Ukrainian Hackers Ramp Up Brute-Force and Password-Spraying Attacks on VPN and RDP Systems

In mid-2025, a coalition of Ukraine-based autonomous systems orchestrated unprecedented brute-force and password-spraying campaigns against exposed SSL VPN and Remote Desktop Protocol (RDP) services, overwhelming security defenses and highlighting the growing sophistication of state-linked cyber-infrastructure. Over a concentrated three-day period in July 2025, the network operated under AS211736 (“FDN3”), allocated to FOP Dmytro Nedilskyi, unleashed […]

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