*.osiris Ransomware

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

*.osiris ransomware removal instructions

What is *.osiris?

*.osiris is a new variant of Locky ransomware and virtually identical to *.zzzzz, *.thor, *.odin, and a number of other viruses. *.osiris was first discovered by R0bert R0senb0rg. Following infiltration, *.osiris encrypts stored data using asymmetric cryptography and renames encrypted files using the "[8_random_characters]-[4_random_characters]-[4_random_characters]-[8_random_characters]-[12_random_characters].osiris" pattern. For example, "sample.jpg" might be renamed to "GD89LL14-G8A1-9G01-AF1G9L1K-H0AK3LH0GM17". Following encryption, *.osiris creates an HTML file ("OSIRIS-ede4.html"), placing it on the desktop and changing the desktop wallpaper.

The HTML file and desktop wallpaper contain an identical message stating stated that files are encrypted using asymmetric encryption algorithm and that they can only be restored using a private key. Unfortunately, this information is accurate. During asymmetric encryption, two keys (public [encryption] and private [decryption]) are generated. *.osiris's developers store the private key on a remote server and victims are encouraged to pay a ransom of 2.5 Bitcoin (currently, 1 Bitcoin is equivalent to ~$750) to receive it. All payment instructions are provided on *.osiris's Tor website (link is given in the message). Be aware, however, that cyber criminals responsible for the development of ransomware-type viruses often ignore victims, despite submitted payments. Therefore, you are strongly advised to ignore all requests to pay a ransom or contact these people. It is highly probable that paying will not deliver any positive result and you will be scammed. It is currently impossible to restore files encrypted by *.osiris ransomware - you can only restore your files/system from a backup.

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

*.osiris decrypt instructions

There are dozens of ransomware-type viruses similar to *.osiris. Cerber, CTB-Locker, JohnyCryptor, Purge, and Dharma. These are just some examples. All ransomware has identical behavior - it encrypts data and makes ransom demands. The cost of decryption and type of encryption algorithm (symmetric/asymmetric) used are the only major differences. Cyber criminals often proliferate ransomware via spam emails (malicious attachments), peer-to-peer networks and other third party software download sources (Torrents, eMule, free file hosting websites, freeware download websites, etc.), rogue software update tools, and trojans. Therefore, never open any files received from suspicious email addresses or download software from unofficial sources. Note that cyber criminals are capable of exploiting software bugs/flaws to infect the system. Therefore, keep your installed applications up-to-date and never use any third party update tools. Using a legitimate anti-virus/anti-spyware program is also essential.

Screenshot of *.osiris HTML file ("OSIRIS-ede4.html"):

*.osiris decrypt instructions

Text presented within *.osiris desktop wallpaper and HTML file:

All of your files are encrypted with RSA-2048 and AES-128 ciphers.
More information about RSA and AES can be found here:
hxxp://en.wikipedia.org/wiki/RSA (cryptosystem)
hxxp://en.wikipedia.org/wiki/Advanced Encryption Standard
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:
If all of this addresses are not available, follow these steps:
1. Download and install Tor Browser: hxxp://www.torproject.org/download/download-easy.html
2. After a successful installation, run the browser and wait for initialisation.
3. Type in the address bar:
4. Follow the instructions on the site.
!!! Your personal identification ID: D56F3331E80D9E17 !!!
+*-++|| *==_*-a-

Screenshots of *.osiris Tor website:

*.osiris decrypt instructions (sample 1) *.osiris decrypt instructions (sample 2)

Text presented within this website:

Locky Decryptor™
We present a special software - Locky Decryptor™ -
which allows to decrypt and return control to all your encrypted files.
How to buy Locky Decryptor™?
You can make a payment with BitCoins, there are many methods to get them.
You should register BitCoin wallet:
Simplest online wallet or Some other methods of creating wallet
Purchasing Bitcoins, although it's not yet easy to buy bitcoins, it's getting simpler every day.
Send 2.5 BTC to Bitcoin address: 1BkR8zL6jAn8zcF4t6FM85DYLFG1dZ12ip
Note: Payment pending up to 30 mins or more for transaction confirmation, please be patient...
Refresh the page and download decryptor.
When Bitcoin transactions will receive one confirmation, you will be redirected to the page for downloading the decryptor.

Screenshot of files encrypted by *.osiris ("[8_random_characters]-[4_random_characters]-[4_random_characters]-[8_random_characters]-[12_random_characters].osiris" pattern):

*.osiris decrypt instructions

*.osiris ransomware removal:

Instant automatic removal of Osiris virus: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of Osiris virus. Download it by clicking the button below:
▼ DOWNLOAD Spyhunter By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

Quick menu:

Step 1

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

Step 2

Log in to the account infected with the *.osiris virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the *.osiris ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining *.osiris ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of *.osiris are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by *.osiris, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and Malwarebytes Anti-Ransomware, which artificially implant group policy objects into the registry to block rogue programs such as *.osiris ransomware.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove *.osiris ransomware:

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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Removal Instructions in other languages
Malware activity

Global virus and spyware activity level today:

Medium threat activity

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

QR Code
Osiris 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 Osiris virus on your mobile device.
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Platform: Windows

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