A new version of CryptoWall arrived in the beginning of November. Some researchers immediately dubbed it CryptoWall 4.0, while others were more precautious and referred to it as to a ‘point release’. A couple of weeks later, all doubts evaporated. Security researchers have just confirmed that it is indeed CryptoWall 4.0. They have also unveiled that 4.0 is currently being distributed via the infamous Nuclear Exploit Kit.
Moreover, many AV engineers believe that CryptoWall 5.0 and 6.0 are currently being written. Ransomware is now seen not only as a highly damaging form of cybercrime but also as a form of a very successful software company. Or perhaps a malware enterprise?
New Information about CryptoWall 4.0
Earlier this week the SANS Internet Storm Center informed that an individual or a group of individuals is using domains that belong to the Chinese registrar BizCN to spread CryptoWall’s latest via the Nuclear EK. According to the security engineer Brad Duncan the ransomware’s 4th edition was initially spread via malicious spam and phishing emails. It is now the first time that CryptoWall 4.0’s distribution relies on an exploit kit.
In a conversation with Threatpost, Brad Duncan says that:
“I’ve always expected 4.0 to spread and replace CryptoWall 3.0 in all areas. I noticed the same thing when CryptoWall 2.0 replaced the original CryptoWall in 2014. It didn’t happen immediately. It started with malicious spam and moved to exploit kits. As criminals start delivering CryptoWall 4.0 through exploit kits, it won’t immediately happen with all exploit kits at the same time. You’ll start seeing it from one actor, then another, and another. At some point everyone will have moved to the new version.”
The researcher has also discovered that the attack, launched from the BizCN domains, has recently switched the IP addresses for the gate domains. These domains serve as intermediary servers between the compromised websites and the server hosting the EK. The malicious actor behind the curtains of the operations is currently using the Nuclear Exploit Kit.
This is what Mr. Duncan says about the operation:
“Gate servers can check for operating system or browser type from the user agent string in the HTTP headers sent by a potential victim. Depending on the user agent string, the Gate server will respond accordingly. With the BizCN gates, when the OS is not Windows, the gate server will respond with a ‘404 not found’ (no need to waste resources on a host that’s not vulnerable). If the user agent string shows a Windows host, the gate server will return a 200 OK, which will then generate traffic to an EK server.”
The updated version of CryptoWall has been observed to encrypt the names of the victim’s files – a procedure that will certainly confuse victims even more. Another peculiar thing about CryptoWall 4.0 is that its authors have now adopted a sense of humor. Yes, you read correctly. The updated CryptoWall 4.0’s message goes like that, making fun of users in quite the obvious manner:
‘Congratulations! You have now become a part of large community CryptoWall!’
Overall, the network traffic observed by Duncan looks almost identical to CryptoWall 3.0, with the only difference that an IP address check is not applied. He also adds that the snort-based signatures he has seen for CryptoWall 3.0 callback traffic are still valid for 4.0.
How Can I Remove CryptoWall 4.0 and Stay Protected?
Removing CryptoWall 4.0 is the easy part, as its encryption may be impossible to beat. However, we have still compiled a removal method followed by a decryption process.
1. Boot Your PC In Safe Mode to isolate and remove
1. 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.
– For PCs with multiple operating systems: Òhe 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.
3. As the “Advanced Boot Options” screen appears, select the Safe Mode with Networking option you want using the arrow keys. As you make your selection, press “Enter“.
4. Log on to your computer using your administrator account
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
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.
Step 4: You will see the Troubleshoot menu. From this menu you can choose Advanced Options.
Step 5: After the Advanced Options menu appears, click on Startup Settings.
Step 6: Click on Restart.
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 with SpyHunter Anti-Malware Tool
2. Remove with SpyHunter Anti-Malware Tool
1. Install SpyHunter to scan for and remove .2. Scan with SpyHunter to Detect and Remove .
Step 1:Click on the “Download” button to proceed to SpyHunter’s download page.
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.
Step1: After the update process has finished, click on the ‘Scan Computer Now’ button. Step2: After SpyHunter has finished scanning your PC for any files, click on the ‘Fix Threats’ button to remove them automatically and permanently. 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 encryptions by in the future
3. Back up your data to secure it against attacks in the future
Security engineers recommend that you back up your files immediately, preferably on an external memory carrier in order to be able to restore them. In order to protect yourself from (For Windows Users) please follow these simple steps:
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
2-Type Backup And Restore
3-Open it and click on Set Up Backup
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.
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.
