Cyber Serp, also identified as UAC-0255, is a cyber threat group that emerged in late 2025, known for conducting large-scale spear-phishing campaigns primarily targeting Ukrainian organizations. The group's primary motivation is assessed to be state-aligned cyber espionage and disruption, focusing on obtaining remote system control and stealing credentials. A distinguishing characteristic of Cyber Serp is its tactic of impersonating the Computer Emergency Response Team of Ukraine (CERT-UA) in its phishing operations and publicly claiming responsibility for its attacks via Telegram channels, often exaggerating the scale of its impact. Evidence suggests the group's origin is likely Russian, based on Russian-language elements observed on their command-and-control infrastructure.

Aliases del actor

UAC-0255

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