![]() A ransom should not be paid - the attackers may not send a decryption tool even after the payment. Victims can avoid paying a ransom if they have their files backed up or a free decryption tool is available on the Internet. Typically, files encrypted by ransomware cannot be decrypted without a tool (program, key) that only the attackers can provide. Victims are offered to receive that file decrypted for free. Instructions on how to purchase decryption tools will be provided after contacting the attackers via or Before paying a ransom, victims can send one file that does not contain valuable data and is no larger than one megabyte. Decryption tools cost $980 (but can be purchased for $490 if victims contact the attackers within 72 hours from the attack). ![]() The "_readme.txt" file is created to inform victims that all their files are encrypted with the strongest encryption algorithm and cannot be decrypted without the right decryption tool and unique key. ![]() Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data: Koom is part of the Djvu ransomware family. koom" extension to filenames (for example, it changes a file named " 1.jpg" to " 1.jpg.koom", " 2.jpg" to " 2.jpg.koom"), and creates a ransom note (the " _readme.txt" file). Koom encrypts files so that victims could not access them without a decryption tool purchased from the attackers.
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