CryptoFortress Description

CryptoFortress is a ransomware threat the takes over an infected computer and encrypts its files. This has become a common tactic for ransomware developers because the encryption is nearly impossible to break without the decryption key. This means that even if CryptoFortress is removed from the infected computer, the files remain encrypted. This allows third parties to ask for a ransom, threatening computer users by withholding access to the encrypted files. CryptoFortress may spread through corrupted email messages containing threatening file attachments or disguised into embedded links which may lead to attack websites. CryptoFortress also may be spread using fake file downloads, such as bogus updates for Flash player or fake media players. Once CryptoFortress has been successfully delivered to the victim's computer, all files on the infected computer are encrypted.

The people behind CryptoFortress will demand payment of a ransom from the victim in order to decrypt the affected files. Currently, the CryptoFortress demands one Bitcoin in order to decrypt the files. Bitcoin, being anonymous, is especially suited for these types of instances. Bitcoin prices have varied wildly in the last few years. As of the writing of this, one Bitcoin was worth approximately $310 USD. There are many threats that carry out this same attack with small variations to the process. CryptoFortress is very similar to TorrentLocker, another ransomware threat. In fact, CryptoFortress and Torrentlocker use similar Web pages and source code, making it likely that the same people are responsible for both.

How CryptoFortress Infects a Computer

CryptoFortress searches for supported data files on the victim's computer. CryptoFortress will look for pictures, videos and documents since these tend to have data that is important for the computer user and hard to replace. CryptoFortress then creates a copy of the file and adds the FRTRSS extension (.frtrss added to the end of the file's name). CryptoFortress then encrypts the file before restoring its original name and extension. Victims of CryptoFortress are allowed to decrypt two small files with no charge to demonstrate that the people responsible for CryptoFortress are capable of decrypting the affected files. CryptoFortress demands a ransom from the victim in order to decrypt the rest. Paying CryptoFortress' ransom allows third parties to continue carrying out their attacks. If you have a way to avoid the payment (for example, a backup of your files), it is recommended to avoid paying the fee to restore the files.

CryptoFortress targets files with the following extensions: .unity3d, .blob, .wma, .avi, .rar, .DayZProfile, .doc, .odb, .asset, ,forge, .cas, .map, .mcgame, .rgss3a, .big, .wotreplay, .xxx, .m3u, .png, .jpeg, .txt, .crt, .x3f, .ai, .eps, .pdf, .lvl, .sis, .gdb. Note that many of these files extensions represent game saved files, meaning that CryptoFortress targets computer users engaged in computer games purposefully, halting their progress until they pay CryptoFortress' fee. Currently, there is no way of restoring the encrypted files without a decryption key. Considering this, you should protect yourself from falling prey to these types of attacks by maintaining regular file backups on a separate device or on the cloud.

Protecting Yourself from a CryptoFortress Attack

CryptoFortress spreads using typical threat delivery methods. Some examples of how CryptoFortress may be spread include spam email attachments, attack websites and fake file downloads. Although a reliable security program is essential in halting CryptoFortress attacks, knowing how to stay safe while browsing the Web is just as important. Some things to remember when avoiding threat attacks like CryptoFortress include the following:

  • Stay away from suspicious websites. High-risk websites include pornographic websites and file sharing networks.
  • Avoid peer-to-peer file sharing and pirated software or other media.
  • Never open unknown files or links, even if they come from an email address that appears to be trusted.

Do You Suspect Your PC May Be Infected with CryptoFortress & Other Threats? Scan Your PC with SpyHunter

SpyHunter is a powerful malware remediation and protection tool designed to help provide PC users with in-depth system security analysis, detection and removal of a wide range of threats like CryptoFortress as well as a one-on-one tech support service. Download SpyHunter's FREE Malware Remover
Note: 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 more on SpyHunter. Free Remover allows you to run a one-off scan and receive, subject to a 48-hour waiting period, one remediation and removal. Free Remover subject to promotional details and Special Promotion Terms. To understand our policies, please also review our EULA, Privacy Policy and Threat Assessment Criteria. If you no longer wish to have SpyHunter installed on your computer, follow these steps to uninstall SpyHunter.

Security Doesn't Let You Download SpyHunter or Access the Internet?

Solutions: Your computer may have malware hiding in memory that prevents any program, including SpyHunter, from executing on your computer. Follow to download SpyHunter and gain access to the Internet:
  • Use an alternative browser. Malware may disable your browser. If you're using IE, for example, and having problems downloading SpyHunter, you should open Firefox, Chrome or Safari browser instead.
  • Use a removable media. Download SpyHunter on another clean computer, burn it to a USB flash drive, DVD/CD, or any preferred removable media, then install it on your infected computer and run SpyHunter's malware scanner.
  • Start Windows in Safe Mode. If you can not access your Window's desktop, reboot your computer in "Safe Mode with Networking" and install SpyHunter in Safe Mode.
  • IE Users: Disable proxy server for Internet Explorer to browse the web with Internet Explorer or update your anti-spyware program. Malware modifies your Windows settings to use a proxy server to prevent you from browsing the web with IE.
If you still can't install SpyHunter? View other possible causes of installation issues.

Technical Information

File System Details

CryptoFortress creates the following file(s):
# File Name Size MD5
1 DirCryptoFortress __ 2015-03-12.exe 228,864 e6dda3e06fd32fc3670d13098f3e22c9
More files

Registry Details

CryptoFortress creates the following registry entry or registry entries:
Regexp file mask
%ALLUSERSPROFILE%\Application Data\Microsoft\Windows\Start Menu\Programs\Startup\READ IF YOU WANT YOUR FILES BACK.html
%ALLUSERSPROFILE%\Microsoft\Windows\Start Menu\Programs\Startup\READ IF YOU WANT YOUR FILES BACK.html
%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\READ IF YOU WANT YOUR FILES BACK.html
%USERPROFILE%\Microsoft\Windows\Start Menu\Programs\Startup\READ IF YOU WANT YOUR FILES BACK.html

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