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Horros Virus – Remove and Restore .horros Files

Horros virus is a new Hidden Tear based malware that is actively infecting computers worldwide. Read our in-depth removal guide in order to learm more about it and recover your computer.

Threat Summary

Name Horros
Type Ransomware
Short Description The Horros virus is a Hidden Tear based malware that encrypts the target data with .horros extension.
Symptoms The victims will find that their files are encrypted with the .horros extension.
Distribution Method Spam Emails, File Sharing Networks, Exploit Kits
Detection Tool See If Your System Has Been Affected by malware


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User Experience Join Our Forum to Discuss Horros.

Horros virus – Infection Spread

The Horros virus can be distributed using various methods depending on the desired scale of attacks. The hackers can make use of the most popular strategies to infect as many targets as possible. As such one of the most popular methods is to send spam messages that include a social engineering element. The preferrred way is to send hyperlinks that lead to the Horros virus samples hosted on a hacker-controlled download page. In other cases the malware operators may attach the files to the messages. The tactics used by the Horros virus controllers are to use stolen text and graphics from well-known sites.

In the last few years we have observed two methods that utilize malware payloads. The first one is to integrate the Horros virus into documents. They can be of different types such as rich text documents, spreadsheets and presentations. Once they are opened by the victims a notification window will be spawned that asks the victims to enable the built-in scripts. When this is done the virus will be automatically loaded into the system and initiated on the victim system. The other strategy is to load the Horros virus code into software installers. The criminals take the legitimate application setup files from official vendors and modify them to include the dangerous code. The reason why this tactic has the potential to impact many users is the fact that the criminals target popular software such as games, utilities, creativity apps and productivity solutions.

Due to the fact that the virus samples can be loaded through a payload or another software browser hijackers are a popular choice. They represent malware browser plugins that are designed to redirect the victim users to a hacker-controlled page, deploy various malware (including the virus) and institute various system changes.

Other Horros virus delivery methods include web scripts such as ads, banners and pop-ups. They can be placed on legitimate sites as well through affiliate networks and other marketing services.

Horros virus – Technical Data

The Horros virus is a newly discovered threat that appears to be a strain of the HiddenTear malware family. The ongoing attack campaigns are being initiated by an unknown individual or criminal collective. Like other similar threats it uses a prescribed behavior pattern that can be modified according to the ongoing attack campaign. This means that the virus can enable or integrate certain features in one campaign and be customized with others in future ones.

The attacks can begin with an information gathering that is programmed to harvest sensitive data from the compromised systems. It can be programmed into hijacking two main types of data:

  • Private Information — This type of data can expose the victim’s identity. The malware engine is programmed into looking our for specific strings: the victims name, address, location, interest, passwords, account credentials and etc.
  • Metrics Data — Other data that can be used by the malware engine for statistical purposes. This includes the available hardware components and certain operating system values.

Once this is done the collected information ca be used to start a stealth protection module. It uses the data to scan for signatures of any applications or services that might interfere with the Horros virus execution. Examples include anti-virus solutions, sandbox environments and virtual machine hosts. Advanced versions can be configured into deleting themselves if they are unable to overcome the security measures.

Follow-up steps include various system changes that all seek to misconfigure the system and allow for further malware actions. A popular method is to modify the Windows Registry by creating new entries or modifying existing ones. When such is the case with system applications or user software the victims apps may loose some functionality or altogether stop working. Overall system performance can be impacted if the malware modifies a system-related value.

Some Hidden Tear based viruses have the ability to institute a network connection to the hacker-controlled server. It can be used to serve various other malware as well. Some connections are used in a manner similar to Trojan viruses by transmitting data in real time. They allow the hackers to spy on the victims and take over control of them at any given time.

The Hidden Tear code is modular enough to allow for additional components to be loaded both before the virus is started and during its execution.

Horros virus — Encryption Process

Once all components have completed execution the ransomware module is started. Following the well-known Hidden Tear behavior patterns it uses a built-in list of target file type extensions that are encrypted with a strong cipher. The captured strains have been found to impact the following data types:

.3dm, .7z, .7zip, .accdb, .ai, .asp, .bmp, .class, .cpp, .cs, .csv, .dat, .db, .dbf,
.doc, .docb, .docm, .docx, .dot, .dotm, .dotx, .dwg, .dxf, .eps, .fla, .gif, .ico, .indd,
.jar, .java, .jpeg, .jpg, .js, .max, .mdb, .msg, .pdb, .pdf, .php, .png, .ps, .psd, .py, .rar,
.raw, .rb, .rtf, .sdf, .sql, .svg, .swf, .tif, .txt, .vcf, .wpd, .wps, .xlm, .xls, .xlsb, .xlsm,
.xlsx, .xlt, .xltm, .xltx, .xml, .zip

All victim files are renamed with the .horros extension. The ransomware engine can also create designated ransom notes with messages that attempt to coerce the victims into paying the hackers a ransom fee.

