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171.39.37.77 has a threat confidence score of 80%. This IP address from China (AS4837, CHINA UNICOM China169 Backbone) has been observed in 10 honeypot sessions targeting RDP protocols. First observed on April 20, 2026, most recently active April 20, 2026.
Identifies RDP clients attempting authentication using Network Level Authentication (NLA) with the NTLM challenge-response protocol. This occurs during the CredSSP negotiation phase before a remote desktop session is established and indicates an active credential authentication attempt against the RDP service