Coban ransomware is a new data locker malware that aims to corrupt sensitive data and extort ransom from the victims. Coban ransomware uses strong cipher algorithm to encode target files and make them completely inaccessible. Encrypted files can be recognized by the .coban extension appended at the end of their names. Then it displays a ransom note on the screen of the infected PC to inform victims about the attack and instruct them what they are expected to do in order to receive files back.
This article informs victims of Coban ransomware infection and provides comprehensive removal and data restore instructions.
Threat Summary
| Name | Coban |
| Type | Ransomware, Cryptovirus |
| Short Description | Encrypts the files on your computer, making them no longer openable. Asks for a ransom payment in Bitcoins. |
| Symptoms | Adds the .coban file extension to the encrypted files and changes their names to random names. Drops a ransom note, named _HELP_INSTRUCTION.txt. |
| Distribution Method | Spam Emails, Email Attachments, Executable files |
| Detection Tool |
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User Experience | Join Our Forum to Discuss Coban. |
| Data Recovery Tool | Windows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive. |
Coban Ransomware – Spread Techniques
Coban ransomware payloads can be spread via various distribution techniques. The most preferred one by cyber criminals is email messages with malicious attachments or infected elements like buttons and links placed in the email message body. Usually, the email messages are well crafted so they can easily trick users into infecting their computer systems with Coban ransomware. In most cases, the sender’s name and email address of the malicious emails are disguised as representatives of well-known business organizations, legal services, and even governmental institutions. And once the payload penetrates the system, it automatically triggers Coban ransomware infection.
In some cases, the ransomware may appear as fake software update notification that urges users to download a critical security patch. Additionally, the code of the malicious Coban crypto virus payload may be injected into web pages that are set to automatically start the download of the ransomware code on the PC. The links of these web pages may be included in malvertising campaigns or spread on social media channels.
Coban Ransomware – Infection Flow
The investigation of Coban ransomware samples is ongoing. Some security researchers believe that it can belong to the infamous CryptoMix ransomware family. This year our team detected and reported two other CryptoMix ransomware variants that are appending the .OGONIA and .EXTE extensions to the corrupted files.
The samples of Coban file locker affirm that it follows a typical ransomware pattern. The infection is triggered once a file named cc9b1e6806db5fb9628559162c3ebb62.virus is running on the system. Then Coban ransomware can connect with hackers’ controlled server and download all additional malware files it needs to complete the infection. Often the malicious files are situated in some of the following essential Windows system folders:
- %AppData%
- %Temp%
- %Roaming%
- %Common%
- %System32%
Coban ransomware processes may be disguised as legitimate Windows system processes like – svchost.exe and services.exe making its detection even harder. After the threat establishes all malicious files on the system, it is capable of modifying Windows registry values in order to ensure its automatic execution on each Windows boot up. The following registry keys may be plagued by Coban ransomware:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
At the end of the infection, Coban crypto virus drops its ransom note called _HELP_INSTRUCTION.txt on the computer. Then it displays it on the screen and informs the following:
All your files are already encrypted due to a vulnerability in the system!
For decoding it is necessary to pay ransom by bitcoins.
Bitcoins can be bought here – localbitcoins.com in many ways.
Write to us at mail ms.decry@aol.com and tell us your unique ID in the subject line. DECRYPT-ID-ea003afd-e55a-490a-bf5f-2e2f0db4e97b number
It is not known what is the amount of the demanded ransom, however, any negotiations with the crooks should be refrained so new troubles could be avoided.
Coban Ransomware – Data Encryption
Coban ransomware is believed to have the following file types in its target data list:
→.sql, .mp4, .7z, .rar, .m4a, .wma, .avi, .wmv, .csv, .d3dbsp, .zip, .sie, .sum, .ibank, .t13, .t12, .qdf, .gdb, .tax, .pkpass, .bc6, .bc7, .bkp, .qic, .bkf, .sidn, .sidd, .mddata, .itl, .itdb, .icxs, .hvpl, .hplg, .hkdb, .mdbackup, .syncdb, .gho, .cas, .svg, .map, .wmo, .itm, .sb, .fos, .mov, .vdf, .ztmp, .sis, .sid, .ncf, .menu, .layout, .dmp, .blob, .esm, .vcf, .vtf, .dazip, .fpk, .mlx, .kf, .iwd, .vpk, .tor, .psk, .rim, .w3x, .fsh, .ntl, .arch00, .lvl, .snx, .cfr, .ff, .vpp_pc, .lrf, .m2, .mcmeta, .vfs0, .mpqge, .kdb, .db0, .dba, .rofl, .hkx, .bar, .upk, .das, .iwi, .litemod, .asset, .forge, .ltx, .bsa, .apk, .re4, .sav, .lbf, .slm, .bik, .epk, .rgss3a, .pak, .big, wallet, .wotreplay, .xxx, .desc, .py, .m3u, .flv, .js, .css, .rb, .png, .jpeg, .txt, .p7c, .p7b, .p12, .pfx, .pem, .crt, .cer, .der, .x3f, .srw, .pef, .ptx, .r3d, .rw2, .rwl, .raw, .raf, .orf, .nrw, .mrwref, .mef, .erf, .kdc, .dcr, .cr2, .crw, .bay, .sr2, .srf, .arw, .3fr, .dng, .jpe, .jpg, .cdr, .indd, .ai, .eps, .pdf, .pdd, .psd, .dbf, .mdf, .wb2, .rtf, .wpd, .dxg, .xf, .dwg, .pst, .accdb, .mdb, .pptm, .pptx, .ppt, .xlk, .xlsb, .xlsm, .xlsx, .xls, .wps, .docm, .docx, .doc, .odb, .odc, .odm, .odp, .ods, .odt.
