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News | 11/10/2017

Osiris Ransomware – How To Remove Osiris Virus From Computer

About : Osiris ransomware is 7th generation of Locky ransomware, a ransomware family well-known for its encryption techniques. Osiris like other ransomware will encrypt the user’s data and demand ransom to release the decryption key.
Osiris ransomware logo

What is Osiris ransomware?

Osiris ransomware is 7th generation of Locky ransomware, a ransomware family well-known for its encryption techniques. Osiris like other ransomware will encrypt the user’s data and demand ransom to release the decryption key. It first appeared on 5th December 2016. Since then it has constantly been improving, and the new version of this ransomware has got some new codes that make it invisible to our regular anti-virus software.

The encryption technique used by Osiris ransomware is “RSA-2048” and “AES-128” encryption, which is impossible to break so far. Once the ransomware is on the system, it would change the file extension of all the files to “.osiris” and then leave a ransom note “OSIRIS-9b28.html” demanding the ransom included are the details on how to make the payment.

file extension

Below you can see an example of the ransom note.

Your records are now encrypted!

[All your necessary files present in the computer is now compromised: Videos, images, and other documents. Here you can verify the list of encrypted documents.

Encryption is carried through a unique public key RSA-2048 which was explicitly generated for this computer. To gain the control of your files, you need to buy the decryption key.

The only copy of your decryption key that will help you decrypt your files is located in the secret server. The key would be destroyed in the specified time. After which, nobody or no one can help you to recover your files

To obtain the decryption key of this computer that will automatically decrypt the files you have to pay [a specific ransom in EUR or USD].

Click To select the method of payment and the currency.

Any attempt you make to close or remove the encryption will immediately destroy the decryption key.]


What should be your next move?

By any chance, if you believe that your computer could be infected with this infection, do not hesitate to eliminate Osiris ransomware. This is the most straightforward approach to end its movement on your operating system. If you let this malware remain on your PC, this ransomware can cause significantly more harm by encoding another bit of your documents. Since quite possibly this infection is back online, we highly recommend you to run a full system scan with malware removal tool.

Also Read: DnsBasic virus and its removal

Should you pay the ransom? A big “NO”.

Despite the fact that we highly suggest not paying the ransom, we understand that a few organizations would not have the capacity to get away without the information that has been put away on the encrypted PCs, so unfortunately in such cases, paying the ransom will be the only option to advance the business. Also, we can just advice you to not pay the amount. Remember that you can never be sure whether the criminals would give you a working decryption key.

Things you must know about a ransomware attack

There have been incidents showing the users were hit by the same ransomware for the second time, even though they have already paid the ransom. From here, all that we can say is if you don’t act quickly and the right way, you might not get a second chance.

So, the best solution for this is to get rid of the ransomware using the steps given at the bottom of this article.

Distribution technique used to spread ransomware:

  1. The latest versions of Locky ransomware, Osiris, is being broadcasted through emails that disguise to have a useful information from the user's workplace. For example, The subject might contain - "Photograph/Scan/Document from office." Such messages contain a Malicious attachment in the .zip file, which once opened or downloaded drops .vbs file on the system.
  2. Unofficial software downloads, (for example, freeware download sites, free document facilitating sites, torrents, eMule, etc.) regularly introduce malicious executables as genuine programming. In doing such, these sources fool users into downloading and running malware. These malware's essentially open "entryways" for other malware to invade the system. These are the most widely recognized approaches to distribute ransomware.

Remove Osiris ransomware in Safe Mode with Command Prompt

Step – 1 (enter safe mode)

  1. Steps to be followed to enter the safe mode Win XP/Vista/7
  2. Click start, then shutdown, then restart.
  3. While the computer is booting up at the very first screen start tapping F8 until you see the advanced boot options.
  4. In the advanced boot option’s, you need to select safe mode with Command prompt from the list of given options.

Steps to be followed to enter safe mode in Win 8/10.

  1. On the windows login screen, you need to press the power option.
  2. Now, press and hold the shift key on the keyboard, and then click restart.
  3. Now, among the list of options you need to select Troubleshoot, and then advanced options, then startup settings and finally press restart.
  4. Once your computer restarts and gives you the list of startup options you need to select Enable Safe Mode with Command prompt. 

Step – 2 (Restore system)

  1. Once you see the command prompt windows, type in cd restore and hit enter on the keyboard.
  2. Now, type rstrui.exe and hit Enter again.
  3. Then you would see new windows, click on next over there and select a restore point that is before the date of infection.
  4. Then, click next and followed by yes.

After temporarily disabling the ransomware, we need to create a strong firewall to fight against such intrusions in future.

Steps to be followed:

  1. Enable your popup blocker: Pop-ups and ads in the websites are the most adoptable tactic used by cybercriminals or developers with the core intention to spread malicious programs. So, avoid clicking uncertain sites, software offers, pop-ups etc.
  2. Keep your Windows Updated: To avoid such infections, we recommend that you should always keep your system updated through automatic windows update. By doing this you can keep your device free from virus. According to the survey, outdated/older versions of Windows operating system are an easy target.
  3. Third-party installation: Try to avoid freeware download websites as they usually install bundled of software with any installer or stub file.
  4. Regular Backup: Regular and periodical backup helps you to keep your data safe in case the system is infected by any kind of virus or any other infection. Thus always backup important files regularly on a cloud drive or an external hard drive.
  5. Always have an Anti-Virus: Precaution is better than cure. We recommend that you install an antivirus like  McAfee or a good  Malware Removal Tool like Download Free Virus Removal Tool
  6. Install a powerful ad- blocker for  ChromeMozilla, and IE.

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