Remove Nomikon Virus (+Decrypt .CNMHR files)

Nomikon Virus Ransomware

The Nomikon stands for a ransomware-type infection. Nomikon was elaborated specifically to encrypt all major file types. When the file is encrypted people are not able to use them. Nomikon adds the “.CNMHR” extension for each file encrypted by it. For example, the file “myphoto.jpg“, as soon as encrypted by Nomikon, will be renamed into “myphoto.jpg.CNMHR“. As soon as the encryption is finished, Nomikon places a special text file into every folder containing the encrypted data.

The message given by Nomikon text file asking for the ransom is definitely the like the statements given by other ransomware virus representatives. It literally points out that the information is encrypted which the only way to restore it is to use a a distinct decryption key. Regretfully, this is definitely true. The sort of cryptography mechanism applied by Nomikon is still not appropriately examined. Still, it is definitely particular that each victim may be given the specific decryption key, which is completely unique. It is impossible to bring back the files without the key available.

Another technique of Nomikon is that the victims cannot access to the key. The key is kept on a particular server run by the frauds associated with Nomikon ransomware. To get the key and recover the important info people have to pay the ransom.

However, irrespective of the asked for amount, people should stay away from paying the virus. Cyber frauds are not fair, so they tend to entirely ignore what their victims feel about the problem, even when the payment reaches their pockets. This is why paying the ransom typically does not give any positive result and people just waste their money for nothing.

We strongly recommend that you do not contact these crooks and definitely do not transfer money into their accounts. It is said to admit that there are no utilities able to crack Nomikon ransomware and to recover the data data for free. Hence, the just best decision is to recover the lost information from the available backup.

Virus Summary

NameNomikon Ransomware
File Extension.CNMHR
Short DescriptionThe ransomware encrypts all the data stored on your system and requires a ransom to be paid on your part supposedly to recover your important files.
SymptomsFile encryption by the ransomware is performed by means of the AES and RSA encryption algorithms. Once the encryption is completed, the ransomware adds its special CNMHR extension to all the files modified by it.
Distribution MethodSpam Emails, Email Attachments
Removal Tool   GridinSoft Anti-Malware

Keep in mind that the internet is now overwhelmed with threats that look comparable to Nomikon ransomware. Malicious programs of such kind are generally elaborated to encrypt important data and to state the demand prior to the user to pay the ransom. The peculiarity of all such ransomware threats is that all apply a comparable algorithm to produce the distinct decryption key for files decryption.

Therefore, as long as the ransomware is still being developed or has some hidden bugs, by hand recovering the information is merely not feasible. The only way to prevent the loss of your crucial files is to routinely create backups of your important information.

Bear in mind that even if you create such backups, they should be put into a special storage utility not connect to your main PC. You may use the USB Flash Drive or external hard drive for this purpose, or refer to the help of the cloud storage. If you store your backup files on your common system they may be encrypted in addition to other files, so it’s definitely not a good storage place.

How did ransomware infect my computer?

There are several methods used by online frauds to distribute Nomikon ransomware. Although it is uncertain how precisely Nomikon injects your system, there are some leaks through which it may infiltrate the system:

  • integration with third-party apps, especially freeware;
  • spam e-mails from unidentified senders;
  • websites rendering free hosting services;
  • pirated peer-to-peer (P2P) downloads.

Typically Nomikon ransomware may exist as some legitimate software, for example, in the pop-ups instructing users to execute some important software updates. This is the common trick used by online scams to persuade people into downloading and installing Nomikon infection manually, by ways of their direct participation in the installation process.

Furthermore, the criminals might describe numerous email spam tactics to inject destructive codes into Windows PC. So, they may refer to to sending unsolicited spam e-mails with tricky notifications promoting users to download the attachments or click on certain download links, for example, the ones encouraging users to open some receipts, files, tax reports or invoices.

