Avoid data loss caused using Hermes837 ransomware

Also Known As: Hermes837 virus
Distribution: Low
Damage level: Severe

Hermes837 ransomware removal instructions

What is Hermes837?

Hermes837 is a malicious software which is classified as ransomware, the person who discovered is GrujaRS. As a rule, ransomware-type programs are designed to encrypt data (make files inaccessible). Cyber criminals spread programs of this type to extract money from people by forcing them to buy decryption tools or/and keys from them. Hermes837 adds the ".hermes837" extension to the filenames of all encrypted files. For example, it renames "1.jpg" to "1.jpg.hermes837", and so on. Instructions on what to do next are provided in the "!!!READ_ME!!!.txt" file.

To get instructions on how to purchase decryption tool or/and key victims have to contact cyber criminals via hermes837@aol.com. Email must include country and city, ransom note ("!!!READ_ME!!!.txt" text file) and a couple of encrypted files that Hermes837 developers supposed to decrypt for free. These files should be pictures or text files that are no larger than 1 Mb. If attached files will be databases, then cyber criminals will double the price of decryption tool or/and key. One way or another, all further information supposed to be provided after contacting Hermes837 developers. However, we do not recommend to contact or pay these (or any other) cyber criminals: quite often victims who pay them get scammed. In other words, they pay a ransom but do not get anything in return. Unfortunately, most of the times ransomware developers are the only ones who can provide tools that can recover encrypted files. Typically, decryptions without their tools are impossible. Since cyber criminals should not be trusted, we recommend to avoid data and financial loss by restoring all files from a backup.

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

Hermes837 decrypt instructions

There are is a great number of other software of this type out there, for example, Guarded, NextPharma and Meds. Most of them are designed to encrypt data so that ransomware developers could force victims to pay a ransom. Two most common differences are cryptographic algorithm (symmetric or asymmetric) that is used to encrypt data price of a decryption tool and/or key. As a rule, ransomware developers are the only ones who can help victims to decrypt their files, unless a program is not finished (has bugs, flaws, etc). To avoid data loss caused with ransomware we recommend to always have data backed up and keep it on an unplugged storage device or remote server like Cloud.

How did ransomware infect my computer?

It is unknown how cyber criminals proliferate Hermes837 ransomware. Nevertheless, most of the times they use spam campaigns, malicious programs called Trojans, untrustworthy software download sources, fake (unofficial) software updaters and third party activation tools. They use spam campaigns to spread malware through emails that contain malicious attachments. The main goal is to trick recipients into opening one or another attached file. If opened, it installs ransomware or other malicious software. As a rule, they send files such as executable files (like .exe), PDF documents, archive files (like RAR, ZIP), Microsoft Office documents, JavaScript files, and so on. Opening malicious attachments result in computer infections. Trojans are programs that usually are designed to cause chain infections: once installed, they download and install additional malware. Peer-to-Peer networks (like torrent clients, eMule), free file hosting websites, freeware download websites, third party downloaders and other untrustworthy download sources can be used to proliferate malware too. Typically, cyber criminals upload malicious files that are disguised as harmless and hope that someone will download and open them. When opened, they install malicious software. Fake software updaters infect systems either by installing malicious programs instead of updates or by exploiting bugs, flaws of installed software that is out-of-date. Unofficial activation tools infect systems the same way: instead of activating paid software for free, they often install malware.

Threat Summary:
Name Hermes837 virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .hermes837
Ransom Demanding Message !!!READ_ME!!!.txt
Cyber Criminal Contact hermes837@aol.com
Detection Names Avast (Win32:Trojan-gen), BitDefender (Trojan.GenericKD.32439125), ESET-NOD32 (A Variant Of Win32/Filecoder.NXU), Kaspersky (Trojan-Ransom.Win32.Crypmod.actb), 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 Hermes837 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?

We recommend to think twice before opening attachments or links presented in irrelevant emails that are received from suspicious, unknown addresses. Quite often emails of this type are sent by cyber criminals who seek to proliferate one or another malware. Third party downloaders, installers, and other untrustworthy download or installation channels/tools are often used to proliferate malicious programs. The safest way to download programs is to use official websites and direct download links. Installed software should be updated using implemented functions or tools that are provided by the official developers. The same applies to software activation. Besides, third party tools ('cracking' tools) are illegal and can be designed to install malware. And finally, operating systems should be scanned with a reputable anti-virus or anti-spyware software regularly, if they detect any threats, they must be removed immediately. If your computer is already infected with Hermes837, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in Hermes837 ransomware's text file ("!!!READ_ME!!!.txt"):

Whats Happen?
Your files are encrypted, and currently unavailable. You can check it- all files on you computer has extension .hermes
By the way, everything is possible to restore, but you need to follow our instructions. Otherwise, you cant return your data (NEVER).
What guarantees?
It's 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.
It's not in our interests.
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.
In practise - time is much more valuable than money.
What should You include in your message?
1. Your country and city
2. This TXT file
3. Some files for free decryption
Free decryption as guarantee!
Before paying you send us up to 2 files for free decryption.
Send pictures, text files. (files no more than 1mb)
If you upload the database, your price will be doubled

Email: Hermes837@aol.com

ID: -

Screenshot of files encrypted by Hermes837 (".hermes837" extension):

Files encrypted by Hermes837

Hermes837 ransomware removal:

Instant automatic removal of Hermes837 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 Hermes837 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 Hermes837 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 Hermes837 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 Hermes837 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 Hermes837 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 Hermes837, 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 Hermes837 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 Hermes837 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 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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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
Hermes837 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 Hermes837 virus on your mobile device.
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Platform: Windows

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