Artemon Ransomware – Virus Removal Guide

This post focuses on the notorious ransomware called Artemon. Also included are Removal Steps, potential Recovery of Files that were encrypted by the virus, Computer Protection, as well as Tutorial Video.

Artemon ransomware is a version of AutoHello or Anton malware that currently targets files of the computer users. According to malware researcher that goes by the name of @Amigo-A, Artemon ransomware provided a Bitcoin address so that victims may be able to send the payment for specific decryption software. Note that asking for this recovery tool is not free of charge. It has matching ransom money and the price that victims have to pay is based on the decision of Artemon ransomware managers.

How Artemon virus infects the computer?

The common way to propagate Artemon ransomware is through Trojan Dropper or Downloader, malicious links, pirated copies of commercial software, malicious software bundles, infected websites, bogus software update, and spam emails. Consequently, mass-mailing was known to be the most effective method in the global distribution of Artemon ransomware. Attacker’s can easily send the virus to thousands of email addresses with a single email letter. This mass-mailing campaign can easily reach the inbox of random target and as always, the recipient will never be suspicious of the attached Artemon ransomware file because it is in disguise as legitimate document file type.

Aside from mass-mailing techniques, Artemon ransomware distribute its payload and was able to enter the system with ease using various malware installers like freeware and cracked software. Because there are still many computer users who carelessly downloads and installs free apps and freeware that were modified to eliminate usage restrictions, attackers are taking their chances on these malicious installer files.

Encryption technique by Artemon

As soon as the computer user runs the virus transporter, Artemon ransomware initiates the infection. It starts a communication with the hacker’s command-and-control server and get the public key. Once the key is in place, Artemon ransomware starts encrypting the files using the top-level method. This process will make the encoded files inaccessible and impossible to retrieve. Unlike most ransomware including Cadq, Tortoise, and TRU8, Artemon will never append the file extension. In fact, there are cases that target files were not encrypted at all.

Screenshot of Artemon ransom note

The same thing goes with other variants of this ransomware, actors behind Artemon is going to inform the victims about the file encryption via the ransom note called Artemon.txt. It may also display a lock screen on the computer containing the following message:

The hard disk of your computer have been encrypted with a military grade encryption algorithm. There is no way your data to recover your data without a special key. You can purchase this key on the darknet page shown in step 2. To purchase your key and restore your data, please follow the steps.

Technical Details
Threat NameArtemon Ransomware, Anton, AutoHello
Threat TypeCrypto-virus, File Locker, Encryption Virus
Ransomware Note FileArtemon.txt
Discovered by@Petrovic
Virus AliasAvast : FileRepMalware
Avira : TR/Agent.rkywk
BitDefender : Gen:Heur.Ransom.HiddenTears.1
Comodo : Malware@#2zz9r1q6l1p2s
DrWeb : Trojan.Encoder.33478
Emsisoft : Gen:Heur.Ransom.HiddenTears.1 (B)
eScan : Gen:Heur.Ransom.HiddenTears.1
ESET-NOD32 : MSIL/Filecoder.AFY
F-Secure : Trojan.TR/Agent.rkywk
Gridinsoft : Ransom.Win32.Gen.sa
Kaspersky : HEUR:Trojan.MSIL.Agent.gen
Malwarebytes : Generic.Malware/Suspicious
McAfee : RDN/Ransom
Microsoft : Ransom:MSIL/ArtemonCrypt.PA!MTB
Panda : Trj/GdSda.A
Sophos : Mal/Generic-S
Symantec : ML.Attribute.HighConfidence
Tencent : Msil.Trojan.Agent.Lmaq
TrendMicro : TROJ_GEN.R002H09BF21
Webroot : W32.Trojan.Gen

For complete details including full detection list, hash file, file names, and technical behavior (registry actions, shell commands, and processes) of Artemon ransomware, please refer to this VirusTotal page.

Backup your files

One important step before proceeding with the procedures below is to backup your files. Ransomware are not the same. Each has its unique sets of payloads aside from encrypting the files with complex method. Others tend to delete the infected files after certain period, while others keep them concealed on hidden places. In addition, ransomware decryption tools are not guaranteed to be perfect, there are instances that files suffer from damages during the decryption process.

So, create a backup copy of your entire Artemon encrypted files right now.

Artemon Ransomware Removal Guide

First thing to do is remove the Artemon virus before attempting the decryption. Remember that as long as the ransomware is active, it will repeatedly encrypt the files on the compromised computer.

Infection of Artemon ransom virus is dangerous to the system because it can inject files that runs each time Windows starts. To prevent the malicious files from loading, Windows operating system must run with minimal process and it can be done through SafeMode With Networking.

