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These issues have since been resolved.We believe Ryuk is infecting systems using Emotet and TrickBot to distribute the ransomware. If the target has a large enough infection spread of Emotet/TrickBot, and/or if its operations are critical or valuable enough that disruption would trigger an inclination to pay the ransom, then that might make them the perfect target for a Ryuk infection.The true intention for using this malware can only be speculated at this point.
While this chart only shows us August onward, rest assured that for much of the year, Emotet was on the map. Now press and hold Shift, which is on your keyboard, and click... Now select Troubleshoot → Advanced options → Startup Settings and finally press Restart. For example, both Ryuk and Hermes whitelist a folder named “Ahnlab”, which is the name of a popular South Korean security software.If you know your malware, you might remember that Hermes was attributed to the Lazarus group, who are associated with suspected North Korean nation-state operations.
It has its own abilities to spread laterally throughout the network, as well as launch its own From there, the most common payload that we have seen Both TrickBot and Emotet have been used as information stealers, downloaders, and even worms based on their most recent functionality.At some point, for reasons we will explore later in this post, TrickBot will download and drop Ryuk ransomware on the system, assuming that the infected network is something that the attackers want to ransom. This has led many analysts and journalists to speculate that North Korea was behind this attack.Multiple notable Ryuk attacks have occurred over the last few months primarily in the United States, in which the ransomware infected large numbers of endpoints and demanded higher ransoms than what we typically see (15 to 50 Bitcoins).According to Checkpoint and multiple other analysts and researchers, Ryuk is spread as a secondary payload through botnets, such as Here is the running theory: Emotet makes the initial infection on the endpoint. However, as we sailed into Q4 2018, it became a much bigger problem.The orange line represents TrickBot. Once Ryuk ransomware gets into a network, it automatically spreads from node to node, PC to PC, encrypting significant files along the way with an unbreakable code.
To ensure that you don’t lose your mapped or networked drives and resources if a single endpoint gets infected, it’s a good idea to There are two ways to segment your network and reduce the damage from a ransomware attack.
This is a means to identify if the file or system has already been attacked and/or encrypted.The other case involves whitelisted folders, and while not as damning as the first, the fact that both ransomware families whitelist certain folder names is another clue that the two families might share originators.
And how can businesses stop it and similar threats in the future?One interesting aspect of this ransomware is that it drops more than one note on the system.
In recent months, Ryuk binaries have continued to deviate further and further from the original Hermes source code, with the threat actors adding and removing functionality often. You would need to either have unpatched endpoints or weak credentials for TrickBot and Emotet to move laterally throughout the network and then, finally, you would need to be a target.That being said, while our detections of Ryuk are small compared to the other families on this chart, that’s likely because we caught the infection during an earlier stage of the attack, and the circumstances for a Ryuk attack need to be just right—like Goldilocks’ porridge. It’s up to businesses and security professionals to stay on top of emerging threats, however minor they may appear, as they often signal a change in the shape of things to come.
First, restrict access to certain mapped drives based on role requirements.