How to uninstall Avaddon from a computer?

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

Avaddon ransomware removal instructions

What is Avaddon?

Avaddon encrypts files with AES encryption algorithm and encrypts AES key by using RSA algorithm. Also, it changes desktop wallpaper and renames all files by appending the ".avdn" extension. For example, it renames a file named "1.jpg" to "1.jpg.avdn", "2.jpg" to "2.jpg.avdn", and so on. Instructions on how to access the website that victims supposed to use to pay a ransom are provided in the "[random_numbers]-readme.html" file. Avaddon drops this file in every folder that contains encrypted files. This ransomware was discovered by GrujaRS.

As stated in the ransom note (HTML file), Avaddon encrypts documents, photos, databases and other important files and it is impossible to decrypt them without software called "Avaddon General Decryptor". Victims can purchase this decryption tool by following the instructions that are provided Tor website. That Tor website contains information such as price of the aforementioned decryption tool, how much time victims have to purchase it until its price is doubled, and some other details. It is stated that decryption software costs 0.05346968 of Bitcoin and it has to be purchased by transferring this amount of BTC to the provided address (BTC wallet). Although, if victims will not purchase it in 7 days and 12 hours, then its price will be doubled. Victims supposed to receive the Avaddon General Decryptor after the transaction (when the payment is confirmed). Although, it is strongly recommended not to pay a ransom to these cyber criminals, it is very likely that they will not send a decryption tool even after meeting all their demands. Unfortunately, there are no free tools that could decrypt files encrypted by this ransomware (its developers are the only ones who the right decryption tool). In such cases victims can avoid data loss by restoring files from a backup. Also, it is possible to prevent further encryptions (encryptions of unencrypted files) by uninstalling ransomware from a computer. Although, files encrypted data remains encrypted even when that malware is not longer installed on the operating system.

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

Avaddon decrypt instructions (readme.html)

To sum up, in most cases malware like Avaddon is designed to encrypt victim's files so they could not decrypt them without a certain software and/or decryption key and provide instructions on how to purchase it. A couple of examples of other ransomware are Kkll, Professeur and PGP. Usually the main differences are size of a ransom and encryption algorithm that ransomware uses to encrypt data. Also, it is very common that cyber criminals behind ransomware are the only ones who have the tools that can decrypt files that were encrypted by it. It is possible to decrypt data without their tools only when ransomware is not finished (has some bugs, flaws). Since it does not happen often, it is recommended to always have data backed up and store it on some remote server or unplugged storage device.

How did ransomware infect my computer?

Typically, users infect computers with malware (including ransomware) through malspam campaigns, unofficial software activators and updaters, unreliable file and software download channels and Trojans. It is common that cyber criminals use spam campaigns as tools to proliferate malware by sending emails with malicious attachments or website links that are designed to download malicious files. They attempt to trick users into executing a malicious file by disguising their emails as important, official and/or legitimate in other ways. When recipients open a malicious file, they cause installation of malware. Examples of files that cyber criminals attach to their emails are malicious Microsoft Office documents, executable files (like .exe), JavaScript files, PDF documents, archive files (like ZIP, RAR). Also, quite often users infect computers when they use various unofficial, third party activation tools to activate licensed software. Such tools supposed to bypass activation for free, although, quite often they simply install malware instead. The same applies to third party updaters - instead of updating software they install malicious software. Also, they can cause it by exploiting bugs, flaws of installed software that is out of date. Furthermore, malicious software can be distributed through unreliable download channels too. For example, third party downloaders, unofficial websites, Peer-to-Peer networks (like torrent clients, eMule), freeware download sites, free file hosting pages, etc. Systems get infected when users open/execute malicious files that were dowloaded through such channels. It is worthwhile to mention that such files often are disguised as regular, legitimate. Trojans are malicious programs that can be designed to distribute malware - cause chain infections. However, they can install additional malware only when they are already installed on user's computer.

