BigLock or corona-lock is a file-encrypting malware program. Being a ransomware, it is designed to encrypt important data on the target system in order to demand ransom against decryption key. The ransomware threat is discovered by GrujaRS.

After that, the encrypted files are appended with the “.corona-lock” extension. Thus, any file originally named as “myhome.jpg,” will appear as”myhome.jpg.corona-lock” after encryption. Once the process the complete, it creates a ransom note named as “README_LOCK.TXT.” 

BigLock Ransomware Description

Name BigLock ransomware
Type Ransomware, file-encrypting malware
Risk level High
Description BigLock is a ransomware program that encrypts files, photos, videos and other important documents on the target system with unique key. If user wants to recover their files then have to pay the ransom.
Occurrence Opening spam email attachments, Visiting suspicious pages and clicking on malicious links,  Browser Redirection to questionable sites or via other Trojans.
 Symptoms Restrict access to most of the files on the system, Change in desktop wallpaper, ransom message.
Extension .corona-lock
Ransom Note README_LOCK.TXT
Ransom Demanded ????
Email or contact support@covidworldcry.com
Detection

Download the Anti-ransomware toolTo quickly eliminate BigLock Ransomware from your computer.

Method Of Propagation

Most commonly, the malicious payloads is distributed using spam emails, software cracking tools, pirated software downloads and so on.

Such emails subjects as any invoice, fax, job offers or from any higher officials of the company. Also, the situation of CONVID-19 crisis, it ,may also spread spam email related to any latest information about the pandemic to trick users opening the spam emails.

So, once the user opens the infected attachment, the macro-enabled document starts automatically running the macros. This downloads the infectious files on the system and further install it on the system.

Besides that, there are other sources too. For instance, downloading pirated software, security flaws within the software, fake updates and exploit kits. Any of these can be responsible for infecting your system with BigLock Ransomware.

The Encryption Process

Once the malware is installed, the BigLock ransomware uses Chacha + AES, encryption algorithm to encrypt the files on the target system. The files includes all types of documents, photos, videos, apps on the system. The aim behind is to demand the ransom to be paid in order to buy the decryption key from the authors of the threat. After encryption, the files are replaced with “.corona-lock” extension, the full pattern of the encryption is “originalfilename.corona-lock” extension.

For example, if a file named “home.jpg” would appear as “home.jpg.corona-lock“. Thus all the files will be replaced likewise which will be no more accessible. After the completing the encryption, it generates a ransom note containing the contact details of the authors along with unique ID for the victim.

The Ransom Note

After the encryption is completed, the ransomware creates a random note to inform users about the encryption and how they can recover their files. The note is named as “README_LOCK.TXT” which can be found in each of the folder where encryption occurred and within the desktop screen.

BigLock or corona-lock Ransomware

BigLock or corona-lock Ransomware

The Text within the Ransom Note is:

YOUR FILES WERE ENCRYPTED
AND MARKED BY EXTENSION .corona-lock


DON’T WORRY! YOUR FILES ARE SAFE! ONLY MODIFIED :: ChaCha + AES
WE STRONGLY RECOMMEND you NOT to use any Decryption Tools.
These tools can damage your data, making recover IMPOSSIBLE.
Also we recommend you not to contact data recovery companies.
They will just contact us, buy the key and sell it to you at a higher price.
If you want to decrypt your files, you have to get RSA private key.

To get RSA private key you have to contact us via email to:
—————————->> support@covidworldcry.com <<
and send us your id: >> – <<

HOW to understand that we are NOT scammers?
You can ask SUPPORT for the TEST-decryption for ONE file!

Here are few point concluded from the ransom note:

  • Files on the target system is encrypted.
  • Authors informs users not use any other decryption tools
  • In order to restore the files, users need to contact to the authors with provided email ID support@covidworldcry.com.
  • Victims can send 1 file as test decryption.

How To Remove BigLock Ransomware virus Without Paying Ransom

However, security experts never recommend paying the ransom, as the extortionist does not have any guarantee to provide the full-decryption key even after paying the ransom. Besides that, paying the ransom encourage such crimes and earn profit by illegal ways. Thus, you should remove the BigLock ransomware threat and try out other recovery methods given below. It it better to keep a backup of all your important files safety to fight against such threats. Before starting the removal, you should keep a copy of encrypted files along with ransom note in a separate flash drive.

Method 1: Remove BigLock Ransomware Virus Using Safe Mode With Networking.

In this guide, you will find removal instruction of BigLock Ransomware virus both manually and using anti-malware tool. However manual removal of ransomware threats are nearly impossible, so it is better to run a scan with anti-ransomware/malware to remove the virus.

At times, virus does not allow the installation or scanning of anti-virus program, so you need to switch to “safe mode with networking”. After that you can try recovery of your data if you have any backup or we have listed some methods which may help you to recover some of your data.

For Windows XP and 7:

  1. Click on the “Start menu, then on click the arrow next to “Shut Down.” Select Restart. (Just as you normally Restart your PC).
  2. Once the computer screen is powered on, immediately start tapping “F8” key till you see “Advanced Boot Options” screen. if you don’t enter to the boot screen, then restart the process again and press F8 while the PC is restarting.
  3. Here, you need to choose “Safe Mode with Networking option and press “enter” key to troubleshooting windows. As later on, you need to access the internet.
    Safe Mode With Networking

    Safe Mode With Networking

  4. And you will now see the login screen. Now log in with your Administrator Account.

NOTE: To get back to your normal windows configuration, you need to repeat steps 1-3 and select Start Windows Normally.

