If you discover that your computer is infected with CTB Locker you should immediately scan your computer with an anti-virus or anti-malware program. What should you do when you discover your computer is infected with CTB Locker The only way to recover these files so that they show the original, and correct, information is to restore them in some manner or pay the ransom. If you do attempt to open a file with a program, the program may state that it is corrupted or just display garbled text on the screen. There is no way to open an encrypted file unless you first decrypt it by paying the ransom. Therefore, these files are simply your normal data files that have been encrypted. CTB2, while newer ones are using a random extension such as. Older versions of CTB-Locker would change the file extension to. When you become infected with CTB Locker or Critroni, the infection will encrypt your files and then rename them to a new extension. What are these new extensions like CTBL or CTB2 that are added to the encrypted files? Therefore, it will not be unusual to find numerous copies of the same executable under different names located in the %Temp% folder. Last, but not least, each time you reboot your computer, the malware will copy itself to a new name under the %Temp% folder and then create a new task scheduler job to launch it on login. This technique makes it more difficult, but not impossible, for law enforcement to track down the location of the C2 servers. More information about the ransom site will be discussed later in this guide.Īnother uncommon characteristic of this infection is that it will communicate with its Command & Control Server directly via TOR rather than going over the Internet.
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%MyDocuments%\.html that also contain instructions on how to access the malware's site in order to pay the ransom. Finally it will also create the files %MyDocuments%\DecryptAllFiles. bmp file, which contains further instructiosn on how to pay the ransom. It will also change your wallpaper to be the %MyDocuments%\AllFilesAreLocked. When the malware has finished scanning your drives for data files and encrypting them it will display a ransom screen that includes instructions on how to pay the ransom. When CTB Locker detects a supported data file it will encrypt it using elliptical curve cryptography, which is unique to this ransomware infection. In summary, if there is a drive letter on your computer it will be scanned for data files by CTB Locker. When the infection is scanning your computer it will scan all drive letters on your computer including mapped drives, removable drives, and mapped network shares. Once infected the CTB Locker will scan your computer's drives for data files and encrypt them. It will then create a hidden random named job in Task Schedule that launches the malware executable every time you login. When you become infected with the CTB Locker infection, the malware will store itself in the %Temp% folder as a random named executable. This ransom amount is equivalent to approximately $120.00 USD. The infection will then open a ransom screen that states that your data was encrypted and prompts you to follow the instructions on the screen to learn how to purchase and pay the ransom of. The current version now adds a random file extension to encrypted files. In the past any file that was encrypted would have its file extension changed to CTB or CTB2. When you are first infected with CTB Locker it will scan your computer for data files and encrypt them so they are no longer accessible. More information on how this malware is being sold can be found in Kafeine's article "Crypto Ransomware" CTB-Locker (Critroni.A) on the rise.
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With that said, expect to see other ransomware released using this kit, but possibly with different interfaces. As discovered by Kafeine, this malware also appears to be part of a kit being sold online for $3,000 USD, which includes support in getting it up and running. Just like other file encrypting malware, the media continues to affiliate this infection with CryptoLocker when in fact this appears to have been developed by a different group using new technologies such as elliptical curve cryptography and the malware communicating with the Command and Control server over TOR.
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CTB Locker (Curve-Tor-Bitcoin Locker), otherwise known as Critroni, is a file-encrypting ransomware infection that was released in the middle of July 2014 that targets all versions of Windows including Windows XP, Windows Vista, Windows 7, and Windows 8.