CTB-Locker (Critoni) Ransomware

CTB-Locker (Critoni) Ransomware Description

Critoni Ransomware Image 1The Critoni Ransomware (also known as CTB-Locker or Curve-Tor-Bitcoin Locker) is a file encryptor Trojan that uses the Tor browser to obfuscate its network activity with its Command & Control servers. While the Critoni Ransomware's technical innovations are noteworthy, for its victims, the Critoni Ransomware endangers their files in much the same ways as other ransomware, with a demanded payment for file restoration. Proper data backup strategies can mitigate the effects of a Critoni Ransomware attack, and anti-malware tools should be used to delete the Critoni Ransomware, and all related threats, as soon as possible.

What a Trojan's Anonymity Means for You

The Critoni Ransomware is one of the various file encryption Trojans that may install themselves through software vulnerabilities leveraged in attacks, which tend to be implemented by Web-based threats like the Angler Exploit Kit. Just like the Critoni Ransomware's installation rarely requires any consent from its victims, its attacks also take place automatically, targeting and encrypting specific file types on your PC. Documents, images and audio files all may be made unreadable, with the Critoni Ransomware's warning TXT files claiming the use of a nigh-unbreakable elliptic curve formula in the process.

Along with asking its victims for a Tor-based payment plan to return their files to them, the Critoni Ransomware also initiates communications with a C&C server. This function could let the Critoni Ransomware receive instructions for other attacks or transmit information. The Trojan implements this feature in a semi-innovative fashion, by using Tor to prove anonymity to the C&C servers, as well. Other threats have pioneered that technique, including banking Trojans, but malware experts have yet to see any other file encrypting Trojans using the Critoni Ransomware's anonymity methodology.

In practice, this anonymity could make it more difficult for PC security researchers to disrupt the Critoni Ransomware's server infrastructure, or assist law enforcement with apprehending the Critoni Ransomware's administrators. The Critoni Ransomware's admins are not necessarily the same individuals as its coders; the Critoni Ransomware has been seen being sold to third parties on suspicious forums for sums of three thousand USD.

Getting Your Files Off of Critoni Ransomware's Curve

While the Critoni Ransomware does boast of an exceptionally strong encryption algorithm that would make decryption difficult, there are other means of preserving your files from a file encryptor Trojan's attacks. For these reasons, malware researchers always recommend that PC users with irreplaceable data use remote file backups in conjunction with removable hard drives, cloud services, and similar storage options.

Deleting the Critoni Ransomware, itself, always should be done by dedicated anti-malware software. The Critoni Ransomware continues to be in active development and may be used by third parties with a variety of infection strategies, which may use variable, third-party threats. Accordingly, your anti-malware tools should be updated for detecting the latest threats while scanning for the Critoni Ransomware. Although the Critoni Ransomware does include a self-deletion function for unpaid ransom scenarios, victims shouldn't hope for this capability to trigger and disinfect their PCs.

Unlike some, more limited file encryptors, the Critoni Ransomware also may attack PCs that lack active Internet connections. While the Critoni Ransomware has been given visibility in news headlines for its novel C&C server communications, these communications don't appear to be mandatory for carrying out its payload.

Infection rates for CTB-Locker are increasing at alarming rates. We have found where the method of CTB-Locker encrypting files will ultimately make those files useless and they cannot be decrypted by any method, even by paying the fine through the offered payment via CTB-Locker's lock screen.

Aliases: Inject2.BJOA [AVG], W32/Filecoder.EB!tr [Fortinet], Win32/Filecoder.EB, Trojan.Inject, Trojan/Win32.Necurs [AhnLab-V3], Trojan/Win32.Inject [Antiy-AVL], TR/Crypt.Xpack.122199, Trojan/Generic.bpoke, W32/Trojan.MAZW-6845, Mal/Wonton-AF [Sophos], BehavesLike.Win32.PWSZbot.fh [McAfee-GW-Edition], Trojan.Inject.Win32.124416, Trojan.Encoder.853 [DrWeb], TrojWare.Win32.Amtar.amu [Comodo] and Trojan.GenericKD.2055176 (B).