  1. For Windows 10: Click Start –> Power and then hold the Shift key on your keyboard and click Restart.
  2. For Windows 8/8.1:  Press the “Windows key + C“, and then click “Settings“. Click “Power“, hold down the Shift key on your keyboard and then click “Restart“.
  3. From here steps are same for Windows 10 and 8.
  4. Click Troubleshoot.
    Choose Troubleshoot

    Choose Troubleshoot

  5. Click Advanced options.
    Choose Advanced Options

    Choose Advanced Options

  6. Click Startup Settings.
    Choose Start-up Setting

    Choose Start-up Setting

  7. Click Restart.
    Press Restart

    Press Restart

  8. After your computer restarts, select Safe Mode with Networking.
    Windows 10 Safe Mode With Networking

    Windows 10 Safe Mode With Networking

  9. Enter your Administrative username and password to start Windows in Safe Mode with Networking.

NOTE: To get back to normal Windows configuration you need to Click Start –> Power and then click Restart.

Now Download the anti-malware program to detect and remove BigLock Ransomware.


Use HitmanPro.Alert To Remove BigLock Ransomware(Recommended)”

HitmanPro.Alert

HitmanPro.Alert is an advanced anti-malware program along with anti-ransomware features. That helps detecting the encrypted files and presence of any ransomware threats. Running HitmanPro.Alert on your computer will provide your real-time status, checks the browser integrity and alerts or any suspicious activity. So that you can have a safe browsing and online transactions. Read the full review of HitmanPro.Alert here.

Steps To Install And Run HitmanPro.Alert

  • Click on the provided link to download HitmanPro.Alert anti-malware;
    HitManPro.Alert Step1

    HitManPro.Alert Step1

  • Now, open the download folder to locate “hmpalert3”;
    HitmanPro.Alert Step 2

    HitmanPro.Alert Step 2

  • Click on it, to begin the installation;
  • It will ask your User Account control, if prompted click on “yes”; The download should begin shortly. HitmanPro.Alert window will appear, where you need to choose the options:
HitManPro.Alert Step3

HitManPro.Alert Step3

  • Choose Protection level as Maximum
  • And tick the other boxes and finally click on “Install”.
  • HitmanPro.Alert only takes 5MB of your memory and is very quick to install.
HitManPro.Alert Step4

HitManPro.Alert Step4

  • After the installation is complete, the scan will start. First scan may take up some minutes, as it will scan the whole computer.
    HitmanPro.Alert step 4

    HitmanPro.Alert step 4

  • The scan results are here. Carefully look down the list. You can here, the scan has found 1 Riskware and thousands of traces which can be risky.
    HitmanPro.Alert step 5

    HitmanPro.Alert step 5

  • You can select the threat to delete, quarantine, ignore or, mark as safe. If you want to remove all the threats, then simply click on the “Next” button below.
    HitmanPro.Alert step 6

    HitmanPro.Alert step 6

  • HitmanPro.Alert first creates a restore point and then starts the removal process. This helps to recover from any damage.
    HitmanPro.Alert step 7

    HitmanPro.Alert step 7

So, by performing the above steps, you can get rid of BigLock Ransomware.


Method 2: Remove BigLock Ransomware virus using System Restore Procedure

Another method is a manual way to get rid of Ransomware which is through System Restore. If you don’t know much about this process, then read here. Click here to perform System Restore in Windows OS.

Safe Mode with Command Prompt (Follow the above steps and choose Safe Mode with Command Prompt option from boot settings

To Reboot your computer to “Safe Mode with Command Prompt”

Windows 7 / Vista / XP

  • Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart.
  • Now select Troubleshoot –> Advanced options –> Startup Settings and finally press Restart.
  • Once your computer becomes active, select “Enable Safe Mode with Command Prompt” in Startup Settings window.

Windows 10 / Windows 8

  • Click Start –> Restart –> OK.
  • When your computer becomes active, start pressing “F8″ multiple times until you see the Advanced Boot Options window.
  • Select Command Prompt from the list

To Restore your system to default settings as it was prior to the attack of BigLock Ransomware

  1. Once the Command Prompt window appears, type “cd restore” and press Enter.
  2. Now again type “rstrui.exe” and hit Enter button;
  3. It will show up a new window, now click on “Next” and select your restore point that should be prior to the attack of BigLock threat or any other point you want. Click on “Next”.
  4. Now click on “Yes” to confirm the system restore.

Restore-your-system-to-default-settings

Once the system restore to your selected date is done, then you need to restart your computer normally.

You should Download effective anti-virus program and scan your computer to ensure successful removal of any threat.


How to Restore the Encrypted Files by BigLock Ransomware?

Here is a separate article that guides users of various methods to recover their encrypted files. However, the ransomware makes sure the files may not be unlocked by other tools, but you should try them out.

Click here to know How you can restore the encrypted file.

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