Arctic Wolf Labs Review of Joint Cybersecurity Advisory on Russian-Backed Snake Malware

### Executive Summary This report summarizes CISA and Arctic Wolf's analysis of the Russian FSB's Snake (Uroburos) malware — a sophisticated, modular, cross-platform espionage tool used for nearly 20 years to exfiltrate diplomatic and other sensitive data worldwide; it details the implant's kernel-mode driver, custom P2P command-and-control and transport protocols, an implementation flaw in Diffie-Hellman key handling, victimology, detection opportunities/IOCs, and the court-authorized Operation MEDUSA disruption using the FBI's PERSEUS tool.