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221.10.21.25 has a threat confidence score of 51%. This IP address from China (AS4837, CHINA UNICOM China169 Backbone) has been observed in 11 honeypot sessions targeting SSH protocols. First observed on April 27, 2026, most recently active May 1, 2026.
Identifies SSH session activity where the attacker executes uname -s -m to retrieve the operating system name and machine architecture for host fingerprinting and payload targeting.