You have landed here means you are certainly not able to open your some important files. Is your files are substituted with random extensions having
[8_random_characters]-[4_random_characters]-[4_random_characters]-[8_random_characters]-[12_random_characters].osiris extension, it means your computer is attacked by Osiris virus.

Threat Description:

Osiris virus is a file-encrypting malware program that belongs to the family of Locky ransomware. This dangerous infection is out in the wild since 5th of December, 2016 and is still actively working to attack PCs and encrypt files to extort money.

Osiris Ransomware virus spreads through spam email campaigns. And once successfully installed, it uses strong ciphers RSA-2048 key and AES -256-bit encryption algorithm to encrypt files on the victim’s PC. It targets important documents, files, photos, videos, PDfs and so on of various extensions and append ransom characters along with .osiris extension. This means your files are no more accessible by any of the applications.

After encrypting the files, Osiris Ransomware drops three files on the desktop which are:

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

These files contains the ransom message and images that notifies users about the attack. The desktop screen is replaced by the ransom note that demands the payment of approx 2.5 Bitcoins that is around $1880.

There were various outbreaks of locky ransomware out of which Osiris virus is most enhanced one. As it is able to easily bypass the security detection and successfully carry out the encryption process. Lets dig deep about Osiris virus and learn about its removal process without paying ransom.

Osiris Ransomware virus Distribution methods:

The recent researches on arrival source of Osiris virus reports that it is uses spam email campaigns to distribute its payloads to the victims PC. The obfuscated emails are subjected as a invoice, job openings, offers or mails from higher authority. It also contains attachments that are in the zipped format. From its outlook the emails appear to be legitimate, thus users quickly agree to extract the zipped files.

Once user extracts the file, it drops .vbs extension file on the attacked system. The .vbs is a scripting language that is able to connect to the servers and execute the code. Thus, the Osiris virus gets activated on the host machine and it starts searching the files and directories for important files to encrypt.
Apart from spam emails, locky and its variants may also spread through phishing links, trojans and macro-enabled emails.

Thus users must avoid downloading attachments from unknown sender and never click on any scam links.

More about Osiris Ransomware virus

Once Osiris virus gets active on the victim’s computer, it starts searching the files of the various extensions.

The targeted file extensions are:

.sql, .mp4, .7z, .rar, .m4a, .wma, .avi, .wmv, .csv, .d3dbsp, 
.zip, .sie, .sum, .ibank, .t13, .t12, .qdf, .gdb, .tax, .pkpass, .bc6, 
.bc7, .bkp, .qic, .bkf, .sidn, .sidd, .mddata, .itl, .itdb, .icxs, .hvpl,
 .hplg, .hkdb, .mdbackup, .syncdb, .gho, .cas, .svg, .map, .wmo, .itm, .sb, 
.fos, .mov, .vdf, .ztmp, .sis, .sid, .ncf, .menu, .layout, .dmp, .blob, .esm,
 .vcf, .vtf, .dazip, .fpk, .mlx, .kf, .iwd, .vpk, .tor, .psk, .rim, .w3x, .fsh,
 .ntl, .arch00, .lvl, .snx, .cfr, .ff, .vpp_pc, .lrf, .m2, .mcmeta, .vfs0, .mpqge,
 .kdb, .db0, .dba, .rofl, .hkx, .bar, .upk, .das, .iwi, .litemod, .asset, .forge, 
.ltx, .bsa, .apk, .re4, .sav, .lbf, .slm, .bik, .epk, .rgss3a, .pak, .big, wallet, 
.wotreplay, .xxx, .desc, .py, .m3u, .flv, .js, .css, .rb, .png, .jpeg, .txt, .p7c, 
.p7b, .p12, .pfx, .pem, .crt, .cer, .der, .x3f, .srw, .pef, .ptx, .r3d, .rw2, 
.rwl, .raw, .raf, .orf, .nrw, .mrwref, .mef, .erf, .kdc, .dcr, .cr2, .crw, .bay,
 .sr2, .srf, .arw, .3fr, .dng, .jpe, .jpg, .cdr, .indd, .ai, .eps, .pdf, .pdd,
 .psd, .dbf, .mdf, .wb2, .rtf, .wpd, .dxg, .xf, .dwg, .pst, .accdb, .mdb, .pptm,
 .pptx, .ppt, .xlk, .xlsb, .xlsm, .xlsx, .xls, .wps, .docm, .docx, .doc, .odb,
 .odc, .odm, .odp, .ods, .odt

Whenever it finds the compatible extension, it encrypts the file by using a combination of RSA-2048 and AES-128 encryption keys. Thus the encrypted files gets locked with a 16 digit unique alphanumeric code also containing the symbols and .osiris file extension.

Thus the new name of the file after encryption becomes:

originalfilename.[8_random_characters]-[4_random_characters]-[4_random_characters]-[8_random_characters]-[12_random_characters].osiris extension

delete Osiris virus

Osiris Ransomware virus

The Ransom Note

After the encryption process is done, Osiris virus drops a ransom note to each of the folders where encryption is been done. The file is named as “OSIRIS-9b28.html” which explains the victim about the RSA-2048 and AES-128 encryption method through Wikipedia links.

