Prevent data and monetary loss caused by Erenahen ransomware

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

Erenahen ransomware removal instructions

What is Erenahen?

Erenahen is a malicious software which is categorized as ransomware, it was discovered by GrujaRS. Typically, when computers are encrypted with programs like Erenahen, people cannot access their files because these programs encrypt them with strong encryption algorithms. To be able to access their files victims are forced to pay a ransom. In other words, to buy decryption tools or/and keys from cyber criminals who designed ransomware. Erenahen renames all encrypted files, it adds the ".Erenahen" extension to their filenames. For instance, it renames "1.jpg" to "1.jpg.Erenahen" and so forth.  It also creates a ransom note which is the "How_to_open_files.html" file. It contains instructions on how to pay a ransom.

As stated in the ransom note, it is impossible to recover (restore) files without a unique decryptor. In other words, victims cannot decrypt files encrypted with Erenahen without the right software. To purchase it, victims must contact its developers via or email address. They can send one file which is no larger than 10 Mb too, cyber criminals will decrypt it for free. The email must contain a personal ID that is provided in the "How_to_open_files.html" file. It is stated that attempts to restore files manually will cause permanent data loss. However, it is worth mentioning that cyber criminals cannot be trusted, victims who consider paying them risk to get scammed. There are many cases where cyber criminals did not sent their victims decryption tools or/and keys even after a payment. Unfortunately, most of the times ransomware developers are the only people who can provide tools that can decrypt encrypted files. In order to avoid data loss and being scammed we recommend to restore files from a backup that was (if was) created before installation of ransomware.

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

Erenahen decrypt instructions

Erenahen is just one of the many ransomware-type programs, other examples are b00m, Moka, Kokoklock. Typically, they are designed to prevent victims from accessing their files by encrypting them with strong cryptographic algorithms (symmetric or asymmetric). Once it is done, cyber criminals encourage victims to buy decryption tools or/and keys from them. As a rule, they are the only ones who have them. In other words, there is no other way to decrypt files, unless ransomware is not finished (contains some bugs, flaws, and so on). To avoid data and financial loss caused using ransomware-type programs we recommend to always have data backed up and keep it on a remote server (like Cloud) or/and unplugged storage device.

How did ransomware infect my computer?

In most cases cyber criminals spread malicious programs like the Erenahen ransomware though spam campaigns, Trojans, fake software updaters, various unreliable software download sources and unofficial software activation ('cracking') tools. If they choose to achieve it using spam campaigns, they send emails that contain malicious attachments (or web links that, if clicked, download malicious files). The main goal is to trick recipients into opening attached file which, if opened, installs malware. Sent attachments usually are Microsoft Office of PDF documents, archive files (like RAR, ZIP), executable files (.exe), JavaScript and other files. Trojans are programs that can cause damage only after their installation. If installed, they cause chain infections - download and install additional malware. Fake (unofficial) software updaters usually infect systems when they download and install malicious programs instead of updates exploit bugs, flaws of outdated software as well. Examples of unreliable software download channels are P2P (Peer-to-Peer) networks like eMule, torrent clients, free file hosting websites, freeware (free software) download pages, third party downloaders, unofficial websites, etc. Cyber criminals use these channels to disguise malicious files as legitimate. People who download and open files downloaded from sources of this kind risk to install malicious software by themselves. Software 'cracking' tools supposed to allow their users to bypass paid software activations for free. However, people who use these tools often allow them to install malware.

Threat Summary:
Name Erenahen virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .Erenahen
Ransom Demanding Message How_to_open_files.html
Cyber Criminal Contact,
Detection Names AVG (Win32:Malware-gen), BitDefender (DeepScan:Generic.Ransom.GlobeImposter.53774E16), ESET-NOD32 (A Variant Of Win32/Filecoder.FV), Kaspersky (HEUR:Trojan.Win32.Generic), Full List Of Detections (VirusTotal)
Symptoms Can't open files stored on your computer, previously functional files now have a different extension, for example my.docx.locked. A ransom demanding message is displayed on your desktop. Cyber criminals are asking to pay 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.

To eliminate Erenahen virus our malware researchers recommend scanning your computer with Spyhunter.
▼ Download Spyhunter
Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

How to protect yourself from ransomware infections?

It is important not to open attachments (or web links) that are presented in irrelevant emails that are received from unknown, suspicious addresses. All software and files should be downloaded from official websites, unofficial websites, various third party downloaders, installers and other tools can be used to distribute files that are designed to install malicious programs. Furthermore, software (or operating system) should be updated using implemented functions or tools that are created by the official software developers only. Software 'cracking'/unofficial activation tools often install malware instead of activating installed programs, even if they do, it is not legal to use them. One more way to protect systems from various threats is to regularly scan them with a reputable anti-virus or anti-spyware suite and keep it updated at all times. If your computer is already infected with Erenahen, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in Erenahen ransomware's HTML file ("How_to_open_files.html")

Your files are encrypted!
What happened?
Your files are encrypted, and currently unavailable.
You can check it: all files on you computer has new expansion.
By the way, everything is possible to recover (restore), but you need to buy a unique decryptor.
Otherwise, you never cant return your data.

For purchasing a decryptor contact us by email:
If you will get no answer within 24 hours contact us by our alternate emails:

What guarantees?
Its just a business. If we do not do our work and liabilities - nobody will not cooperate with us.
To verify the possibility of the recovery of your files we can decrypted 1 file for free.
Attach 1 file to the letter (no more than 10Mb). Indicate your personal ID on the letter:
ï Attempts of change files by yourself will result in a loose of data.
ï Our e-mail can be blocked over time. Write now, loss of contact with us will result in a loose of data.
ï Use any third party software for restoring your data or antivirus solutions will result in a loose of data.
ï Decryptors of other users are unique and will not fit your files and use of those will result in a loose of data.
ï If you will not cooperate with our service - for us, its does not matter. But you will lose your time and data, cause just we have the private key.

Screenshot of files encrypted by Erenahen (".Erenahen" extension):

Files encrypted by Erenahen

Erenahen ransomware removal:

Instant automatic removal of Erenahen virus: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of Erenahen virus. Download it by clicking the button below:
▼ DOWNLOAD Spyhunter By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

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 Erenahen 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 Erenahen 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 Erenahen 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 Erenahen 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 Erenahen, 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 Erenahen ransomware.

Note that Windows 10 Fall Creators Update includes "Controlled Folder Access" feature that blocks ransomware attempts to encrypt your files. By default this feature automatically protects files stored in 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's more information on how to get this update and add 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 Erenahen ransomware:

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 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.

Our malware removal guides are free. However, if you want to support us you can send us a donation.

Malware activity

Global virus and spyware activity level today:

Medium threat activity

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

QR Code
Erenahen 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 Erenahen virus on your mobile device.
We Recommend:

Get rid of Erenahen virus today:

▼ REMOVE IT NOW with Spyhunter

Platform: Windows

Editors' Rating for Spyhunter:
Editors ratingOutstanding!

[Back to Top]

Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.