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Snake was a long-running cyber-espionage implant developed and operated by a unit within Russia’s Federal Security Service (FSB) Center 16. Known earlier as Uroburos and associated in public reporting with the Turla toolset, it was built for covert intelligence collection. In May 2023, the FBI and partner agencies disrupted its peer-to-peer network through the court-authorized Operation MEDUSA.
What is Snake malware?
Snake was a sophisticated cyber-espionage platform—not a general-purpose virus aimed simply at disrupting computers. Its operators used it to maintain covert access to compromised systems and collect intelligence, including sensitive diplomatic and international-relations documents. The FBI-led joint advisory describes Snake as the FSB’s most sophisticated cyber-espionage tool.
Snake is also known as Uroburos. Public reporting commonly connects the operators and toolset to Turla, but that association does not mean Snake and every tool used by Turla are the same malware.
Who was behind Snake?
U.S. and partner agencies attributed Snake’s operation to a unit within Russia’s FSB Center 16. CISA reported that FSB officers based in Ryazan were associated with development and retooling, and that operations also originated from an FSB Center 16-occupied building in Moscow. Those details describe reported links to the activity; they do not establish that every Snake operation originated from those locations.
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CISA also reported that Snake code influenced later Turla-family tools, including Carbon, also called Cobra, and ComRAT.
How long was Snake active?
The FBI-led international advisory says the FSB began developing Snake under the name Uroburos in late 2003. In its May 2023 announcement of Operation MEDUSA, the U.S. Department of Justice described nearly 20 years of use. CISA said investigators had studied Snake-related tools for almost 20 years and noted that operators repeatedly revised the malware after public disclosures and mitigations.
| Date or period | What agencies reported |
|---|---|
| Late 2003 | The FSB began developing Snake as Uroburos, according to the FBI-led joint advisory. |
| 2003–2023 | CISA described almost 20 years of investigation into related tools and repeated operator changes to the malware. |
| May 9, 2023 | The NSA and partner agencies released a public advisory identifying Snake infrastructure in more than 50 countries. |
| May 9, 2023 | The Justice Department announced Operation MEDUSA, a court-authorized disruption of the global Snake network. |
How did Snake work?
Stealth, modularity, and multiple operating systems
Snake combined stealthy host components and network communications with a modular design that could accept new or replacement components. Investigators observed interoperable implants for Windows, macOS, and Linux. The advisory highlighted careful engineering that limited bugs, alongside the ability to adapt the platform over time.
From an exposed system into a wider network
Operators typically placed Snake on external-facing infrastructure, then used other tools and techniques to move deeper into internal networks. That approach let them use a compromised, internet-reachable system as a foothold for intelligence collection inside a victim’s environment. The implant’s stealth and communications design supported long-term access, rather than a single, noisy intrusion.
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NSA and partner agencies identified Snake infrastructure in more than 50 countries across North and South America, Europe, Africa, Asia, and Australia, including the United States and Russia. The Justice Department said the operation affected hundreds of computer systems. Those figures describe infrastructure and systems identified by authorities; they are not a count of every person or organization targeted.
Reported victim and target areas included government networks, research facilities, journalists, education, media, small businesses, and critical-infrastructure sectors. The operators’ mission was intelligence collection, including the theft of sensitive diplomatic and international-relations documents.
What did Operation MEDUSA do?
In May 2023, the FBI-led operation used court authorization to disrupt Snake’s peer-to-peer network and remove the implant from infected systems. DOJ announced the action on May 9, describing it as a disruption of the global network. The operation was designed to interfere with the operators’ ability to communicate with compromised systems and to clean infections within its authorized scope.
The disruption was a significant setback to Snake operations, but it should not be read as proof that every historical victim system was permanently clean, that no related tools remained, or that an organization could not be targeted again. Defenders should treat a suspected infection as an incident requiring investigation, not infer system status from the 2023 operation alone.
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How can defenders detect Snake?
The government’s joint advisory is the appropriate technical reference for indicators and detection guidance. The facts summarized here do not provide specific file hashes, network signatures, or commands, so no standalone signature or claim of current infection can be derived from them.
Quick Recap
- Use the official FBI-led joint advisory and CISA’s Snake materials to obtain their technical indicators and guidance, rather than relying on broad descriptions such as “unusual traffic” as proof of compromise.
- If Snake is suspected, involve your security or incident-response team promptly. Preserve relevant endpoint, network, authentication, and firewall records before routine retention or cleanup removes evidence.
- Assess exposed systems and investigate whether access extended into internal networks; the reported operator pattern involved using external-facing infrastructure as an entry point and then moving inward.
- Follow a documented containment and remediation process, including checks for persistence and unauthorized access. A tool removal alone does not establish that an environment is secure.
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