Threat Actor
Sergey Sergeyevich Zelenyuk
- First Reported
- Feb 25, 2026
- Latest Reported
- Feb 27, 2026
Reported Context (3)
- OFAC designated Zelenyuk over his role in Operation Zero. Treasury alleges the firm acquired and distributed cyber exploits and stolen U.S. government tools. U.S. Sanctions Operation Zero Over Sale of Stolen Government Cyber Tools
- The U.S. Treasury designated him alongside Matrix LLC; the Treasury said Zelenyuk and Operation Zero trade in exploits and offered rewards for exploits targeting U.S.-built software. US Sanctions Operation Zero Over Stolen Zero-Days as Ex-Executive Is Sentenced
- The Russian national, identified by authorities as Operation Zero’s director and owner, was sanctioned. Investigators say he attempted to expand operations by establishing Special Technology Services LLC FZ, partly to bypass financial restrictions. U.S. Sanctions Operation Zero Over Alleged Theft of Zero-Day Exploits
Malware (1)
People (1)
Threat Actors (5)
Vendors (1)
Industries (3)
Countries (5)
Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.