MEDUSA (.MEDUSA) ransomware virus - removal and decryption options

Also Known As: MEDUSA virus
Damage level: Severe

What kind of malware is MEDUSA?

MEDUSA is ransomware that encrypts data, appends the ".MEDUSA" extension to filenames, and drops the "!!!READ_ME_MEDUSA!!!.txt" file, which contains a ransom note. Our team discovered MEDUSA while examining samples submitted to VirusTotal.

An example of how MEDUSA modifies filenames: it renames "1.jpg" to "1.jpg.MEDUSA", "2.png" to "2.png.MEDUSA", and so forth.

Screenshot of files encrypted by this ransomware:

Files encrypted by MEDUSA ransomware (.MEDUSA extension)

MEDUSA ransom note overview

The ransom note says that the network has been breached and data has been copied. The attackers claim to have penetrated the entire network, including the backup system, and accessed all of the data. They state that they have extracted all of the valuable data and copied it to a private cloud storage.

According to the ransom note, the attackers have encrypted all of the files on the network using a military-grade encryption algorithm. The victim cannot decrypt the files without their help. The attackers offer to decrypt the files if the victim contacts them through live chat and pays for the decryption tool and keys.

The ransom note also warns that if the victim does not pay the ransom within three days, all data will be made public. It provides instructions on how to contact cybercriminals through their live chat, Tox Chat Program, and support email (medusa.serviceteam@protonmail.com).

More details about ransomware

In most cases, cybercriminals who launch ransomware attacks are the only ones who possess decryption tools. Unfortunately, not all victims who pay the demanded ransom receive the promised decryption tools. Therefore, it is strongly advised not to pay a ransom.

Victims can restore files without the interference of threat actors when they have a data backup, or a third-party decryption tool is available online.

Ransomware is malicious software that can cause further damage by encrypting additional files. Also, it can spread to other devices on the local network while it is active. Thus, it is important to remove ransomware as soon as possible to prevent further harm.

Ransomware in general

Ransomware is a type of malware that encrypts files, making them inaccessible to the victim. Threat actors use ransomware attacks to extort money from victims, by demanding payment in exchange for decryption tools. The cost of the decryption tool and the encryption algorithm used to encrypt the files are among the most common differences between ransomware attacks.

Examples of different ransomware variants are Tils, SHTORM, and Saw.

How did ransomware infect my computer?

Ransomware infections are typically caused by downloading and executing files or clicking on links sent to them by threat actors via email or by downloading files from untrustworthy sources such as P2P networks, third-party downloaders, free file hosting pages, websites hosting pirated software, or cracking tools.

Cybercriminals also use fake installers, fake software updating tools, and Trojans to distribute ransomware and rely on users executing ransomware or malware that is used to distribute ransomware themselves.

Malicious MS Office, PDF documents, archives, or ISO files containing malicious files, executables, or JavaScript files (among other file types) are commonly used by cybercriminals to lure users into infecting their computers with ransomware.

Threat Summary:
Name MEDUSA virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .MEDUSA
Ransom Demanding Message !!!READ_ME_MEDUSA!!!.txt
Free Decryptor Available? No
Cyber Criminal Contact medusa.serviceteam@protonmail.com, medusa.support@onionmail.org
Detection Names Avast (Win32:RansomX-gen [Ransom]), Combo Cleaner (Gen:Heur.Ransom.REntS.Gen.1), ESET-NOD32 (A Variant Of Win32/Filecoder.Medusa.A), Ikarus (Win32.Outbreak), Microsoft (Ransom:Win32/MedusaLocker.PA!MTB), 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.
Malware Removal (Windows)

To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Combo Cleaner.
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To use full-featured product, you have to purchase a license for Combo Cleaner. 7 days free trial available. Combo Cleaner is owned and operated by Rcs Lt, the parent company of PCRisk.com read more.

How to protect yourself from ransomware infections?

Double-check any suspicious emails, especially those sent from unknown addresses, and be wary of attachments or links they contain. Download software only from official pages and stores, and avoid opening downloads from shady pages, third-party downloaders, P2P networks, or clicking suspicious links.

Do not trust advertisements on dubious pages, and ensure that your operating system and installed programs are up-to-date. Regularly scanning your computer for threats and using reputable antivirus software can also help prevent and detect ransomware infections.

