How BlueDelta (APT28) Targeted UKR.NET with Persistent Credential Harvesting (2024-2025)
Between June 2024 and April 2025, Russian state-sponsored threat group BlueDelta (APT28) orchestrated a persistent credential-harvesting campaign targeting users of UKR.NET, a leading Ukrainian webmail and news service. The threat actor employed convincing UKR.NET-lookalike login portals hosted on free services like Mocky, DNS EXIT, ngrok, and Serveo to steal usernames, passwords, and two-factor authentication codes. Phishing lures, primarily PDF attachments embedded with malicious links, were distributed to evade email scanning and sandboxing. Attackers continuously evolved their infrastructure—moving from compromised routers to anonymized tunneling platforms and adding new operational layers—reflecting increasing sophistication and resilience in support of GRU intelligence goals. This campaign exemplifies ongoing adaptations by nation-state actors to Western infrastructure takedowns and detection mechanisms, highlighting escalating risks to critical digital identities. Its advanced evasion techniques, modular infrastructure, and creative abuse of free online services signal a new phase in credential theft, underscoring the urgent need for organizations to reassess their defenses, particularly in the face of targeted phishing and lateral movement threats.
Kill Chain