Death Note Anime Ryuk Figurine

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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. It’s not often that we get to observe the behind-the-scenes drama that can accompany the creation of new malware, but when we do, it gives us a fascinating glimpse into how threat actors operate. One such glimpse, stemming from an online exchange between a ransomware perpetrator and a victim, gave us new insights into the origins of Chaos malware, revealing a twisted family tree that links it to both Onyx and Yashma ransomware variants. If the time stamps are correct, the two executables ( bitsran.exe and RSW7B37.tmp ) were compiled within four hours and three minutes of each other. Due to the short time frame of Hermes being bundled within an executable that was hard-coded with credentials of the FEIB network, Falcon Intelligence assesses that STARDUST CHOLLIMA likely had access to the Hermes source code, or a third party compiled and built a new version for them. Unlike other variants of Hermes, RSW7B37.tmp does not append the exported and encrypted AES key to the end of the file. Figure 5 is a file encrypted by Hermes with the exported AES key appended to the end of the file as a footer.

It was good while it lasted. We eased each other's boredom for quite a while. Well, Light, it's been interesting.The next steps taken by the injected payload are the same steps taken by the initial Ryuk ransomware invocation. Process and Service Termination Despite not being the most cutting-edge, Ryuk is not be toyed with. General description of Ryuk Ransomware

Reconnaissance of the network is conducted using standard Windows command line tools along with external uploaded tools. Falcon Intelligence has medium-high confidence that the WIZARD SPIDER threat actors are operating out of Russia. Hermes was originally advertised on exploit[.]in . This Russian-speaking forum is a well-known marketplace for selling malware and related services to criminal threat actors. If Hermes was indeed related to STARDUST CHOLLIMA, it would imply that nation-state threat actors are selling their services on Russian-speaking forums, which is unlikely. Unlike other families of ransomware, Ryuk does not contain process/service termination and anti-recovery functionality embedded in the executable. In the past, Ryuk did contain these capabilities, but they have been removed and are contained within two batch files. Lateral movement is continued until privileges are recovered to obtain access to a domain controller. Ryuk is briefly seen in the third episode of the miniseries Death Note: New Generation. He apparently delivers a notebook directly to Kira-worshiper Yuki Shien, who begins acting as a new Kira. The episode ends with Ryuk laughing and saying, "Interesting."

Introduction of Ryuk

A Cruel Dream Reprise is a song Ryuk and Rem sing as Rem becomes more emotionally attached to Misa.

Also, during forensic investigation of a network compromised by WIZARD SPIDER, CrowdStrike Services recovered artifacts with filenames in Russian. One file was named !!! files dlya raboty !!!.rar , which translates to “files for work.” Based on these factors, there is considerably more evidence supporting the hypothesis that the WIZARD SPIDER threat actors are Russian speakers and not North Korean. How CrowdStrike Can Prevent Ryuk 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.

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The first executable, bitsran.exe , is a dropper, and RSW7B37.tmp is the Hermes ransomware executable. The dropper’s goal is to propagate the Hermes executable within a network by creating scheduled tasks over SMB sessions using hard-coded credentials. The Hermes executable then encrypts files on the host. It is interesting to note that the compiler and linker for Hermes is different from the other executables. All of the executables except for Hermes were compiled with Visual Studio 10, with a linker of Visual Studio 10. Hermes, in contrast, was compiled with Visual Studio 9, with an unknown linker. Five days later, Ryuk has a conversation with Light. The simple reason he gives about why he dropped the Death Note into the human world is that because he is bored. He then tells Light that, since he was the one who found the notebook, it belongs to him. If he does not need it anymore, he can pass it to anyone else. But when it is the time for Light to die, Ryuk will write his name down. Light then explains to Ryuk that he wishes to cleanse the world of evil criminals, and becomes the God of the new world. Ryuk tells Light that, if he were to do that, the only bad person left would be Light himself. Light ignores his comment, maintaining that he is entirely sincere. Ryuk then comments that humans are interesting. Current builds of Ryuk no longer contain persistence functionality. Previously, to remain persistent on the host, Ryuk created a registry entry under the Run key using Windows cmd.exe shell. The following command line was used to write to the Registry Run Key name svchos to HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run with the value being the path to the Ryuk executable. Process Injection It is not exactly obvious who stands behind this Ransomware. Some evidence and code similarities to another Ransomware called Hermes point towards a North Korean APT, Lazarus Group. However, this is not hard evidence, considering that a sample of Hermes could have fallen into the hands of another criminal and serve as a base for Ryuk's development. This initial edition of Chaos overwrites the targeted file with a randomized Base64 string, rather than truly encrypting the file. Because the original contents of the files are lost during this process (seen in Figure 4), recovery is not possible, thus making Chaos a wiper rather than true ransomware.

cmd.exe /C REG ADD “HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run“ /v "svchos" /t REG_SZ /d "\" /f There are two types of Ryuk binaries: a dropper (which is not commonly observed) and the Ryuk executable payload. Recovery of Ryuk droppers are rare, due to the Ryuk executable payload deleting the dropper when executed. Upon execution, the dropper constructs an installation folder path. The folder path is created by calling GetWindowsDirectoryW and then inserting a null byte at the fourth character of the path. This is used to create a string that contains the drive letter path. If the host operating system is Windows XP or earlier, the string Documents and Settings\Default User\ is appended to the drive letter path. If the host is Windows Vista or newer, the string users\Public\ is appended to the drive letter path. For Windows XP, an example folder path would be C:\Documents and Settings\Default User\ , and for Window Vista or higher, the path would be C:\Users\Public . The malware can now also stop various services on the victim device. Based on our analysis of Yashma samples taken from the wild, these are the services we’ve seen the updated malware target: As a passionate anime lover myself, with Death Note ranking among my all-time favorite series, I have had the pleasure of owning the SFC Figurine of Ryuk for some time now. Standing at an impressive 30 cm tall, this figurine not only captures the essence of Ryuk's character from Death Note but also satisfies the discerning tastes of dedicated anime enthusiasts like myself. Chaos (and subsequently Yashma) have seen rapid development and advances throughout the last year, with its most recent iteration, “Yashma” (Chaos v6.0), found in-the-wild in mid-2022.

4. Ryuk Functionality: A Technical Analysis

Ryûk is particularly curious and hates to be bored, which often leads him to visit humans and drop his Death Note to find some entertainment. He's also a fairly insightful Death god is very prankish. Tom S. Pepirium of IGN said that "Brian Drummond IS Ryuk." Pepirium described Drummond's voice as "excellent" and that this makes it "hilarious" to watch "Ryuk and his never-ending grin giggle at the events he put into motion." Variants of Chaos have been seen in-the-wild for a year now, and are likely used by multiple threat actors. When designing Ryuk's Death Note, Obata thought about the appearance of Ryuk's handwriting. Ryuk wrote the words "Death Note" on the cover of his own notebook, and when he took possession of Sidoh's book he wrote the same words on the front cover.