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Remove Mailto ransomware (Virus Removal Guide) - Bonus: Decryption Steps

removal by Linas Kiguolis - - | Type: Ransomware

Mailto ransomware is a file locking malware which appends a random extension to personal files and makes them unusable

Mailto ransomware

Mailto ransomware, otherwise known as Kokoklock ransomware, is malware that was first spotted in early September 2019.[1] This file-locking virus does not seem to have any relations to other ransomware families but has the same goal – money extortion. Fortunately, Mailto virus is recognized by nearly over 50 security applications,[2] so its termination can be performed without any troubles.

Once inside the system, Mailto ransomware looks for videos, pictures, documents, databases, music, and other personal files to perform encryption on. Using a Salsa20 cipher, it then marks data with a random appendix that usually consists of six characters (numbers and letters, for example, .1be018 .d0e731). A ransom note [file extension]-Readme.txt is also dropped, which explains that users have to email crooks via kokoklock@cock.li or pabpabtab@tuta.io to have a chance to decrypt the compromised files.

Crooks behind Mailto ransomware ask for a ransom to be paid in Bitcoin or another cryptocurrency, although the exact sum is unknown – it may also vary from victim to victim. Security experts who managed to get hold of the decryption tool from the attackers noted that it was named “Netwalker Decryptor” in the header, so it might be the real name of the ransomware.

Name Mailto ransomware
Also known as Kokoklock ransomware, Koko ransomware, Netwalker ransomware
Type Cryptovirus
Symptoms Files appended with a random extension and unusable; a ransom-demanding note dropped
Encryption algorithm Salsa20
File extension  .[random], full extension example: .mailto[kokoklock@cock.li].1be018
Contact  kokoklock@cock.li,  pabpabtab@tuta.io
Ransom note  [file extension]-Readme.txt 
Termination  Use anti-malware software like Reimage, SpyHunter 5Combo Cleaner or Malwarebytes 
File decryption Only available via backups or third-party recovery software

It is yet unknown how Mailto ransomware is distributed by the threat actors. However, hackers usually use one or a few of the following methods:

  • Exploits;[3]
  • Spam emails;
  • Cracks;
  • Pirated software installers;
  • Fake updates;
  • Unprotected Remote Desktop connections;
  • Malicious ads, etc.

Regardless of how you might have infected your computer with the virus, your main goal should be Mailto ransomware removal. To achieve that, you should employ reputable security software, such as Reimage, although other tools can be used as well. If unsuccessful, you should try entering Safe Mode with Networking and performing a scan from there – check out the instructions below on how to each it.

Note that should first remove Mailto ransomware from your computer before proceeding to file recovery, as all the backups or retrieved files will be repeatedly locked. Currently, there is not an easy way to decrypt the data if no backup is available. Luckily, security experts work on decryption tools that become available to the public, although it is not known how much time it might take to create for this particular Kokoklock ransomware strain.

Another option that might help is third-party recovery software, although chances of recovering all of the data using it are relatively low. We provide the guide below – please check the file recovery section below.

Mailto Kokoklock ransomware
Mailto ransomware is a type of malware that focuses on money extortion by holding user files hostage

Despite all that, you should think twice before you pay cybercriminals for the decryptor – they might simply scam you and never send you the required tool. Cybercriminals behind Mailto ransomware actively try to convince victims that there is no way of recovering data in any other way, but you should not trust people who infected your PC with malware and are holding your files hostage. Here's what they say in the ransom note:

What happen ?

Your files are encrypted, and currently unavailable.
You can check it: all files on your computer has expansion 1be018.
By the way, everything is possible to recover, but you need to follow our instructions.
Otherwise, you cant return your data.

What guarantees?

Its just a business. We absolutely do not care about you and your deals, except getting
benefits. If we do not do our work and liabilities – nobody will not cooperate with us.
Its not in our interests.
To check the ability of returning files, you should write to us by email.
There you can decrypt one file for free. That is our guarantee.

How to contact with us ?

Email us:

1. kokoklock@cock.li
2. pabpabtab@tuta.io

Do not forget that, by paying the ransom, you also prove to them that their nefarious business model works, and it will only encourage the crooks to infect more victims. Unfortunately, some victims might not have another choice but paying to retrieve data that is vital for them.