If your computer is already infected with MEDUSA, we recommend running a scan with Combo Cleaner Antivirus for Windows to automatically eliminate this ransomware.

The appearance of MEDUSA's "!!!READ_ME_MEDUSA!!!.txt" file (GIF):

MEDUSA ransomware ransom note (!!!READ_ME_MEDUSA!!!.txt)

Text in the ransom note:

$$\      $$\ $$$$$$$$\ $$$$$$$\  $$\   $$\  $$$$$$\   $$$$$$\  
$$$\    $$$ |$$  _____|$$  __$$\ $$ |  $$ |$$  __$$\ $$  __$$\
$$$$\  $$$$ |$$ |      $$ |  $$ |$$ |  $$ |$$ /  \__|$$ /  $$ |
$$\$$\$$ $$ |$$$$$\    $$ |  $$ |$$ |  $$ |\$$$$$$\  $$$$$$$$ |
$$ \$$$  $$ |$$  __|   $$ |  $$ |$$ |  $$ | \____$$\ $$  __$$ |
$$ |\$  /$$ |$$ |      $$ |  $$ |$$ |  $$ |$$\   $$ |$$ |  $$ |
$$ | \_/ $$ |$$$$$$$$\ $$$$$$$  |\$$$$$$  |\$$$$$$  |$$ |  $$ |
\__|     \__|\________|\_______/  \______/  \______/ \__|  \__|
-----------------------------[ Hello, ********  !!! ]--------------------------

1. We have PENETRATE your network and COPIED data.
* We have penetrated entire network including backup system and researched all about your data.
* And we have extracted all of your important and valuable data and copied them to private cloud storage.

2. We have ENCRYPTED your files.
While you are reading this message, it means all of your files and data has been ENCRYPTED by world's strongest ransomware.
All files have encrypted with new military-grade encryption algorithm and you can not decrypt your files.
But don't worry, we can decrypt your files.

There is only one possible way to get back your computers and servers - CONTACT us via LIVE CHAT and pay for the special
This MEDUSA DECRYPTOR will restore your entire network, This will take less than 1 business day.

We can post your data to the public and send emails to your customers.
We have professional OSINTs and media team for leak data to telegram, facebook, twitter channels and top news websites.

You can suffer significant problems due disastrous consequences, leading to loss of valuable intellectual property and other sensitive information,
 costly incident response efforts, information misuse/abuse, loss of customer trust, brand and reputational damage, legal and regulatory issues.


After paying for the data breach and decryption, we guarantee that your data will never be leaked and this is also for our reputation.

YOU should be AWARE!
We will speak only with an authorized person. It can be the CEO, top management, etc.
In case you ar not such a person - DON'T CONTACT US! Your decisions and action can result in serious harm to your company!
Inform your supervisors and stay calm!

If you do not contact us within 3 days, We will start publish your case to our official blog and everybody will start notice your incident!
--------------------[ Official blog tor address ]--------------------
Using TOR Browser(hxxps://www.torproject.org/download/):


----------------------[ Your company live chat address ]---------------------------
Using TOR Browser(hxxps://www.torproject.org/download/):


Or Use Tox Chat Program(hxxps://qtox.github.io/)
Add user with our tox ID : 4AE245548F2A225882951FB14E9BF87E E01A0C10AE159B99D1EA62620D91A372205227254A9F

Our support email: ( medusa.serviceteam@protonmail.com )

Company identification hash:

Screenshot of MEDUSA ransomware's data leaking site:

MEDUSA ransomware data leaking site

MEDUSA ransomware removal:

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced IT skills. Combo Cleaner is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
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Video suggesting what steps should be taken in case of a ransomware infection:

Quick menu:

Reporting ransomware to authorities:

If you are a victim of a ransomware attack we recommend reporting this incident to authorities. By providing information to law enforcement agencies you will help track cybercrime and potentially assist in the prosecution of the attackers. Here's a list of authorities where you should report a ransomware attack. For the complete list of local cybersecurity centers and information on why you should report ransomware attacks, read this article.

List of local authorities where ransomware attacks should be reported (choose one depending on your residence address):

Isolating the infected device:

Some ransomware-type infections are designed to encrypt files within external storage devices, infect them, and even spread throughout the entire local network. For this reason, it is very important to isolate the infected device (computer) as soon as possible.

