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Cephalus Ransomware Emerges as Go-Based Double

Cybersecuritynews •Tushar Subhra Dutta • February 11, 2026

Cephalus has surfaced as a Go-built ransomware strain linked to victim activity as early as June 2025, with wider public reporting appearing in August. It focuses on Windows networks and follows a double-extortion playbook, stealing sensitive data before it locks files. Victims can face operational downtime and pressure when attackers leak small “proof” sets to […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Cephalus Ransomware Targets Windows Networks with Double Extortion Cephalus is a Go-based ransomware strain that has been linked to victim activity since June 2025, with public awareness rising in August 2025. It employs a double-extortion tactic, stealing sensitive data before encrypting files, impacting operational continuity for affected organizations. Victims face threats of data leaks alongside operational downtime. 1 sources 33

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Cephalus Ransomware Emerges as Go-Based Double

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MITRE ATT&CK (2)

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