Though Chaos v4.0 had been in-the-wild for several months now, this variant of Chaos rose to notoriety in April 2022 when it was weaponized by a threat group called Onyx. In the 2017 movie adaptation (which is loosely based on the original works), Ryuk appears as the secondary antagonist. His role is a lot smaller than it was in the anime, manga and original live action adaptations; however, he is still a prominent figure within the film and appears slightly more evil than in previous adaptations. Ryuk is a well-known ransomware variant, and different versions have been reviewed in the past. However, due to its targeted and ever-evolving nature, it is interesting to see what the latest variants hold in store.

Chaos started as a relatively basic attempt at a .NET compiled ransomware that instead functioned as a file-destructor or wiper. Over time it has evolved to become a full-fledged ransomware, adding additional features and functionality with each iteration.Hermes ransomware, the predecessor to Ryuk, was first distributed in February 2017. Only one month after its release, a decryptor was written for Hermes, followed by the release of version 2.0 in April 2017, which fixed vulnerabilities in its cryptographic implementation. Since this release, the only way for a victim to recover files is with the private encryption key, which is obtained by paying the ransom. In late August 2017, Hermes version 2.1 was released. In Death Note: The Musical, Ryuk's role is very similar to canon, although he notably interacts more with Rem. Intangibility: Like all Shinigamis, Ryuk can pass through walls and matter, and can't be seen by human beings, except if they are in possession of a Death Note, or a fragment of it.

The Relight films are a condensed version of the anime series. The premise of the films is that Ryuk tells the story to a fellow Shinigami. You have lost, Light. Didn’t I say in the beginning, when you die, the one who’ll write your name down in a notebook will be me? That is the deal between the Shinigami and the first human to get their hands on the note in the human world. Once you enter prison, I don’t know when you’ll die. It’s annoying to wait. Your life is already over. You’ll die here. The Onyx group simply customized their ransom note and created a refined list of file extensions they wished to target. There is little other modification to differentiate it from any other samples built with Chaos v4.0.

Appendix D - Terminated Services

Compared to other families of ransomware, Ryuk has very few safeguards to ensure stability of the host by not encrypting system files. For example, many ransomware families contain extensive lists of file extensions or folder names that should not be encrypted (whitelisted), but Ryuk only whitelists three extensions: It will not encrypt files with the extensions exe , dll , or hrmlog . The last extension appears to be a debug log filename created by the original Hermes developer. It should be noted that absent from this list is sys (system drivers), ocx (OLE control extension) and other executable file types. Encrypting these files could make the host unstable. Early versions of Ryuk included the whitelisting of ini and lnk files, but these have been removed in recent builds. The following folder names are also whitelisted and not encrypted. It is interesting to see that there is yet another typo, this one is in the first command that prevents the command from running successfully (the letter ‘e’ is missing in the word “delete”).

https://medium.com/s2wblog/anatomy-of-chaos-ransomware-builder-and-its-origin-feat-open-source-hidden-tear-ransomware-ffd5937d005f The sfist describes Ryuk as the sole "(potential) cheeseball factor" of the first film and that he may be "difficult to get used to." The article stated that Ryuk "adds" to the film if the viewers "let go enough to accept Ryuk's presence." Execute the payload using the CreateRemoteThread API. (Note, that this API will fail for 64-bit processes, which is OK since the payload is 32-bit.) Lateral movement is continued until privileges are recovered to obtain access to a domain controller.Ryuk appears alongside Light as a non-playable story character for the crossover video game Jump Force. Live-action film series Main articles: Death Note, Death Note: The Last Name, L: Change the WorLd, and Death Note: Light Up the NEW World Sometime after Light's death and Ryuk's return to the Shinigami Realm, Ryuk becomes popular among other Shinigami due to his time spent in the Human World with Light. Eventually, Ryuk's story catches the attention of an unnamed Shinigami, who visits Ryuk to hear it. Despite not being the most cutting-edge, Ryuk is not be toyed with. General description of Ryuk Ransomware This version of Chaos encrypts victim files with AES-256, and then appends a key to the end of each file to signify they’ve been encrypted. This key is then used by the newly designed decryptor to decode the files, returning them to their original, unencrypted state.