What is Prus ransomware? And how does it execute its attack?
Prus ransomware is a crypto-virus discovered lately that can leave files inaccessible after it encrypts them. It seems to be targeting Russian-speaking users as some parts of its ransom note is written in Russian. It uses a “.prus” extension in marking the files it encrypt. Once it starts to execute its attack, it drops its payload file in the system and initiates a sequence of malicious activities with the purpose of plaguing essential system settings and processes. It downloads other malicious components and places them to system folders. It then modifies the registry keys and sub-keys like Run and RunOnce in the Windows Registry to allow the automatic execution of the attack every time a user turns on the infected computer which makes its attack persistent. It also employs data gathering and stealth protection modules in order to collect sensitive information in the system and to evade security and antivirus programs.
After system modification, Prus ransomware will start to encrypt its targeted files. It mostly target user-generated files like documents, images, database, audio files, videos, and so on. Once the encryption is completed, it adds the “.prus” suffix to every compromised file indicating that the file is locked. It then drops a text file named “informprus.txt”. Here are some parts of its ransom note written in English:
We are realy sorry to inform you that ALL YOUR FILES WERE ENCRYPTED
by our automatic software. It became possible because of bad server security.
Please don’t worry, we can help you to RESTORE your server to original
state and decrypt all your files quickly and safely!
Files are not broken!!!
Files were encrypted with AES-128+RSA-2048 crypto algorithms.
There is no way to decrypt your files without unique decryption key and special software. Your unique decryption key is securely stored on our server. For our safety, all information about your server and your decryption key will be automaticaly DELETED AFTER 7 DAYS! You will irrevocably lose all your data!
* Please note that all the attempts to recover your files by yourself or using third party tools will result only in irrevocable loss of your data!
* Please note that you can recover files only with your unique decryption key, which stored on our side. If you will use the help of third parties, you will only add a middleman.
HOW TO RECOVER FILES???
Please write us to the e-mail (write on English or use professional translator):
1 email: [email protected] (Response time within 24 hours)
2 email: [email protected] (replacement mail in the event that no reply in 24 hours by email 1)
You have to send your message on each of our 3 emails due to the fact that the message may not reach their intended recipient for a variety of reasons!
We recommed you to attach 3 encrypted files to your message. We will demonstrate that we can recover your files.
* Please note that files must not contain any valuable information and their total size must be less than 5Mb.
Please be sure that we will find common languge. We will restore all the data and give you recommedations how to configure the protection of your server.
Recovery time from 30 minutes to 10 hours, including local drives and connected devices.
We will definitely reach an agreement 😉 !!!”
How does Prus ransomware spread online?
Wipe out Prus ransomware by using the removal guide provided below.
Step 1: First, tap the Ctrl + Shift + Esc keys in your keyboard to open the Task Manager.
Step 2: Under the Task Manager, go to the Processes tab and look for any suspicious-looking process that takes up most of your CPU’s resources and is most likely related to Prus ransomware.
Step 3: After that, close the Task Manager.
Step 4: Tap Win + R, type in appwiz.cpl and click OK or tap Enter to open Programs and Features under Control Panel.
Step 5: Under the list of installed programs, look for Prus ransomware or anything similar and then uninstall it.
Step 6: Next, close Control Panel and tap Win + E keys to launch File Explorer.
Step 7: Navigate to the following locations below and look for Prus ransomware’s malicious components such as informprus.txt and [random].exe and other suspicious files, then delete all of them.
Step 8: Close the File Explorer.
Before you proceed to the next steps below, make sure that you are tech savvy enough to the point where you know exactly how to use and navigate your computer’s Registry. Keep in mind that any changes you make will highly impact your computer. To save you the trouble and time, you can just use [product-name], this system tool is proven to be safe and excellent enough that hackers won’t be able to hack into it. But if you can manage Windows Registry well, then by all means go on to the next steps.
Step 9: Tap Win + R to open Run and then type in regedit in the field and tap enter to pull up Windows Registry.
Step 10: Navigate to the following path:
- HKEY_CURRENT_USER\Control Panel\Desktop\
- HKEY_USERS\.DEFAULT\Control Panel\Desktop\
Step 11: Delete the registry keys and sub-keys created by Prus ransomware.
Step 12: Close the Registry Editor and empty the Recycle Bin.
Try to recover your encrypted files using the Shadow Volume copies
Restoring your encrypted files using Windows’ Previous Versions feature will only be effective if Prus ransomware hasn’t deleted the shadow copies of your files. But still, this is one of the best and free methods there is, so it’s definitely worth a shot.
To restore the encrypted file, right-click on it and select Properties, a new window will pop-up, then proceed to Previous Versions. It will load the file’s previous version before it was modified. After it loads, select any of the previous versions displayed on the list like the one in the illustration below. And then click the Restore button.
Complete the removal process of Prus ransomware by using a trusted and reliable program like [product-name]. Refer to the following guidelines on how to use it.
Perform a full system scan using [product-code]. To do so, follow these steps:
- Turn on your computer. If it’s already on, you have to reboot it.
- After that, the BIOS screen will be displayed, but if Windows pops up instead, reboot your computer and try again. Once you’re on the BIOS screen, repeat pressing F8, by doing so the Advanced Option shows up.
- To navigate the Advanced Option use the arrow keys and select Safe Mode with Networking then hit
- Windows will now load the Safe Mode with Networking.
- Press and hold both R key and Windows key.
- If done correctly, the Windows Run Box will show up.
- Type in the URL address, [product-url] in the Run dialog box and then tap Enter or click OK.
- After that, it will download the program. Wait for the download to finish and then open the launcher to install the program.
- Once the installation process is completed, run [product-code] to perform a full system scan.
- After the scan is completed click the “Fix, Clean & Optimize Now” button.