What to Do If Your PC Gets Infected by Osiris.DLL

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Osiris ransomware is a nightmare for most computer owners because it can lead to serious trouble. It is a nasty piece of ransomware that demands payment from the affected user. Just like any other ransomware, the Osiris ransomware encrypts the user’s files and demands payment for their release. Your first instinct would be to pay up just to get rid of the threat. But hold on to that thought because paying the ransom does not mean that the cybercriminals will actually release the key to decrypt your data. In fact, according to Kaspersky, 17% of the organizations who paid the ransom did not recover their data. So paying up these cybercriminals does not guarantee that you’ll get your data back.

So, what do you do when you get the Osiris.DLL malware? It can be nerve-wrecking at first, but Osiris.DLL is not without a solution. In this guide we’ll provide you with all the information about the Osiris.DLL ransomware and what you can do to get out of this bind.

What is Osiris.DLL?

Is Osiris.DLL a virus? It is not a virus, but a ransomware, the scary brother of viruses. Osiris.DLL or the Osiris ransomware belongs to the Locky family of malware, and is the latest variation in the string of aesir and .zzzzz file viruses.

Osiris is the name of the Egyptian god of the dead, and is the inspiration behind the Osiris ransomware. Just like the other viruses in the family, Osiris prefers to execute its activity through a DLL command. This is because a DLL file allows better communication and interrelation between several apps simultaneously. Plus, it doesn’t take up much space compared to .exe files.

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When you get the Osiris ransomware, it is very obvious because you’ll get a glaring notification on your screen saying that you’ve been infected and that you won’t be able to access your important files. The attacker will provide you with instructions on how much ransom to pay, how to send the payment, how the decryption key will be sent, and what you need to do to decrypt the file. Here is one of the typical message that Osiris ransomware usually pasted:


All of your files are encrypted with RSA-2048 and AES-128 ciphers.

More information about the RSA and AES can be found here:



Decrypting of your files is only possible with the private key and decrypt program, which is on our secret server.

To receive your private key follow one of the links:

[link to the key]

If all of this addresses are not available, follow these steps:

    1. Download and install Tor Browser;
    2. After a successful installation, run the browser and wait for initialization.
    3. Type in the address bar: [series of letters and numbers]
    4. Follow the instructions on the site.

!!! Your personal identification ID: [series of letters and numbers]

Keep in mind, however, that cybercriminals rarely keep their word. So instead of paying up the ransom that would just fund other malware attacks, you are better off finding a way to get rid of the ransomware on your computer. And to do that, you need a clear understanding of how the Osiris.DLL ransomware works.

What Does Osiris.dll Do?

The Osiris ransomware is the seventh generation of the Locky ransomware and crypto virus family, which is traditionally distributed through SPAM campaigns and illegal downloads. This is a heavily modified version of the initial variant that wreaked havoc in June 2016. It can be quite difficult to detect when it first infected your computer because it uses standard Windows system files to download and execute the payload.

Years before, losing your data because of ransomware is manageable because that data can still be recovered through backup solutions. However, Osiris now directly attacks the Microsoft Volume Shadow Copy Service (VSS) found in every copy of MS Windows and gets rid of the already created Shadows copies, making it impossible to recover the affected files. Osiris also uses a strong encryption that cannot be decrypted by ordinary third-party tools. It uses RSA-2048 and AES-128 algorithms which are impossible to decrypt right now.

Based on the name of the malware, Osiris adds a .osiris suffix to all the encrypted files and modifies the filename to follow a particular format.

Here is what a typical encrypted Osiris file would look like: [8_random_characters]-[4_random_characters]-[4_random_characters]-[8_random_characters]-[12_random_characters].osiris

Osiris changes the background of the desktop to an image that contains the instructions about the ransom. Payment is usually demanded in Bitcoin so that authorities are not able to track it.

Osiris creates three copies of files on your computer:

  • OSIRIS.bmp
  • OSIRIS.html
  • OSIRIS_[4_digit_number].html

Osiris affects not only Windows computers, but Macs and Android devices as well.

How to Remove Osiris.DLL

Osiris ransomware is on a different level compared to other types of malware. If your computer got infected by the Osiris malware, you need to remove the malware first using our malware removal guide, then clean up your system using a PC cleaner.

After that, try to decrypt the data or restore your files using the fixes below:

Fix #1: Use a Third-Party Decryptor.

Most decryptors won’t work because Osiris uses a strong encryption algorithm. However, Kaspersky has recently released a decryptor that claims to be able to decrypt more ransomware files. You can also try the decryptors over at NoMoreRansom.org to see if there is a tool appropriate for Osiris. You just need to upload a sample file from your computer and the website will try to match it with the available tools for decryption.

Fix #2: Restore the Encrypted Files Using Recovery Software.

If you are not able to decrypt the files, you can use recovery tools instead to try and restore them. Recuva, EaseUS Data Recovery Wizard Free, and R-Studio are some of the third-party tools you can try. If this does not work or the files you have recovered have been corrupted, you can try to recover the shadow copies of the files instead using Shadow Explorer.

Fix #3: Restore the File Using Windows Previous Versions.

This might be a long shot, but you can try recovering the previous version of the file using the steps below:

  1. Right-click on the infected file and select Properties.
  2. Choose the Previous Versions tab.
  3. Select the particular version of the file, then click Copy.
  4. To restore your selected file and replace the existing file, click Restore.


Osiris ransomware is a very insidious malware wherein the attacker holds your files hostage and asks for ransom before releasing them. However, security experts advise against paying up the ransom because there is no guarantee that the cybercriminals will give the correct decryption. Most cybercriminals ignore the affected user after the money has been received while others try to extort more money from the user. If you’re unlucky and your device got infected with Osiris ransomware, you need to remove the malware first from your computer using a robust anti-malware program before trying to decrypt or restore your files.

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