Technical Information

Screenshots & Other Imagery

CTB-Locker (Critoni) Ransomware Image 1 CTB-Locker (Critoni) Ransomware Image 2

File System Details

CTB-Locker (Critoni) Ransomware creates the following file(s):
# File Name Size MD5 Detection Count
1 %TEMP%ochzigh.exe 704,000 803f9c1091e5ca6dc3e9aa90172e0bf4 5
2 %TEMP%wzremvn.exe 345,088 10f0eaa794f48ad0b15034e0683cb15f 3
3 %TEMP%jkylgdbirzboad.exe 749,242 015fb9d19a20ba42e5c3b758668d4563 3
4 %TEMP%eugqrwi.exe 697,344 49e988b04144b478e3f52b2abe8a5572 2
5 %TEMP%fzageih.exe 705,024 789b5189c029697c993071aeba3cbc58 2
6 %TEMP%kzjyswn.exe 704,512 14c0558c757c93465eccbbd77d58bbf3 2
7 %TEMP%cjdolsd.exe 704,512 b4e5dec85e9b7eec2a8b2b1addceb8ab 2
8 %TEMP%xlejyim.exe 669,696 adb0de790bd3fb88490a60f0dddd90fa 2
9 %TEMP%kb04009100.exe 729,088 18dfcf3479bbd3878c0f19b80a01e813 1
10 %TEMP%bqnvgig.exe 706,560 4ebd076047a04290f23f02d6ecd16fee 1
11 %USERPROFILE%\Desktop\7ea9e7d0e7314c2ab5c23b100f60365d\wylam_invoice_2015_01_20-15_42.scr 41,984 0ab519048a9173de2edf95294a2a68bd 1
12 %WINDIR%ygehnnol.exe 286,720 7027a7ee4fbcb26f1d039035ebd0dca5 1
13 %TEMP%ljchyff.exe 757,434 7aaa4bd1c2ca44174f17f06deb6221ff 1
14 %MyDocuments%\DecryptAllFiles [USER ID].txt N/A
15 %MyDocuments%\AllFilesAreLocked [USER ID].bmp N/A
16 %MyDocuments%\[RANDOM].html N/A
17 %WinDir%\Tasks\[RANDOM].job N/A
18 %Temp%\[RANDOM].exe N/A
19 C:\[RANDOM]\[RANDOM].exe N/A
20 C:\Users\[USER]\AppData\Local\[RANDOM].exe N/A
21 C:\Documents and Settings\[USER]\Application Data\[RANDOM].exe N/A
22 C:\Documents and Settings\[USER]\Local Application Data\[RANDOM].exe N/A
23 file-7938054_EXE 657,408 6092ec1035366851a8c8e80442b1245a 0
24 488d401ab2659cb237aef2675a862d918b6c30b52c88f4458e0a7305a5d676bb.exe 39,424 268e27e693c9e1ba00d9cf42439d835b 0
25 79da125e30253ddcfed484223682af6430227fb6de9a3d9fc13d92ff9517d6a6.exe 708,608 8a62bed88959a8bc5de1bc4d4555fb64 0
26 brittlely.scr 29,696 61637ebf2ec4e4baffc6f18e9f00bde9 0
27 captec_invoice_2015_01_20-16_06.scr 41,472 2cab826c558bb3a24894c590bfca8a9b 0
28 chapman_invoice_2015_01_20-16_01.scr 41,984 4d2c78c273fa23d78624251f2059538d 0
29 enkindle.scr 29,696 57fab926134689e12513811a63c61946 0
30 flowserve_invoice_2015_01_20-15_51.scr 40,448 63147780369571c64bdd55084c5c4857 0
31 ford_invoice_2015_01_20-15_47.scr 40,960 153c6d9d91fe78b70b336bd2688d777a 0
32 file.exe 69,632 cb7c20c9de1b4ff2fa72ffc300311988 0
More files

