8/31/2023 0 Comments Djvu ransomwareDon’t make it easy for the crooks by leaving yourself open to attacks that you could have prevented. Get your patches and security updates as soon as you can.Don’t click through to unexpected web links or download software you didn’t ask for just because someone you don’t know told you to.Don’t open unexpected attachments, especially on the say-so of the email itself, which could have come from anybody and probably did.Ransomware isn’t only about attacks on big companies and corporate networks.Īt home, you can protect yourself with some simple precautions: …only to find out you’ve made a bad thing worse. We don’t know how this particular sample was distributed, or how many people have run it, but if you have been the victim of one ransomware attack already, please don’t let your guard down in your search for a free tool to recover… It did, however, scramble its own ransom note. On our test desktop, the malware tried but failed to encrypt our sacrificial files. We’re guessing that DJVU was targeted this time because early versions of that malware could be decrypted for free, but it seems that the DJVU crooks made some recent “improvements” to make it harder to unscramble without paying.Īs a result, we assume that at least some victims might now be willing to search outside their usual comfort zone for free tools that claim to help, given that the reputable ones they’ve already tried didn’t work.įor what it’s worth, the crab.exe scrambler didn’t seem very well programmed – in our tests it failed to scramble some files for reasons that could easily be avoided (we shan’t say why- we’ll leave the crooks to find the bug for themselves), and in some directories it managed to scramble its own -DECRYPT-ZORAB.txt ransom note shortly after creating it. djvu extension string that target this sample at DJVU victims. Note that by simply changing a few text strings in their malware and recompiling it, these crooks could easily turn it into a variant that claims to “fix” other ransomware strains – it’s just the window title and the. There’s no price shown here, no web page to visit, and no cryptocoin wallet to send any funds to, just a “personal ID” and a pseudo-anonymous ProtonMail email address that supposedly puts you in touch with the crooks. djvu.ZRBĪfter the scrambling finishes, your Windows wallpaper is set to a black background for dramatic effect, and a file called -DECRYPT-ZORAB.txt is added to your desktop to tell you what to do next: ZRB, so doubly-encrypted files will now end. …you’ll end up in a double-whammy situation, with any files that DJVU didn’t yet attack scrambled once, and with any already-encrypted files now scrambled twice. So if you are running this in the desperate hope that you might be able to recover from one ransomware attack for free… djvu, added by the very ransomware that this double-crossing malware claims to be able to fix, is on the list. The crab.exe file is unreconstructed ransomware: it goes through your files looking for matches against a long list of file extensions to encrypt, and scrambles them with a randomly-chosen encryption key.
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