Attackers compromised up to 1500 companies during massive ransomware attack, which is now reported as one of the largest cyber attacks ever. Victims have been infected with REvil ransomware, which is similar to DarkSide ransomware used recently in Colonial Pipeline attack. However, this time, the deployed REvil ransomware was more obfuscated than versions observed in beginning of 2021. In this article, we will discuss the obfuscation techniques used by REvil in Kaseya incident.

DarkSide Ransomware is a very hot topic now, especially after the Compromise of Colonial Pipeline networks, which has been investigated by FBI, too. It caused so serious problems that even hackers said that they “didn’t mean to create problems”. However, DarkSide ransomware is not something completely new, and it is similar to the infamous Revil/Sodinokibi ransomware. In this post, I would like to highlight some significant similarities between newer samples of both ransomwares with insights about DarkSide victims based on custom ransom notes.