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GandCrab v5.0.3 virus removal and files decryption

6 min read
This article contains a comprehensive description of the GandCrab 5.0.3 ransomware version and provides advice on removal of the infection and file recovery.

The ransomware family referred to as GandCrab continues to dominate the blackmail malware landscape. Its authors have recently confirmed this status quo by launching a new variant of their nasty code, which is being bolstered by a hefty wave of distribution via malicious spam and alternative vectors, including exploit kits, booby-trapped software bundles and RDP hacks. The version name is GandCrab 5.0.3. Functionally, it bears a strong resemblance to the previous edition, except for a few trivial features. The latest build still uses random extensions to fulfill its file renaming tactics. However, the length of these suffixes varies. Whereas the predecessor would append 5 characters to the original filenames, the length of the extensions in the GandCrab v5.0.3 attack scenario can be anywhere from 5 to 9 characters.

GandCrab 5.0.3 replaces desktop wallpaper with a warning message
GandCrab 5.0.3 replaces desktop wallpaper with a warning message

Therefore, a sample filename Whatever.png will be replaced with something like Whatever.png.fclsdcth. Again, the tail is random and it’s going to be unique in every individual case. The fact persists, though, that the new version can use a different number of characters in these extensions rather than a static quantity, so that’s one of the conspicuous changes accompanying the remake. The other noteworthy component of the incursion is the ransom notes. These are files named according to the following pattern: [capitalized file extension]-DECRYPT.txt. Based on the file renaming illustration mentioned above, this document’s name would be FCLSDCTH-DECRYPT.txt. A copy of it gets dropped into every encrypted folder.

Besides, the ransom note is referenced in the desktop wallpaper that the ransomware modifies, too. In particular, the rogue image displayed instead of the user-defined background says:

Encrypted by GandCrab 5.0.3
Dear [username] Your files are under strong protection by our software. In order to restore it you must buy decryptor
For further steps read [RANDOM EXTENSION]-DECRYPT.txt that is located in every encrypted folder

Therefore, the victim is coerced into finding and opening the ransom note in order to learn what their further actions to recover the locked data should be. Compared to other ransomware lineages out there, the how-to document is completely vanilla. It includes the run-of-the-mill alert about the fact of encryption and emphasizes that the only way of reinstating the files is to purchase the unique private key that only the crooks have. The manual provides a link that the user is supposed to open in Tor browser only.

This is what files encrypted by GandCrab v5.0.3 look like
This is what files encrypted by GandCrab v5.0.3 look like

The above-mentioned link leads to the GandCrab payment page. This is the element of the extortion chain that has probably undergone the biggest overhaul in terms of the design, although the gist is the same. Most importantly, it indicates the price of the GandCrab decryptor. It is typically set to 800 USD payable in either Bitcoin or Dash cryptocurrency. This amount is time-sensitive as there is a deadline for submitting the ransom – if the victim lingers beyond the provided period, they will have to cough up twice as much money. The payment page also allows decrypting one file for free as proof that the recovery is viable.

Ultimately, the users hit by GandCrab v5.0.3 are stuck in the middle of personal data loss. The ransomware pressures them into completing the buyout as soon as possible otherwise the sum will double, while the natural pursuit of fair play keeps them anxious to get their valuable files back without funding the unashamed cybercriminals. In fact, there may be a chance to restore some of the hostage entities while not sending the malefactors a single coin. Keep reading to learn how.

GandCrab v5.0.3 ransomware automated removal and data recovery

When faced with ransomware like GandCrab v5.0.3, one of the best shortcuts in terms of removal is to use Combo Cleaner, a lightweight and incredibly effective application with PC security and optimization features under the hood. It detects and thoroughly deletes threats while giving you insights into the overall health of your computer.

This program’s protection power spans modules that forestall all known types of malware, including ransomware and browser hijackers, and take your online security to the next level by blocking phishing sites and other suspicious web pages. Follow these simple steps to eliminate the infection for good:

1. Download Combo Cleaner installer.

Download GandCrab v5.0.3 remover

Combo Cleaner scans your PC with no strings attached, but you’ll have to buy its fully functional version to remove the threats it detects. The disk optimization tools that find large files and duplicates are free to use.

Download and run Combo Cleaner installer on your PC

2. Open the CCSetup.exe file to get started. Several subsequent screens will allow you to make initial customizations so that the program works exactly as you need from the get-go.Setup customizations

3. The installation will be followed by an update of malware signatures. Once this process is through, click the Start Scan button in the left-hand sidebar.Start initial scan

4. Combo Cleaner will then check system locations that are most often polluted by Windows malware. The first scan can take a while to finish.Combo Cleaner scan in progress

5. Combo Cleaner will display a system tray notification as soon as the scan is over. Click the Resolve found threats button to view the results.Scan completed

6. The scan summary shows the names and types of the detected threats as well as their statuses and locations. Click the Remove all threats button and follow further on-screen prompts to get rid of these items.Scan results

Data recovery toolkit to the rescue

Some strains of ransomware are known to delete the original files after the encryption routine has been completed. As hostile as this activity appears, it can play into your hands. There are applications designed to revive the information that was obliterated because of malfunctioning hardware or due to accidental removal. The tool called Stellar Data Recovery features this type of a capability and therefore it can be applied in ransom attack scenarios to at least get the most important files back. So use the app to get an idea of what data can be restored and let it do the recovery job. Here is a step-by-step walkthrough:

1. Download and install Stellar Data Recovery.

Download Stellar Data Recovery

2. Open the application, select the types of recoverable files to look for, and click Next.Stellar Data Recovery main screen

3. Choose the areas you want the tool to recover from and click the Scan button.Select which PC areas to recover from

4. Having scanned the specified locations, the program will display a notification about the total amount of recoverable data. Close the dialog and click the Recover button. This will hopefully help you get some of your valuable files back.Recover files

GandCrab v5.0.3 ransomware manual removal and file recovery

Some ransomware strains terminate themselves after completing the encryption job on a computer, but some don’t. Furthermore, the GandCrab v5.0.3 virus may prevent victims from using popular antimalware tools in order to stay on board for as long as possible. Under the circumstances, it may be necessary to utilize the Safe Mode with Networking or System Restore functionality.

