Ukrainian Network FDN3 Launches Massive Brute-Force Attacks on SSL VPN and RDP Devices

Ukrainian Network FDN3 Launches Massive Brute-Force Attacks on SSL VPN and RDP Devices

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Cybersecurity researchers have flagged a Ukrainian IP network for engaging in massive brute-force and password spraying campaigns targeting SSL VPN and RDP devices between June and July 2025.
The activity originated from a Ukraine-based autonomous system FDN3 (AS211736), per French cybersecurity company Intrinsec.
“We believe with a high level of confidence that FDN3 is part of a wider abusive

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