Step 1: Disconnect from the internet.

The easiest way to disconnect a computer from the internet is to unplug the Ethernet cable from the motherboard, however, some devices are connected via a wireless network and for some users (especially those who are not particularly tech-savvy), disconnecting cables may seem troublesome. Therefore, you can also disconnect the system manually via Control Panel:

Navigate to the "Control Panel", click the search bar in the upper-right corner of the screen, enter "Network and Sharing Center" and select search result: Disconnecting computer from the Internet (step 1)

Click the "Change adapter settings" option in the upper-left corner of the window: Disconnecting computer from the Internet (step 2)

Right-click on each connection point and select "Disable". Once disabled, the system will no longer be connected to the internet. To re-enable the connection points, simply right-click again and select "Enable". Disconnecting computer from the Internet (step 3)

Step 2: Unplug all storage devices.

As mentioned above, ransomware might encrypt data and infiltrate all storage devices that are connected to the computer. For this reason, all external storage devices (flash drives, portable hard drives, etc.) should be disconnected immediately, however, we strongly advise you to eject each device before disconnecting to prevent data corruption:

Navigate to "My Computer", right-click on each connected device, and select "Eject": Ejecting external storage devices

Step 3: Log-out of cloud storage accounts.

Some ransomware-type might be able to hijack software that handles data stored within "the Cloud". Therefore, the data could be corrupted/encrypted. For this reason, you should log-out of all cloud storage accounts within browsers and other related software. You should also consider temporarily uninstalling the cloud-management software until the infection is completely removed.

Identify the ransomware infection:

To properly handle an infection, one must first identify it. Some ransomware infections use ransom-demand messages as an introduction (see the WALDO ransomware text file below).

Identify ransomware-type infection (step 1)

This, however, is rare. In most cases, ransomware infections deliver more direct messages simply stating that data is encrypted and that victims must pay some sort of ransom. Note that ransomware-type infections typically generate messages with different file names (for example, "_readme.txt", "READ-ME.txt", "DECRYPTION_INSTRUCTIONS.txt", "DECRYPT_FILES.html", etc.). Therefore, using the name of a ransom message may seem like a good way to identify the infection. The problem is that most of these names are generic and some infections use the same names, even though the delivered messages are different and the infections themselves are unrelated. Therefore, using the message filename alone can be ineffective and even lead to permanent data loss (for example, by attempting to decrypt data using tools designed for different ransomware infections, users are likely to end up permanently damaging files and decryption will no longer be possible even with the correct tool).

Another way to identify a ransomware infection is to check the file extension, which is appended to each encrypted file. Ransomware infections are often named by the extensions they append (see files encrypted by Qewe ransomware below).

Identify ransomware-type infection (step 2)

This method is only effective, however, when the appended extension is unique - many ransomware infections append a generic extension (for example, ".encrypted", ".enc", ".crypted", ".locked", etc.). In these cases, identifying ransomware by its appended extension becomes impossible.

One of the easiest and quickest ways to identify a ransomware infection is to use the ID Ransomware website. This service supports most existing ransomware infections. Victims simply upload a ransom message and/or one encrypted file (we advise you to upload both if possible).

Identify ransomware-type infection (step 3)

The ransomware will be identified within seconds and you will be provided with various details, such as the name of the malware family to which the infection belongs, whether it is decryptable, and so on.

Example 1 (Qewe [Stop/Djvu] ransomware):

Identify ransomware-type infection (step 4)

Example 2 (.iso [Phobos] ransomware):

Identify ransomware-type infection (step 5)

If your data happens to be encrypted by ransomware that is not supported by ID Ransomware, you can always try searching the internet by using certain keywords (for example, a ransom message title, file extension, provided contact emails, crypto wallet addresses, etc.).

