Meanwhile, the antivirus modules that detect an obfuscated code ignore that file – considering that there is no obfuscation in that file.
They do such a trick using a unique repacking application that generates a completely new sample almost every minute. That makes the file hash, along with the file size and other attributes, completely different. It is a sort of obfuscation – but how graceful that is! Each new version of the Djvu ransomware has an entirely different code sequence. Most widespread by underlying methods – database-backed detection – has a design flaw that allows the crooks to make their malware invisible for antivirus engines. Such tactics allow them to catch each trend – and remain safe and sound! Repacking for Stealthiness:Īnti-malware programs have a lot of ways of malware detection.
Djvu ransomware torrent#
Knowing that there is a highly-demanded thing on torrents, they create a one-day site to spread the links to malicious torrent downloads. They somehow manage to target their email spam attacks on the users who await the delivery messages. Email spam, untrustworthy software, and hacked programs are not something new, but the way these crooks mask their stuff is amazing. Their affiliates master their tactics, and manage to find something new each month. The unique part of this ransomware group makes it even stronger. STOP/Djvu Ransomware Distribution Methods Unfortunately, even quantum computers cannot decrypt these ciphers fast enough – it will take thousands of years. That means there is no way to get it without paying the ransom. And there is no way to get the key – in 95% of cases, it is kept on the command server and sent with asymmetric encryption. Even AES-256 is enough to prevent any decryption with a brute force. Sometimes they combine them, but there is no need for such a strong cipher. Like most other ransomware families, STOP/Djvu uses AES-256 or RSA-1024 encryption methods. Key things that make Djvu virus so successful are the aforementioned spreading ways, and a unique repacking mechanism, that allows this malware to stay undetected for a long time. But the core of the ransomware they produce brings nothing that can give such a big spread. What is a STOP/Djvu Ransomware?īeing successful usually means having something unique in your product. The FBI is interested in capturing at least one of their top managers. 1 They will likely grow in the following years – and Djvu will be in touch. It is unclear how much these guys earn, but the gross losses from ransomware activity exceeded $11 billion in 2021. Such a “success” results from amazing cooperation with other malware creators and good awareness about all possible malware spreading ways. STOP/Djvu family has a share of almost 75% of all ransomware detections when we talk about individuals. Appearing in December 2017, it is one of the oldest ransomware families among the ones that are running these days. This malware type is infamous for its ability to lock the files and then ask you to pay a large sum of money to get them back. STOP/Djvu ransomware family is individuals’ most widespread ransomware family.
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