Oohu Virus – Details
Oohu is a destructive software application working as typical ransomware. Michael Gillespie, the popular malware researcher, first found this new name in the DJVU ransomware family.
Oohu was developed for the sole function to encrypt all popular file types. Realistically, as quickly as the file encryption is successfully accomplished, the users are unable to get access to them. Oohu ransomware includes its own “.oohu” to all the encrypted files. For instance, the file “price_list.xls”, when modified by Oohu, will be titled as “price_list.xls.oohu”. Once the encryption is achieved, Oohu puts its own unique text document (_readme.txt) into all the folders that save the encrypted files.
The alert mentioned by _readme.txt asking for the random os extremely similar to the notices given by other ransomware dangers belonging to the DJVU family. The warning essentially shows that the data has been encrypted and the only option to get access to it is to use a distinct standalone key. Regretfully, this statement is absolutely real.
The approach to secure the files used by Oohu is not completely researched. However, there is no doubt that each computer system owner may be issued an unique decryption key, which is absolutely unique. It is extremely difficult to recuperate the information without the proper type in place.
“Don’t worry, you can return all your files!”, from _readme.txt message:
One more peculiarity of the Oohu infection is that the users are not able to get access to the key. The decrypting key is hosted on a special server under the complete control by the crooks who have launched the Oohu virus into the world wide web. In order to obtain the key and restore the essential information, the users are told to contact the frauds through email or by telegram and to pay the ransom in the amount of $980.
The message also says that individuals ought to get in touch with the Oohu authors within 72 hours upon the moment of the information encryption. The alert shows that by doing so individuals will obtain a 50% discount rate, for that reason, the ransom quantity drops down to $490.
Oohu crypted your files, nevertheless, it might not be the only risk on your computer. Plus, the ransomware might be hidden deep in the system. To detect and delete the threat completely, we recommend you to refer to the assistance of GridinSoft Anti-Malware .
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No matter what the amount of the ransom is, we highly advise that you do not pay the ransom. There is no assurance that these online criminals will keep their promises, so they might not care at all what the victims feel about the file encryption, even when the quantity of the ransom is gotten into their accounts. Hence, paying ransom often does not result in an effective recovery. So, the users may merely lose their money for absolutely nothing.
Likewise, we advise you not to call the scams as they advise. Do not move loan into their wallets. There are no applications that might crack the Oohu virus or restore the information at no charge. Therefore, the only correct choice is to restore the information from possible backups (if offered).
Virus Summary
| Name | Oohu Ransomware |
| File Extension | oohu |
| Type | Ransomware |
| Family | DJVU |
| Short Description | The 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. |
| Symptoms | File 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 .oohu extension to all the files modified by it. |
| Distribution Method | Adware bundles and software cracks |
| Similar Infections | Lokas, Besub, Nusar |
| Oohu Removal Tool | GridinSoft Anti-Malware |
| Oohu Decryption Tool | Emsisoft Djvu Decryptor |
Do not forget that the Web is now filled with infections comparable to the Oohu ransomware. For instance, this particular risk is basically identical to Brusaf and other ransomware-type infections. These destructive energies have actually been established in order to encrypt the essential data and express the need for the users to pay the ransom. All these infections utilize the similar algorithm to generate the particular key for successful files decryption.
Unless the Oohu ransomware is still under the advancement process or has actually got some hidden bugs, it is not possible to restore the information by hand. Thus, the only working solution to avoid the loss of your essential information is to frequently preserve up-to-date backups of all your crucial documents.
Another important piece of guidance is to keep the backups on special storage not linked to your primary device. For example, you may keep 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 system drive is extremely risky, given that the backup might also be secured by the Oohu virus.
Leakages for the Oohu ransomware attack.
Oohu utilizes numerous courses to infiltrate the vulnerable computers. It is not particular what specific method was used in your case, however, the intrusion may happen through the following channels:
- bundling with third-party programs, mainly free apps;
- spam e-mails from the unknown senders;
- websites offering free hosting;
- P2P (peer-to-peer) torrent software.
There are times when the Oohu ransomware might disguise itself as some real application, for example, through the misleading informs demanding setup of some software update. This is the most typical trick used by the frauds to inject the Oohu infection files into the system. In this manner users partially take part in its setup, without clearly understanding the risk.
Moreover, the frauds may send out unsolicited spam email with difficult notifies motivating individuals to open dubious attachments or click on some download links, for instance, those motivating individuals to open particular images, text files, tax documents and other info.
No doubt, opening these files or clicking on the harmful links might essentially harm the system. Fake Media Player upgrade alerts may result in the Oohu ransomware seepage. Likewise, downloading the split software application may additionally contain the ransomware installer. The last but not the least, installation of Oohu might take place through some Trojan horses that might be installed stealthily into the system and without the user’s direct approval or even authorization.
Avoiding the Oohu attack.
Naturally, there is no outright guarantee that your computer system will be always devoid of any malware attacks, however, we wish to share some beneficial suggestions with you to make it much safer. Make sure to pay very very close attention while browsing the web and especially while getting cost-free programs. Do not open any suspicious e-mail attachments, specifically if the sender is not understood to you.
Do not forget that particular freeware installer may also include some other extra apps in the bundle. These additional applications might be very damaging. It is of utmost importance to keep your anti-virus software application and your operating system in general to be constantly effectively updated.
It is rather logical that downloading pirated programs is unlawful, however, furthermore, such unapproved software application usage may also bring major damage to your computer. Hence, do not download any cracked programs. Plus, the fact that your current anti-virus did not protect the system from the Oohu ransomware is a great factor for you to reevaluate your options and change to another program that can render the securing functions on a far better level.
Below please find the quotation from the Oohu text file:
ATTENTION! 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: https://we.tl/t-2P5WrE5b9f 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: restorealldata@firemail.cc Reserve e-mail address to contact us: gorentos@bitmessage.ch Our Telegram account: @datarestore
Screenshot of files with “.oohu” extension added by the virus:”
Use GridinSoft Anti-Malware to remove Oohu ransomware from your computer
1.Download GridinSoft Anti-Malware.
You can get GridinSoft Anti-Malware by clicking the button below:
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.
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.
3. Press Install button for run GridinSoft Anti-Malware.
3.Once installed, GridinSoft Anti-Malware will automatically run.
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.
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.
Use Emsisoft Decryptor for restore oohu files
You can get Emsisoft Decryptor by clicking the button below:
- Run the decryptor as an administrator. The license terms will show up, which you have to agree to by clicking the “Yes” button.
- Once the license terms are accepted, the primary decryptor user interface opens.
- By default, the decryptor will pre-populate the locations to decrypt with the currently connected drives and network drives. Additional locations can be added using the Add” button.
- Decryptors typically offer various options depending on the particular malware family. The available options are located in the Options tab and can be enabled or disabled there. You can find a detailed list of the available Options below.
- After you have added all the locations you want to decrypt to the list, click the “Decrypt” button to start the decryption process. The screen will switch to a status view, informing you about the current process and decryption status of your files
- The decryptor will inform you once the decryption process is finished. If you require the report for your personal records, you can save it by clicking the “Save log” button. You can also copy it straight to your clipboard to paste it into emails or forum posts if you are asked to.
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