The list includes all file types that are frequently used by users to store important and valuable information. Each time the virus finds a target file, it encrypts it by utilizing strong cipher algorithm which makes the file no longer to be opened. Also, it renames the original names of the corrupted files and appends the extension .coban at the end.
Remove Coban Ransomware – Restore .coban Files
To sum up, Coban ransomware is a devastating infection that should be removed as soon as it is detected on the PC. Only after the complete Coban ransomware removal from the system, you can use it normally again. Otherwise, the ransomware will start its malicious files each time you start the PC, encrypt all your new files which are part of its target list and interrupt the regular system performance. The removal process of Coban ransomware can be done either manually or automatically. Both methods are presented in the step-by-step Coban ransomware removal guide below. Security researchers recommend the help of advanced anti-malware tool for maximum efficiency.
After the removal of Coban be advised to back up all encrypted files to an external drive and then proceed with the .coban files restore process which is also presented in the instructions below.
Gergana Ivanova
Gergana has a bachelor's degree in Marketing. She has been with the STF team for five years, researching malware, reporting on the latest computer infections, and following digital marketing trends.
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Attention! SensorsTechForum strongly recommends that all malware victims should look for assistance only by reputable sources. Many guides out there claim to offer free recovery and decryption for files encrypted by ransomware viruses. Be advised that some of them may only be after your money.
As a site that has been dedicated to providing free removal instructions for ransomware and malware since 2014, SensorsTechForum’s recommendation is to only pay attention to trustworthy sources.
How to recognize trustworthy sources:
- Always check "About Us" web page.
- Profile of the content creator.
- Make sure that real people are behind the site and not fake names and profiles.
- Verify Facebook, LinkedIn and Twitter personal profiles.
How to Remove Coban from Windows.
Step 1: Boot Your PC In Safe Mode to isolate and remove Coban
Step 2: Uninstall Coban 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. To do that:
Follow the instructions above and you will successfully uninstall most programs.
Step 3: Clean any registries, created by Coban on your computer.
The usually targeted registries of Windows machines are the following:
- HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
You can access them by opening the Windows registry editor and deleting any values, created by Coban there. This can happen by following the steps underneath:
Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.
Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode.
This will enable you to install and use SpyHunter 5 successfully.
Step 4: Scan for Coban with SpyHunter Anti-Malware Tool
Step 5 (Optional): Try to Restore Files Encrypted by Coban.
Ransomware infections and Coban 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.
Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.
Get rid of Coban from Mac OS X.
Step 1: Uninstall Coban 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 Coban 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:
→ ~/Library/LaunchAgents
/Library/LaunchDaemons
Tip: ~ is there on purpose, because it leads to more LaunchAgents.
Step 3 (Optional): Try to Restore Files Encrypted by Coban.
Ransomware infections and Coban 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.
Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.
Coban FAQ
What is Coban ransomware and how does it work?
Coban is a ransomware infection - the malicious software that enters your computer silently and blocks either access to the computer itself or encrypt your files.
Many ransomware viruses use sophisticated encryption algorithm how to make your files inaccessible. The goal of ransomware infections is to demand that you pay a ransom payment to get access to your files back.
How does Coban ransomware infect my computer?
Via several ways.Coban Ransomware infects computers by being sent via phishing e-mails, containing virus attachment.
This attachment is usually masked as an important document, like an invoice, bank document or even a plane ticket and it looks very convincing to users.
After you download and execute this attachment, a drive-by download occurs and your computer is infected with the ransomware virus.
Another way, you may become a victim of Coban is if you download a fake installer, crack or patch from a low reputation website or if you click on a virus link. Many users report getting a ransomware infection by downloading torrents.
How to open .Coban files?
You can't. At this point the .Coban files are encrypted. You can only open them once they are decrypted.
Decryptor did not decrypt my data. What now?
Do not panic and backup the files. If a decryptor did not decrypt your .Coban files successfully, then do not despair, because this virus is still new.
One way to restore files, encrypted by Coban ransomware is to use a decryptor for it. But since it's a new virus, advised that the decryption keys for it may not be out yet and available to the public. We will update this article and keep you posted as soon as this decryptor is released.
How Do I restore ".Coban" files (Other Methods)?
Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .Coban files.
These methods are in no way 100% guarantee that you will be able to get your files back. But if you have a backup, your chances of success are much greater.
How do I get rid of Coban ransomware virus?
The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti malware software. It will scan for and locate Coban ransomware and then remove it without causing any additional harm to your important .Coban files.
Also, keep in mind that viruses like Coban ransomware also install Trojans and keyloggers that can steal your passwords and accounts. Scanning your computer with an anti-malware software will make sure that all of these virus components are removed and your computer is protected in the future.
What to Do If nothing works?
There is still a lot you can do. If none of the above methods seem to work for you, then try these methods:
- Try to find a safe computer from where you can can login on your own line accounts like One Drive, iDrive, Google Drive and so on.
- Try to contact your friends, relatives and other people so that they can check if they have some of your important photos or documents just in case you sent them.
- Also, check if some of the files that were encrypted it can be re-downloaded from the web.
- Another clever way to get back some of your files is to find another old computer, a flash drive or even a CD or a DVD where you may have saved your older documents. You might be surprised what will turn up.
- You can also go to your email account to check if you can send any attachments to other people. Usually what is sent the email is saved on your account and you can re-download it. But most importantly, make sure that this is done from a safe computer and make sure to remove the virus first.
More tips you can find on our forums, where you can also asks any questions about your ransomware problem.
