Coba – Ransomware
Coba is a destructive software functioning as common ransomware. Michael Gillespie, the popular virus researcher, first discovered this new name in the DJVU ransomware family.
Coba was created for the sole purpose to encrypt all popular file types. Logically, as soon as the encryption is effectively accomplished, the users are unable to get access to them. Coba virus adds its own “.coba” to all the encrypted files. For example, the file “price_list.xls”, once crypted by Coba, will be titled as “price_list.xls.coba”. Once the encryption is accomplished, Coba puts its own special text document (_readme.txt) into all the folders that store the encrypted files.
The alert stated by _readme.txt requesting the random os really comparable to the notifications provided by other ransomware hazards coming from the DJVU family. The caution essentially indicates that the files have been encrypted and the only service to get access to it is to use an unique standalone key. Regretfully, this declaration is absolutely real.
The approach to secure the files utilized by Coba is not totally looked into. However, there is no doubt that each computer system owner might be provided a special decryption key, which is absolutely unique. It is exceptionally tough to recuperate the information without the appropriate key in place.
“Don’t worry, you can return all your files!”, from _readme.txt message:
One more peculiarity of the Coba infection is that the users are unable to get access to the key. The decrypting key is hosted on a special server under the complete control by the crooks who have actually launched the Coba ransomware into the world wide web. In order to acquire the key and restore the crucial information, the users are informed to contact the frauds by means of e-mail or by telegram and to pay the ransom in the amount of $980.
The message likewise says that individuals ought to call the Coba authors within 72 hours upon the moment of the data encryption. The alert suggests that by doing so individuals will obtain a 50% discount, for that reason, the ransom quantity falls to $490.
Coba modified your information, however, it might not be the only threat on your computer. Plus, the ransomware may be concealed deep in the system. To spot and delete the risk completely, we advise you to describe the aid of GridinSoft Anti-Malware .
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No matter what the amount of the ransom is, we strongly encourage that you do not pay the ransom. There is no assurance that these online crooks will keep their pledges, so they might not care at all what the victims feel about the encryption, even when the quantity of the ransom is received into their accounts. Thus, paying ransom frequently does not result in an effective healing. So, the users may just lose their money for nothing.
Likewise, we advise you not to call the frauds as they advise. Do not transfer cash into their wallets. There are no applications that might break the Coba virus or bring back the data for free. For that reason, the only right decision is to restore the information from possible backups (if available).
Virus Summary
| Name | Coba Ransomware |
| File Extension | coba |
| 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 .coba extension to all the files modified by it. |
| Distribution Method | Adware bundles and software cracks |
| Similar Infections | Lokas, Besub, Nusar |
| Coba Removal Tool | GridinSoft Anti-Malware |
| Coba Decryption Tool | Emsisoft Djvu Decryptor |
Do not forget that the Web is now full of infections comparable to the Coba ransomware. For instance, this specific risk is basically similar to Brusaf and other ransomware-type infections. These harmful utilities have actually been established in order to encrypt the crucial data and express the need for the users to pay the ransom. All these infections utilize the identical algorithm to generate the specific key for effective information decryption.
Unless the Coba ransomware is still under the development process or has actually got some concealed bugs, it is not possible to bring back the information by hand. Therefore, the only working option to prevent the loss of your essential information is to frequently keep up-to-date backups of all your essential documents.
Another crucial piece of guidance is to store the backups on unique storage not connected to your main device. For example, you might 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 routine drive is extremely dangerous, because the backup may also be encrypted by the Coba virus.
Leaks for the Coba ransomware attack.
Coba utilizes many paths to penetrate the susceptible computers. It is not particular what particular technique was used in your case, however, the intrusion may take place through the following channels:
- bundling with third-party programs, primarily free apps;
- spam e-mails from the unknown senders;
- websites offering free hosting;
- P2P (peer-to-peer) torrent downloads.
There are times when the Coba ransomware might disguise itself as some genuine application, for instance, through the misleading signals requiring setup of some software application update. This is the most common technique used by the scams to inject the Coba infection files into the system. In this manner users partly take part in its setup, without clearly comprehending the danger.
Furthermore, the scams might send out unsolicited spam email with challenging alerts encouraging the people to open dubious accessories or click some download links, for example, those encouraging the people to open particular images, text files, tax files and other information.
No doubt, opening these files or clicking on the destructive links might basically harm the system. Fake Media Player update notices may lead to the Coba ransomware seepage. Likewise, downloading the split software might additionally consist of the ransomware installer. The last however not the least, installation of Coba might happen through some Trojan horses that may be set up stealthily into the system and without the user’s direct authorization or perhaps authorization.
Avoiding the Coba injection.
Obviously, there is no outright assurance that your computer system will be constantly without any malware attacks, however, we would like to share some beneficial tips with you to make it much safer. Ensure to pay very very close attention while browsing the web and especially while getting cost-free programs. Do not open any dubious e-mail accessories, specifically if the sender is not known to you.
Do not forget that particular freeware installer might likewise include some other additional apps in the bundle. These extra applications may be extremely harmful. It is of utmost significance to keep your anti-virus software application and your os in general to be constantly properly updated.
It is rather rational that downloading pirated software is unlawful, however, additionally, such unauthorized software usage may also bring major damage to your PC. For this reason, do not download any split programs. Plus, the fact that your existing anti-virus did not safeguard the system from the Coba ransomware is a good 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 Coba 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 “.coba” extension added by the virus:”
Use GridinSoft Anti-Malware to remove Coba 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 coba 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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