6-Click on ‘Save settings and run backup’ on the next window in order to protect your files from possible attacks by .
1-Press Windows button + R
2-In the window type ‘filehistory’ and press Enter
3-A File History window will appear. Click on ‘Configure file history settings’
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.
5-Select the drive then click on ‘Ok’ in order to set up file backup and protect yourself from .
1- Press Windows button + R keys.
2- A run windows should appear. In it type ‘sysdm.cpl’ and then click on Run.
3- A System Properties windows should appear. In it choose System Protection.
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 is on. Restoring a file via Windows Defense feature:
1-Right-click on the encrypted file, then choose Properties.
2-Click on the Previous Versions tab and then mark the last version of the file.
3-Click on Apply and Ok and the file encrypted by should be restored.
Can I Restore Files Encrypted by CryptoWall 4.0?
Cryptowall’s encryption is considered to be near-impossible to decrypt. However, the good news is that it may have several different variants which may use different decryption methods that are easier to decrypt. You can give it a try following this article: Restore Files Encrypted by RSA Encryption
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It is 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. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria.
2. After you have installed SpyHunter, wait for it to update automatically.
3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.
4. After SpyHunter has finished scanning your PC for any files of the associated threat and found them, you can try to get them removed automatically and permanently by clicking on the 'Next' button.
If any threats have been removed, it is highly recommended to restart your PC.
Ransomware Automatic Removal - Video Guide
Step 2: Uninstall and related malware from Windows
Here is a method in few easy steps that should be able to uninstall most programs.No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it. To do that:
1. Hold the Windows Logo Button and "R" on your keyboard. A Pop-up window will appear.
2. In the field type in "appwiz.cpl" and press ENTER.
3. This will open a window with all the programs installed on the PC. Select the program that you want to remove, and press "Uninstall"
Follow the instructions above and you will successfully delete most unwanted and malicious programs.
Step 3: Clean any registries, created by on your computer.
The usually targeted registries of Windows machines are the following:
You can access them by opening the Windows registry editor and deleting any values, created by there. This can happen by following the steps underneath:
1. Open the Run Window again, type "regedit" and click OK.
2. When you open it, you can freely navigate to the Run and RunOnce keys, whose locations are shown above.
3. You can remove the value of the virus by right-clicking on it and removing it.
Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.
IMPORTANT! Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode. This will enable you to install and use SpyHunter 5 successfully.
Step 4: Boot Your PC In Safe Mode to isolate and remove
OFFER
Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your PC with SpyHunter
Keep in mind, that SpyHunter’s scanner is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware removal tool to remove the malware threats. Read our SpyHunter 5 review. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria
1. Hold Windows Key + R.
2. The "Run" Window will appear. In it, type "msconfig" and click OK.
3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".
Tip: Make sure to reverse those changes by unticking Safe Boot after that, because your system will always boot in Safe Boot from now on.
4. When prompted, click on "Restart" to go into Safe Mode.
5. You can recognise Safe Mode by the words written on the corners of your screen.
Step 5: Try to Restore Files Encrypted by .
Method 1: Use STOP Decrypter by Emsisoft.
Not all variants of this ransomware can be decrypted for free, but we have added the decryptor used by researchers that is often updated with the variants which become eventually decrypted. You can try and decrypt your files using the instructions below, but if they do not work, then unfortunately your variant of the ransomware virus is not decryptable.
1Right-click on the decrypter and click on Run as Administrator as shown below:
2. Agree with the license terms:
3. Click on "Add Folder" and then add the folders where you want files decrypted as shown underneath:
4. Click on "Decrypt" and wait for your files to be decoded.
Note: Credit for the decryptor goes to Emsisoft researchers who have made the breakthrough with this virus.
Method 2: Use data recovery software
Ransomware infections and aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.
1. Download the recommended Data Recovery software by clicking on the link underneath:
Simply click on the link and on the website menus on the top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.
-FAQ
What is Ransomware?
is a ransomware infection - the malicious software that enters your computer silently and blocks either access to the computer itself or encrypt your files.
Many ransomware viruses use sophisticated encryption algorithms to make your files inaccessible. The goal of ransomware infections is to demand that you pay a ransom payment to get access to your files back.
What Does Ransomware Do?
Ransomware in general is a malicious software that is designed to block access to your computer or files until a ransom is paid.
Ransomware viruses can also damage your system, corrupt data and delete files, resulting in the permanent loss of important files.
How Does Infect?