Threat Summary:
Name Avaddon virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .avdn, random string (depends on the variant)
Ransom Demanding Message readme.html (with random numers in its name), desktop wallpaper and Tor website
Ransom Amount 0.05346968 of Bitcoin
BTC Wallet Address 3JtU8efLk6c176nnntDYCTyBg9biuSdKiE
Detection Names Avast (JS:Downloader-FYY [Trj]), BitDefender (Exploit.HTML.BitsAdmin.Gen), ESET-NOD32 (PowerShell/TrojanDownloader.Agent.DV), Kaspersky (HEUR:Trojan-Downloader.Script.Generic), Full List Of Detections (VirusTotal)
Rogue Process Name 237502353.exe (its name may vary)
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)

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How to protect yourself from ransomware infections?

All software should be downloaded only from official, trustworthy websites and direct links. Third party downloaders, installers and other channels that are mentioned in the previous paragraph can be and often are used to proliferate malware. Installed software must be updated and activated (if necessary) through tools and/or functions that are designed (provided) by its developers. Unofficial, third party updating and activation tools should never be used. Besides, it is not even legal to activate licensed programs with various 'cracking' tools (third party activators). Also, it is important not to open attachments or links in irrelevant emails that are received from suspicious, unknown addresses. Email contents should be opened only when there is no doubt about its safety. Additionally, it is recommended to regularly scan the operating system for threats with a reputable antivirus or anti-spyware software. Such software should be always up to date. If your computer is already infected with Avaddon, we recommend running a scan with Malwarebytes for Windows to automatically eliminate this ransomware.

Appearance of "[random_numbers]-readme.html" file (GIF):

avvadon readme.html file in gif image

Text in this HTML file:

Your network has been infected by Avaddon
All your documents, photos, databases and other important files have been encrypted and you are not able to decrypt it by yourself. But don't worry, we can help you to restore all your files!


The only way to restore your files is to buy our special software - Avaddon General Decryptor. Only we can give you this software and only we can restore your files!


You can get more information on our page, which is located in a Tor hidden network.


How to get to our page
Download Tor browser - hxxps://
Install Tor browser
Open link in Tor browser - avaddonbotrxmuyl.onion
Follow the instructions on this page
Your ID:





Appearance of the Avaddon's Tor website (GIF):

avvadon tor website

Text in this website:

Your network has been infected by Avaddon


Don't worry, we can help you to restore all your files!


Avaddon General Decryptor price is 500 USD* 7:11:58:31
*If you don’t pay before the time runs out, the price will be doubled!


All your documents, photos, databases and other important files have been encrypted!


To restore all your files you need to buy our special software - Avaddon General Decryptor!


You can do it right now. Follow the instruction below. But remember that you do not have much time!
500 USD
≈ 0.05346968 BTC


1. Buy the Bitcoin cryptocurrency. You will find instructions how you can do it below.


2. Send 0.05346968 BTC to the address: 3JtU8efLk6c176nnntDYCTyBg9biuSdKiE (in ONE payment, this amount doesn’t include the transaction fee)


3. The transaction will be confirmed after receiving 6 confirmations


4. When the payment is confirmed, you can download the Avaddon General Decryptor.


Please be careful and visually check the address after copy-paste (because on your PC there is probably a malware monitoring and changing the address in your clipboard)


How to buy Bitcoin

- Buy Bitcoin from a bank account or by bank transfer
Coinmama, Bitpanda, Coinfloor, Kraken, Coinfinity, BTC Direct, Change Invest, Coinbase, EXMO, CEX.IO, Bitfinex, Bitstamp, Gemini, Lykke, BTCBIT

- Buy Bitcoin through PayPal
Etoro, Local Bitcoins

- Buy Bitcoin with a Credit/Debit Card
Changelly, Bitpanda, Bitstamp, Coinbase, EXMO, CEX.IO, Lykke, BTCBIT, Change now

- Buy bitcoin in cash or cash deposit
Local Bitcoins, Bitquick, Libertyx, Bit it, Bitcoin ATMs, Bitcoin ATM Radar

Screenshot of Avaddon's desktop wallpaper:

Avaddon ransomware wallpaper ()

