THREAT REMOVAL

.Cobra Files Virus (Dharma Ransomware) – Remove and Restore Files

This article aims to help you by showing how to remove the latest variant of Dharma ransomware virus and restore files that have been encrypted with the .cobra file extension added to them.

A new variant of the notorious CrySiS ransomware variant, called Dharma Ransomware has reappeared and is likely to begin infecting computers all over the world. The virus may use the AES encryption algorithm to render important documents, images, videos and other types of files encrypted, meaning that they can no longer be opened, until they are unlocked with a specific decryption key. Since such key is only available to the creators of .cobra files virus, they ask from victims to make a ransom payment to get the files decrypted once again. If you are one of the victims of the .cobra Dharma ransomware, we recommend that you read this article immediately to learn how to effectively remove the .cobra ransomware variant of Dharma and how to try and recover most of your encrypted files without having to pay a hefty ransom.

Threat Summary

Name .cobra Virus
Type Ransomware, Cryptovirus
Short Description New variant of the notorious Dharma Ransomware, which derives from CrySiS virus family. Encrypts your files and then demands a rasnom to be paid to get them to work again.
Symptoms Files are encrypted with an added .cobra extension and become no longer accessible. A ransom note appears on the infected computer with ransom instructions.
Distribution Method Spam Emails, Email Attachments, Executable files
Detection Tool See If Your System Has Been Affected by malware

Download

Malware Removal Tool

User Experience Join Our Forum to Discuss .cobra Virus.
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.

.cobra Files Virus – Infection Process

In order to effectively infect a certain computer, the .cobra variant of Dharma ransomware uses very cunning tactics. The main of those accounts to over 80% of ransomware infections worldwide and is conducted via malicious e-mail spam. The way it works is that the cyber-criminals who are behind this variant of Dharma ransomware use deceitful techniques to convince unsuspecting victims in order to open a malicious e-mail attachment. They often pretend that the attachment being sent is a legitimate document, like:

  • An invoice of a purchase that the user does not recall in making.
  • A receipt of an order.
  • A banking statement.

The e-mails often contain convincing statements, like the following example:

Most of the files which are attached to those e-mails often are either directly the infection executable file or a Microsoft Office document, using malicious macros to trigger the infection process. This happens after you open the document and enable the macros yourself:

So far, there has been one .exe file, related to the infection with the .cobra files variant of Dharma ransomware and it has been reported by researcher Jakub Kroustek‏ (@JakubKroustek) to have the following parameters:

Dharma .cobra Ransomware Variant – Malicious Activity

When an infection with this variant of Dharma ransomware takes place, the SERVICE_2017-11-04_12-18.EXE infection file may connect silently to a remote C&C (Command and Control) server and from there download the payload of the .cobra files variant of Dharma. This payload consists of main executable, responsible for encryption process and other support files added alongside it. The malicious files may be dropped in the following Windows directories:

  • %AppData%
  • %Roaming%
  • %Local%
  • %LocalLow%
  • %Temp%

In addition to simply dropping files on your computer, the Dharma .cobra files variant may also modify the Run and RunOnce Windows registry sub-keys. They are responsible for the automatic running of the malicious executable of this virus that encrypts files. In them, a value string may be created with data in it, pointing out the exact name (which is often random) and location of the malicious file, belonging to the .cobra files variant of Dharma. The sub-keys are located in the Windows Registry Editor, more specifically in the following keys:

→ HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\

After it has been executed on your computer, this .cobra files iteration of Dharma ransomware aims to encrypt the files on your computer and make the file recovery process very difficult for you. To do this, the virus first deletes your backups and shadow volume copies by running the vssadmin and bceditcommands in the Windows Command Prompt silently:

→ vssadmin delete shadows /for={volume} /oldest /all /shadow={ID of the Shadow} /quiet

.cobra Files Virus – Encryption Process

For the encryption process, the .cobra files virus may use an advanced encryption technique, also used in it’s previous variants. Without going in to technical details, the most important thing to know about this encryption mode is that it alters the core structure code of the legitimate files on your computer with code from the encryption algorithm it uses. The virus does not replace the whole code of the file, however, but only a portion of it, like it’s header or footer, enough to make the file itself no longer openable. To encrypt files, the .cobra variant of Dharma ransomware has a pre-configured list in which it targets the most commonly used files on your computer, some of which are the following:

