In other cases, computer infections are caused via links and attachments sent by cybercriminals via email, files and programs downloaded from unreliable sources, and fake updaters. In most cases, users infect computers with Djvu ransomware via files downloaded from deceptive pages offering to download videos from YouTube or fake installers for cracked/pirated software.

How did ransomware infect my computer?Ĭybercriminals aim to trick users into executing ransomware by themselves. More ransomware examples are Skynet, blueKey, and NMO. Thus, it is useful to have a data backup stored on a remote server or unplugged storage device to avoid data loss (or paying for its recovery) in case of a ransomware attack. In most cases, it is not possible to decrypt files for free. Ransomware in generalĬybercriminals behind ransomware attacks demand to pay a ransom in return for a decryption tool. It can be prevented by eliminating ransomware as soon as possible. Paying a ransom is never recommended - there is a high chance that the attackers will not provide a decryption tool.Īlso, ransomware can cause further encryptions: it can encrypt more files on the infected computers and infect other computers connected to a local network. Typically, free data recovery is impossible unless victims have a copy of files (data backup) or a working third-party decryption tool (if one is available on the Internet). The ransom note provides two email addresses for contacting the attackers: and It mentions that victims can send one encrypted file before paying a ransom, and the attackers will decrypt it for free. The price of decryption tools ($980 or $980) depends on whether victims will contact the attackers within or after 72 hours. Screenshot of files encrypted by this ransomware:Īs written in the ransom note, files (pictures, databases, documents, etc.) encrypted by Oori ransomware cannot be decrypted without a decryption tool and a unique key. Also, it drops the ' _readme.txt' file on the desktop (this file contains a ransom note).Īn example of how files encrypted by Oori ransomware are renamed: ' 1.jpg' is renamed to ' 1.jpg.oori', ' 2.png' to ' 2.png.oori', ' 3.exe' to ' 3.exe.oori', and so forth. We found that Oori encrypts files and appends its extension ('. Our malware researchers discovered Oori while examining samples submitted to VirusTotal. Oori is ransomware that belongs to the Djvu ransomware family.

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