Screenshot of Avaddon's malicious process running in Task Manager as "237502353.exe" (its name may vary):

avvadon 237502353.exe malicious process in task manager

Screenshot of files encrypted by Avaddon (".avdn" extension):

Files encrypted by Avaddon ransomware (.avdn extension)

Update June 10, 2020 - Cyber criminals have recently started an email spam campaign to spread Avaddon ransomware. The text within email is a mere smile - ";)". However, the email subject is "Your new photo?" and it also contains an archive file attached - "". The archive contains a JavaScript file named "IMG159131.jpg". For users who do not have the "display file extensions" option enabled the file seems like an ordinary image (.jpg format), while in reality it is a script designed to download and execute Avaddon ransomware.

Screenshot of the spam email:

Spam email spreading Avaddon ransomware

Screenshot of a website displayed after paying a ransom for Avaddon's developers (note that paying does not mean that your files will be decrypted - in most cases crooks scam victims and paying gives no use):

Avaddon ransomware decrypter website

Update June 26, 2020 - One of the victims have confirmed that paying doesn't give any value - the Download button for decryption tool doesn't work. It leads to a non-existing page:

Avaddon ransomware decryptor download page

Update July 1, 2020 - A new variant of Avaddon ransomware has been discovered. This variant drops a different ransom note, sets a different desktop wallpaper and adds a random file extension.

Screenshot of this variant's ransom note:

Avaddon ransom note ([random]_readme.html)

Text presented within:

Your network has been infected!
All your documents, photos, databases and other important files have been encrypted and you are not able to decrypt it by yourself. But don't worry, we can help you to restore all your files!

The only way to restore your files is to buy our special software. Only we can give you this software and only we can restore your files!

You can get more information on our page, which is located in a Tor hidden network.

How to get to our page
Download Tor browser - hxxps://
Install Tor browser
Open link in Tor browser - ZY010ndXea30XMmPb5s.avaddonbotrxmuyl.onion/?AdYOgB3ONcK
Follow the instructions on this page
Your ID:




Screenshot of this variant's desktop wallpaper:

Avaddon ransomware desktop wallpaper (2020-07-01)

Text presented within:

Files are encrypted

Find: Hl_readme.html
in folders or on your desktop!

You have a few days TO PAY or

Screenshot of files encrypted by this variant (random extension):

Avaddon ransomware encrypted files (2020-07-01)

Example of a ransom note ("G_readme.html") delivered by yet another Avaddon ransomware variant:

Avaddon ransom note (G_readme.html - 2020-07-30)

Text presented within:

Your network has been infected!
Your files are locked due to a vulnerability in your system

You will not be able to decrypt the files yourself, in the worst case you can destroy the data irreversibly.

The only way to unlock your data is to buy the decryption program.

Go to the link written below to more details.

If you do not pay for recovery, then all the confidential data from your computer WILL BE TRANSFERRED TO PUBLIC ACCESS. Follow the instructions below to restore your files and keep them confidential.

If you cannot do this yourself, find a data recovery company in internet.

They cannot help you unlock your data, because only we have decryption key, but will help you make a payment and provide you guarantees.


Also, I ask you to note, you have no long time, if you do not make payment soon, the price for the decryptor will double. So I recommend you dont waste time and move!

How to get to our page
Download Tor browser - hxxps://
Install Tor browser
Open link in Tor browser - zcQ3LA.avaddonbotrxmuyl.onion/?5JM0UXN905lovYAeikPgkwa9nY
Follow the instructions on this page
Your ID:



Avaddon ransomware removal:

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Malwarebytes 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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Quick menu:

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 a ransomware that is not supported by ID Ransomware, you can always try searching the internet by using certain keywords (for example, ransom message title, file extension, provided contact emails, cryptowallet 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, cyber criminals 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 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 EaseUS Data Recovery Wizard Pro. 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).

▼ Download
EaseUS Data Recovery Wizard Pro

By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Trial version of EaseUS Data Recovery Wizard Pro is capable of scanning drives and listing recoverable files - to restore them, you must purchase a license.

