Avoid data loss caused by Hermes837 ransomware

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

Hermes837 ransomware removal instructions

What is Hermes837?

Discovered by GrujaRS, Hermes837 is malicious software classified as ransomware. Ransomware-type programs are designed to encrypt data, thereby rendering files inaccessible. Cyber criminals spread programs of this type to extort money from people by forcing them to purchase decryption tools and/or keys. Hermes837 adds the ".hermes837" extension to the filenames of all encrypted files. For example, "1.jpg" becomes "1.jpg.hermes837". Instructions about what to do next are provided in the "!!!READ_ME!!!.txt" file.

To get instructions about how to purchase decryption tool/key, victims are encouraged to contact cyber criminals via hermes837@aol.com. The email must include the country and city, ransom message (within the "!!!READ_ME!!!.txt" text file), and a number of encrypted files that Hermes837 developers will supposedly decrypt free of charge. These files should be images or text files no larger than 1 MB. If attached files are databases (i.e., of value), cyber criminals will double the cost of decryption tool and/or key. All further information is supposedly provided after contacting Hermes837 developers, however, we advise against contacting or paying these (or other) cyber criminals. Victims who pay are scammed. I.e., victims pay the ransom but receive nothing in return. Unfortunately, only ransomware developers have tools that can recover encrypted files. Typically, decryptions without their tools are impossible. Despite this, cyber criminals can never be trusted. Therefore, we recommend that, to avoid data and financial loss, you restore all files from a backup if one has been created prior to infection.

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

Hermes837 decrypt instructions

There are many programs of this type online, including, for example, Guarded, NextPharma, and Meds. Most encrypt data so that ransomware developers can force victims to pay ransoms. Common differences are cryptographic algorithm (symmetric or asymmetric) used to encrypt data and cost of a decryption tool and/or key. Generally, only ransomware developers are able to decrypt files, unless the program is not finished (has bugs, flaws, etc). To avoid data loss caused with ransomware, have your data backed up and keep it on an unplugged storage device or remote server such as Cloud.

How did ransomware infect my computer?

It is unknown exactly how cyber criminals proliferate Hermes837 ransomware, however, they generally 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 proliferate malware through emails that contain malicious attachments. The main aim is to trick recipients into opening the attached file, which then installs ransomware or other malicious software. They send files such as executable files (.exe), PDF documents, archive files (RAR, ZIP), Microsoft Office documents, JavaScript files, and so on. Opening malicious attachments results in computer infections. Trojans are programs that usually cause chain infections: once installed, they download and install additional malware. Peer-to-Peer networks (torrent clients, eMule), free file hosting websites, freeware download websites, third party downloaders and other untrustworthy download sources can be used to proliferate malware. 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 by installing malicious programs rather than updates, or by exploiting bugs/flaws of installed software that is out-of-date. Unofficial activation tools infect systems in the same way: rather than activating paid software free of charge, they 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 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.

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

Think twice before opening attachments or links presented in irrelevant emails received from suspicious, unknown addresses. These emails are often sent by cyber criminals who seek to proliferate 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 using official websites and direct download links. Installed software should be updated using implemented functions or tools provided by the official developers. The same applies to software activation. Third party tools ('cracking' tools) are illegal and can be designed to install malware. Finally, operating systems should be scanned with reputable anti-virus or anti-spyware software regularly. If any threats are detected, remove them 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 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 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 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.

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

Malware activity

Global malware 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.
We Recommend:

Get rid of Hermes837 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.