CryptoDefense (also known as HOW_DECRYPT.txt) is a very dangerous cyber infection, which belongs to ransomware category. The most important thing about this virus is that it can encrypt all your text files, videos, office documents and similar data. According to experts, CryptoDefense is still incapable to affect Macs but it can easily attack all Windows versions, such as Windows XP, Windows Vista,Windows 8, etc. Similarly to previous ransomwares, this variant displays a huge alert after taking over its target PC system. This warning claims that all files were encrypted by CryptoDefense Software and says that the victim needs to obtain the private key in order decrypt them. Of course, this service is not for free – scammers ask paying $500 in bitcoins. If you fail to pay, they promise that after 4 days the ransom will be doubled.
Unfortunately, there is still no method to decrypt files that were encrypted by CryptoDefense virus. Even restoring files via backup fails. That's why it's very important you to understand how to avoid this ransomware. The most important thing in this situation is to ignore all unfamiliar emails that typically report about nonexisting purchases, payments and similar things could make people click on the malicious link. Similarly to CTB Locker, CryptorBit and CryptoLocker viruses, it may also enter you PC in a bundle with fake Flash and Java updates, so ignore all unexpected alerts offering downloading them for free. As soon as CryptoDefense virus enters the system, it encrypts data files and starts showing this notification:
All files including videos, photos and documents on your computer are encrypted by CryptoDefense Software.
Encryption was produced using a unique public key RSA-2048 generated for this computer. To decrypt files you need to obtain the private key.
The single copy of the private key, which will allow you to decrypt the files, located on a secret server on the Internet;
the server will destroy the key after a month. After that, nobody and never will be able to restore files.
CryptoDefense instructs people how they can pay the ransom and purchase a tool for decryption. For that, they need to visit specific site, enter their unique key and then reveal how much bitcoins they need to pay. As we have said, delaying this may increase the amount of ransom and instead of 500 dollars you may have to pay a 1000 dollars in bitcoins.
If you need to remove CryptoDefense from your computer, we highly recommend using a guide below. Also, you should start thinking about the prevention of such infections. For that you can use previously mentioned programs. Besides, don't forget to think about the immunity of your files and backup. For that you can use USB external hard drives, CDs, DVDs, or simply rely on online backups, such as Google Drive, Dropbox, Flickr and other solutions.
Finally, read this post and know more details how to avoid Cryptolocker and other ransomware viruses:
Log in to your infected account and start the browser. Download SpyHunter or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete CryptoDefense removal.
If your ransomware is blocking Safe Mode with Networking, try further method.
After restoring your system, you should remove all malicious files that belong to CryptoDefense because they are still on your computer. For that, download SpyHunter and scan your PC.
If you have individual files to decrypt, now it’s time to use Windows Previous Versions feature. For that, select a file, right click on it and select Properties. Now go to Previous Versions tab and look for a restore point of your file. Select it if it’s there and click Restore. Beware! This method is effective only after enabling the System Restore function. Besides, if your ransomware is designed to remove Shadow Volume Copies of the files, it may fail to work for you. In this case, try Photorec or R-studio..
Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from CryptoDefense and other ransomwares, use a reputable anti-spyware, such as SpyHunter, STOPzilla or Malwarebytes Anti Malware
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Information added: 08/07/15 03:45;
information updated: 08/07/15 03:45