OOPU Ransomware. How to decrypt .oopu files?

If you cannot open your pics, documents, or data and see the .oopu extension on them, your computer is surely infected with Oopu ransomware. It pertains to STOP/Djvu ransomware family

Oopu ransomware encrypts personal documents found on the victim’s computer with the extension “.oopu” and after that leaves the ransom note in each folder which contains encrypted files. The instructions are put on the victim’s PC in the “readme.txt” file. Its activity is generally similar to other representatives of the same ransomware family: Xbtl, Qqpp, Qqkk.

What is Oopu Ransomware?

NameOopu Virus
Ransomware family1DJVU/STOP2 ransomware
Ransomware note_readme.txt
RansomFrom $490 to $980
Contactmanager@mailtemp.ch, helprestoremanager@airmail.cc
SymptomsThe images, videos, and other documents have the “.oopu” extension and cannot be opened by any programs
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Oopu is file-encrypting ransomware that prevents access to your text files, Excel tables, videos and photos by encrypting them. It marks the ciphered files with the “.oopu” extension. Then Oopu ransomware adds a money ransom note (readme.txt) to each folder. In this note, you can see the instructions to pay the ransom ($490-$980 in Bitcoin) to a certain Bitcoin address. The AES-256 or RSA-1028 cipher it utilizes to encrypt the documents is not decryptable with modern computers. Even quantum PCs that already exist will likely spend hundreds of years to brute force the decryption key.

How dangerous is the Oopu ransomware?

When Oopu ransomware gets in your system, it will examine your computer for photos, videos, and also important documents. It [ciphers all widespread file formats- .psd, .doc, .docx, .xls, .xlsx, .pdf, .jpeg, .png, et cetera. When these documents are found, the ransomware will encrypt them and change their extension to “.oopu” to ensure that you understand what happened.

After the Oopu ransomware encrypted the data on your computer, it will generate the last “readme.txt” file on the desktop. In addition to the ransom transactioning instructions, the victims also see the emails to contact the crooks – helprestoremanager@airmail.cc and manager@mailtemp.ch.

Here is the ransom note that the Oopu ransomware shows to its victims:


Don't worry, you can return all your files!
All your files like pictures, 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:

How did the Oopu ransomware get on my computer?

The Oopu ransomware spreads by placing links to get hacked programs or games. They keep their eye on all buzz topics which can be used to spread ransomware. New games releases, new popular movies – Oopu creators make everything to get their money on that. Some of the most preferred techniques these criminals use is one-day sites with torrent downloading links. Nonetheless, following the current trends is not the only manner these crooks utilize. Methods that have already become classic, such as email spamming, are likewise ordinary for STOP/Djvu ransomware distribution.

Malicious email spam
The example of email spamming that may lead to Oopu ransomware injection

Avoiding this ransomware does not require a lot of initiative. Using the ordinary rules of computer hygiene will significantly minimize all hazards. Keep in mind that opening all files you get on email is not a great tactic. Even worse situation is to enable macros in Microsoft Office documents. But it is much better to prevent the malware attack at the moment when you have only opened the email message. Inspecting the sender’s address can point out a lot about what you can anticipate, as well as when you see things like “support@amazon.com”– it is likely a genuine e-mail. Meanwhile, stuff that tries to appear like Amazon or FedEx shipping alert, however, uses the email address of “amazonspurrot1363@gmail.com”– need to make you be on the alarm. Above, you can see the illustration of such a message.

Outlaw sources of various digital things require some additional explanation. Going against copyright policy surely exposes you to the danger of being fined. Nonetheless, utilizing torrent trackers or third-party sites to download “free” programs likewise exposes you to different malware. Nobody can oversee anonymous individuals that launch the torrent seeding or release the hacked program version on the website with pirated program.

Oopu virus removal instructions.

Download Trojan Killer Portable

Trojan Killer Portable Download

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This guide below shows how to use Trojan Killer Portable3 for Oopu virus detection and removal:

  • STEP 1. Download and install Trojan Killer.

  • STEP 2. Click on "Finish".

  • STEP 3. Wait until necessary updates are downloaded and installed.

  • STEP 4. Select computer scan type.

  • STEP 5. The software will begin scanning your computer.

  • STEP 6. Click on "Cure PC".

Restore the files encrypted by the Oopu ransomware

In most cases, it’s impossible to recover the files encrypted by the Oopu ransomware because the private key needed to unlock the encrypted files is only available through cybercriminals. However, we’ve listed one option you can use to recover your files below.

Warning! Make sure you remove the ransomware from your system first, otherwise, it will repeatedly encrypt your files.

If your files were encrypted with an offline key, there is a chance you can recover them by using Emsisoft Decryptor for the STOP/Djvu decryption tool. Follow the below guide to recover your files using the Emsisoft Decryptor for STOP/Djvu.

  1. You can download Emsisoft Decryptor for STOP Djvu by clicking this link.
  2. When the decryptor has finished downloading, double-click on “decrypt_STOPDjvu.exe” to run this program on your computer.
  3. Click the “Decrypt” button to start the decryption process for Oopu files. The screen will switch to a status view, informing you about your files’ current process and decryption status.
  4. The decryptor will inform you once the decryption process will be finished. If you require the report for your records, you can save it by clicking the “Save log” button.

If the Emsisoft Decryptor can’t decrypt your .oopu files and you do not plan on paying the ransom, it is advised that you make an image of the encrypted drives so that you can decrypt them in the future.

Your computer should now be free of the Oopu ransomware infection. However, suppose your current antivirus allowed this malicious program on your computer. In that case, you might want to consider purchasing the full-featured version of Trojan Killer to protect against these types of threats in the future.

OOPU Ransomware — How To Remove Virus & Decrypt Files?

Name: OOPU Virus

Description: OOPU Virus is a STOP/DJVU family of ransomware-type virus. It encrypts files, video, photos, documents. Encrypted files can be tracked by a specific oopu extension. OOPU ransomware asks victims for a ransom fee about $490 - $980 in Bitcoin.

Offer price: 480

Currency: $

Operating System: Windows

Application Category: Virus

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  1. My files are encrypted by ransomware, what should I do now?
  2. About DJVU (STOP) Ransomware: https://gridinsoft.com/ransomware/djvu
  3. More about Trojan Killer: https://gridinsoft.com/trojankiller

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About William Reddy

I am from Ireland. My parents bought me a computer when I was 11, and several months after I have got a virus on this PC. I decided to enter the INSA Centre Val de Loire university after being graduated from the school. This French educational institution was offering a brand-new cybersecurity course. After getting the master's degree in cybersecurity, I've started working as a virus analyst in a little anti-malware vendor.