Needless to mention, opening such documents or clicking on such dangerous links may seriously damage the system. Fictitious Adobe Flash Player upgrade alerts may result in Nomikon ransom injection. When it comes to the cracked software, these illegally downloaded programs may likewise include malicious codes resulting in Nomikon secret installation. Finally, injection of Nomikon may occur by methods of Trojans that secretly get injected into the system and install malicious utilities without the user’s consent.

Is there any method to avoid the injection of Nomikon ransomware?

Although there is no 100% guarantee to prevent your PC from getting infected, there are some pieces of recommendations we want to share with with you. To start with, be very careful when you surf the web and particularly while downloading free programs. Keep away from opening suspicious email attachments, especially when the sender of the email is not familiar to you.

Remember that some freeware installers may include other unwanted utilities in the bundle, so they may be malicious. Ensure that your current antivirus software and your entire operating system is always duly updated.

Of course, downloading pirated software is unlawful and may result in essential damage to be made for your PC. Thus, stay away from downloading cracked software. You are also highly advised to reconsider your existing security software and potentially change to another security solution that can render far better services of protecting your Windows.

Below please find the quotation from the Nomikon text file:

Your computer has been infected

All your documents, photos, databases and other important files are

To decrypt your files you need to buy our special software -

You can do it right now. Follow the instruction below. But remember that you do not have much time
You have 2 days, 00:24:32
*If you do not pay on time the price will be doubled
*Time ends on February 19, 01:37:43
Current price
0.04089922 BTC
≈400 USD
After time ends
0.08179845 BTC
≈800 USD
How to decrypt files?
You will not be able to decrypt the files yourself. If you try, you will lose your files forever.
To decrypt your files you need to buy our special software -
*If you need guarantees, use trial decryption below.
How to buy UmtxCnMh4r-Decryptor?
Send us an email to:,
In subject line of your message write your personal
ID: umtxcnmh4r-1813464-88f974fb-08d6-4347-8ae1-aaede4cdb8ba-cnmhr
Create a Bitcoin Wallet (we recommend
Buy the necessary amount of Bitcoins. Current price for buying is 0.04089922 BTC
Send 0.04089922 BTC to the address that you receive when
write to us
Wait for 3 confirmations
Download decryptor from the email message
*We guarantee that you can decrypt all your files quickly and safely.
Trial decryption
This file should be an encrypted image. Example
Send us one image for free decryption
*Please note image size must be less than 5Mb.
Buy Bitcoin with Bank
Account or Bank Transfer
Buy Bitcoin with
Credit/Debit Card
Buy Bitcoin with PayPal
Buy Bitcoin with Cash or
Cash Deposit
Current price 0.04089922 btc will be doubled in

Screenshot of files with “.CNMHR” extension added by the ransomware:
Nomikon Ransomware - encrypt files with .CNMHR extension

Use GridinSoft Anti-Malware to remove Nomikon ransomware from your computer

1.Download GridinSoft Anti-Malware.

You can download GridinSoft Anti-Malware by clicking the button below:

  GridinSoft Anti-Malware

2. Double-click on the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-ag.exe file to install GridinSoft Anti-Malware on your computer.
GridinSoft Anti-Malware
An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.
GridinSoft Anti-Malware Setup

3. Press Install button for run GridinSoft Anti-Malware.

GridinSoft Anti-Malware Install

3.Once installed, GridinSoft Anti-Malware will automatically run.

GridinSoft Anti-Malware  Start

4. Wait for the GridinSoft Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your computer for Win Speedup 2018 and other malicious programs. This process can take a 20-30 minutes, so we suggest you periodically check on the status of the scan process.
GridinSoft Anti-Malware Scan

5. Click on “Clean Now”.

When the scan has completed, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.
GridinSoft Anti-Malware Scan Result

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About Daniel Zimmermann

Daniel Zimmermann has been writing on security and malware subjects for many years and has been working in the security industry for over 10 years. Daniel was educated at the Saarland University in Saarbrücken, Germany and currently lives in New York.

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