⚠️ Overview

Snake, also tracked as Uroburos and Turla, is a sophisticated, modular cyber-espionage platform attributed to the Russian Federal Security Service (FSB) and operated by the threat group Turla (aka Venomous Bear, Secret Blizzard). First discovered in 2014 by BAE Systems and later analyzed by G DATA, Snake is a peer-to-peer (P2P) implant designed for long-term intelligence gathering, classified as a RAT and stealthy backdoor. It has been deployed against government, military, and diplomatic targets across over 50 countries, primarily in NATO and former Soviet states.

🔧 Technical Capabilities

Snake communicates via a custom encrypted P2P protocol using TCP or UDP over arbitrary ports, with a C2 infrastructure that employs multiple layers of dead-drop resolvers and recursive proxying to obfuscate operator locations. Propagation occurs through lateral movement using stolen credentials and exploiting SMB vulnerability CVE-2017-0143 (EternalBlue) and Microsoft Exchange exploits like CVE-2021-26855 (ProxyLogon). Persistence is achieved via Windows services or scheduled tasks, with code injected into trusted system processes such as svchost.exe. Evasion techniques include fileless execution, custom encryption algorithms like AES-256-CBC with RC4 stream ciphers, and embedding within legitimate-looking files—often using steganography in JPEG images. MITRE ATT&CK IDs include T1105 (Ingress Tool Transfer), T1574.001 (DLL Side-Loading), and T1059.003 (Windows Command Shell).

📜 History & Notable Incidents

Snake was first publicly documented in 2014 but likely operational since 2010. In 2017, the malware was used in attacks against Ukrainian military systems and the German Foreign Office. A major campaign disclosed in 2023 by the U.S. Department of Justice (DOJ) revealed the FBI dismantled a Snake C2 network in a takedown operation named "Operation MEDUSA," seizing servers used by the FSB's Center 16 to control thousands of compromised hosts. No specific CVEs are associated with Snake itself, but it leverages CVE-2017-0143 and CVE-2021-26855 for delivery.

🔍 Detection Indicators

Known hashes include MD5: 0x1c8a8e7c1f3b2a9d4e5f6a7b8c9d0e1f (example) with actual SHA256 hashes documented by CISA advisories. Behavioral indicators include outbound connections to decoy websites (e.g., weather or news portals) used as dead drops, registry keys under HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionUninstall storing encoded configuration, and mutex names like "GlobalSnakeMutex_001". Network IOCs include TLS certificates with specific serial numbers and user-agent strings mimicking browser updates. CISA report AA23-095A provides detailed YARA rules.

☠️ Risk & Impact

Snake causes complete compromise of targeted systems, enabling persistent data exfiltration of classified documents, diplomatic communications, and military intelligence. The DOJ stated the FSB used Snake to steal sensitive information from NATO allies and Ukrainian government networks, leading to strategic intelligence losses. The affected sectors include national security, defense, and foreign affairs, with financial damages exceeding $100 million from remediation and intelligence losses.

🛡️ Mitigation

Mitigation includes applying patches for CVE-2017-0143 and CVE-2021-26855, implementing network segmentation, and using endpoint detection tools with YARA rules from CISA’s AA23-095A report. Organizations should enable application control, disable unnecessary SMBv1, and monitor for anomalous outbound SSL/TLS connections to decoy domains. The FBI’s takedown operation provides persistent blocking of known Snike IPs via threat intelligence feeds.

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