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Remove Rokku Ransomware and Restore .Rokku Encrypted Files

rokku ransomware-pic-sensorstechforumA very well concealed and effective ransomware has been reported to encrypt user files with the .rokku file extension. It is known as Rokku Ransomware, and its malicious files have a very low detection rate by antivirus software. Users who have been affected and have had their files encrypted by Rokku’s strong cypher are strongly advised not to pay any ransom money to the cyber-criminals for file decryption. Instead, experts warn that the ransomware should immediately be removed and alternative file restoration methods, such as the ones illustrated in this article, to be sought after.

NameRokku
TypeRansomware
Short DescriptionEncrypts the data on the infected computer and demands a ransom payment (in BitCoin or other services) from the user for its restoration.
SymptomsThe user’s files are encrypted with an added .rokku file extension to them.
Distribution MethodVia malicious URLs or email attachments.
Detection ToolDownload Malware Removal Tool, to See If Your System Has Been Affected by Rokku
User Experience Join our forum to discuss Rokku.
Data Recovery ToolWindows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

Rokku Ransomware – Spread

To be distributed throughout the user PCs, the ransomware may use the most modern file obfuscators and a Trojan.Downloader or an Exploit Kit. It may look for the most desirable targets to spam malicious URLs containing the Trojan or the Exploit kit. This means that you may encounter it in several websites where it is likely that you may have clicked on an infected URL.

But this is not the only mean of distribution, ransomware such as Rokku uses to spread. It may also be distributed in malicious URLs or (less likely) malicious attachments featured in spam emails. The attachments may be archives since most e-mail service providers have the ability to block the attachments from potentially dangerous emails.

Once an activation has been initiated a port may be opened on the compromised computer and the actual Rokku ransomware payload may be downloaded on the victim’s PC.

Rokku Ransomware In Detail

Once this cryptomalware has been initiated on your device it may begin to deploy its malicious modules to several different Windows locations:

  • %System%
  • %AppData%
  • %User’s Profile%
  • %Roaming%

The files may be of several executable formats (.vbs, .tmp, .bat, .dll, .exe) and they may have different functions.

The ransomware then scans for the most used file extensions by the user which may be the commonly used file extensions(http://fileinfo.com/filetypes/common) and encrypts them putting the .rokku file extension on them. An encrypted file may look like the following:

→ DSC008.jpg.rokku without an icon

After encoding the user data, the crypto-malware places the following files for the user to see:

  • README_HOW_TO_UNLOCK.html
  • README_HOW_TO_UNLOCK.txt

The files are essentially ransom notes of this malware, which contain the instructions for the user to read and hopefully for the cyber crooks pay ransom money to decrypt the files via an anonymous Onion-based network. Here are the contents of the ransom notes:

→ “YOUR FILE HAS BEEN LOCKED
To unlock your files, follow the instructions bellow:
1. Download and install Tor Browser
2. After a successful installation, run Tor Browser and wait for its initialization.
3. Type in the address bar: http://z092uue92j2eks2m.onion
4. Follow the instructions on the site.”

Remove Rokku Ransomware and Restore Your Files

Regarding the removal of this ransomware, one must be very careful and perform a backup of the encrypted data on an external drive or in the cloud. Then it is advisable NOT to reinstall Windows. Instead, it is recommended to use advanced anti-malware software to detect all of its associated files plus other malware that may currently be residing on your computer.

Regarding the file restoration, it is preferable if you will attempt to decrypt directly the data to use a powerful computer. In case you are trying to bypass direct decryption and attempt methods like file restoration, it is crucial not to format the HDD from your computer. More information and methods you may find in step “4. Restore files encrypted by Rokku” below.

1. Boot Your PC In Safe Mode to isolate and remove Rokku

Boot Your PC Into Safe Mode

1. For Windows 7,XP and Vista. 2. For Windows 8, 8.1 and 10.

For Windows XP, Vista, 7 systems:

1. Remove all CDs and DVDs, and then Restart your PC from the “Start” menu.
2. Select one of the two options provided below:

For PCs with a single operating system: Press “F8” repeatedly after the first boot screen shows up during the restart of your computer. In case the Windows logo appears on the screen, you have to repeat the same task again.

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For PCs with multiple operating systems: Тhe arrow keys will help you select the operating system you prefer to start in Safe Mode. Press “F8” just as described for a single operating system.

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3. As the “Advanced Boot Options” screen appears, select the Safe Mode option you want using the arrow keys. As you make your selection, press “Enter“.

4. Log on to your computer using your administrator account

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While your computer is in Safe Mode, the words “Safe Mode” will appear in all four corners of your screen.

Step 1: Open the Start Menu

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Step 2: Whilst holding down Shift button, click on Power and then click on Restart.
Step 3: After reboot, the aftermentioned menu will appear. From there you should choose Troubleshoot.

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Step 4: You will see the Troubleshoot menu. From this menu you can choose Advanced Options.

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Step 5: After the Advanced Options menu appears, click on Startup Settings.

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Step 6: Click on Restart.
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Step 7: A menu will appear upon reboot. You should choose Safe Mode by pressing its corresponding number and the machine will restart.

2. Remove Rokku with SpyHunter Anti-Malware Tool

Remove Rokku with SpyHunter Anti-Malware Tool

1. Install SpyHunter to scan for and remove Rokku.2. Scan with SpyHunter to Detect and Remove Rokku.
Step 1:Click on the “Download” button to proceed to SpyHunter’s download page.

