Mailto ransomware removal instructions

Also Known As: Mailto virus
Distribution: Moderate
Damage level: Severe

Mailto ransomware removal instructions

What is Mailto?

Discovered by GrujaRS, Mailto (also known as NetWalker) is malicious software and an updated version of Kokoklock ransomware. Mailto encrypts files, thereby rendering them unusable. The program encrypts data and renames files with the developer's email address and an extension comprising the victim's unique ID (e.g. ".e85fb1"). For example "1.jpg" might be renamed to "1.jpg.mailto[Hamlampampom@cock.li].e85fb1". Once the encryption is complete, Mailto stores a text file in the format "victim's_ID-Readme.txt" (e.g. "E85FB1-Readme.txt") on the desktop.

The message within the text file informs users that their data was encrypted. To restore it, they are urged to contact the cyber criminals responsible for encryption. Victims are encouraged to contact Mailto's developers via the email addresses provided - this will enable them to learn how to decrypt their files and/or pay the ransom. Each victim with files infected by this ransomware receives a unique ID/personal code detailed within the text file. This code must be included in the email response. Additionally, users are permitted to attach one file free of charge for decryption. Generally, only cyber criminals can decrypt data compromised by their software. Mailto and similar programs use strong encryptions that are virtually impossible to 'crack'. Note that cyber criminals can never be trusted - they often provide no decryption software/tools even if paid. If ransom demands are met, victims receive nothing in return and data is lost. The only way to recover encrypted files is from a backup, if one was created prior to encryption.

Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:

Mailto decrypt instructions

Mailto is similar to StuardRitchiCalebSherminator, and many other ransomware-type programs. All encrypt data and demand ransom payments to decrypt files. Differences are cryptographic algorithm used (symmetric or asymmetric) and size of ransom (commonly between three and four digit sums). In most cases, manual decryption (without the involvement of cyber criminals) is impossible unless the ransomware is still in development and/or has flaws/bugs. To ensure data safety, keep backup copies on remote servers and/or unplugged storage devices. As these are also liable to damage, store multiple backups in different locations.

How did ransomware infect my computer?

Ransomware and other malware is proliferated in multiple ways: through trojans, spam campaigns, untrustworthy download channels, software "cracking" (activation) tools and fake updaters. Trojans are malicious programs designed to cause chain infections. They perform rogue download/installation of other malware. Malicious content is also spread through various email attachments (e.g. executable and archive files, Microsoft Office and PDF documents, JavaScript and others). These deceptive emails are sent through large-scale spam campaigns and are often marked as "important" or "official". Untrustworthy download sources also spread malware. These include, Peer-to-Peer sharing networks (e.g. BitTorrent, Gnutella, eMule and etc.), free file hosting websites, third party downloaders and other similar sources. Program "cracking" tools often install malware, rather than activating licensed software. Fake updaters operate in a similar way - rather than updating programs, they exploit bugs/flaws and install malicious content.

Threat Summary:
Name Mailto virus
Threat Type Ransomware, Crypto Virus, Files locker.
Encrypted Files Extension .mailto[Hamlampampom@cock.li] followed by victim's unique ID (e.g., ".mailto[Hamlampampom@cock.li].e85fb1")
Ransom Demanding Message victim's_ID-Readme.txt
Cyber Criminal Contact hamlampampom@cock.li, galgalgalhalk@tutanota.com, sevenoneone@cock.li, kavariusing@tutanota.com
Detection Names Avast (Win32:Trojan-gen), BitDefender (Gen:Variant.Razy.553720), ESET-NOD32 (A Variant Of Win32/Filecoder.NXP), Kaspersky (HEUR:Trojan.Win32.Generic), Full List Of Detections (VirusTotal)
Symptoms Cannot open files stored on your computer, previously functional files now have a different extension (for example, my.docx.locked). A ransom demand message is displayed on your desktop. Cyber criminals demand payment of a ransom (usually in bitcoins) to unlock your files.
Distribution methods Infected email attachments (macros), torrent websites, malicious ads.
Damage All files are encrypted and cannot be opened without paying a ransom. Additional password-stealing trojans and malware infections can be installed together with a ransomware infection.
Malware Removal (Windows)

To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Malwarebytes.
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How to protect yourself from ransomware infections

Attachments included in emails received from suspicious/unknown senders should never be opened. These emails are often disguised as "official", "important", "urgent", or otherwise highlighted as priority mail. In fact, irrelevant emails should not be opened, despite these misleading labels. Download software from official and verified sources only. Avoid unofficial and untrustworthy download websites, Peer-to-Peer sharing networks and other third party downloaders. Software present on the system should be kept up-to-date via functions/tools provided by the official developer. The same extends to software activation. Illegal activation tools ("cracks") might cause system infections. Have a reputable anti-virus/anti-spyware suite installed and updated. These programs can be used to perform regular system scans for detection and elimination of potential threats. If your computer is already infected with Mailto, we recommend running a scan with Malwarebytes for Windows to automatically eliminate this ransomware.

