Ooss Virus Removal Guide (+Decrypt .ooss files)

Ooss Virus Ransomware

Ooss is a malicious software application functioning as typical ransomware. Michael Gillespie, the widely known malware researcher, first discovered this new name in the DJVU ransomware family.

Ooss was developed for the sole purpose to encrypt all popular file types. Rationally, as soon as the encryption is effectively achieved, the users are not able to get access to them. Ooss ransomware includes its own “.ooss” to all the encrypted files. For example, the file “price_list.xls”, when modified by Ooss, will be entitled as “price_list.xls.ooss”. Once the encryption is accomplished, Ooss puts its own distinct text file (_readme.txt) into all the folders that keep the encrypted files.

The message stated by document asking for the random os very similar to the notices offered by other ransomware risks coming from the DJVU family. The warning generally indicates that the files have been encrypted and the only option to get access to it is to use a special standalone key. Regretfully, this declaration is definitely true.

The method to encrypt the files used by Ooss is not completely investigated. Nevertheless, there is no doubt that each computer system owner might be released a special decryption key, which is definitely unique. It is incredibly difficult to recover the information without the suitable key in location.

“Don’t worry, you can return all your files!”, from text file message:

message from Ooss virus

One more peculiarity of the Ooss virus is that the users are not able to get access to the key. The decrypting key is hosted on a special server under the total control by the crooks who have launched the Ooss infection into the internet. In order to acquire the key and bring back the essential information, the users are told to connect with the scams by means of e-mail or by telegram and to pay the ransom in the amount of $980.

The message likewise says that the people ought to call the Ooss authors within 72 hours upon the moment of the information file encryption. The alert indicates that by doing so the people will obtain a 50% discount, therefore, the ransom quantity drops down to $490.

No matter what the amount of the ransom is, we strongly advise that you do not pay the ransom. There is no warranty that these online crooks will keep their pledges, so they may not care at all what the victims feel about the file encryption, even when the amount of the ransom is gotten into their accounts. Thus, paying ransom typically does not lead to a successful recovery. So, the users might merely lose their money for nothing.

Likewise, we urge you not to get in touch with the frauds as they advise. Do not transfer money into their wallets. There are no applications that might crack the Ooss ransomware or restore the data for free. For that reason, the only correct choice is to restore the data from possible backups (if available).

Virus Summary

NameOoss Ransomware
File Extensionooss
Short DescriptionThe ransomware encrypts all the data stored on your system and requires a ransom to be paid on your part supposedly to recover your important files.
SymptomsFile encryption by the ransomware is performed by means of the AES-256 algorithm (CFB mode) encryption algorithm. Once the encryption is completed, the ransomware adds its special .ooss extension to all the files modified by it.
Distribution MethodAdware bundles and software cracks
Similar InfectionsMmnn, Rooe, Bboo
Removal Tool   GridinSoft Anti-Malware

Do not forget that the Web is now loaded with infections comparable to the Ooss ransomware. For example, this specific hazard is essentially identical to Brusaf and other ransomware-type infections. These damaging utilities have actually been established in order to encrypt the essential information and reveal the demand for the users to pay the ransom. All these infections utilize the similar algorithm to produce the particular key for effective information decryption.

Unless the Ooss ransomware is still under the advancement process or has actually got some concealed bugs, it is not possible to bring back the data manually. Thus, the only working service to prevent the loss of your essential data is to regularly keep up-to-date backups of all your essential files.

Another essential piece of suggestions is to save the backups on special storage not connected to your primary device. For instance, you may store it on the USB Flash Drive, or some external hard disk drive, or by using the cloud data storage services. Keeping the backups on your routine drive is really risky, because the backup may also be secured by the Ooss infection.

Leaks for the Ooss ransomware attack.