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It is highly recommended to run a scan before purchasing the full version of the software to make sure that the current version of the malware can be detected by SpyHunter.

Step 2: Guide yourself by the download instructions provided for each browser.
Step 3: After you have installed SpyHunter, wait for it to automatically update.

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Step1: After the update process has finished, click on the ‘Scan Computer Now’ button.
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Step2: After SpyHunter has finished scanning your PC for any Rokku files, click on the ‘Fix Threats’ button to remove them automatically and permanently.
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Step3: Once the intrusions on your PC have been removed, it is highly recommended to restart it.

3. Back up your data to secure it against infections and file encryption by Rokku in the future

Back up your data to secure it against attacks in the future

IMPORTANT! Before reading the Windows backup instructions, we highly recommend to back up your data automatically with cloud backup and insure it against any type of data loss on your device, even the most severe. We recommend reading more about and downloading SOS Online Backup .

To back up your files via Windows and prevent any future intrusions, follow these instructions:

1. For Windows 7 and earlier 1. For Windows 8, 8.1 and 10 1. Enabling the Windows Defense Feature (Previous Versions)

1-Click on Windows Start Menu
backup-1
2-Type Backup And Restore
3-Open it and click on Set Up Backup
w7-backup3
4-A window will appear asking you where to set up backup. You should have a flash drive or an external hard drive. Mark it by clicking on it with your mouse then click on Next.
backup-3
5-On the next window, the system will ask you what do you want to backup. Choose the ‘Let Me Choose’ option and then click on Next.
backup-4
6-Click on ‘Save settings and run backup’ on the next window in order to protect your files from possible attacks by Rokku.
backup-5

1-Press Windows button + R
filehistory-1
2-In the window type ‘filehistory’ and press Enter
filehistory-2
3-A File History window will appear. Click on ‘Configure file history settings’
filehistory-3
4-The configuration menu for File History will appear. Click on ‘Turn On’. After its on, click on Select Drive in order to select the backup drive. It is recommended to choose an external HDD, SSD or a USB stick whose memory capacity is corresponding to the size of the files you want to backup.
filehistory-4
5-Select the drive then click on ‘Ok’ in order to set up file backup and protect yourself from Rokku.

1- Press Windows button + R keys.
sysdm
2- A run windows should appear. In it type ‘sysdm.cpl’ and then click on Run.
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3- A System Properties windows should appear. In it choose System Protection.
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5- Click on Turn on system protection and select the size on the hard disk you want to utilize for system protection.
6- Click on Ok and you should see an indication in Protection settings that the protection from Rokku is on.
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Restoring a file via Windows Defense feature:
1-Right-click on the encrypted file, then choose Properties.
file-restore1
2-Click on the Previous Versions tab and then mark the last version of the file.
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3-Click on Apply and Ok and the file encrypted by Rokku should be restored.

4. Restore files encrypted by Rokku

Restore Files Encrypted by Rokku

Security engineers strongly advise users NOT to pay the ransom money and attempt restoring the files using other methods. Here are several suggestions:

To restore your data, your first bet is to check again for shadow copies in Windows using this software:

Shadow Explorer

If this method does not work, Kaspersky have provided a decryptors for files encrypted with the this and other encryption algorithms:

Kaspersky Decryptors

Another method of restoring your files is by trying to bring back your files via data recovery software. Here are some examples of data recovery programs:

There is also the technical option to use a network sniffer:

Another way to decrypt the files is by using a Network Sniffer to get the encryption key, while files are encrypted on your system. A Network Sniffer is a program and/or device monitoring data traveling over a network, such as its internet traffic and internet packets. If you have a sniffer set before the attack happened you might get information about the decryption key.

Optional: Using Alternative Anti-Malware Tools

Remove Rokku Using Other Alternative Tools

STOPZilla Anti Malware
1. Download and Install STOPZilla Anti-malware to Scan for And Remove Rokku.
Step 1: Download STOPZilla by clicking here.
Step 2: A pop-up window will appear. Click on the ‘Save File’ button. If it does not, click on the Download button and save it afterwards.
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Step 3: After you have downloaded the setup, simply open it.
Step 4: The installer should appear. Click on the ‘Next’ button.
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Step 5: Check the ‘I accept the agreement’ check circle if not checked if you accept it and click the ‘Next’ button once again.
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Step 6: Review and click on the ‘Install’ button.
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Step 7: After the installation process has completed click on the ‘Finish’ button.

2. Scan your PC with STOPZilla Anti Malware to remove all Rokku associated files completely.
Step 1: Launch STOPZilla if you haven’t launched it after install.
Step 2: Wait for the software to automatically scan and then click on the ‘Repair Now’ button. If it does not scan automatically, click on the ‘Scan Now’ button.
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Step 3: After the removal of all threats and associated objects, you should Restart your PC.

NOTE! Substantial notification about the Rokku threat: Manual removal of Rokku requires interference with system files and registries. Thus, it can cause damage to your PC. Even if your computer skills are not at a professional level, don’t worry. You can do the removal yourself just in 5 minutes, using a malware removal tool.
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Ventsislav Krastev

Ventsislav has been covering the latest malware, software and newest tech developments at SensorsTechForum for 3 years now. He started out as a network administrator. Having graduated Marketing as well, Ventsislav also has passion for discovery of new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management and then Network Administration, he found his passion within cybersecrurity and is a strong believer in basic education of every user towards online safety.

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