GOG Ransomware

Also Known As: .L0CKED virus
Distribution: Low
Damage level: <strong>Severe</strong>

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Description Removal Prevention

GOG ransomware removal instructions

What is GOG?

GOG is ransomware-type malware designed to encrypt files using RSA-4096 cryptography. During encryption, GOG appends the ".L0CKED" extension to the name of each file. For example, "sample.jpg" is renamed to "sample.jpg.L0CKED". Following successful encryption, GOG changes the desktop wallpaper and creates a text file ("DecryptFile.txt"), placing it on the desktop. The file contain a ransom-demand message.

The message states that files are encrypted using asymmetric cryptography and that they can only be restored using a unique private key. Unfortunately, this information is accurate. RSA-4096 is an asymmetric encryption algorithm and, thus, public (encryption) and private (decryption) keys are generated during the encryption process. Developers store the private key on a remote server and generate revenue by selling it to victims. To submit payment, victims must follow the instructions provided on GOG's website (link provided in the ransom-demand message). The cost of decryption is .3 Bitcoin (approximately $305), however, it is also stated that payment must be submitted within a certain time frame (which is not specified), otherwise the price will double. If the ransom is not paid within the time frame, the private key is permanently deleted and decryption becomes impossible. In any case, never trust cyber criminals. Research shows that these people often ignore victims, despite payments made. Never pay any ransom or attempt to contact these people. It is highly probable that paying will not deliver any positive result - you will simply be scammed. There are currently no tools capable of cracking RSA-4096 cryptography and restoring files compromised by GOG ransomware. Therefore, the only solution is to restore your files/system from a backup.

Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:

GOG decrypt instructions

GOG shares many similarities with dozens of other ransomware-type viruses. As with GOG, malware such as Erebus, OpenToYou, EdgeLocker, and many others, also encrypt files and make ransom demands. Cost of decryption and type of encryption algorithm (symmetric/asymmetric) used are the only major differences between these viruses. Cyber criminals often proliferate ransomware via trojans, fake software update tools, spam emails (malicious attachments), and third party software download sources (peer-to-peer networks, freeware download and free file hosting websites, etc.) Therefore, use a legitimate anti-virus/anti-spyware suite and keep installed applications up-to-date. Furthermore, be cautious when opening files received from suspicious/unrecognizable emails and downloading software from unofficial sources. Poor knowledge and careless behavior is often the reason for computer infections. The key to computer safety is caution.

Text presented within GOG wallpaper and text file:

WARNING!!!
what happened to your files?
All of your files were protected by a strong encryption with RZA4096
More information about the encryption keys using RZA4096 can be found here: en.wikipedia.org/wiki/RSA_(cryptosystem)
How did this happen?
Specially for your PC was generated personal RZA4096 key, both public and private.
All your files were encrypted with a public key, which has been transferred to your computer via the Internet.
Decrypting of your files is only possible with the help of the private key and de-crypt program, which is on our secret server.
What do i do?
So, there are two ways you can choose: wait foe a miracle and get your price doubled, or start obtaining BITCOINS NOW!, and restore your data easy way.
If you have really valuable data, you better not waste your time, because there is no other way to get your files, except make a payment.
Your personal ID: Open DecryptFile.txt
For more specific instructions please visit your personal home page, there are a few different addresses pointing to your page below.

Screenshot of GOG ransomware Tor website:

GOG decrypt instructions

Text presented within GOG website:

Your files are encrypted.
You did not pay in time for decryption, that's why the decryption price increases 2 times.
At the moment ,the cost of decrypting your files is 0,3 Bitcoin.
In case of failure to 10.01.2017 your key will be deleted permanently and it will be impossible to decrypt yoour files.

1. You can make a payment with BitCoins,there are many methods to get them.
2. You should register Bitcoin wallet (Simplest Online Wallet)
3. Purchasing Bitcoins - Although it's not yet easy to buy bitcoins,it's getting simpler every day.
Here are our recommendations:

LocalBitcoins.com - Service allows you to search for people in your community willing to sell bitcoins to you directly(WU,Cash,SEPA,PayPal and many others).
BTC-e.com - BTC dealer , VISA/MasterCard and etc.
CoinCafe.com - the simplest and fastest way to buy and sell Bitcoins.
BTCDirect.eu - the best for Europe.
CEX.io - Visa / MasterCard.
CoinMama.com - Visa / MasterCard.
HowToBuyBitcoins.info - discover quickly how to buy and sell bitcoins in your local currency.

4. Send 0,3 Bitcoin to the following Bitcoin address:
135kMQ7eh9P6CfbyddVMfhXSjo4C7tep2T
5. After you have made the payment, fill out the fields below to receive Decryptor and DecryptionKey.

Screenshot of files encrypted by GOG (".L0CKED" extension):

GOG decrypt instructions

GOG ransomware removal:

Quick menu: Quick solution to remove .L0CKED virus

Step 1

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

Step 2

Log in to the account infected with the GOG virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.


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Remover for .L0CKED virus

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If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the GOG ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining GOG ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of GOG are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by GOG, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and Malwarebytes Anti-Ransomware, which artificially implant group policy objects into the registry to block rogue programs such as GOG ransomware.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove GOG ransomware:

About the author:

I am passionate about computer security and technology. I have an experience of 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an editor for pcrisk.com since 2010. Follow me on Google+ to stay informed about the latest online security threats.

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