“PNG .PSD .PSPIMAGE .TGA .THM .TIF .TIFF .YUV .AI .EPS .PS .SVG .INDD .PCT .PDF .XLR .XLS .XLSX .ACCDB .DB .DBF .MDB .PDB .SQL .APK .APP .BAT .CGI .COM .EXE .GADGET .JAR .PIF .WSF .DEM .GAM .NES .ROM .SAV CAD Files .DWG .DXF GIS Files .GPX .KML .KMZ .ASP .ASPX .CER .CFM .CSR .CSS .HTM .HTML .JS .JSP .PHP .RSS .XHTML. DOC .DOCX .LOG .MSG .ODT .PAGES .RTF .TEX .TXT .WPD .WPS .CSV .DAT .GED .KEY .KEYCHAIN .PPS .PPT .PPTX ..INI .PRF Encoded Files .HQX .MIM .UUE .7Z .CBR .DEB .GZ .PKG .RAR .RPM .SITX .TAR.GZ .ZIP .ZIPX .BIN .CUE .DMG .ISO .MDF .TOAST .VCD SDF .TAR .TAX2014 .TAX2015 .VCF .XML Audio Files .AIF .IFF .M3U .M4A .MID .MP3 .MPA .WAV .WMA Video Files .3G2 .3GP .ASF .AVI .FLV .M4V .MOV .MP4 .MPG .RM .SRT .SWF .VOB .WMV 3D .3DM .3DS .MAX .OBJ R.BMP .DDS .GIF .JPG ..CRX .PLUGIN .FNT .FON .OTF .TTF .CAB .CPL .CUR .DESKTHEMEPACK .DLL .DMP .DRV .ICNS .ICO .LNK .SYS .CFG”

The .cobra files variant of Dharma is also very careful not to encrypt any files in the %Windows% folder or other system directories. After the encryption process is complete, which usually takes couple of seconds, the .cobra extension is added to the files along with the e-mail to contact the cyber-criminals. An encrypted file by this Dharma ransomware variant may appear in the format below:

How to Remove .cobra Files Virus and Restore Encrypted Files

In order to remove this iteration of Dharma ransomware, you should follow the step-by-step removal instructions below. They are specifically organized in order to help you isolate and then delete Dharma ransomware. While those instructions are divided in manual and automatic removals, be advised that most ransomware researchers often advise removing dangerous malware, like the .cobra files variant of Dharma automatically, while using an advanced anti-malware software which will scan for them and remove any trace of the malware safely and quickly.

Furthermore, if you want to restore files that have been encrypted with the .cobra file extension, we advise you to check out the alternative file recovery methods which we have suggested below in step “2. Restore files encrypted by .cobra Virus” below. They may not be 100% effective to recover all the files, but may help you restore a lot of your encoded data without you having to pay the ransom yourself.

Avatar

Ventsislav Krastev

Ventsislav is a cybersecurity expert at SensorsTechForum since 2015. He has been researching, covering, helping victims with the latest malware infections plus testing and reviewing software and the newest tech developments. Having graduated Marketing as well, Ventsislav also has passion for learning new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management, Network Administration and Computer Administration of System Applications, he found his true calling within the cybersecrurity industry and is a strong believer in the education of every user towards online safety and security.

More Posts - Website

Follow Me:
Twitter


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.


OFFER

REMOVE IT NOW (PC)
with Anti-Malware
We recommend you to download SpyHunter and run free scan to remove all virus files on your PC. This saves you hours of time and effort compared to doing the removal yourself.
SpyHunter 5 free remover allows you, subject to a 48-hour waiting period, one remediation and removal for results found. Read EULA and Privacy Policy


Windows Mac OS X

How to Remove .cobra Virus from Windows.


Step 1: Boot Your PC In Safe Mode to isolate and remove .cobra Virus

OFFER

Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your PC with SpyHunter

Keep in mind, that 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 our SpyHunter 5 review. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria

1. Hold Windows key() + R


2. The "Run" Window will appear. In it, type "msconfig" and click OK.


3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".
Tip: Make sure to reverse those changes by unticking Safe Boot after that, because your system will always boot in Safe Boot from now on.