Via several ways. Ransomware infects computers by being sent via phishing emails, containing virus attachment. This attachment is usually masked as an important document, like an invoice, bank document or even a plane ticket and it looks very convincing to users.
Another way you may become a victim of is if you download a fake installer, crack or patch from a low reputation website or if you click on a virus link. Many users report getting a ransomware infection by downloading torrents.
How to Open . files?
You can't without a decryptor. At this point, the . files are encrypted. You can only open them once they are decrypted using a specific decryption key for the particular algorithm.
What to Do If a Decryptor Does Not Work?
Do not panic, and backup the files. If a decryptor did not decrypt your . files successfully, then do not despair, because this virus is still new.
Can I Restore "." Files?
Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore . files.
These methods are in no way 100% guaranteed that you will be able to get your files back. But if you have a backup, your chances of success are much greater.
How To Get Rid of Virus?
The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti-malware program.
It will scan for and locate ransomware and then remove it without causing any additional harm to your important . files.
Can I Report Ransomware to Authorities?
In case your computer got infected with a ransomware infection, you can report it to the local Police departments. It can help authorities worldwide track and determine the perpetrators behind the virus that has infected your computer.
Below, we have prepared a list with government websites, where you can file a report in case you are a victim of a cybercrime:
Cyber-security authorities, responsible for handling ransomware attack reports in different regions all over the world:
Reports may be responded to in different timeframes, depending on your local authorities.
Can You Stop Ransomware from Encrypting Your Files?
Yes, you can prevent ransomware. The best way to do this is to ensure your computer system is updated with the latest security patches, use a reputable anti-malware program and firewall, backup your important files frequently, and avoid clicking on malicious links or downloading unknown files.
Can Ransomware Steal Your Data?
Yes, in most cases ransomware will steal your information. It is a form of malware that steals data from a user's computer, encrypts it, and then demands a ransom in order to decrypt it.
In many cases, the malware authors or attackers will threaten to delete the data or publish it online unless the ransom is paid.
Can Ransomware Infect WiFi?
Yes, ransomware can infect WiFi networks, as malicious actors can use it to gain control of the network, steal confidential data, and lock out users. If a ransomware attack is successful, it could lead to a loss of service and/or data, and in some cases, financial losses.
Should I Pay Ransomware?
No, you should not pay ransomware extortionists. Paying them only encourages criminals and does not guarantee that the files or data will be restored. The better approach is to have a secure backup of important data and be vigilant about security in the first place.
What Happens If I Don't Pay Ransom?
If you don't pay the ransom, the hackers may still have access to your computer, data, or files and may continue to threaten to expose or delete them, or even use them to commit cybercrimes. In some cases, they may even continue to demand additional ransom payments.
Can a Ransomware Attack Be Detected?
Yes, ransomware can be detected. Anti-malware software and other advanced security tools can detect ransomware and alert the user when it is present on a machine.
It is important to stay up-to-date on the latest security measures and to keep security software updated to ensure ransomware can be detected and prevented.
Do Ransomware Criminals Get Caught?
Yes, ransomware criminals do get caught. Law enforcement agencies, such as the FBI, Interpol and others have been successful in tracking down and prosecuting ransomware criminals in the US and other countries. As ransomware threats continue to increase, so does the enforcement activity.
About the Research
The content we publish on SensorsTechForum.com, this how-to removal guide included, is the outcome of extensive research, hard work and our team’s devotion to help you remove the specific malware and restore your encrypted files.
How did we conduct the research on this ransomware?
Our research is based on an independent investigation. We are in contact with independent security researchers, and as such, we receive daily updates on the latest malware and ransomware definitions.
To better understand the ransomware threat, please refer to the following articles which provide knowledgeable details.
As a site that has been dedicated to providing free removal instructions for ransomware and malware since 2014, SensorsTechForum’s recommendation is to only pay attention to trustworthy sources.
A new version of CryptoWall arrived in the beginning of November. Some researchers immediately dubbed it CryptoWall 4.0, while others were more precautious and referred to it as to a ‘point release’. A couple of weeks later, all doubts evaporated. Security researchers have just confirmed that it is indeed CryptoWall 4.0. They have also unveiled that 4.0 is currently being distributed via the infamous Nuclear Exploit Kit. 
1. For Windows 7,XP and Vista.
2. For Windows 8, 8.1 and 10.
1. Install SpyHunter to scan for and remove .
1. For Windows 7 and earlier
Follow the instructions above and you will successfully delete most unwanted and malicious programs.
Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.