Step 1: Perform a scan.

Hover your mouse over the partition you wish to scan and select "Scan". You can also select a specific folder, or click shortcut icons to scan the Desktop or Recycle Bin: Scanning the storage drive with EaseUS Data Recovery Wizard PRO (step 1)

Wait for EaseUS Data Recovery Wizard Pro 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 hundreds 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: Scanning the storage drive with EaseUS Data Recovery Wizard PRO (step 2)

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. Note also that the trial version of EaseUS Data Recovery Wizard Pro is only capable of scanning drives and listing recoverable files - to restore them, you must purchase a license: Recovering data with EaseUS Data Recovery Wizard Pro

Step 3: Save the scan session (optional).

We recommend that you save the scanning session once you have completed recovery, in case you decide to recover additional files later. Simply click the "Save Scan Session" icon in the upper-right corner of the screen and choose the location for the file to be saved. This will save a lot of time, since you will not need to re-scan the storage drive the next time you wish to restore something. Bear in mind, however, that data removed after the scanning session has finished will not be listed: Saving scan session in EaseUS Data Recovery Wizard Pro

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 necessary information on Microsoft's documentation web page.

Data backups: The most reliable backup method 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 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. Therefore, you should consider using an application to create data backups locally.

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EaseUS Todo Backup

By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for EaseUS Todo Backup. 30 days free trial available.

We recommend using the EaseUS Todo Backup application. The "Home" edition of EaseUS Todo Backup is usually more than adequate for regular users, however, the "Business" edition is more suitable for companies and large computer networks. The EaseUS Todo Backup application provides extensive data protection features. You can easily create backups, and encrypt and compress them for enhanced protection and storage saving purposes. It also allows you to set backup schedules, create bootable devices, and restore the system if a crash occurs. You can easily choose where to store the created backup: locally; uploaded to an external drive; FTP; cloud storage, or elsewhere. In summary, EaseUS Todo Backup is an all-in-one tool, which provides all features required to properly backup your data.

Creating a data backup:

The backup process is virtually identical regardless of the item (file, partition, entire system) you wish to backup. Taking the File Backup feature as an example:

Step 1: Choose which item to backup.

Click on the "Menu" icon in the upper-left corner of the screen to reveal the menu and select "File Backup": Creating data backups with EaseUS Todo Backup tool (step 1)

Select the files you want to backup. You can also enter a name and description of the backup that will be created: Creating data backups with EaseUS Todo Backup tool (step 2)

Step 2: Change the default settings.

The EaseUS Todo Backup application provides a variety of additional options that can be added/modified while creating the backup. For example, you can encrypt data (add a password), select the compression rate (how much the backup should be compressed), performance (how many system resources should be allocated), add an email notification (you receive an email once the process is complete) and so on.

To open the options window, click the "Backup options" button in the lower-left corner of the screen: Creating data backups with EaseUS Todo Backup tool (step 3)

Select the settings you want to change and click "Save". You can also reset your changes by clicking "Reset to initial settings": Creating data backups with EaseUS Todo Backup tool (step 4)

Step 3: Select the backup destination.

As mentioned above, EaseUS Todo Backup allows you to choose where backups are saved - locally or externally.

Click the "Browse..." button and select the location you want the backup to be saved: Creating data backups with EaseUS Todo Backup tool (step 5)

Step 4: Safety measures and process completion.

Depending on the location you have chosen, there are a number of measures you should or should not take. If you are uploading to an internet-connected location (for example, Cloud storage, FTP, etc.), be sure to maintain your internet connection, otherwise you will have to start again. The same applies to external storage devices - do not unplug them until the process is complete.

The progress bar displays estimated time remaining until completion. Large backups (hundreds of gigabytes) can take hours to create (depending on storage device speed, internet connection, etc.). Therefore, the application also allows you to optionally choose what the system should do (shut down, sleep or hibernate) once the process has finished: Creating data backups with EaseUS Todo Backup tool (step 6)

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

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 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.

QR Code
Avaddon 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 Avaddon virus on your mobile device.
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