This is because, in the wild, RYUK uses a dropper such as Trickbot or Emotet to disable AV, maintain persistence, steal Chrome & IE Passwords, distribute Ryuk ransomware executable files via Group Policy, and PSEXEC. To understand RYUK, you really need a deep understanding of Trickbot (There are two great posts analyzing the behavior ( here) and ( here). My first impression was – this is incredibly complicated.

Download RYUK_MDATPAnalysis.csv file ( here)ĭownload Trickbot_MDATPAnalysis.csv file ( here).I’ve uploaded the reports for download here: The MDATP evaluation lab recorded every process, registry change, file creation and network communication. It was helpful to detonate these two samples separately because it can be confusing to know when one starts and the other ends. I also obtained a copy of Trickbot for analysis from this website ( here). I obtained a copy of RYUK from an infected customer and then used the MDATP Evaluation Lab to examine RYUK behavior. According to Coveware, the average RYUK ransom payment is $300,000 USD, and RYUK has earned an estimated 4 million dollars in the last 90 days. Many of the organizations that have been hit with RYUK did not ‘threat model’ against APT groups, and it’s a rather unfair fight – like an NFL team beating up on your local high school football team, or a military using laser weapons against a civilian population using pitch forks. Just do a search for RYUK in the news for the last 30 days and you’ll find dozens of victims including 110 nursing homes, 400 hospitals, several state and local government – it’s a major crisis. Internationally, the Mexican state-owned petroleum company Pemex was recently infected by RYUK, along with businesses in Spain and around the world. In the last 90 days, RYUK has been detected in 14 States across the USA and has been labeled the “Threat of the Quarter” by Center of Internet Security. There have already been many professional write-ups on RYUK, including FireEye, CrowdStrike, Malwarebytes, Cyberreason, and CheckPoint. This blog post is an informal analysis of RYUK ransomware (MITRE T1486) and Trickbot.

Controlled folder access intune