Usr0@riseup.net is the e-mail address associated with a very dangerous crypto virus that aims to extort users for 1.24 BTC (or 50500 RU), holding their files hostage. The ransomware virus uses the .usr0 file extension to add to the files of encrypted computers which can no longer be accessed after encryption. To notify the users, the virus drops it’s own distinctive ransom note, named “Важная информация.txt” suggesting it is primarily focused on targeting Russian speakers. The text file has instructions to contact the e-mail address and not to tamper with the encrypted files. It is recommended that you to read the following article to become familiar with this crypto-virus, remove it and try alternative methods to restore your files while malware researchers discover free decryption possibility.
|Short Description||The ransomware encrypts files with a very strong encryption algorithm and asks a ransom for decryption.|
|Symptoms||Files are encrypted with the .usr0 file extension added and can no longer be opened. A ransom note with instructions for paying the ransom shows as a “Важная информация.txt” file.|
|Distribution Method||Spam Emails, Email Attachments, File Sharing Networks.|
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|User Experience||Join our forum to Discuss Usr0 Ransomware.|
Usr0 Ransomware – How Does It Replicate
To cause massive file infections, this ransomware virus may spread in multiple different techniques. One of them and the most often met may be via malicious web links or URLs that are spammed in e-mail messages, that pretend to be your Linked in notification mail, invoice confirmation letters from services, such as PayPal and others.
Another technique of spreading the Usr0 ransomware is to replicate it by utilizing spam bots or Facebook malware over social media sites. Such techniques are very advanced and take some time to prepare, but they are also extremely effective.
Usr0 Ransomware – More Information About It
This particular type of ransomware infection may contain a set of tools, like file joiners, obfuscators, otherwise known as cryptors and even an Exploit Kit. These are all tools that may assist the primary executable of the Usr0 which encrypts files to be downloaded onto the targeted computer while remaining unnoticed.
Once it has been downloaded, the file may be located on the following Windows locations:
After the download the ransomware may automatically execute and begin encrypting user files. The Usr0 ransomware may begin to look for a wide variety of file types associated with video, audio, images and other often used files. It may target file extensions such as the following:
After encryption, the Usr0 virus may also delete the shadow copies and any other file history backups with commands such as the vssadmin command in administrative and quiet mode, without the user noticing:
Not only this, but the Usr0 malware also drops it’s distinctive ransom note, named Важная информация.txt which contains the following message:
RUsr0 Ransomware – Removal, File Decryption, and Restoring
Before attempting to restore the files encoded by the Usr0 ransomware, it is very important to remove the virus. To effectively remove Usr0 ransomware you may want to follow the deletion instructions after this article. However, we strongly advise using and advanced anti-malware tool if you cannot remove it using the manual instructions. It will make sure the Usr0 virus is gone at a click of a button, and your system should be protected in the future against other ransomware viruses as well.
The files that have been encrypted by Usr0 ransomware can no longer be opened by any software, and they may appear like the picture below:
In the ransom note, the cyber-criminals warn that the files may break if the user uses a different algorithm besides the original one. This is a strong indicator that besides a strong encryption algorithm, the files may have also been ciphered in a CBC (Cipher Block Chaining) mode which essentially may break them if you try to modify their structure in a way. This is why, while we research further this malware we advise you to try and restore the files using alternative techniques that do not tamper the files, like the ones in step “2. Restore files encrypted by Usr0” below. They may not be 100% effective, but they guarantee for the effective removal of the crypto-virus.
Manually delete Usr0 from your computer
Note! Substantial notification about the Usr0 threat: Manual removal of Usr0 requires interference with system files and registries. Thus, it can cause damage to your PC. Even if your computer skills are not at a professional level, don’t worry. You can do the removal yourself just in 5 minutes, using a malware removal tool.