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Krab ransomware. How to remove? (Uninstall guide)

removal by Lucia Danes - - | Type: Ransomware

KRAB – dangerous ransomware that belongs to an infamous GandCrab family and its 4th version 

Krab ransomware
Krab ransomware virus is one of the most severe cyberthreats that extort money from innocent victims.
 

KRAB is a dangerous ransomware[1] that typically encrypts files and marks them with .KRAB file extension. The main purpose of the virus is to extort money out of victims by making them believe that their files will be unavailable for the use until they pay the demanded ransom. These hackers are deemed to be from Romania and are responsible for GandCrabGandCrab v2, GandCrab v3GandCrab v4 and, most recently, GandCrab v5 ransomware creation and distribution. This particular cyber infection is a part of its 4th variant which is also known to drop either CRAB-DECRYPT.txt or KRAB-DECRYPT.txt file in every folder with infected data. Once opened, this file turns out to be a ransom note that informs victims that their machines were infected by .krab files virus and, to retrieve the access to their data, they need to pay the ransom in Dash or Bitcoin cryptocurrency.

Name Krab ransomware
Type Cryptovirus
Version of GandCrab ransomware
Encryption methods Salsa20 and RSA-2048
File extension .KRAB
Ransom note CRAB-DECRYPT.txt or KRAB-DECRYPT.txt
Distribution Infected spam email attachments
Elimination Use Reimage for Krab ransomware removal

If you were unlucky enough to get infected with KRAB and did not prepare data backups previously, you are in a tough position. Security experts claim[2] that paying the ransom is not an option, as you might end up losing not only your personal files but also money. Hackers use unfair techniques to extort money, so they might also never contact you after the payment is transferred. 

The only goal of these hackers is to get your money. Bitcoin or DASH is the preferred cryptocurrency, as it allows anonymous transfers. In some cases, crooks demand as little as $50 for file decryption. However, .krab ransomware developers ask for $800-1200, which is a tremendous amount in comparison. 

When the data-locking process is successful, and the identification key is formed for each victim, ransomware contacts C2 server and downloads ransom note CRAB-DECRYPT.txt or KRAB-DECRYPT.txt into victim's computer which consists of the following message:

—= GANDCRAB V4 =—
Attention!
All your files, documents, photos, databases and other important files are encrypted and have the extension: .KRAB
The only method of recovering files is to purchase an unique private key. Only we can give you this key and only we can recover your files.
The server with your key is in a closed network TOR. You can get there by the following ways:
____________________________________________________________________
| 0. Download Tor browser – https://www.torproject.org/
| 1. Install Tor browser
| 2. Open Tor Browser
| 3. Open link 
| 4. Follow the instructions on this page
____________________________________________________________________

On our page you will see instruction and get the opportunity to decrypt 1 file for free.
ATTENTION! 
IN ORDER TO PREVENT DATA DAMAGE:
* DO NOT MODIFY ENCRYPTED FILES
* DO NOT CHANGE DATA BELOW
—BEGIN GANDCRAB KEY—

—END GANDCRAB KEY—
—BEGIN PC DATA—

—END PC DATA—

The developers of KRAB suggest to send them one file for test decryption so that you would make sure that their decryptor works. However, do not risk it as they might send you back malware instead of a promised decrypted file. The best solution for file recovery is either using a backup or extract the data from third-party software – you can find all the instructions below. Remember that you need to perform full KRAB removal before you attempt to recover your files.

To remove KRAB ransomware, use powerful security software, and do not even try to eliminate it manually, as the virus is complicated and would require a professional for such action. Instead, download Reimage or Malwarebytes MalwarebytesCombo Cleaner and perform full system scan in Safe Mode with Networking. Only after that, you can proceed with the file recovery procedure.

Ransomware distribution methods: from spam emails to exploit kits

The main distribution method for dangerous malware like ransomware is spam emails. Phishing[3] email campaigns are often distributed by employed bots and reach thousands, if not millions of users worldwide. Those who unknowingly (or carelessly) open the attachment or click on a malicious hyperlink, start the virus infection procedure immediately.

There are a few other ways hackers use to distribute ransomware-type viruses. Exploit kits can be used to spread severe infections like ransomware. There also a are incidents when ransomware infections come to the system by breaking through unprotected RDP.

The best way to avoid this cyber infection is to pay more attention and take precautionary measures to make your system more secure. The main tip you need to remember is to keep applications up to date and pay more attention to which emails you open first without thinking.

Get rid of KRAB ransomware before it starts second encryption

To remove KRAB ransomware from the device, you need to employ tools like Reimage, Malwarebytes MalwarebytesCombo Cleaner, Plumbytes Anti-MalwareMalwarebytes Malwarebytes or another anti-malware program. You need to get rid of the infection promptly in order to attempt file recovery procedure. If you start this task earlier, the virus can initiate yet another encryption of your data.

However, KRAB ransomware removal can be hindered by the malware. In such case, we advise you to reboot your PC and enter Safe Mode with Networking. This mode loads only the necessary drivers and processes for the launch, rendering the virus non-functional. From there, you can operate anti-malware software without much trouble.

While most ransomware tries to eliminate Shadow Volume copies, .krab files virus might fail to do so. Thus, using third-party software in such a case would save all your files.

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What to do if failed?
If you failed to remove virus damage using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to remove virus damage. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with Malwarebytes.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with Combo Cleaner.

To remove Krab virus, follow these steps:

Remove Krab using Safe Mode with Networking

As your first step in Krab ransomware removal, try rebooting your device in Safe Mode with Networking:

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove Krab

    Log in to your infected account and start the browser. Download Reimage or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete Krab removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove Krab using System Restore

The second method can be System Restore feature:

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of Krab. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage and make sure that Krab removal is performed successfully.

Bonus: Recover your data

Guide which is presented above is supposed to help you remove Krab from your computer. To recover your encrypted files, we recommend using a detailed guide prepared by 2-spyware.com security experts.

If your files are encrypted by Krab, you can use several methods to restore them:

Data Recovery Pro can help if you haven't backed your files before the attack

Data Recovery Pro can restore accidentally deleted or encrypted files

  • Download Data Recovery Pro;
  • Follow the steps of Data Recovery Setup and install the program on your computer;
  • Launch it and scan your computer for files encrypted by Krab ransomware;
  • Restore them.

Windows Previous Versions feature could be helpful if you have no backups

Restore Krab ransomware encrypted files with Windows Previous Versions feature if System Restore was enabled before

  • Find an encrypted file you need to restore and right-click on it;
  • Select “Properties” and go to “Previous versions” tab;
  • Here, check each of available copies of the file in “Folder versions”. You should select the version you want to recover and click “Restore”.

ShadowExplorer recovers Shadow Volume Copies

Unfortunately, if Krab ransomware deleted the Shadow Volume Copies, you couldn't use ShadowExplorer to recover them

  • Download Shadow Explorer (http://shadowexplorer.com/);
  • Follow a Shadow Explorer Setup Wizard and install this application on your computer;
  • Launch the program and go through the drop down menu on the top left corner to select the disk of your encrypted data. Check what folders are there;
  • Right-click on the folder you want to restore and select “Export”. You can also select where you want it to be stored.

There is no official decryption tool

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Krab and other ransomwares, use a reputable anti-spyware, such as Reimage, Malwarebytes MalwarebytesCombo Cleaner or Plumbytes Anti-MalwareMalwarebytes Malwarebytes

About the author

Lucia Danes
Lucia Danes - Virus researcher

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References

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