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Gandcrab 5.1 ransomware. How to remove? (Uninstall guide)

removal by Linas Kiguolis - - | Type: Ransomware

GandCrab 5.1 – another variant of the infamous GandCrab virus which is demanding $1200 in exchange for files

Gandcrab 5.1 ransomware
Gandcrab 5.1 ransomware is another version of the popular Gandcrab ransomware family which encrypts files on the infected PC

Questions about Gandcrab 5.1 ransomware

Gandcrab 5.1 is considered to be yet another version of the notorious virus family named Gandcrab. This ransomware group has been very persistent as it contains lots of new variants which are set to make users' files useless. GandCrab v5.1 has been spread with the help of malicious .JS files and then set to lock the target files by using a specific Salsa20 encryption algorithm to demand a particular ransom. After the encryption, the 5.1 virus version modifies the desktop wallpaper and places a file named “[victim's_ID]-DECRYPT.txt” in which the victim can find the ransom-demanding message. The affected files are marked with the .[random characters] file extension and cannot be used properly. The decryption[1] tool, which is held by GandCrab 5.1 developers is sold for $1200. If the victim is too late to pay, a note announces that the price was doubled. Recently, it was discovered that the virus is using an updated Fallout EK that came back with new features.

Name GandCrab V5.1
Type Ransomware
Relation Gandcrab family
Extension .[random characters], written in either lowercase or uppercase
Ransom message “[victim's_ID]-DECRYPT.txt”
Price $1200. After some time, the price is doubled
Related files
  • DOC402942349491-PDF.7Z
  • DOC402942349491-PDF.docx
  • DOC402942349491-PDF.js
  • DOC402942349491-PDF.PDF
  • Love_You_2019_300232289-txt.ZIP
  • Love_You_2019_300232289-txt.JS
Encryption key Salsa20
Danger level Very high. Locks up important files, might erase their Shadow Copies
Distribution Email spam, unsafe sites, software packages
Recent features Distribution via Fallout exploit kit, as a secondary payload after the info-stealing Vidar infiltration
Elimination process Detect malware with Reimage

Once Gandcrab v5.1 infects the targeted computer system, it produces a ransom message which is named “[random characters]-DECRYPT.txt”. The note claims:

—= GANDCRAB V5.1 =—

***********************UNDER NO CIRCUMSTANCES DO NOT DELETE THIS FILE, UNTIL ALL YOUR DATA IS RECOVERED***********************

*****FAILING TO DO SO, WILL RESULT IN YOUR SYSTEM CORRUPTION, IF THERE ARE DECRYPTION ERRORS*****

Attention!

All your files, documents, photos, databases and other important files are encrypted and have the extension: .XXXXX

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 in TOR browser: [link]
| 4. Follow the instructions on this page

—————————————————————————————-

On our page you will see instructions on payment 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—

Gandcrab 5.1 ransomware is using a unique algorithm to lock the targeted files which is called Salsa20.[2] Even though the crooks might threaten the user that the only way to recover lost data is by paying them, be clever and do not rush to pay the demanded ransom price! According to tech experts from Virusai.lt,[3] such crooks are very likely to scam the victims.

We suggest performing the Gandcrab 5.1 removal with reputable tools only. Furthermore, note that you need to detect all virus-related content in the system, otherwise, if you leave some hazardous components on the computer, you might not be able to perform any data recovery methods successfully. For malware detection, use Reimage or another similar program.

Once you remove Gandcrab 5.1 from the system, you can proceed with some file restoring methods that we have provided at the end of this article. Furthermore, make sure that you boot your computer to Safe Mode with Networking or activate the System Restore feature to disable the ransomware[4] and all its activities permanently.

Unfortunately, Gandcrab 5.1 decryptor is still in the development, so there is no official tool you can download to disable the code that made your files useless. If you lost your files, be sure to find your backups after eliminating this malware from the system. This is the most effective way to recover encrypted data. If you can't find them or if you simply don't have them, try using third party tools that are given at the end of this removal guide.

It is also known that Gandcrab 5.1 ransomware is capable of erasing Shadow Volume Copies of the target files which means that files can hardly be restored by using Shadow Explorer. If so, the ransomware virus manipulates a Windows component named wmic.exe which performs the elimination of the Shadow Copies.[5]

GandCrab v5.1 keeps changing its distribution tactics and performance

According to the latest findings, GandCrab v5.1 has started relying on exploit kits, e.g. Fallout EK, to infect systems with its code undetected. Additionally, virus authors have changed tactics on the initial encryption process, file extensions and the ransom page.

When, in most cases, ransomware appends one specifically generated extension to the encrypted data, GandCrab now uses randomly created IDs to mark files. Each of them also gets its own TOR browser page with ransom payment instructions. The unique ID appeared when the updated Fallout exploit kit came to light in early January 2019. Since January 15th, this Fallout EK activity was linked to the delivery of GandCrab ransomware.