Stage 1 : Temporarily Disable System Restore on Windows OS

Because Artemon and relevant virus is capable of reinstating itself by exploiting the System Restore of Windows, we suggests that you temporary disable System Restore while executing the steps. This option is also helpful to effectively run a full scan on the computer.

Do not forget to enable back System Restore after completing the removal of Artemon ransomware. This feature is vital in reinstating the operating system to previous normal working condition in case of problems or conflicts occurs.

Stage 2 : Start Windows in Safe Mode With Networking

Windows 10 Guide

1. Click on Windows logo and select Power icon when options pop-ups.
2. Select Restart from the options while pressing Shift key on the keyboard.
3. Choose an Option window will appear, select the Troubleshoot button.
4. On next window, please choose Advanced Option.
5. On Advanced Option window, click on Startup Settings and then, click Restart button to reboot the computer.
6. When Windows boot on Startup Settings, press function key F5 or number 5 on keyboard.

A simpler alternative for Windows 10 users is to scan the computer with Microsoft Defender Offline. This will run a virus scan in the recovery environment.

Windows 8 Guide

1. Click Windows Start icon at the lower left section of the screen.
2. Open Search window and type Advanced in the field. It will open General PC Settings.
3. Click on Advanced Startup and then, click on Restart Now button.
4. Once the computer starts in Advanced Startup option menu, select Troubleshoot.
5. Next, click on Advanced Options to reveal the next section.
6. Click Startup settings and then, click Restart button to boot the PC in Startup Settings.
7. Use function key F5 or number key 5 to Enable Safe Mode with Networking.

Stage 3 : Scan the Computer with Sophos Antivirus

Ransomware files are placed deeply into the system and on various locations, thus, thorough scanning is vital to totally remove Artemon virus. Aside from our suggested tool, you may also run your own security program.

To remove Artemon automatically, scanning the computer with this efficient anti-malware tool is suggested. This scanner does not just uncover known threats like viruses or malware, it is also effective in discovering hazardous ransomware like Artemon.

1. Download Sophos Virus Removal Tool from the link below. Save the file on your computer where you can easily access it.

2. Once the download completes, browse the location of the file. Double-click to run the program and begin the install process.

Screnshot of Sophos Installer

3. On first windows of installation wizard, click Next to continue. Then, it will display the program’s License Agreement. You need to Accept the terms in order to proceed. If Windows prompts for User Account Control, please click Yes to proceed.

Screenshot of Sophos EULA Page

4. On succeeding windows, click Next or Continue to carry on with the installation. After completing the installation process, Launch Sophos Virus Removal Tool.

5. Internet connection is required when running this virus scanner in order to download important updates. Make sure that everything is up-to-date to effectively remove Artemon ransomware and other relevant viruses.

6. Click the Start Scanning button to inspect the computer. This will check the system for presence of malicious objects, malware, and viruses. The tool reveals items that were found linked to Artemon and other suspicious entities. Be sure to remove all identified threats.

Screenshot of Sophos Virus Scan

The above procedures should have totally eliminated Artemon ransomware. However, if you found that there are still remnants of the virus, please proceed to succeeding procedures below.

Stage 4 : Double-check with Microsoft's Malicious Software Removal Tool

1. Download the free scanner called Malicious Software Removal Tool.

Download MSRT

2. The tool automatically checks the operating system and suggest appropriate download version. Click on Download button to begin. Save the file to a convenient location, preferably on Desktop.

3. After downloading the file, Windows will prompt that download has completed. Click Run to start scanning for Artemon ransomware. Another option is to browse the location folder and double click on the file to run.

MSRT Icon

4. The tool will display Welcome screen, click Next. Please note the message "This tool is not a replacement for an antivirus product." You must understand that this program is made specifically to find and remove malware, viruses, Trojans, and other harmful elements on the computer. It was not designed to protect the computer.

MSRT Welcome

5. Next, you will see Scan Type. Please choose Full Scan to ensure that all Artemon ransom virus entities and other harmful files left on the computer will be found and removed. For advanced computer user, you can opt for Customized Scan, if there are other drives or folders you wanted to include in this scan.

MSRT Scan

6. Full scan may take a while, please wait for Malicious Software Removal Tool to complete the tasks. However, you may cancel the scan anytime by clicking on the Cancel button.

MSRT Scan

7. After scanning, the tool will reveal all identified threats. There may be other threats that our first scan fails to detect. Please remove/delete all detected items.

8. When removal procedure is complete, you may now close Malicious Software Removal Tool. We hope that Artemon ransomware have been completely deleted from the computer. Please restart Windows to proceed with the normal operation.

Recover Files from Artemon Ransomware Infection

On this section, we will provide ways to decrypt files infected with Artemon ransomware. Aside from dedicated decryption software and common tools, other options for file recovery are provided. As much as we can, we will update this area whenever there is new and more suitable decryption tool was made available.