4. When prompted, click on "Restart" to go into Safe Mode.


5. You can recognise Safe Mode by the words written on the corners of your screen.


Step 2: Uninstall .cobra Virus 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:


1. Hold the Windows Logo Button and "R" on your keyboard. A Pop-up window will appear.


2. In the field type in "appwiz.cpl" and press ENTER.


3. This will open a window with all the programs installed on the PC. Select the program that you want to remove, and press "Uninstall"
Follow the instructions above and you will successfully uninstall most programs.


Step 3: Clean any registries, created by .cobra Virus 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 .cobra Virus there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.


2. When you open it, you can freely navigate to the Run and RunOnce keys, whose locations are shown above.


3. You can remove the value of the virus by right-clicking on it and removing it.
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.

IMPORTANT!
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 .cobra Virus with SpyHunter Anti-Malware Tool

1. Click on the "Download" button to proceed to SpyHunter's download page.


It is recommended to run a scan before purchasing the full version of the software to make sure that the current version of the malware can be detected by SpyHunter. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria.


2. After you have installed SpyHunter, wait for it to update automatically.

SpyHunter5-update-2018


3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.

SpyHunter5-Free-Scan-2018


4. After SpyHunter has finished scanning your PC for any files of the associated threat and found them, you can try to get them removed automatically and permanently by clicking on the 'Next' button.

SpyHunter-5-Free-Scan-Next-2018

If any threats have been removed, it is highly recommended to restart your PC.

Step 5 (Optional): Try to Restore Files Encrypted by .cobra Virus.

Ransomware infections and .cobra Virus 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.

1. Download the reccomended Data Recovery software by clicking on the link underneath:

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.


Windows Mac OS X

Get rid of .cobra Virus from Mac OS X.


Step 1: Uninstall .cobra Virus and remove related files and objects

OFFER
Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your Mac with SpyHunter for Mac
Keep in mind, that SpyHunter for Mac needs to purchased to remove the malware threats. Click on the corresponding links to check SpyHunter’s EULA and Privacy Policy


1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:


2. Find Activity Monitor and double-click it:


3. In the Activity Monitor look for any suspicious processes, belonging or related to .cobra Virus:

Tip: To quit a process completely, choose the “Force Quit” option.


4. Click on the "Go" button again, but this time select Applications. Another way is with the ⇧+⌘+A buttons.


5. In the Applications menu, look for any suspicious app or an app with a name, similar or identical to .cobra Virus. If you find it, right-click on the app and select “Move to Trash”.


6: Select Accounts, after which click on the Login Items preference. Your Mac will then show you a list of items that start automatically when you log in. Look for any suspicious apps identical or similar to .cobra Virus. Check the app you want to stop from running automatically and then select on the Minus (“-“) icon to hide it.


7: Remove any left-over files that might be related to this threat manually by following the sub-steps below:

  • 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 .cobra Virus 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:

Disclaimer! If you are about to tamper with Library files on Mac, be sure to know the name of the virus file, because if you delete the wrong file, it may cause irreversible damage to your MacOS. Continue on your own responsibility!

1: Click on "Go" and Then "Go to Folder" as shown underneath:

2: Type in "/Library/LauchAgents/" and click Ok:

3: Delete all of the virus files that have similar or the same name as .cobra Virus. If you believe there is no such file, do not delete anything.

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.


Click the button below below to download SpyHunter for Mac and scan for .cobra Virus:


Download

SpyHunter for Mac



Step 3 (Optional): Try to Restore Files Encrypted by .cobra Virus.

Ransomware infections and .cobra Virus 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.

1. Download the reccomended Data Recovery software by clicking on the link underneath:

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.


.cobra Virus FAQ

What is .cobra Virus ransomware and how does it work?

.cobra Virus 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 .cobra Virus ransomware infect my computer?

Via several ways..cobra Virus 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 .cobra Virus 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 ..cobra Virus files?

You can't. At this point the ..cobra Virus 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 ..cobra Virus files successfully, then do not despair, because this virus is still new.

One way to restore files, encrypted by .cobra Virus 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 "..cobra Virus" files (Other Methods)?

Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore ..cobra Virus 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 .cobra Virus 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 .cobra Virus ransomware and then remove it without causing any additional harm to your important ..cobra Virus files.

Also, keep in mind that viruses like .cobra Virus 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.

Leave a Comment

Your email address will not be published. Required fields are marked *

Time limit is exhausted. Please reload CAPTCHA.

Stay tuned
Subscribe for our newsletter regarding the latest cybersecurity and tech-related news.