Search for ransomware decryption tools:

Encryption algorithms used by most ransomware-type infections are extremely sophisticated and, if the encryption is performed properly, only the developer is capable of restoring data. This is because decryption requires a specific key, which is generated during the encryption. Restoring data without the key is impossible. In most cases, cybercriminals store keys on a remote server, rather than using the infected machine as a host. Dharma (CrySis), Phobos, and other families of high-end ransomware infections are virtually flawless, and thus restoring data encrypted without the developers' involvement is simply impossible. Despite this, there are dozens of ransomware-type infections that are poorly developed and contain a number of flaws (for example, the use of identical encryption/decryption keys for each victim, keys stored locally, etc.). Therefore, always check for available decryption tools for any ransomware that infiltrates your computer.

Finding the correct decryption tool on the internet can be very frustrating. For this reason, we recommend that you use the No More Ransom Project and this is where identifying the ransomware infection is useful. The No More Ransom Project website contains a "Decryption Tools" section with a search bar. Enter the name of the identified ransomware, and all available decryptors (if there are any) will be listed.

Searching for ransomware decryption tools in nomoreransom.org website

Restore files with data recovery tools:

Depending on the situation (quality of ransomware infection, type of encryption algorithm used, etc.), restoring data with certain third-party tools might be possible. Therefore, we advise you to use the Recuva tool developed by CCleaner. This tool supports over a thousand data types (graphics, video, audio, documents, etc.) and it is very intuitive (little knowledge is necessary to recover data). In addition, the recovery feature is completely free.

Step 1: Perform a scan.

Run the Recuva application and follow the wizard. You will be prompted with several windows allowing you to choose what file types to look for, which locations should be scanned, etc. All you need to do is select the options you're looking for and start the scan. We advise you to enable the "Deep Scan" before starting, otherwise, the application's scanning capabilities will be restricted.

Recuva data recovery tool wizard

Wait for Recuva to complete the scan. The scanning duration depends on the volume of files (both in quantity and size) that you are scanning (for example, several hundred gigabytes could take over an hour to scan). Therefore, be patient during the scanning process. We also advise against modifying or deleting existing files, since this might interfere with the scan. If you add additional data (for example, downloading files/content) while scanning, this will prolong the process:

Recuva data recovery tool scan time

Step 2: Recover data.

Once the process is complete, select the folders/files you wish to restore and simply click "Recover". Note that some free space on your storage drive is necessary to restore data:

Recuva data recovery tool recovering data

Create data backups:

Proper file management and creating backups is essential for data security. Therefore, always be very careful and think ahead.

Partition management: We recommend that you store your data in multiple partitions and avoid storing important files within the partition that contains the entire operating system. If you fall into a situation whereby you cannot boot the system and are forced to format the disk on which the operating system is installed (in most cases, this is where malware infections hide), you will lose all data stored within that drive. This is the advantage of having multiple partitions: if you have the entire storage device assigned to a single partition, you will be forced to delete everything, however, creating multiple partitions and allocating the data properly allows you to prevent such problems. You can easily format a single partition without affecting the others - therefore, one will be cleaned and the others will remain untouched, and your data will be saved. Managing partitions is quite simple and you can find all the necessary information on Microsoft's documentation web page.

Data backups: One of the most reliable backup methods is to use an external storage device and keep it unplugged. Copy your data to an external hard drive, flash (thumb) drive, SSD, HDD, or any other storage device, unplug it and store it in a dry place away from the sun and extreme temperatures. This method is, however, quite inefficient, since data backups and updates need to be made regularly. You can also use a cloud service or remote server. Here, an internet connection is required and there is always the chance of a security breach, although it's a really rare occasion.

We recommend using Microsoft OneDrive for backing up your files. OneDrive lets you store your personal files and data in the cloud, sync files across computers and mobile devices, allowing you to access and edit your files from all of your Windows devices. OneDrive lets you save, share and preview files, access download history, move, delete, and rename files, as well as create new folders, and much more.

You can back up your most important folders and files on your PC (your Desktop, Documents, and Pictures folders). Some of OneDrive’s more notable features include file versioning, which keeps older versions of files for up to 30 days. OneDrive features a recycling bin in which all of your deleted files are stored for a limited time. Deleted files are not counted as part of the user’s allocation.

The service is built using HTML5 technologies and allows you to upload files up to 300 MB via drag and drop into the web browser or up to 10 GB via the OneDrive desktop application. With OneDrive, you can download entire folders as a single ZIP file with up to 10,000 files, although it can’t exceed 15 GB per single download.