Text presented in Mailto ransomware text file ("victim's_ID-Readme.txt"):

+++++++++++++++++++++++
---
What happen ?
---

Your files are encrypted, and currently unavailable.
You can check it: all files on your computer has expansion e85fb1.
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.Hamlampampom@cock.li
2.Galgalgalhalk@tutanota.com

sevenoneone@cock.li
kavariusing@tutanota.com

kkeessnnkkaa@cock.li
hhaaxxhhaaxx@tuta.io

knoocknoo@cock.li
eeeooppaaaxxx@tuta.io

Be sure to include your personal code in the letter:
-

Screenshot of files encrypted by Mailto (random extension):

Files encrypted by Mailto

Update 6 February 2020 - Developers of Mailto (NetWalker) ransomware have recently started targeting various enterprise networks in order to generate large revenues. Companies are likely to have more valuable files and data than regular users. In addition, these files often contain sensitive data (e.g., customers' personal data, product information [such as patents, ingredients, and similar), information about employees, etc.) Therefore, companies are much more likely to consider paying for decryption, and thus blackmailing becomes easier for the criminals. Furthermore, companies are likely to pay more than say a home user looking to retrieve a music collection, photos, and so on. This type of personal information has limited value and thus criminals are more likely to generate revenue by blackmailing companies rather than home users. Additionally, an updated version of Mailto ransomware has been released, although its behavior is virtually identical. The only differences are email addresses provided and details within the ransom message.

Screenshot of the updated Mailto ransomware message ("random_string-Readme.txt"):

Updated Mailto (NetWalker) ransomware ransom note

Text presented within this file:

Hi!
Your files are encrypted.
All encrypted files for this computer has extension: .f5be7

--

If for some reason you read this text before the encryption ended,
this can be understood by the fact that the computer slows down,
and your heart rate has increased due to the ability to turn it off,
then we recommend that you move away from the computer and accept that you have been compromised,
rebooting/shutdown will cause you to lose files without the possibility of recovery and even god will not be able to help you,
it could be files on the network belonging to other users, sure you want to take that responsibility?

--

Our encryption algorithms are very strong and your files are very well protected, you can't hope to recover them without our help.
The only way to get your files back is to cooperate with us and get the decrypter program.
Do not try to recover your files without a decrypt program, you may damage them and then they will be impossible to recover.

We advise you to contact us as soon as possible, otherwise there is a possibility that your files will never be returned.
For us this is just business and to prove to you our seriousness, we will decrypt you some files for free,
but we will not wait for your letter for a long time, mail can be abused, we are moving on, hurry up with the decision.

Сontact us:
1.sevenoneone@cock.li
2.kavariusing@tutanota.com

Don't forget to include your code in the email:
-

Screenshot of files encrypted by the updated Mailto ransomware (random extension remains):

Files compromised by the updated Mailto (NetWalker) ransomware

Screenshot of the updated Mailto ransomware process (disguised as "Sticky Password") in Windows Task Manager:

Process of the updated Mailto (NetWalker) ransomware

Update 12 March 2020 - Criminals have released yet another variant of Mailto (NetWalker) ransomware. The filenames are now appended with a random extension and the ransom message ("[[random_string]-Readme.txt") is also slightly different.

Screenshot of updated Mailto (NetWalker) ransomware ransom message:

Mailto (NetWalker) ransomware ransom note

Text presented within this file:

Hi!
Your files are encrypted.
All encrypted files for this computer has extension: .8fec81

--
If for some reason you read this text before the encryption ended,
this can be understood by the fact that the computer slows down,
and your heart rate has increased due to the ability to turn it off,
then we recommend that you move away from the computer and accept that you have been compromised.
Rebooting/shutdown will cause you to lose files without the possibility of recovery.

--
Our  encryption algorithms are very strong and your files are very well protected,
the only way to get your files back is to cooperate with us and get the decrypter program.

Do not try to recover your files without a decrypter program, you may damage them and then they will be impossible to recover.

For us this is just business and to prove to you our seriousness, we will decrypt you one file for free.
Just open our website, upload the encrypted file and get the decrypted file for free.