Remove Horros virus and Restore Your Files

If your computer got compromised and is infected with the Horros ransomware virus, you should have some experience with removing viruses before tampering with it. You should get rid of the ransomware fast before it can spread further on the network and encrypt more files. The recommended action for you is to remove the ransomware completely by following the step-by-step instructions written below.

Martin Beltov

Martin graduated with a degree in Publishing from Sofia University. As a cyber security enthusiast he enjoys writing about the latest threats and mechanisms of intrusion.

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Attention! SensorsTechForum strongly recommends that all malware victims should look for assistance only by reputable sources. Many guides out there claim to offer free recovery and decryption for files encrypted by ransomware viruses. Be advised that some of them may only be after your money.

As a site that has been dedicated to providing free removal instructions for ransomware and malware since 2014, SensorsTechForum’s recommendation is to only pay attention to trustworthy sources.

How to recognize trustworthy sources:

  • Always check "About Us" web page.
  • Profile of the content creator.
  • Make sure that real people are behind the site and not fake names and profiles.
  • Verify Facebook, LinkedIn and Twitter personal profiles.


with Anti-Malware
We recommend you to download SpyHunter and run free scan to remove all virus files on your PC. This saves you hours of time and effort compared to doing the removal yourself.
SpyHunter 5 free remover allows you, subject to a 48-hour waiting period, one remediation and removal for results found. Read EULA and Privacy Policy

Windows Mac OS X

How to Remove Horros from Windows.

Step 1: Boot Your PC In Safe Mode to isolate and remove Horros


Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your PC with SpyHunter

Keep in mind, that SpyHunter’s scanner is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware removal tool to remove the malware threats. Read our SpyHunter 5 review. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria

1. Hold Windows key() + R

2. The "Run" Window will appear. In it, type "msconfig" and click OK.

3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".
Tip: Make sure to reverse those changes by unticking Safe Boot after that, because your system will always boot in Safe Boot from now on.

4. When prompted, click on "Restart" to go into Safe Mode.

5. You can recognise Safe Mode by the words written on the corners of your screen.

Step 2: Uninstall Horros and related software from Windows

Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it. To do that:

1. Hold the Windows Logo Button and "R" on your keyboard. A Pop-up window will appear.

2. In the field type in "appwiz.cpl" and press ENTER.

3. This will open a window with all the programs installed on the PC. Select the program that you want to remove, and press "Uninstall"
Follow the instructions above and you will successfully uninstall most programs.

Step 3: Clean any registries, created by Horros on your computer.

The usually targeted registries of Windows machines are the following:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

You can access them by opening the Windows registry editor and deleting any values, created by Horros there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.

2. When you open it, you can freely navigate to the Run and RunOnce keys, whose locations are shown above.

3. You can remove the value of the virus by right-clicking on it and removing it.
Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.

Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode.
This will enable you to install and use SpyHunter 5 successfully.

Step 4: Scan for Horros with SpyHunter Anti-Malware Tool

1. Click on the "Download" button to proceed to SpyHunter's download page.

It is recommended to run a scan before purchasing the full version of the software to make sure that the current version of the malware can be detected by SpyHunter. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria.

2. After you have installed SpyHunter, wait for it to update automatically.


3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.


4. After SpyHunter has finished scanning your PC for any files of the associated threat and found them, you can try to get them removed automatically and permanently by clicking on the 'Next' button.


If any threats have been removed, it is highly recommended to restart your PC.

Step 5 (Optional): Try to Restore Files Encrypted by Horros.

Ransomware infections and Horros aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the reccomended Data Recovery software by clicking on the link underneath:

Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.

Windows Mac OS X

Get rid of Horros from Mac OS X.

Step 1: Uninstall Horros and remove related files and objects

Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your Mac with SpyHunter for Mac
Keep in mind, that SpyHunter for Mac needs to purchased to remove the malware threats. Click on the corresponding links to check SpyHunter’s EULA and Privacy Policy

1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:

2. Find Activity Monitor and double-click it:

3. In the Activity Monitor look for any suspicious processes, belonging or related to Horros:

Tip: To quit a process completely, choose the “Force Quit” option.

4. Click on the "Go" button again, but this time select Applications. Another way is with the ⇧+⌘+A buttons.

5. In the Applications menu, look for any suspicious app or an app with a name, similar or identical to Horros. If you find it, right-click on the app and select “Move to Trash”.

