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These attachments are usually Microsoft Office documents, JavaScript files, PDF documents, archive files such as ZIP, RAR, executables, and so on. Computers are infected through emails when cyber criminals successfully trick people into opening files that are attached. You are advised to make regular backups and store them on a remote server or unplugged storage device.Ĭommon ways to proliferate ransomware and other malware are through emails, fake software updating tools, untrustworthy file download sources, trojans, and unofficial software activation tools. Alternatively, a backup can be used if created before encryption. In rare cases, this can be avoided if the ransomware contains bugs/flaws and the encryption can be 'cracked'. Many people are tempted to contact cyber criminals, since only they have the tools able to decode the files. infected. Typically, they encrypt data and are used to extort money from people who have their computers infected with them.Ĭommon differences between these programs are cost of decryption tool/key and cryptographic algorithm ( symmetric or asymmetric) that was used to lock the data. There are many ransomware-type programs online. Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data: Another way to recover files is to restore them from a backup. This is possible only if there was no internet connection during the encryption process or the server used by cyber criminals was not responding. Typically, ransomware-type programs perform strong encryptions that cannot be decrypted without the correct tool/key, which can only be obtained by contacting (and paying) the cyber criminals who designed the ransomware.įortunately, ransomware that belongs to the Djvu family can sometimes be decrypted with a free decryption tool.
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Nvetud developers also offer free decryption of one file - users simply send one of the encrypted files. In any case, they must provide a personal ID, which is assigned to every victim. To contact these cyber criminals, victims must send an email to or or send a message via Telegram account). Typically, cyber criminals ask to be paid in a cryptocurrency. It is mentioned that this is the only way to regain access to locked files. Victims can receive a 50% discount (purchase the decryption tool for $490) if they contact cyber criminals within 72 hours of encryption. The ransom message states that the only way to recover files is to buy a decryption tool, which costs $980. It also changes the extension of each encrypted file by adding ". Nvetud creates a text file named " _readme.txt".
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Ransomware-type programs encrypt files and create (or display) ransom messages that contain instructions about how to pay the ransom or buy a decryption tool. Discovered by Michael Gillespie, Nvetud is software that belongs to the Djvu ransomware family.