Alongside this exploit kit, the particular GandCrab v5.1 ransomware was recently discovered as the secondary payload in the distribution of Vidar infostealer.[6] The campaign is also using exploit kit to infiltrate targeted devices and, once infected, drop Vidar malware together with the ransomware on the computer. 

Next to EKs, the virus is actively spread via email spam or online

It is known that Gandcrab 5.1 has been trying to access the computer system via rogue email messages that appear to include the infected file attachment. According to one victim who was infected with the ransomware, the questionable email message looked like this:

From: Deanna Bennett <>
Subject: Payment Invoice #93611
Attachment: DOC402942349491-PDF.7Z

Dear Customer,
To read your document please open the attachment and reply as soon as possible.
Kind regards,
TCR Customer Support

As you can see, crooks who are hiding behind Gandcrab 5.1 ransomware pretend to be from specific organizations and try to convince the users to open the attached document (.docx, .JS, or .PDF file) which appears to be malicious. The subject of such false email messages include the following phrases:

  • Ticket #07009
  • Order #87884
  • Document #72170
  • Invoice #21613
  • Payment #72985
  • Your Document #78391
  • Your Order #16323
  • Your Ticket #23428

The attachments used to spread Gandcrab v5.1 include the following names. However, they can be changed while trying to infect unaware users:

  • DOC402942349491-PDF.7Z
  • DOC402942349491-PDF.docx
  • DOC402942349491-PDF.js
  • DOC402942349491-PDF.PDF
  • Love_You_2019_300232289-txt.ZIP
  • Love_You_2019_300232289-txt.JS

Nevertheless, Gandcrab 5.1 virus is also capable of spreading via rogue online websites, software cracks, adware, and similar downloads, so make sure you are very careful while browsing the Internet and avoid downloading software packages such as Merging Image to PDF, Securitask, SysTools PST Merge.

Be aware of questionable-looking links and other components that you overcome while browsing. If you ever enter a rogue website, make sure that you close it immediately and never return to it again. Additionally, make sure that you carefully track all your incoming downloads which you can do in the Custom or Advanced settings' section. Furthermore, ensure that no installation step was skipped as you might miss some hazardous content and let it successfully infiltrate your computer system.

GandCrab v5.1
GandCrab v5.1 ransomware is distributed via Fallout EK and as a secondary payload in different malware campaigns.

Delete Gandcrab v5.1 from your computer system and unlock files

If Gandcrab 5.1 has occupied your computer and locked all of your valuable files, you should eliminate the ransomware virus before you perform the recovery process. First, detect all malware-laden objects in the infected system. We suggest downloading and installing one of these tools: Reimage, Malwarebytes MalwarebytesCombo Cleaner, or Plumbytes Anti-MalwareMalwarebytes Malwarebytes. These programs are capable of scanning the entire computer, finding damaged entries, and detecting unsafe components.

Note that Gandcrab v5.1 removal cannot be performed manually as hazardous components might be missed by the human eye. Additionally, make sure that you reboot the system to Safe Mode with Networking to disable the malicious activity. After this, take a look at our below-provided file recovery steps. Complete the methods exactly as shown in the instructions.

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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 Gandcrab 5.1 virus, follow these steps:

Remove Gandcrab 5.1 using Safe Mode with Networking

Turn on Safe Mode with Networking and disable Gandcrab V5.1. Then, get rid of the virus and repeat the scan when in normal mode:

  • 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 5.1

    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 5.1 removal.

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

Remove Gandcrab 5.1 using System Restore

Alternatively, use System Restore feature to disable the ransomware activity:

  • 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 5.1. 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 5.1 removal is performed successfully.

Bonus: Recover your data

Guide which is presented above is supposed to help you remove Gandcrab 5.1 from your computer. To recover your encrypted files, we recommend using a detailed guide prepared by 2-spyware.com security experts.

Finding encrypted files means that a ransomware virus has performed rogue and damaging activities on your computer. You can recover some data by performing our below-mentioned recovery steps.

If your files are encrypted by Gandcrab 5.1, you can use several methods to restore them:

Use Data Recovery Pro tool to recover encrypted data

This tool might help you recover lost or encrypted files. If you perform each step exactly as shown in the instructing methods, you should succeed.

  • 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 5.1 ransomware;
  • Restore them.

Try Windows Previous Versions feature to decrypt separate files

If you have enabled the System Restore feature before the ransomware attack, this method might work correctly for you.

  • 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”.

Shadow Explorer cannot be used for data recovery

Some versions of the virus are known to eliminate Shadow Volume Copies of the target files, so there is a high chance that this method won't work. Try other options instead.

  • 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.

Sadly, no official Gandcrab v5.1 decryptor has been released yet.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Gandcrab 5.1 and other ransomwares, use a reputable anti-spyware, such as Reimage, Malwarebytes MalwarebytesCombo Cleaner or Plumbytes Anti-MalwareMalwarebytes Malwarebytes

About the author

Linas Kiguolis
Linas Kiguolis - Expert in social media

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References

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