--

Steps to get access on our website:
1.Download and install tor-browser: hxxps://torproject.org/
2.Open our website: rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion
3.Put your personal code in the input form:
-

Screenshot of files encrypted by this ransomware (random extension):

Mailto (NetWalker) ransomware encrypted files

Appearance of the updated Mailto (NetWalker) ransomware Tor website (GIF):

Mailto (NetWalker) ransomware Tor website

Text presented within this site:

"Payment" tab:

 

Your files are encrypted.
Only way to decrypt your files, is buy the decrypter program.
Your user key: 30CAB775, write it down and use it to log in again.
Invoice for payment
You have left 9 days 23 hours 59 minutes 36 seconds
Status: Waiting for payment
You can buy the decrypter program for your computer(s).
The amount before the increase is 2000$ (0.21740000 BTC).
If there is no payment before 22.03.20 [05:01], the price will increase by x2 times and will be 4000$ (0.43480000 BTC)
Decrypter for: COMPUTER(S): code_8fec81
-
Amount for payment: 0.21740000 BTC
You payed: 0.00000000 BTC

 


"Free decrypt" tab:


For test we can upload and decrypt 3 images or document files free
File must be less than 3 megabyte.
Allow formats: .jpg, jpeg, .png, .bmp, .doc, .docx

Choose a file or drag it here

 

 

"FAQ" tab:

 

1. Where to buy bitcoin?
    1) The fastest and most reliable way is to use the help of Cyber Security IT company, they will be able to solve all questions for you.
    2) Buy bitcoins with cash, use google to search for sellers.
         You will need a bitcoin wallet, we recommend using it: hxxps://login.blockchain.com/#/signup
    3) The slowest way is to buy bitcoin on the exchange. The exchange requires verification, this process may take several days.
         List of exchanges:
           1) hxxps://localbitcoins.com
           2) hxxps://blockchain.com
           3) hxxps://www.coindesk.com
           4) Other exchange.

2. How long after payment will I be able to get the decrypter program?
    You will be able to download the decrypter program as soon as Your transaction has more 3 of confirmations.
    This usually takes between 30 minutes and 3 hours.
    (Depending on the size of the commission. Never specify a zero сommission, use an average/high сommission.)

3. I sent a message to the chat, how long to wait for a response?
    The average response time to messages is 2 hours.
    The maximum response time is 12 hours.

4. How can I make sure that you can decrypt my files?
    When you log in, your user code or user key is checked and your keys are searched.
    If you are logged in, your keys are found.
    To make sure, you can decrypt 3 of photos (images) and document files for free in the "free decrypt" section

5. How can I make sure That you will give me the decrypter program after payment?
    It's just business. We value our name, so after payment you are guaranteed to get the decrypter program.

6. How long does it take to decrypt files?
   Decryption of files is a very fast process, it all depends on the number of encrypted files, as well as their location HDD/Network.

7. What if I can 't decrypt my files after receiving the decrypter program?
    This is excluded, Your files will be 100% decrypted.
    After payment, you will receive instructions for decryption along with the decrypter program.
    We will answer any questions about decrypting files in the chat.
    Along with the decrypt program, you get technical support.

Update 23 March 2020 - Cyber criminals have recently started a Coronavirus-related email spam campaign to spread Mailto (NetWalker) ransomware.

Update 27 March 2020 - A week ago, cyber criminals started an affiliate campaign to provide Mailto (NetWalker) as Ransomware as a Service (RaaS). Therefore, anyone can cooperate with the ransomware developers to earn revenue. Cyber criminals provide all of the necessary infection tools, while the affiliate must take care of spreading the ransomware. It is currently unconfirmed whether developers ask for a subscription/one-time payment or a percentage of the profit that the affiliate makes. The RaaS is promoted on various hacker forums.

Example of a forum post used to promote Mailto (NetWalker) as RaaS (the original text is in Russian and the example is translated):

Mailto (NetWalker) ransomware promoted as Ransomware as a Service (RaaS)

Update May 15, 2020 - The developers of NetWalker ransomware have recently started leaking data stolen from their victims. The data is available in their website blog and only those victims who have not agreed to pay ransoms get their data leaked. Moreover, developers mostly leak information stolen from various companies, businesses, etc., because they have way more resources than a regular home user and thus may eventually agree to pay in exchange for data deletion and removal from the website.

Screenshot of NetWalker ransomware's data leaking blog:

NetWalker ransomware developers data leaking website

Mailto ransomware removal:

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Malwarebytes is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
▼ DOWNLOAD Malwarebytes By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Malwarebytes. 14 days free trial available.

Quick menu:

Step 1

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

Step 2

Log in to the account infected with the Mailto virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the Mailto ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining Mailto ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of Mailto are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by Mailto, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as Mailto ransomware.

Note that Windows 10 Fall Creators Update includes a "Controlled Folder Access" feature that blocks ransomware attempts to encrypt your files. By default, this feature automatically protects files stored in the Documents, Pictures, Videos, Music, Favorites as well as Desktop folders.

Controll Folder Access

Windows 10 users should install this update to protect their data from ransomware attacks. Here is more information on how to get this update and add an additional protection layer from ransomware infections.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove Mailto ransomware:

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About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Removal Instructions in other languages
Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
Mailto virus QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of Mailto virus on your mobile device.
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