OneDrive comes with 5 GB of free storage out of the box, with an additional 100 GB, 1 TB, and 6 TB storage options available for a subscription-based fee. You can get one of these storage plans by either purchasing additional storage separately or with Office 365 subscription.

Creating a data backup:

The backup process is the same for all file types and folders. Here’s how you can back up your files using Microsoft OneDrive

Step 1: Choose the files/folders you want to backup.

Click the OneDrive icon in the taskbar

Click the OneDrive cloud icon to open the OneDrive menu. While in this menu, you can customize your file backup settings.

Select Help & Settings and click Settings

Click Help & Settings and then select Settings from the drop-down menu.

Select the Backup tab and click Manage backup

Go to the Backup tab and click Manage backup.

Select folders to backup and click Start backup

In this menu, you can choose to backup the Desktop and all of the files on it, and Documents and Pictures folders, again, with all of the files in them. Click Start backup.

Now, when you add a file or folder in the Desktop and Documents and Pictures folders, they will be automatically backed up on OneDrive.

To add folders and files, not in the locations shown above, you have to add them manually.

Select a file manually and copy it

Open File Explorer and navigate to the location of the folder/file you want to backup. Select the item, right-click it, and click Copy.

Paste the copied file in the OneDrive folder to create a backup

Then, navigate to OneDrive, right-click anywhere in the window and click Paste. Alternatively, you can just drag and drop a file into OneDrive. OneDrive will automatically create a backup of the folder/file.

File statuses in OneDrive folder

All of the files added to the OneDrive folder are backed up in the cloud automatically. The green circle with the checkmark in it indicates that the file is available both locally and on OneDrive and that the file version is the same on both. The blue cloud icon indicates that the file has not been synced and is available only on OneDrive. The sync icon indicates that the file is currently syncing.

Click Help & Settings and click View Online

To access files only located on OneDrive online, go to the Help & Settings drop-down menu and select View online.

Click the Settings cog and click Options

Step 2: Restore corrupted files.

OneDrive makes sure that the files stay in sync, so the version of the file on the computer is the same version on the cloud. However, if ransomware has encrypted your files, you can take advantage of OneDrive’s Version history feature that will allow you to restore the file versions prior to encryption.

Microsoft 365 has a ransomware detection feature that notifies you when your OneDrive files have been attacked and guide you through the process of restoring your files. It must be noted, however, that if you don’t have a paid Microsoft 365 subscription, you only get one detection and file recovery for free.

If your OneDrive files get deleted, corrupted, or infected by malware, you can restore your entire OneDrive to a previous state. Here’s how you can restore your entire OneDrive:


1. If you're signed in with a personal account, click the Settings cog at the top of the page. Then, click Options and select Restore your OneDrive.

If you're signed in with a work or school account,  click the Settings cog at the top of the page. Then, click Restore your OneDrive.

2. On the Restore your OneDrive page, select a date from the drop-down list. Note that if you're restoring your files after automatic ransomware detection, a restore date will be selected for you.

3. After configuring all of the file restoration options, click Restore to undo all the activities you selected.

The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups.

Frequently Asked Questions (FAQ)

How was my computer hacked and how did hackers encrypt my files?

Users often infect their computers with ransomware by downloading and opening files from unreliable sources such as P2P networks, third-party downloaders, and free file hosting sites. Also, cybercriminals often send malicious files or links via email, use fake installers, cracking tools, and pirated software to trick users into infecting computers.

How to open ".MEDUSA" files?

These files are inaccessible and unusable unless a decryption tool is obtained.

Where should I look for free decryption tools for MEDUSA ransomware?

In case of a ransomware attack you should check the No More Ransom project website (more information above).

I can pay you a lot of money, can you decrypt files for me?

Unfortunately, we cannot provide the decryption service for files encrypted by ransomware. In most cases, decryption is only possible with the help of the ransomware developers unless there is a flaw in the ransomware's encryption method. As a result, be cautious of third parties offering paid decryption services, as they may be scammers or act as middlemen.

Will Combo Cleaner help me remove MEDUSA ransomware?

Combo Cleaner is a program that can scan your computer and remove active ransomware infections. Removing ransomware prevents further damage. However, antivirus software cannot decrypt encrypted files.

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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 malware activity level today:

Medium threat activity

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

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