Remove GandCrab v5.0.3 ransomware using Safe Mode with Networking

Remove GandCrab v5.0.3 ransomware using Safe Mode with Networking

Get rid of GandCrab v5.0.3 ransomware using System Restore

Get rid of GandCrab v5.0.3 ransomware using System Restore

System Restore enables Windows users to roll back all changes made to the OS since the latest restore point creation time. This feature can help eliminate the most persistent ransomware. Before going this route, though, make sure System Restore had been enabled prior to the breach, otherwise the method will be inefficient.

  • Open Windows Advanced Options Menu as described in the previous section: hit F8 repeatedly when the PC is starting up. Use arrow keys to highlight the Safe Mode with Command Prompt entry. Hit Enter.Safe Mode with Command Prompt
  • In the Command Prompt window, type cd restore and hit Entercd restore command
  • Type rstrui.exe in the new command line and press EnterType rstrui.exe command
  • When the System Restore screen pops up, click Next, select a restore point that predates the contamination, and use the application’s controls to roll back the system to this earlier state.System Restore window
Be advised that even after the ransomware is removed, files will still be encrypted and inaccessible. The malicious code cleanup part, however, is important because it keeps a relapse of the infection from occurring further on and eliminates all opportunistic malware.

Ways of non-ransom recovery of files encrypted by GandCrab v5.0.3

Cracking the crypto used by this ransom Trojan is more of a science fiction thing rather than an attainable prospect for the masses. This is why the troubleshooting in predicaments of this sort is a matter of two approaches: one is to pay the ransom, which isn’t an option for many victims; and the other is to apply instruments that take advantage of the ransomware’s possible weaknesses. If the latter is your pick, the advice below is a must-try.

Backups can make your day

Backups can make your day

Not only are you a lucky person in case you’ve been backing up your most important files, but you’re also a wise and prudent user. This isn’t necessarily a resource-heavy activity these days – in fact, some providers of online services are allocating a sufficient size of cloud storage space for free so that every customer can easily upload their critical data without paying a penny. Having removed the GandCrab v5.0.3 ransomware, therefore, all you have to do is download your stuff from the remote server or transfer it all from an external piece of hardware if that’s the case.

Restore previous versions of encrypted files

Restore previous versions of encrypted files

A positive upshot of using this technique depends on whether or not the ransomware has erased the Volume Shadow Copies of the files on your PC. This is a Windows feature that automatically makes and keeps the backups of data elements on the hard drive as long as System Restore is enabled. The cryptoware in question is programmed to switch off the Volume Shadow Copy Service (VSS), but it has reportedly failed to in some cases.

Checking one’s options regarding this workaround is doable in two ways: through the Properties menu of each file or by means of the remarkable open-source tool called Shadow Explorer. We recommend the software-based way because it’s automated, hence faster and easier. Just install the app and use its intuitive controls to get previous versions of the encrypted objects reinstated.

Shadow Explorer

Alternatively, you can leverage the Previous Versions feature, which is native to Windows operating system. This method is more cumbersome that the use of ShadowExplorer, but it can help restore the most important individual files on condition that the ransomware failed to disable the Volume Snapshot Service on the computer. Right-click on a file of choice and select Properties. Then, go to the Previous Versions tab as illustrated below.

Previous Versions

Go ahead and pick the file’s latest backup version on the list. Use the Copy or Restore buttons to reinstate this object to a new path or to its original folder, respectively.

Ransomware Prevention Tips

To avoid GandCrab v5.0.3 ransomware and other file-encrypting infections in the future, follow several simple recommendations:

  • Toggle your email provider’s anti-spam settings to filter out all the potentially harmful incoming messages. Raising the bar beyond the default protection is an important countermeasure for ransom Trojans
  • Define specific file extension restrictions in your email system. Make sure that attachments with the following extensions are blacklisted: .js, .vbs, .docm, .hta, .exe, .cmd, .scr, and .bat. Also, treat ZIP archives in received messages with extreme caution
  • Rename the vssadmin.exe process so that ransomware is unable to obliterate all Shadow Volume Copies of your files in one shot
  • Keep your Firewall active at all times. It can prevent crypto ransomware from communicating with its C&C server. This way, the threat won’t be able to obtain cryptographic keys and lock your files
  • Back up your files regularly, at least the most important ones. This recommendation is self-explanatory. A ransomware attack isn’t an issue as long as you keep unaffected copies of your data in a safe place
  • Use an effective antimalware suite. There are security tools that identify ransomware-specific behavior and block the infection before it can do any harm.

These techniques are certainly not a cure-all, but they will add an extra layer of ransomware protection to your security setup.

Revise your security status

Post-factum assessment of the accuracy component in malware removal scenarios is a great habit that prevents the comeback of harmful code or replication of its unattended fractions. Make sure you are good to go by running an additional safety checkup. Another benefit of using the antimalware tool is that it will keep ransomware threats from intruding on your computer further on.

Download GandCrab v5.0.3 removal tool

One Comment

  1. aisam

    November 30, 2018 at 9:15 am

    cara mengembalikan file yang terkena virus .cvjnfle ransomware


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