Ways to avoid the devastating ransomware infection

Do not forget that, by paying the ransom, you also prove to them that their nefarious business model works, and it will only encourage the crooks to infect more victims. Unfortunately, some victims might not have another choice but paying to retrieve data that is vital for them. Unfortunately, ransomware trend among cybercriminals is only increasing, and, although the number of new ransomware strings released is in decline, the new variants of already existing file locking viruses keep emerging every day. The reason for that being is the fact that ransomware is now a lucrative business the attackers benefit from greatly, even if just a small fraction of users actually agree to pay the ransom.

Due to its popularity, ransomware viruses became a real threat to regular users and corporations worldwide. Therefore, you should take precautionary measures in order to make sure either swift recovery or prevention of the infection. Here are some tips from industry experts:

  • Employ comprehensive anti-malware software that would be able to stop the incoming threats;
  • Always update your operating system along with all the installed applications (set the update option to automatic);
  • Avoid visiting high-risk sites, such as porn, torrent, gambling, etc.;
  • Never open an attachment from a spam email that asks you to enable macros;
  • Do not download pirated software or cracks;
  • Use ad-blocker;
  • Use strong passwords for all your accounts;
  • Backup your files on a regular basis.

Mailto ransomware virus
Once Mailto ransomware encrypts all files, victims can no longer access them

Remove Mailto ransomware and do not pay the attackers

To remove Mailto ransomware, you will have to employ anti-malware software that can detect and delete all the malicious files and components of the virus. In some cases, however, the malware might interfere with the software of deleting the infection. In that case, access Safe Mode with Networking as we explained below and then scan your system thoroughly with tools like Reimage or SpyHunter 5Combo Cleaner.

Only once you complete Mailto ransomware removal, you can connect your backup device or the copy the data from the online storage. If you had no backups ready, please check for alternative methods below – they might help you get at least some portion of your data back.

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What to do if failed?
If you failed to remove virus damage using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to remove virus damage. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with SpyHunter 5.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with Combo Cleaner.

To remove Mailto virus, follow these steps:

Remove Mailto using Safe Mode with Networking

To enter Safe Mode with Networking, please follow the following instructions:

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove Mailto

    Log in to your infected account and start the browser. Download Reimage or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete Mailto removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove Mailto using System Restore

You can also use System Restore to terminate the malicious payload of Mailto ransomware:

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of Mailto. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage and make sure that Mailto removal is performed successfully.

Bonus: Recover your data

Guide which is presented above is supposed to help you remove Mailto from your computer. To recover your encrypted files, we recommend using a detailed guide prepared by 2-spyware.com security experts.

If your files are encrypted by Mailto, you can use several methods to restore them:

Use Data Recovery Pro to have a chance of file restoration

Data Recovery software does not work the same way decryptors work, as it retrieves the copy of the locked file from the depths of the hard drive. If that storage space was already overwritten, the data kept there will no longer be possible. Nevertheless, some files might be saved by using Data Recovery Pro.

  • Download Data Recovery Pro;
  • Follow the steps of Data Recovery Setup and install the program on your computer;
  • Launch it and scan your computer for files encrypted by Mailto ransomware;
  • Restore them.

Make use of Windows Previous versions feature

This option is only available if you had System Restore enabled before the infection of the computer. Additionally, only one file can be recovered at the time, so the process might be very time-consuming.

  • Find an encrypted file you need to restore and right-click on it;
  • Select “Properties” and go to “Previous versions” tab;
  • Here, check each of available copies of the file in “Folder versions”. You should select the version you want to recover and click “Restore”.

ShadowExplorer might be employed to recover data locked by Mailto virus

ShadowExplorer can be useful if the malware fails to delete Shadow Volume Copies.

  • Download Shadow Explorer (http://shadowexplorer.com/);
  • Follow a Shadow Explorer Setup Wizard and install this application on your computer;
  • Launch the program and go through the drop down menu on the top left corner to select the disk of your encrypted data. Check what folders are there;
  • Right-click on the folder you want to restore and select “Export”. You can also select where you want it to be stored.

No decryption tool is currently available

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Mailto and other ransomwares, use a reputable anti-spyware, such as Reimage, SpyHunter 5Combo Cleaner or Malwarebytes

About the author

Linas Kiguolis
Linas Kiguolis - Expert in social media

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