Remove DMA Locker 4.0 Ransomware and Restore AES and RSA Encrypted Files

by Ventsislav Krastev | May 25, 2016 | 0 Comments AES Encryption Algorithm, DMA Locker 4, malware, ransomware, RSA Encryption Algorithm

The latest by the notorious malware variants DMA Locker is now here, and it means business. Dubbed “!DMALOCK4.0” In its hex prefix, the 4th version of the ransomware uses two ciphers to encrypt the files of infected users – AES and RSA algorithms. The encrypted files do not have any extension, and a scary ransom message appears with a padlock picture to motivate infected victims to pay the 1 BitCoin ransom money. Since there is no guarantee that paying the ransom will get the files decrypted it is strongly advisable NOT to pay anything and remove DMA Locker 4.0 from the affected PC, instructions for which you may find below. If you want to restore your files, we strongly advise reading this article for more information on your options.

Threat Summary

Name	DMA Locker 4.0
Type	Ransomware
Short Description	The ransomware encrypts files with the RSA-4096 algorithm and AES-256 ciphers and asks a ransom for decryption.
Symptoms	Files are encrypted and become inaccessible. A ransom note with instructions for paying the ransom shows as a “cryptinfo.txt” file.
Distribution Method	Spam Emails, Email Attachments, File Sharing Networks.
Detection Tool	See If Your System Has Been Affected by malware Download Malware Removal Tool
User Experience	Join our forum to Discuss DMA Locker 4.0 Ransomware.
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.

DMA Locker 4.0 Distribution

The notorious DMA Locker did not change much when it comes to its spread. It still uses a malicious .exe process that is most likely obfuscated to avoid anti-malware detection. The cyber-threat has even been reported to hide its malicious .exe files, as PDF documents, like the example posted below:

This suggests that the ransomware may have been spread via malicious spam mails sent out to users written to convince them to either open an attachment or click on a malicious URL. Researchers have successfully detected that a Neutrino exploit kit has been used to spread DMA Locker 4.0 suggesting that it may be spread primarily via URLs posted online or in spam messages.

DMA Locker 4.0 In Detail

Once DMA Locker has confirmed successful infection by connecting to the C&C (Command and Control) center of the cyber-criminals, the cyber-threat drops the following malicious files in %Program Data%:

A “select.bat” file

This file may be used to delete the shadow volume copies of the infected computer, by executing an escalated privilege command, called “delete shadows”:

→ “vssadmin delete shadows /for={Volume of the drive} /all”

The other function of “select.bat” has been reported to be to display the “cryptinfo.txt” file on system startup.

Furthermore, the select.bat file may add registry entries that contain names such as “Windows Firewall” or “Windows Update”.

A “cryptinfo.txt” file

This file is most likely the ransom message which may be displayed every time you boot Windows. The ransom message is as follows:

→ ! ! ! ATTENTION ! ! !
ALL YOUR FILES HAVE BEEN ENCRYPTED!
– IF YOU WAN TO RECOVER YOUR FILES
FOLLOW THE INSTRUCTIONS AT THIS WEBSITE:
http://5.8.63.31/crypto/client_payment_instructions?botID={UNIQUE ID OF VICTIM PC HERE}

A “svchosd.exe” application:

This application is most likely the encryptor. It may run on system startup and encrypt files with the following file extensions:

→ “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”Source:fileinfo.com

The ransomware uses two algorithms to encrypt the files AES and RSA ciphers.

To understand how the files are encrypted, please visit the following related article:
Ransomware Encryption Explained – Why Is It So Effective?

The encrypted files do not have any extension set on them, but they are still inaccessible. After encryption, Malwarebytes has reported that DMA Locker 4.0 displays the following window:

DMA Locker – The Good News

The good news about DMA Locker is that it requires internet access to send the RSA encrypted AES key for decryption of the files. This is an opportunity, because if the ransomware infects your computer and you stop the connection during the infection process, it will not encrypt your files.

It may also be an opportunity to decrypt your files if you are a bit too late. Since the ransomware sends the key via internet connection, this means that it opens up a port on the infected machine. This represents a good opportunity to get the key using a network sniffer to sniff information from the packets of data sent to the malicious C&C server.

For more information on how to use Wireshark to restore your files, see the following article:
Use Wireshark to Decrypt Encoded Files by Ransomware

Removing DMA Locker 4.0

Whatever the case may be for you, it is almost imperative to remove DMA Locker 4.0 from your PC. This can happen by following the step-by-step instructions prepared for you below. They also contain alternative methods that may help you restore at least a small portion of your files.

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.

How to Remove DMA Locker 4.0 from Windows.

Step 1: Boot Your PC In Safe Mode to isolate and remove DMA Locker 4.0

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 DMA Locker 4.0 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 DMA Locker 4.0 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 DMA Locker 4.0 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 DMA Locker 4.0 with SpyHunter Anti-Malware Tool

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

Download

Malware Removal Tool

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.

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

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.

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

Step 5 (Optional): Try to Restore Files Encrypted by DMA Locker 4.0.

Ransomware infections and DMA Locker 4.0 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:

EaseUS Data Recovery Software

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 DMA Locker 4.0 from Mac OS X.

Step 1: Uninstall DMA Locker 4.0 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 DMA Locker 4.0:

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 DMA Locker 4.0. 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 DMA Locker 4.0. 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 DMA Locker 4.0 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 DMA Locker 4.0. 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 DMA Locker 4.0:

Download

SpyHunter for Mac

Step 3 (Optional): Try to Restore Files Encrypted by DMA Locker 4.0.

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

EaseUS Data Recovery Software

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.

DMA Locker 4.0 FAQ

What is DMA Locker 4.0 ransomware and how does it work?

DMA Locker 4.0 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 DMA Locker 4.0 ransomware infect my computer?

Via several ways.DMA Locker 4.0 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 DMA Locker 4.0 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 .DMA Locker 4.0 files?

You can't. At this point the .DMA Locker 4.0 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 .DMA Locker 4.0 files successfully, then do not despair, because this virus is still new.

One way to restore files, encrypted by DMA Locker 4.0 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 ".DMA Locker 4.0" files (Other Methods)?

Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .DMA Locker 4.0 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 DMA Locker 4.0 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 DMA Locker 4.0 ransomware and then remove it without causing any additional harm to your important .DMA Locker 4.0 files.

Also, keep in mind that viruses like DMA Locker 4.0 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.