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GandCrab v4.1 ransomware. How to remove? (Uninstall guide)

removal by Jake Doevan - - | Type: Ransomware

GandCrab v4.1 – ransomware that showed up quickly after its predecessor

GandCrab v4.1 ransomware
GandCrab v4.1 is a ransomware that added network communication feature

GandCrab v4.1 ransomware is a crypto-virus and a continuation of the infamous GandCrab v4 ransomware. It encrypts files using a complicated encryption algorithm and adds a .krab appendix to each of the affected files. The data locker does not modify wallpaper but drops a ransom note in the text format in each of the affected folders – krab-decrypt.txt. Hackers demand to pay the ransom of $1200 in DASH cryptocurrency for data release. The main difference from its previous variant is that the virus added network communication feature.[1] Additionally, the GandCrab v4.1 ransomware does not use the Command and Control server anymore, allowing it to spread without the internet connection.

SUMMARY
Name GandCrab v4.1
Type Ransomware
Family GandCrab
File extension .krab
Ransom note krab-decrypt.txt
Ransom size $1200 in DASH, might double
Symptoms Ransom note present in each of the affected folders and files appear to have .krab appendix
Detection and elimination Use Reimage or Plumbytes Anti-MalwareMalwarebytes Malwarebytes

According to security experts, GandCrab v4.1 virus is mostly distributed through fake websites that look identical to those that host cracked software, keygens, and similar. Nevertheless, as it is typical of data encrypting viruses, they can also spread via spam emails, break through the RDP, and similar methods. 

There have been speculations that GandCrab v4.1 crypto-malware spreads via SMB exploit, which was used by WannaCry and Petya cyber attacks, although security experts did not find any evidence for that. However, they did not reject the possibility that the feature could be introduced in the next malware version. Therefore, users should make sure that the MS17-010[2] patch is implemented on their machines.

To ensure encryption of files, GandCrab v4.1 kills several .exe processes, allowing malware to execute its purpose successfully. The virus targets a variety of files, such as:

  • MS Office/OpenOffice documents
  • Archives
  • Databases
  • Photos
  • Video
  • Image
  • Music, etc.

As soon as the .krab extension is added to each of personal files, they become unusable. Note that they are not damaged, but encoded. To get them back, users need to obtain decryption key that is stored on a remote server which is only accessible to cybercriminals. Nevertheless, users should ignore hackers and take care of GandCrab v4.1 removal first – we recommend using anti-malware software such as Reimage or Plumbytes Anti-MalwareMalwarebytes Malwarebytes instead of trying to eliminate the threat manually. Victims can then proceed to retrieve personal data using backups or third-party applications. 

GandCrab v4.1 ransomware as a long list of hard-coded websites it communicates with to send out the information about victims. The malware generates an URL address for each host in the following format: http://{host}/{word1}/{word2}/{fname}.{extension}, for example: www.{host}.com/uploads/pics/potekim.gif. This functionality does not seem logical, as sending data of the victim to each of the hosts seems useless, considering one send-off would be enough to fulfill the purpose.

Additionally, the hard-coded websites were not designed to act as GandCrab servers or the virus carriers. Therefore, security experts think that this functionality is experimental or is only there to divert researchers from the correct analysis.

A ransomware-type virus is hazardous and can lead to permanent loss of personal data. Nevertheless, to ensure normal operation of the PC, users should hurry and remove the GandCrab v4.1 virus from their computers by using reputable security software.

Be careful online and avoid nasty ransomware infections

When it comes to internet safety, users are not careful. At least not careful enough. Even though ransomware has been one of the most elaborated topics when it comes to cybersecurity (we saw massive attacks last year – WannaCry and NotPetya, which brought several high-profile organizations to the knees), users still refuse to believe that they can be victims, and so do companies. They fail to patch their computer systems on time or fall for a cleverly presented phishing email.

Do not forget that, ransomware targets both, organizations and private users. Therefore, do not exclude yourself as a potential victim. Always use strong passwords, install powerful security software, update the software and the OS as soon as new patches are out, and learn to recognize malicious spam emails.

Remove GandCrab v4.1 ransomware using security software

Ransomware-type viruses use a complicated code that might lead to permanent data loss. You need to realize, that manual GandCrab v4.1 removal should not be performed by regular users, as it will end up in a failure. Only trained and highly skilled IT professionals would be able to execute such a task. Therefore, leave it for security software – Reimage or Plumbytes Anti-MalwareMalwarebytes Malwarebytes will work, although you can use any anti-malware program of your liking.

GandCrab v4.1 virus stops certain executable files, so it might prevent security software from starting and operating correctly. In such case, enter Safe Mode with Networking, as explained below. You can also use a video guide that explains how to create a safe environment before you start performing the removal procedure.

Note that you should start recovering your encrypted files only after you remove GandCrab v4.1 from the infected machine. Otherwise, your files will get encrypted again. To recover data, use backups or alternative methods. 

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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.
More information about this program can be found in Reimage review.

If you decided to select another anti-spyware, uninstall Reimage from your computer.
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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 GandCrab v4.1 virus, follow these steps:

Remove GandCrab v4.1 using Safe Mode with Networking

If GandCrab 4.1 is blocking the operation of anti-malware software, enter Safe Mode with Networking and start-up the program from there:

  • 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 GandCrab v4.1

    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 GandCrab v4.1 removal.

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

Remove GandCrab v4.1 using System Restore

You can also use System Restore to disable the threat:

  • 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 GandCrab v4.1. 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 GandCrab v4.1 removal is performed successfully.

Bonus: Recover your data

Guide which is presented above is supposed to help you remove GandCrab v4.1 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 GandCrab v4.1, you can use several methods to restore them:

Try Data Recover Pro

This tool was originally created to redeem files that were accidentally deleted or otherwise corrupted. Nevertheless, experts observed positive results when it comes to Data Recover Pro dealing with ransomware 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 GandCrab v4.1 ransomware;
  • Restore them.

Use Windows Previous Versions feature

This option can only be used if System Restore was enabled before ransomware attacked the device.

  • 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 could be the answer

Ransomware usually deletes Shadow Volume Copies automatically. However, in some cases it may fail to do that. ShadowExplorer would be an excellent tool to recover all encrypted files in such case.

  • 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.

Decrypter is not available yet

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from GandCrab v4.1 and other ransomwares, use a reputable anti-spyware, such as Reimage, Malwarebytes MalwarebytesCombo Cleaner or Plumbytes Anti-MalwareMalwarebytes Malwarebytes

About the author

Jake Doevan
Jake Doevan - Computer technology expert

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