Registry Details

CTB-Locker (Critoni) Ransomware creates the following registry entry or registry entries:
Regexp file mask
%userprofile%\documents\[RANDOM CHARACTERS]Decrypt-All-Files[RANDOM CHARACTERS]
%userprofile%\documents\Decrypt All Files[RANDOM CHARACTERS].bmp
Registry key
SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree\System Components Update
SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree\System Security
HKEY_CURRENT_USER\Control Panel\Desktop "Wallpaper" = "%MyDocuments%\AllFilesAreLocked [USER ID].bmp"

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Enigmasoftware.com is not associated, affiliated, sponsored or owned by the malware creators or distributors mentioned on this article. This article should NOT be mistaken or confused in being associated in any way with the promotion or endorsement of malware. Our intent is to provide information that will educate computer users on how to detect, and ultimately remove, malware from their computer with the help of SpyHunter and/or manual removal instructions provided on this article.

This article is provided "as is" and to be used for educational information purposes only. By following any instructions on this article, you agree to be bound by the disclaimer. We make no guarantees that this article will help you completely remove the malware threats on your computer. Spyware changes regularly; therefore, it is difficult to fully clean an infected machine through manual means.

One Comment

  • Scott:

    My name is Scott. I am a professional photographer from Michigan. On August 11, 2015 my computer was infiltrated by hackers utilizing an advanced and evolving hacking and data encryption program. It is not the only one of its kind, however the bad guys are continuing to invent new and more powerful ways to separate people and companies from the things they need the most. It is something that never should happen. It is wrong what these people do and they are doing it every day. They are doing it as I write this. They call it RANSOMWARE. It is a word I myself, a common computer user, had not hear of.
    These programs go by different names. They all do about the same thing, which is to lock you out of your own computer and/or render files on your hard drive inaccessible to you and most people on the planet incidentally. It is a troublesome and disturbing new trend in cybercrime and I feel law enforcement and our government are NOT doing nearly enough to combat these people and their very REAL weapons.
    They seem to be targeting at random. Individuals, Small businesses, and even law enforcement its self. There is a new shared danger in this fluid situation that is different from other computer virus programs in that even with the best protection the government has at its disposal there are people who know how to break in. Once one of these RANSOMWARE programs is able to upload onto your system you may never know it is there until it strikes. When it does, it is very fast and there is nothing you can do to stop it. Your file icons will flicker and disappear. You will see this happen as I did. The files will reappear, but in an encrypted format that MOST people will never break, it seems. You will need to know a lot about computer CODE and DECRYPTION.
    If you start to see your files going away the only thing you can do is unplug your system from the wall or shit it immediately down as fast as u can. Just hit the button!! In some cases doing an immediate system restore and/or factory restore can assist in the recovery of files. It depends a lot on when your last hard drive RESTORE POINT was made. That is something you should often do, particularly if you do a lot of work on your computer and have more files you are dealing with.
    The best thing you can do keep updated copies of important material. On CD as well as computer that is NOT connected at all to the internet. That is want I mostly do. I have computers for networking and I have other for editing and other things. It is best to keep things separate, now more than ever.
    As of this writing there is no decryption for the version of this virus program that has locked my files from me. It is called CTB-LOCKER. It uses RSA-2048 ENCRYPTION. Please feel free to google these things so you can learn more about what these programs really are, how they work and how dangerous they really are. Or google RANSOMWARE. I am hopeful that one day soon they will catch these evil people, or the good guys will come up with a solution. Some of these people have actually stopped and released their CODES so people could actually retrieve their data, but every situation is different and no one can say for sure if decryption will ever happen. I know there are a lot of people out there like me who have been victimized by these evil people and I want them to know that I feel their pain. I want to see these evil bad people in court. I want them to know that they have HURT PEOPLE and I want to see them go away for the rest of their lives.
    I want to thank Roxy Lopez again for her courage in taking on this global issue and I thank here again for her time. Hopefully together we can get this very serious issue into a greater light and maybe the bad guys will have less places to hide.

    Scott Matthew Smith

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