Over 625 000 Computer Systems & 5.25 Billion Files Hostages Thanks to CryptoWall
In the past six months, the users of more than 625 000 computers were attacked by the biggest and most destructive ransomware threat on Internet – CryptoWall. Spreading since November 2013, the threat remained in the shadow of another ransomware program – CryptoLocker. According to the estimations made by the malware researchers, the creators of this file-encrypting ransomware program have already earned more than US$1 million.
The Nature of CryptoWall Ransomware
CryptoWall is a trojan horse ransomware with aggressive distribution through spam emails with malicious attachments or links, download from infected sites and installations by other malware programs already running on the user’s PC. The command and control servers of CryptoWall give an identity number to every infection and generate RSA public and private key for each one. The public key is sent to the infected computers and is used by CryptoWall to encrypt files with popular extensions. These might be documents, movies, images, etc. usually stored on local hard drives, mapped network shares and cloud storage services.
The researches confirm that the files encrypted with an RSA public key can be decrypted only with the corresponding private key, which is kept by the cyber criminals and is provided only after the ransom has been paid.
The encryption of Cryptowall cannot be reversed without the key. So if the files get locked, the user has to pay up, or will lose the files.
According to the malware researchers, CryptoWall infected numerous computers in the United States, followed by computers in Vietnam, UK, Canada and India, Australia, France, Germany and Turkey. The ransom asked for is in Bitcoin crypto currency, however the earlier options included pre-paid cards like Paysafecard, MoneyPak, cashU, and Ukash.
In case the victim does not pay the ransom, the sum increases with the time. The payments range between 200 USD to 10 000 USD.
The malware specialists have found similarities between the CryptoWall samples and those of Tobfy – an older ransomware family. If the malware is from the same cyber criminals, this means that they have long experience in ransomware operations.
CryptoWall: How to Reduce the Risk of Infection
The users should follow these steps to in order to reduce the risk of infection from CryptoWall.
- Performing system updates to fix vulnerabilities
- Protect the file sharing
- Disable the autorun
- Follow best practices for instant messaging, browsing and email
How to Remove CryptoWall Safely?
How to Remove from Windows.
Step 1: Boot Your PC In Safe Mode to isolate and remove
Step 2: Uninstall and related software 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.
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:
Step 4: Scan for with SpyHunter Anti-Malware Tool
Step 5 (Optional): Try to Restore Files Encrypted by .
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.
If the above link does not work for you and your region, try the other two links below, that lead to the same product:
Get rid of from Mac OS X.
Step 1: Uninstall and remove related files and objects
1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:
- Go to Finder.
- In the search bar type the name of the app that you want to remove.
- Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
- If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.
In case you cannot remove via Step 1 above:
In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:
You can repeat the same procedure with the following other Library directories:
Tip: ~ is there on purpose, because it leads to more LaunchAgents.
Step 2: Scan for and remove files from your Mac
When you are facing problems on your Mac as a result of unwanted scripts and programs such as , the recommended way of eliminating the threat is by using an anti-malware program. Combo Cleaner offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.
Step 3 (Optional): Try to Restore Files Encrypted by on your Mac.
Ransomware for Mac aims to encode all your files using an encryption algorithm which may be very difficult to decode, unless you pay money. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files, but only in some cases. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.