Ooss utilizes numerous paths to penetrate the vulnerable computer systems. It is not specific what particular technique was utilized in your case, nevertheless, the intrusion may occur through the following channels:

  • bundling with third-party programs, generally free software;
  • spam emails from the unidentified senders;
  • sites providing free hosting;
  • P2P (peer-to-peer) torrent downloads.

There are times when the Ooss might camouflage itself as some real application, for example, through the misleading signals requiring setup of some software update. This is the most typical trick used by the frauds to inject the Ooss infection files into the system. By doing this users partially participate in its installation, without clearly understanding the danger.

In addition, the frauds may send unsolicited spam email with challenging signals motivating the people to open suspicious attachments or click on some download links, for instance, those motivating the people to open particular pictures, text files, tax files and other information.

No doubt, opening these files or clicking on the malicious links may essentially harm the system. Fake Adobe Flash Player upgrade alerts may result in the Ooss ransomware seepage. Likewise, downloading the broken software application may in addition consist of the ransomware installer. The last but not the least, setup of Ooss might happen through some Trojan horses that might be set up stealthily into the system and without the user’s direct consent and even permission.

Avoiding the Ooss attack.

Naturally, there is no outright guarantee that your computer will be constantly free of any malware attacks, nevertheless, we would like to share some helpful ideas with you to make it more secure. Ensure to pay extremely attention while browsing the web and especially while downloading cost-free programs. Do not open any suspicious email attachments, especially if the sender is not understood to you.

Do not forget that specific freeware installer may likewise contain some other additional apps in the package. These additional applications may be really destructive. It is of utmost value to keep your anti-virus software and your os in general to be always effectively updated.

It is rather logical that downloading pirated software is prohibited, however, in addition, such unapproved programs usage might also bring serious damage to your computer. For this reason, do not download any broken programs. Plus, the fact that your existing anti-virus did not protect the system from the Ooss ransomware is a great reason for you to reevaluate your choices and switch to another program that can render the securing functions on a much better level.

Below please find the quotation from the Ooss text file:

 Don't worry, you can return all your files!
 All your files like photos, databases, documents and other important are encrypted with strongest encryption and unique key.
 The only method of recovering files is to purchase decrypt tool and unique key for you.
 This software will decrypt all your encrypted files.
 What guarantees you have?
 You can send one of your encrypted file from your PC and we decrypt it for free.
 But we can decrypt only 1 file for free. File must not contain valuable information.
 You can get and look video overview decrypt tool:
 Price of private key and decrypt software is $980.
 Discount 50% available if you contact us first 72 hours, that's price for you is $490.
 Please note that you'll never restore your data without payment.
 Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours.
 To get this software you need write on our e-mail:
 Reserve e-mail address to contact us:

 Our Telegram account:

Screenshot of files with “.ooss” extension added by the virus:”

Ooss Ransomware - encrypt files with .ooss extension

Use GridinSoft Anti-Malware to remove Ooss ransomware from your computer

1.Download GridinSoft Anti-Malware.

You can get GridinSoft Anti-Malware by clicking the button below:

  GridinSoft Anti-Malware

2. Double-click on the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-ag.exe file to install GridinSoft Anti-Malware on your computer.
GridinSoft Anti-Malware
An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.
GridinSoft Anti-Malware Setup

3. Press Install button for run GridinSoft Anti-Malware.

GridinSoft Anti-Malware Install

3.Once installed, GridinSoft Anti-Malware will automatically run.

GridinSoft Anti-Malware  Start

4. Wait for the GridinSoft Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your computer for Win Speedup 2018 and other malicious programs. This process can take a 20-30 minutes, so we suggest you periodically check on the status of the scan process.
GridinSoft Anti-Malware Scan

5. Click on “Clean Now”.

When the scan has completed, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.
GridinSoft Anti-Malware Scan Result

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About Daniel Zimmermann

Daniel Zimmermann has been writing on security and malware subjects for many years and has been working in the security industry for over 10 years. Daniel was educated at the Saarland University in Saarbrücken, Germany and currently lives in New York.

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