The note further explains users that there is no way left for them to get back their files.In order to get the files back user needs to buy the decryption key by paying the ransom. To pay the ransom users need to install the “Tor browser” and carryout with the further instruction which redirects users to random payment website. The payment demanded from the victim is around 2.5 Bitcoins.Just like other ransomware, it too uses the bitcoins as the payment method to keep its identity anonymous and avoid detection.
The victim needs to buy the said Bitcoins from the provided website and then transfer Bitcoin to the given Bitcoin wallet of the ransomware authors.

Osiris ransomware also replaces the desktop wallpaper with locky ransomware which contains the ransom note written in red with black background. This is just too scary for any PC user.

The victims of the Osiris ransomware virus needs to immediately remove the threat using a professional anti-ransomware tool. We advise you not to pay them the ransom as it is not the complete solution. It is also no any guarantee that the ransomware authors will provide you the decryption key. Also if you have been the target once then next time you can be on their top list. So don’t encourage them by paying huge amount of your hard earned money. Rather i will suggest you should try other recovery methods which you can see in the end of this article.

How To Remove Osiris Ransomware virus Without Paying Ransom

In this guide, you will find removal instruction of Osiris Ransomware virus both manually and using anti-malware tool. At times, virus does not allow the installation or scanning of anti-virus program, so you need to switch to “safe mode with networking”. After that you can try recovery of your data if you have any backup or we have listed some methods which may help you to recover some of your data.

Use HitmanPro.Alert To Remove Osiris Ransomware(Recommended)”


HitmanPro.Alert is an advanced anti-malware program that takes on proactive approach towards threat behavior and its activities. Running HitmanPro.Alert on your computer will provide your real-time status, checks the browser integrity and alerts or any suspicious activity. So that you can have a safe browsing and online transactions. Read the full review of HitmanPro.Alert here.

Steps To Install And Run HitmanPro.Alert

  • Click on the provided link to download HitmanPro.Alert anti-malware;
    HitManPro.Alert Step1

    HitManPro.Alert Step1

  • Now, open the download folder to locate “hmpalert3”;
    HitmanPro.Alert Step 2

    HitmanPro.Alert Step 2

  • Click on it, to begin the installation;
  • It will ask your User Account control, if prompted click on “yes”; The download should begin shortly. HitmanPro.Alert window will appear, where you need to choose the options:
HitManPro.Alert Step3

HitManPro.Alert Step3

  • Choose Protection level as Maximum
    And tick the other boxes and finally click on “Install”.
    HitmanPro.Alert only takes 5MB of your memory and is very quick to install.
HitManPro.Alert Step4

HitManPro.Alert Step4

  • After the installation is complete, the scan will start. First scan may take up some minutes, as it will scan the whole computer.
    HitmanPro.Alert step 4

    HitmanPro.Alert step 4

  • The scan results are here. Carefully look down the list. You can here, the scan has found 1 Riskware and thousands of traces which can be risky.
    HitmanPro.Alert step 5

    HitmanPro.Alert step 5

  • You can select the threat to delete, quarantine, ignore or, mark as safe. If you want to remove all the threats, then simply click on the “Next” button below.
    HitmanPro.Alert step 6

    HitmanPro.Alert step 6

  • HitmanPro.Alert first creates a restore point and then starts the removal process. This helps to recover from any damage.
    HitmanPro.Alert step 7

    HitmanPro.Alert step 7

So, by performing the above steps, you can get rid of Osiris Ransomware.

Manually Find And Remove Osiris (Recommended Only For Advanced Users)

The manual steps guided below are the links separately made with caution, to avoid any confusion to our readers. Please follow the links below and perform them one by one. If you are going for the manual removal process, then we recommend you to print/download these instructions. Else open it from another uninfected computer or laptop and follow step-by-step manual removal instruction. Windows OS PDF Guide.

Method 1: Remove Osiris Ransomware and its associated files from the computer through safe mode with command prompt.

  1. Reboot your computer toSafe Mode with Command Prompt”
  2. End malicious process from “Task Manager
    1. Disable Auto-Startup Apps
    2. Remove Unwanted Programs From Scheduled Tasks
    3. Delete Temp Data and Prefetch
    4. Deleting “Registry Entries created by the Ransomware threat
  3. Deep Scan the infected computer to ensure complete removal (Recommended)

Click here to perform the step-by-step manual removal procedure.

Method 2: Remove Osiris Ransomware virus using System Restore Procedure

After that, the ransomware threat should go, but if it is still there. Then you need to try another method which is the “System Restore”. Click here to perform System Restore in Windows OS.

How to Restore the Encrypted Files?

Here is a separate article that guides users of various methods to recover their encrypted files. However, the ransomware makes sure the files may not be unlocked by other tools, but you should try them out.

Click here to know How you can restore the encrypted file.

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