Decrypting Artemon infected files with Emsisoft Tools

This service from Emsisoft is helpful in unlocking encrypted files without paying the ransom. It gives three ways to detect the ransomware and provide suitable recovery method:

Upload ransom note – This is usually the .txt or .hta files that was generated by Artemon ransomware.

Upload the encrypted file – The actual encrypted file. Choose the one that is less than 8MB in size.

Contact information – Enter the email address or any links provided as it appears in the ransom note of Artemon virus.

Emsisoft Tools

After submitting any of the appropriate data, Emsisoft will attempt to identify the ransomware and provide keys if there are available.

Option 1: Windows Previous Version Tool

Windows Vista and Windows 7 have a feature called Previous Versions. However, this tool is only usable if restore point was made prior to ransomware infection. To use this tool as "recovery option" for files encypted by Artemon virus, please follow these steps:

1. Open My Computer or Windows Explorer.

2. Right-click on the affected files or folders. From the drop-down list, please click on Restore previous versions.

3. New window will open display all backup copy of files and folders you wanted to recover. Choose the appropriate file and click on Open, Copy, or Restore. Restoring selected files overwrites the current locked files on the computer. The tool is not actually recovering files encrypted by Artemon. Instead, it restores files from backup copy.

Option 2: Use ShadowExplorer to restore files encrypted by Artemon Ransomware

Just like Previous Version tool, ShadowExplorer is taking advantage of shadow copy created by Windows. This tool allows you to retrieve older version of files before it was encrypted by Artemon ransomware.

1. Download ShadowExplorer from the official web site.

2. Install the program with the default settings.

3. The program should run automatically after installation. If not, double-click on ShadowExplorer icon.

4. You can see the drop-down list on top of the console. Please select proper drive and the most recent point-in-time shadow copies of files you wish to restore prior to Artemon ransomware infection.

shadow3

5. Right-click on the Drive, Folder, or File you wish to restore and click Export...

6. Lastly, ShadowExplorer will prompt for location where you want to save the copy of recovered files.

How to protect the computer from Artemon ransomware?

After the removal of the ransomware, it is important to prevent similar incident from happening again. In order to protect the computer effectively, computer user must know how Artemon ransomware was able to infect the computer. To minimize the possible infection, staying away from the common sources of this virus is crucial.

How Artemon ransomware can infect your computer?

The method of infecting the computers was found to be similar as other common viruses. Though, ransomware like Artemon is seen to have efficient deployment via spam email messages, web injectors, malicious software installers, misleading online advertisements, and through another virus infection.

Once the virus is executed, it immediately infects the system. Then, Artemon ransomware communicates to remote server so that unique key can be generated for the specific computer. After acquiring the key, it starts to decrypt target files using a complex method that is almost unbreakable. On the last stage of the attack, Artemon ransomware demands for ransom money as payment for the decryption tool. To further understand the attack scheme, we have included an infographic below.

Infographic image of ransomware attack stages
You can print, download, or share the infographic by clicking the image.

Securing the computer against ransomware attack

Do a Regular File Back-up - Always backup your data on a separate storage devices such as external hard drives, optical discs, or online backup services.

Keep Your Software Updated - Make sure that you have the latest software updates especially on the operating system. Recent updates often contain vital security patches to help protect the computer against all forms of threats.

Install a Security Program - Protect the computer with effective anti-virus application using efficient real-time scanning. Regularly run a complete scan to check the computer for presence of malware.

Protect your files with Controlled Folder Access (Windows 10)

For Windows 10 users, aside from protecting the computer using anti-virus or anti-malware programs, one way to protect against ransomware attack is by using Controlled Folder Access. This feature of Windows Defender Security Center may not prevent the Artemon ransomware infection, but it can protect the folder and files in general. Follow the steps to enable Controlled Folder Access in Windows 10.

1. Go to Windows 10 Taskbar and search for Windows Defender Security Center.

2. Open Windows Defender Security Center and click on Virus & Threat Protection icon.

Virus and Threat Protection

3. On next window, please click on Ransomware Protection.

4. Under Controlled Folder Access section, switch the slider to On. That will enable the feature and protect the folder against Artemon or any type of ransomware.

Controlled Folder Access

5. Click on Protected Folderslink to include additional folders. Make sure that folders where important files are located should be included in the list.

Add Protected Folder

Troubleshooting Guide

Certain programs maybe blocked by Controlled Folder Access feature. To fix the issue, simply have the specific program to be white listed.

1. Under Protected Folders, click Allow an app through controlled folder access.

2. Next, click the Add an allowed app and include the target executable file.

This Controlled Folder Access feature is one way to protect files against Artemon. Other important things to do in keeping files safe against ransomware is through early prevention like keeping programs updated, install an efficient security program, an do regular file backup on a separate media drive.

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