6: Select Accounts, after which click on the Login Items preference. Your Mac will then show you a list of items that start automatically when you log in. Look for any suspicious apps identical or similar to Horros. Check the app you want to stop from running automatically and then select on the Minus (“-“) icon to hide it.

7: Remove any left-over files that might be related to this threat manually by following the sub-steps below:

  • Go to Finder.
  • In the search bar type the name of the app that you want to remove.
  • Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
  • If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.

In case you cannot remove Horros via Step 1 above:

In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:

Disclaimer! If you are about to tamper with Library files on Mac, be sure to know the name of the virus file, because if you delete the wrong file, it may cause irreversible damage to your MacOS. Continue on your own responsibility!

1: Click on "Go" and Then "Go to Folder" as shown underneath:

2: Type in "/Library/LauchAgents/" and click Ok:

3: Delete all of the virus files that have similar or the same name as Horros. If you believe there is no such file, do not delete anything.

You can repeat the same procedure with the following other Library directories:

→ ~/Library/LaunchAgents

Tip: ~ is there on purpose, because it leads to more LaunchAgents.

Click the button below below to download SpyHunter for Mac and scan for Horros:


SpyHunter for Mac

Step 3 (Optional): Try to Restore Files Encrypted by Horros.

Ransomware infections and Horros aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the reccomended Data Recovery software by clicking on the link underneath:

Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.

Horros FAQ

What is Horros ransomware and how does it work?

Horros is a ransomware infection - the malicious software that enters your computer silently and blocks either access to the computer itself or encrypt your files.

Many ransomware viruses use sophisticated encryption algorithm how to make your files inaccessible. The goal of ransomware infections is to demand that you pay a ransom payment to get access to your files back.

How does Horros ransomware infect my computer?

Via several ways.Horros Ransomware infects computers by being sent via phishing e-mails, containing virus attachment.

This attachment is usually masked as an important document, like an invoice, bank document or even a plane ticket and it looks very convincing to users.

After you download and execute this attachment, a drive-by download occurs and your computer is infected with the ransomware virus.

Another way, you may become a victim of Horros is if you download a fake installer, crack or patch from a low reputation website or if you click on a virus link. Many users report getting a ransomware infection by downloading torrents.

How to open .Horros files?

You can't. At this point the .Horros files are encrypted. You can only open them once they are decrypted.

Decryptor did not decrypt my data. What now?

Do not panic and backup the files. If a decryptor did not decrypt your .Horros files successfully, then do not despair, because this virus is still new.

One way to restore files, encrypted by Horros ransomware is to use a decryptor for it. But since it's a new virus, advised that the decryption keys for it may not be out yet and available to the public. We will update this article and keep you posted as soon as this decryptor is released.

How Do I restore ".Horros" files (Other Methods)?

Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .Horros files.

These methods are in no way 100% guarantee that you will be able to get your files back. But if you have a backup, your chances of success are much greater.

How do I get rid of Horros ransomware virus?

The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti malware software. It will scan for and locate Horros ransomware and then remove it without causing any additional harm to your important .Horros files.

Also, keep in mind that viruses like Horros ransomware also install Trojans and keyloggers that can steal your passwords and accounts. Scanning your computer with an anti-malware software will make sure that all of these virus components are removed and your computer is protected in the future.

What to Do If nothing works?

There is still a lot you can do. If none of the above methods seem to work for you, then try these methods:

  • Try to find a safe computer from where you can can login on your own line accounts like One Drive, iDrive, Google Drive and so on.
  • Try to contact your friends, relatives and other people so that they can check if they have some of your important photos or documents just in case you sent them.
  • Also, check if some of the files that were encrypted it can be re-downloaded from the web.
  • Another clever way to get back some of your files is to find another old computer, a flash drive or even a CD or a DVD where you may have saved your older documents. You might be surprised what will turn up.
  • You can also go to your email account to check if you can send any attachments to other people. Usually what is sent the email is saved on your account and you can re-download it. But most importantly, make sure that this is done from a safe computer and make sure to remove the virus first.

More tips you can find on our forums, where you can also asks any questions about your ransomware problem.

How to Report Ransomware to Authorities?

In case your computer got infected with a ransomware infection, you can report it to the local Police departments. It can help authorities worldwide track and determine the perpetrators behind the virus that has infected your computer. Below, we have prepared a list with government websites, where you can file a report in case you are a victim of a cybercrime:

Cyber-security authorities, responsible for handling ransomware attack reports in different regions all over the world:

Reports may be responded to in different timeframes, depending on your local authorities.

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