtemp.ch

Reserve e-mail address to contact us:
helprestoremanager@airmail.cc

How did the Gcyi ransomware get on my computer?

The Gcyi ransomware spreads by posting websites to get hacked programs or games. Cybercriminals that spread this ransomware are extremely foxy, and try to stay connected with modern things. New games releases, new popular movies – Gcyi developers make whatever to get their victims on that. One of the most popular strategies these criminals use is one-day sites with torrent downloading links. Nevertheless, pursuing the current trends is not the only manner these criminals use. Methods that have already become classic, such as email spamming, are also common for STOP/Djvu ransomware spreading.

Malicious email spam
The example of email spamming that may lead to Gcyi ransomware injection

Avoiding this ransomware does not need a lot of initiative. Using the standard principles of computer hygiene will significantly decrease all risks. Bear in mind that launching all documents you receive on email is not a great habit. Even worse scenario is to allow macros in Microsoft Office files. But it is much better to prevent the malware attack at the moment when you have just opened the e-mail message. Inspecting the sender’s address can say a lot about what you can expect, and also when you see the thing like “support@amazon.com”– it is likely a trustworthy email. At the same time, stuff that tries to resemble Amazon or FedEx shipment alert, but uses the e-mail address of “amazonspurrot1363@gmail.com”– should make you get on the alarm. Above, you can see the example of such a message.

Illegal sources of different digital things require some extra explanation. Violating copyright regulation already throws you to the possibility of being fined. However, utilizing torrent trackers or third-party sites to download “free” programs also exposes you to a wide range of malware. Nobody can control undisclosed individuals that launch the torrent seeding or release the hacked program version on the website with pirated program.

Gcyi virus removal instructions.

Download Trojan Killer Portable

Trojan Killer Portable Download

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This guide below shows how to use Trojan Killer Portable3 for Gcyi virus detection and removal:

  • STEP 1. Download and install Trojan Killer.

  • STEP 2. Click on "Finish".

  • STEP 3. Wait until necessary updates are downloaded and installed.

  • STEP 4. Select computer scan type.

  • STEP 5. The software will begin scanning your computer.

  • STEP 6. Click on "Cure PC".

Restore the files encrypted by the Gcyi ransomware

In most cases, it’s impossible to recover the files encrypted by the Gcyi ransomware because the private key needed to unlock the encrypted files is only available through cybercriminals. However, we’ve listed one option you can use to recover your files below.

Warning! Make sure you remove the ransomware from your system first, otherwise, it will repeatedly encrypt your files.

If your files were encrypted with an offline key, there is a chance you can recover them by using Emsisoft Decryptor for the STOP/Djvu decryption tool. Follow the below guide to recover your files using the Emsisoft Decryptor for STOP/Djvu.

  1. You can download Emsisoft Decryptor for STOP Djvu by clicking this link.
  2. When the decryptor has finished downloading, double-click on “decrypt_STOPDjvu.exe” to run this program on your computer.
  3. Click the “Decrypt” button to start the decryption process for Gcyi files. The screen will switch to a status view, informing you about your files’ current process and decryption status.
  4. The decryptor will inform you once the decryption process will be finished. If you require the report for your records, you can save it by clicking the “Save log” button.

If the Emsisoft Decryptor can’t decrypt your .gcyi files and you do not plan on paying the ransom, it is advised that you make an image of the encrypted drives so that you can decrypt them in the future.

Your computer should now be free of the Gcyi ransomware infection. However, suppose your current antivirus allowed this malicious program on your computer. In that case, you might want to consider purchasing the full-featured version of Trojan Killer to protect against these types of threats in the future.

GCYI Ransomware — How To Remove Virus & Decrypt Files?

Name: GCYI Virus

Description: GCYI Virus is a STOP/DJVU family of ransomware-type virus. It encrypts files, video, photos, documents. Encrypted files can be tracked by a specific gcyi extension. GCYI ransomware asks victims for a ransom fee about $490 - $980 in Bitcoin.

Offer price: 480

Currency: $

Operating System: Windows

Application Category: Virus

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  1. My files are encrypted by ransomware, what should I do now?
  2. About DJVU (STOP) Ransomware: https://gridinsoft.com/ransomware/djvu
  3. More about Trojan Killer: https://gridinsoft.com/trojankiller

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About William Reddy

I am from Ireland. My parents bought me a computer when I was 11, and several months after I have got a virus on this PC. I decided to enter the INSA Centre Val de Loire university after being graduated from the school. This French educational institution was offering a brand-new cybersecurity course. After getting the master's degree in cybersecurity, I've started working as a virus analyst in a little anti-malware vendor.