Hackers Hid Vasilek Backdoor in VMware Tools During 2-Year Russian Healthcare Intrusion
Belarus-aligned hacktivist group Partisan Zmiy exploited supply chain to maintain persistent access

Key Takeaways
- Partisan Zmiy (Cyber Partisans), a Belarus-aligned hacktivist group, conducted a nearly two-year cyber espionage campaign against a Russian healthcare organization.
- The Vasilek backdoor was hidden in compromised VMware Tools installers, leveraging code-signing trust to maintain persistence.
- The intrusion began around October 2024 and was discovered in October 2026.
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